Typos in source code comments.

[m4.git] / ChangeLog

2008-09-01  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        Typos in source code comments.
        * modules/m4.c: Fix typos in comments.
        * m4/input.c: Likewise.
        * src/main.c: Likewise.

2008-08-29  Eric Blake  <ebb9@byu.net>

        Fix manual date information.
        * doc/m4.texinfo: UPDATED refers to the day the manual was built,
        not the release date of M4.
        Based on a bison patch by Akim Demaille.

2008-08-27  Eric Blake  <ebb9@byu.net>

        Tweak -d examples.
        * doc/m4.texinfo (Invoking m4): Fix example, since order of -d
        matters.
        (Dumpdef): Fix typo.

2008-08-23  Eric Blake  <ebb9@byu.net>

        Allow debugmode control over whether defn(undef) warns.
        * ltdl/m4/gnulib-cache.m4: Import verify module.
        * m4/m4module.h (M4_DEBUG_TRACE_DEREF, M4_DEBUG_TRACE_INITIAL):
        New values.
        (M4_DEBUG_TRACE_VERBOSE, M4_DEBUG_TRACE_DEFAULT): Adjust.
        * m4/m4.c (m4_create): Start with debugmode = d.
        * src/main.c (usage): Mention this.
        (main): Let -E impact debug mode.
        * m4/utility.c (m4_symbol_value_lookup): Squelch undefined warning
        if flag is clear.
        * modules/gnu.c (builtin, inder): Likewise.
        * m4/debug.c (m4_debug_decode): Parse new mode.
        * src/freeze.c (produce_debugmode_state): Accomodate new mode.
        * doc/m4.texinfo (Debugging options): Mention change in the
        default behavior.
        (Debugmode): Mention new flag d.
        (Operation modes): Mention interaction with -E.
        (Undefine, Defn, Pushdef, Indir, Builtin, Dumpdef): Document and
        test its effect.
        * tests/options.at (--debugmode): Update tests.
        * tests/freeze.at (reloading debugmode): Likewise.
        * NEWS: Document this.
        Reported by Ralf Wildenhues; without this patch, M4 1.6+ would be
        incompatible with Autoconf 2.62.

2008-08-22  Eric Blake  <ebb9@byu.net>

        Improve --debugmode behavior.
        * m4/m4module.h (m4_debug_decode): Simplify interface.
        * m4/debug.c (m4_debug_decode): Remove parameter, and handle
        setting the new value.
        * modules/gnu.c (debugmode): Adjust caller.
        * src/freeze.c (reload_frozen_state): Likewise.
        * src/main.c (main): Likewise.
        (usage): Fix default for --debug.
        * doc/m4.texinfo (Debugging options): Add an example.

2008-08-21  Eric Blake  <ebb9@byu.net>

        Avoid regression in defn(undef).
        * doc/m4.texinfo (Trace): Enhance test, to cover regression
        recently fixed on the branch.

2008-08-18  Eric Blake  <ebb9@byu.net>

        Remove deprecated -N option; fixes a regression from 2006-09-14.
        * src/main.c (DIVERSIONS_OPTION): Delete.
        (long_options, OPTSTRING, main): Remove -N/--diversions option.
        * doc/m4.texinfo (Limits control): Remove it from the manual.
        * NEWS: Mention that it is gone.
        * tests/options.at (deprecated options): Update test.

        Improve 'git diff' of manual source.
        * .gitattributes (*.texi*): Add diff attribute.
        * bootstrap: Tell git how to use it.
        Inspired by Jim Meyering's similar patch for coreutils.

2008-08-07  Bruno Haible  <bruno@clisp.org>  (tiny change)

        Run m4 tests prior to gnulib unit tests.
        * Makefile.am (SUBDIRS): Swap order of directories.

2008-08-03  Eric Blake  <ebb9@byu.net>

        Stage 26: Allow embedded NUL in macro definitions.
        Clean up final few locations that did not track macro definitions
        by length, to allow embedded NUL.  Make m4_arg_len callers aware
        of issue of flattening builtins when determining length.
        Memory impact: none.
        Speed impact: none noticed.
        * m4/m4module.h (m4_arg_len): Add parameter.
        (M4ARGLEN): Provide default for the parameter.
        * m4/m4private.h (includes): Share xmemdup0.h among all libm4
        files.
        * m4/macro.c (m4_arg_len): Fail if builtins are not flattened.
        * m4/syntax.c (includes): Rely on m4private.h for xmemdup0.
        * m4/symtab.c (includes): Likewise.
        (m4_symbol_value_copy): Use xmemdup0.
        * m4/module.c (install_macro_table): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * tests/freeze.at (reloading nul): Enhance test.
        * tests/null.m4: Likewise.
        * tests/null.err: Update expected output.
        * tests/null.out: Likewise.

        Fix regression in commenting unbalanced quotes, from 2008-02-16.
        * m4/m4private.h (m4__token_type): Add M4_TOKEN_COMMENT.
        * m4/input.c (m4__next_token, m4_print_token): Supply new token
        type for comments.
        * m4/macro.c (expand_token): Penalize comments, as they can
        contain unbalanced quotes; latent bug since 2007-12-07, exposed by
        passing $@ references built from comments.
        (expand_argument): Adjust caller.
        * tests/others.at (Comments): Enhance test to catch it.
        * NEWS: Mention the fix.

2008-07-30  Eric Blake  <ebb9@byu.net>

        Fix regression in trace output, introduced 2008-05-08.
        * m4/input.c (m4__push_symbol): When cloning chains, break pointer
        back to original chain; latent bug from 2008-02-02 that did not
        cause misbehavior until trace output read unfinished chain.
        * tests/builtins.at (debug): Add test for this.

2008-07-28  Eric Blake  <ebb9@byu.net>

        Optimize iteration examples.
        * examples/forloop2.m4: Avoid excess indir, by passing current
        counter value as parameter.
        * examples/foreachq3.m4: Avoid unneeded ifelse, by injecting an
        ignored argument.
        * doc/m4.texinfo (Improved forloop, Improved foreach): Update the
        documentation to match.

2008-07-26  Eric Blake  <ebb9@byu.net>

        Give example for O(n) foreach on m4 1.4.x.
        * examples/foreachq4.m4: New file.
        * Makefile.am (dist_pkgdata_DATA): Distribute it.
        * tests/others.at (recursion): Test it.
        * doc/m4.texinfo (Improved foreach): Document linear foreach with
        m4 1.4.5 and greater.

2008-07-19  Eric Blake  <ebb9@byu.net>

        Resynchronize docs from branch.
        * doc/m4.texinfo (Undefine, Pushdef): Mention warning on undefined
        name, particularly since the old documentation didn't match code.
        (Standard Modules): Add caveat about using __m4_version__.

2008-07-11  Eric Blake  <ebb9@byu.net>

        Bump required automake to 1.10a; regression introduced 2008-01-22.
        * configure.ac (AM_INIT_AUTOMAKE): Undo requirement downgrade to
        1.10.1, since we also rely on pkglibexecdir.
        * HACKING: Fix minimum requirement.
        * bootstrap: Likewise.
        * THANKS: Update.
        Reported by Joel E. Denny.

        Avoid bogus whitespace in @ovar, @dvar.
        * doc/m4.texinfo (ovar, dvar): Add @c.
        Based on patch by Ralf Wildenhues to Autoconf manual.

2008-06-23  Eric Blake  <ebb9@byu.net>

        Adjust to new gnulib-tool layout.
        * ltdl/m4/gnulib-cache.m4: Reformat.

        Fix bootstrap comment.
        * bootstrap: DOWNLOAD_PO was previously removed.

2008-06-19  Eric Blake  <ebb9@byu.net>

        Revert speed regression from 2008-06-16.
        * m4/output.c (m4_shipout_int): Avoid obstack_printf in hot path.
        * modules/m4.c (numb_obstack): Likewise.
        * m4/input.c (MATCH): Use fewer conditionals, and factor
        adjustment of S...
        (match_input): ...here for smaller code size.
        * m4/syntax.c (m4_reset_syntax, m4_set_quotes, m4_set_comment):
        Supply trailing NUL to delimiters, to meet contract of faster
        MATCH.

2008-06-18  Eric Blake  <ebb9@byu.net>

        Whitespace cleanup.
        * m4/m4module.h: Use consistent spacing for pointer parameters.
        * m4/m4private.h: Likewise.

        Stage 25b: Handle embedded NUL in changesyntax and friends.
        Track quote and comment delimiters by length, to allow embedded
        NUL.  Improve changesyntax to support assigning syntax to NUL.
        Memory impact: none.
        Speed impact: none noticed.
        * m4/m4module.h (m4_set_quotes, m4_set_comment, m4_set_syntax):
        Add parameter.
        (m4_reset_syntax): New prototype.
        * m4/syntax.c (add_syntax_set, subtract_syntax_set)
        (set_syntax_set, m4_set_quotes, m4_set_comment): Add parameter, to
        handle embedded NUL.
        (m4_set_syntax): Likewise.  Also, split code to reset the table...
        (m4_reset_syntax): ...into a new function.
        (m4_syntax_create): Adjust callers.
        * m4/input.c (match_input, MATCH): Add parameter.
        (m4__next_token, m4__next_token_is_open): Adjust callers.
        * modules/m4.h (m4_expand_ranges_func): Add parameter.
        * modules/m4.c (dumpdef): Handle NUL in dumped quotes.
        (changequote, changecom, translit, m4_expand_ranges): Track
        delimiter length.
        * modules/gnu.c (changesyntax): Handle embedded NUL.
        * src/freeze.c (reload_frozen_state): Adjust callers.
        * tests/freeze.at (reloading nul): Enhance test.
        * tests/null.m4: Likewise.
        * tests/null.out: Update expected output.
        * tests/null.err: Likewise.

2008-06-16  Eric Blake  <ebb9@byu.net>

        Stage 25a: Use obstack_printf for easier output.
        Convert macro tracing and other locations to use obstack_printf
        rather than hand-rolled equivalents.  Ensure that embedded NUL in
        trace output does not truncate the trace string.
        Memory impact: none.
        Speed impact: noticeable penalty, from obstack_printf overhead.
        * ltdl/m4/gnulib-cache.m4: Import obstack-printf-posix module.
        * m4/macro.c (trace_format): Delete; use obstack_printf instead.
        (trace_header, trace_pre, trace_post): All callers updated.
        * m4/output.c (m4_shipout_int, m4_tmpname): Use obstack_printf.
        (m4_divert_text): Speed up syncline output.
        * modules/m4.c (dumpdef): Handle embedded NUL.
        (numb_obstack): Speed up eval output.
        (maketemp): Use obstack_printf.
        * modules/format.c (format): Likewise.

        Add missing const qualifications.
        * m4/resyntax.c (m4_resyntax_map): Declare array elements as
        const.
        * modules/gnu.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/import.c (m4_builtin_table): Likewise.
        * modules/load.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/m4.c (m4_builtin_table): Likewise.
        * modules/modtest.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/mpeval.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/perl.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/shadow.c (m4_builtin_table, m4_macro_table): Likewise.
        * modules/stdlib.c (m4_builtin_table): Likewise.
        * modules/time.c (m4_builtin_table): Likewise.
        * modules/traditional.c (m4_macro_table): Likewise.

2008-06-10  Eric Blake  <ebb9@byu.net>

        Avoid corrupted frozen file if NUL appears on block boundary.
        * m4/output.c (insert_file): Separate consecutive quotearg blocks
        with \<newline>, in case last byte of first block was NUL.

2008-06-03  Eric Blake  <ebb9@byu.net>

        Fix printf type mismatches.
        * m4/m4module.h (m4_bad_argc): Alter parameter type.
        * m4/m4private.h (struct m4_call_info): Alter call_id type.
        * m4/macro.c (expand_macro, m4__adjust_refcount): Use correct
        specifiers.
        * m4/utility.c (m4_bad_argc): Likewise.

        Borrow bootstrap ideas from gnulib.
        * bootstrap (options, DOWNLOAD_PO): Remove --download-po; the
        advertized subset of languages didn't work.  Use --skip-po
        instead, for consistency with gnulib bootstrap.
        (func_get_translations): Use rsync, not wget.
        (func_update_po): Use a reference directory, to avoid changing
        timestamps on unchanged .po files.
        * TODO: Update accordingly.

        Fix fallout from previous patch.
        * doc/m4.texinfo (Builtin): Adjust expected output.

2008-06-02  Eric Blake  <ebb9@byu.net>

        Stage 24c: Improve display of macro names with embedded NUL.
        Quote instances of problematic characters in macro names when
        presented to user.  Track location via call_info rather than
        munging context for every expansion.
        Memory impact: none.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/m4module.h (m4_push_string_init): Add parameters.
        * m4/m4private.h (struct m4_macro_args): Remove argv0 and
        argv0_len, now redundant with info.
        (m4__push_wrapup_init): Add parameter.
        * m4/input.c (m4_push_string_init, m4__push_wrapup_init): Track
        location from caller, rather than context.
        (composite_peek, composite_read, match_input): Adjust callers.
        * m4/utility.c (m4_symbol_value_lookup): Quote macro name.
        (m4_verror_at_line): Allow NUL in macro name.
        * m4/macro.c (trace_flush, m4_trace_prepare, trace_pre): Allow NUL
        in trace.
        (expand_macro): No longer munge context location.
        (collect_arguments, m4_arg_text, m4_arg_empty, m4_arg_len)
        (m4_make_argv_ref, m4_push_arg, m4_wrap_args): Adjust callers.
        * modules/gnu.c (builtin, indir): Likewise.
        * tests/null.m4: Enhance test.
        * tests/null.err: Adjust expected output.
        * tests/null.out: Likewise.

        Stage 24b: Allow embedded NUL in macro names.
        Use length rather than NUL-termination when tracking macro names.
        All APIs dealing with symbol table changed.
        Memory impact: none.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/m4module.h (m4_symtab_apply_func, m4_symbol_lookup)
        (m4_symbol_pushdef, m4_symbol_define, m4_symbol_popdef)
        (m4_symbol_rename, m4_symbol_delete): Add length parameter.
        (m4_string): New type.
        * ltdl/m4/gnulib-cache.m4: Import xmemdup0 module.
        * m4/hash.c (m4_hash_string_hash, m4_hash_string_cmp): Account for
        length.
        * m4/symtab.c (m4_symtab_delete, m4_symtab_apply, symtab_fetch)
        (m4__symtab_remove_module_references, symbol_destroy_CB)
        (m4_symbol_lookup, m4_symbol_pushdef, m4_symbol_define)
        (m4_symbol_popdef, m4_symbol_rename, m4_set_symbol_name_traced)
        (m4_symbol_delete): Likewise.
        * modules/m4.h (struct m4_dump_symbol_data): Adjust type to allow
        passing length.
        * m4/macro.c (expand_token): Adjust all callers.
        * m4/module.c (install_builtin_table, install_macro_table):
        Likewise.
        * m4/utility.c (m4_symbol_value_lookup): Likewise.
        * modules/gnu.c (indir, renamesyms, m4symbols): Likewise.
        * modules/m4.c (define, undefine, pushdef, popdef)
        (dumpdef_cmp_CB, dump_symbol_CB, m4_dump_symbols, dumpdef)
        (traceon, traceoff): Likewise.
        * src/main.c (main): Likewise.
        * src/freeze.c (dump_symbol_CB, reload_frozen_state): Likewise.
        * tests/freeze.at (reloading nul): Augment test.
        * tests/null.out: Adjust expected output.

        Stage 24a: Use full call context in error reporting.
        Replace const char *macro_name with const m4_call_info *call, so
        that the next patch can pass the length of macro_name with
        embedded NUL.  Simplifies handling of global state.
        Memory impact: none.
        Speed impact: none noticed.
        * m4/m4module.h (m4_error, m4_warn): Change parameter type.
        (m4_error_at_line, m4_warn_at_line): Delete.
        (m4_debug_set_output, m4_skip_line, m4_bad_argc, m4_numeric_arg)
        (m4_parse_truth_arg, m4_symbol_value_lookup): Adjust all clients.
        * m4/m4private.h (m4__next_token): Likewise.
        * m4/utility.c (m4_verror_at_line): Alter parameter, and use
        caller's location if caller is provided.
        (m4_error, m4_warn): Change parameter type.
        (m4_error_at_line, m4_warn_at_line): Delete.
        (m4_bad_argc, m4_numeric_arg, m4_parse_truth_arg)
        (m4_symbol_value_lookup): Adjust all callers.
        * m4/debug.c (set_debug_file, m4_debug_set_output): Likewise.
        * m4/input.c (m4_skip_line, m4__next_token): Likewise.
        * m4/macro.c (expand_argument, collect_arguments, m4_macro_call)
        (process_macro): Likewise.
        * modules/m4.h (m4_make_temp_func): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.
        * modules/format.c (arg_int, arg_long, arg_double, format):
        Likewise.
        * modules/gnu.c (builtin, changeresyntax, changesyntax, debugfile)
        (debuglen, debugmode, esyscmd, indir, mkdtemp, patsubst, regexp)
        (renamesyms, syncoutput, regexp_compile, substitute)
        (regexp_substitute, m4_resyntax_encode_safe): Likewise.
        * modules/m4.c (define, undefine, pushdef, popdef, ifdef, ifelse)
        (m4_dump_symbols, defn, syscmd, incr, decr, divert, undivert, dnl)
        (include, maketemp, mkstemp, m4exit, traceon, traceoff, substr):
        Likewise.
        * modules/stdlib.c (setenv, getpwuid, srand): Likewise.
        * modules/time.c (ctime, gmtime, localtime, mktime, strftime):
        Likewise.
        * tests/options.at (--syncoutput): Add test for invalid
        command-line argument.  Split xfailed portion...
        (--syncoutput and diversions): ...into new test.
        (unknown option): New test.
        * tests/freeze.at (reloading unknown builtin): Update expected
        output.

        Adjust to recent gnulib change.
        * configure.ac (AB_INIT): Delete, now that gnulib does this.

2008-05-28  Eric Blake  <ebb9@byu.net>

        Improve frozen debugmode behavior.
        * m4/debug.c (m4_debug_decode): Make empty debugmode additive.
        * src/main.c (main): Interleave -d with files.
        * tests/options.at (--debugmode): Update test.
        * tests/freeze.at (reloading debugmode): New test.
        * doc/m4.texinfo (Debugging options, Debugmode): Document the
        change.
        * NEWS: Likewise.

2008-05-27  Eric Blake  <ebb9@byu.net>

        Fix some testsuite failures on Solaris 8.
        * tests/builtins.at (esyscmd, syscmd): Skip tests if system(2) is
        broken.
        * tests/others.at (stderr closed): Likewise.  Also support Solaris
        wording for EBADF.
        (stdin closed): Skip test if closed stdin gets reopened.
        (stdout closed): Support Solaris wording for EBADF.
        * tests/testsuite.at (AT_CHECK_M4): Likewise.

        Fix configure message nesting, broken since 2001-09-20.
        * ltdl/m4/gmp.m4 (M4_LIB_GMP): Don't cache result; the test is
        not expensive, and AC_MSG_WARN doesn't work in AC_CACHE_CHECK.

        Support 'make dist' with BSD make.
        * Makefile.am (TESTSUITE_AT, MAINTAINERCLEANFILES): Qualify uses
        of the generated file tests/generated.at.
        (EXTRA_DIST, $(TESTSUITE)): Likewise for tests/package.m4.
        * tests/others.at (stdout closed): Accomodate OpenBSD /bin/sh.

2008-05-24  Eric Blake  <ebb9@byu.net>

        Test NUL in frozen files.
        * tests/testsuite.at (AT_CHECK_M4): Add parameter.
        * tests/freeze.at (reloading nul): New test.
        (AT_TEST_FREEZE): Inhibit -d when reloading frozen file.
        (reloading unknown builtin): Likewise.

2008-05-23  Eric Blake  <ebb9@byu.net>

        Improve handling of frozen file errors.
        * src/freeze.c (produce_frozen_state): Detect write failures.
        (reload_frozen_state): Use close_stream.
        * tests/freeze.at (freezing failure): New test.
        * THANKS: Update.
        Reported by Jean-Charles Longuet.

2008-05-19  Eric Blake  <ebb9@byu.net>

        In frozen file, split consecutive strings with newline.
        * src/freeze.c (dump_symbol_CB): Add newline to 'T', 'F'.
        (produce_frozen_state): Likewise for 'Q', 'C'.
        (reload_frozen_state): Parse the new layout.
        [GET_DIRECTIVE]: Fix format 1 regression from 2008-05-13.
        * tests/freeze.at (loading format 2): Rewrite to new format.
        (reloading unknown builtin): Likewise.
        (loading format 1): Make sure backslash-newline is not
        interpreted.
        * doc/m4.texinfo (Frozen file format 2): Document the format.
        * NEWS: Document this change.

        Fix xgettext options.
        * po/Makevars (XGETTEXT_OPTIONS): The " must be passed to
        xgettext.

        Fix spelling of René Seindal's name in --version output.
        * ltdl/m4/gnulib-cache.m4: Import propername module.
        * src/main.c (AUTHORS): Rewrite in terms of proper_name.
        * po/Makevars (XGETTEXT_OPTIONS): Detect new functions.
        * HACKING: Mention new prerequisite of gperf.

2008-05-18  Eric Blake  <ebb9@byu.net>

        Allow freezing the trace status of macros.
        * src/freeze.c (produce_symbol_dump): Let undefined traced macros
        through.
        (dump_symbol_CB): Also freeze trace state.
        * tests/freeze.at (reloading traced macros): New test.
        * doc/m4.texinfo (Using frozen files): Update documentation to
        mention new state.
        (Frozen file format 1): Improve synchronization with branch.
        (Frozen file format 2): Reorder directives, and add `d', `t'.
        * NEWS: Document this change.

2008-05-15  Eric Blake  <ebb9@byu.net>

        Fix frozen file regression in pushdef stacks from 2001-09-01.
        * src/freeze.c (dump_symbol_CB): Push all values on the stack, not
        just the current definition.
        (reverse_symbol_value_stack): New helper method.
        * tests/freeze.at (AT_TEST_FREEZE): New helper macro.
        (reloading pushdef stack): New test.
        (reloading unknown builtin): Enhance test.

2008-05-13  Eric Blake  <ebb9@byu.net>

        Fix frozen file regression in diversions from 2007-01-21.
        * m4/output.c (insert_diversion_helper): Add parameter.
        (m4_insert_file): Move contents...
        (insert_file): ...to this new helper, with added parameter.
        (m4_insert_diversion, m4_undivert_all, m4_freeze_diversions):
        Update callers.
        * src/freeze.c (produce_mem_dump): Simplify.
        * tests/freeze.at (large diversion): Test for this.

        Improve error message when frozen file is invalid.
        * src/freeze.c (decode_char): Add parameter.  Allow \<newline>
        line continuations.
        (reload_frozen_state): Track current line.
        * tests/freeze.at (loading format 1, loading format 2): Update to
        test this.

2008-05-10  Eric Blake  <ebb9@byu.net>

        Detect integer overflow when loading frozen file.
        * src/freeze.c (reload_frozen_state) [GET_NUMBER]: Rewrite to fail
        immediately on overflow.
        * tests/freeze.at (loading format 2): Test this.
        Reported by Jim Meyering.

2008-05-08  Eric Blake  <ebb9@byu.net>

        Stage 23: allow tracing of indirect macro calls.
        Track all trace information as part of the argv struct, rather
        than temporarily resetting global state.  Teach indir to trace
        macros that it invokes.
        Memory impact: slight penalty, due to larger argv struct.
        Speed impact: none noticed.
        * m4/m4module.h (m4_input_block): Remove.
        (m4_call_info): New opaque type.
        (m4_trace_prepare, m4_arg_info): New prototypes.
        (m4_macro_call, m4_push_string_finish, m4_input_print): Change
        prototypes.
        * m4/m4private.h (struct m4_macro_args): Add info field.
        (struct m4_call_info): New structure.
        (m4_arg_info): New accessor.
        * m4/input.c (m4_input_block): Make typedef local.
        (m4_push_string_init): Initialize length.
        (m4_push_string_finish, m4_input_print): Change signature, so that
        printing can be done before finalization.
        (struct input_funcs): Add parameter to print_func.
        (file_print, string_print, composite_print): Adjust accordingly.
        * m4/macro.c (trace_header, trace_flush, trace_pre, trace_post):
        Change signatures for stacked trace messages, and for using call
        context.
        (trace_prepre): Export and rename...
        (m4_trace_prepare): ...to this, for use by indir.  Alter signature
        to use call context.
        (collect_arguments): Alter signature, to manage new field.
        (expand_macro): Change call context management.  Move tracing...
        (m4_macro_call): ...here.  Remove redundant parameter.
        (m4_arg_argc): New function.
        (m4_make_argv_ref): Replace unused skip parameter with new trace
        parameter; manage new field.
        * modules/gnu.c (builtin, indir): Adjust callers.
        * src/main.c (usage): Update debugmode flag summary.
        * tests/null.m4: Enhance test.
        * tests/null.err: Update expected output.
        * tests/macros.at (Tracing Hanoi Towers): Likewise.
        * doc/m4.texinfo (Trace): Mention more about trace formatting.
        (Debugmode): Enhance description of 'c' and 'x'.  Enhance test to
        cover line numbering details in traces.
        (Debuglen): Enhance test to cover indir tracing.
        * NEWS: Mention these changes.
        Reported by Akim Demaille in the autoconf TODO file in 2000.

2008-05-07  Eric Blake  <ebb9@byu.net>

        Test for traceon regression just fixed in branch-1.6.
        * doc/m4.texinfo (Trace): Enhance test.
        * NEWS: Port news item from branch.

2008-05-05  Eric Blake  <ebb9@byu.net>

        Stage 22: allow builtin token concatenation outside $@.
        Adjust the input and argument parsing engines to append builtins
        alongside text.  Make define warn when builtins must be
        flattened.
        Memory impact: slight penalty, with fewer builtins flattened.
        Speed impact: slight penalty, from more bookkeeping.
        * m4/m4module.h (m4_is_arg_composite): New prototype.
        (m4_symbol_value_copy): Change return type.
        (m4_arg_text): Add parameter.
        (M4ARG): Adjust callers.
        * m4/m4private.h: Adjust comments.
        * m4/symtab.c (m4_symbol_value_copy): Detect when builtins are
        flattened.
        * m4/input.c (init_builtin_token): Add parameter, and allow
        concatenating builtins.
        (m4__next_token): Adjust caller.
        * m4/macro.c (m4_is_arg_composite): New function.
        (expand_argument): Allow builtin concatenation.
        (m4_arg_text): Add parameter.
        (m4__arg_adjust_refcount, m4__arg_print): Adjust callers.
        (m4_arg_equal): Fix comparison of builtin tokens.
        * modules/m4.c (define, pushdef): Warn when flattening builtins.
        * doc/m4.texinfo (Define): Remove dead comment.
        (Defn): Update to reflect code changes.
        * tests/builtins.at (defn): Remove xfail.
        * NEWS: Document this change.

2008-05-03  Eric Blake  <ebb9@byu.net>

        Document define_blind.
        * doc/m4.texinfo (Ifelse): Add a new composite macro.
        * THANKS: Update.
        Suggested by Mike R.

2008-05-01  Eric Blake  <ebb9@byu.net>

        Avoid -Wshadow compiler warnings.
        * m4/output.c (threshold_diversion_CB): s/div/diversion/.
        * m4/macro.c (make_argv_ref, arg_symbol, m4_arg_symbol)
        (m4_is_arg_text, m4_is_arg_func, m4_arg_text, m4_arg_empty)
        (m4_arg_len, m4_arg_func, m4__arg_print, m4_make_argv_ref)
        (m4_push_arg, m4__push_arg_quote): s/index/arg/.
        * modules/format.c (format): Likewise.
        * modules/m4.c (ifelse): Likewise.

        Improve debugmode testing, based on recent branch-1.6 regressions.
        * doc/m4.texinfo (Debugmode): Enhance tests.
        * tests/generate.awk: Run tests from stdin, not input.m4.  Support
        stderr munging when using -I examples.

        Fix regression in define from 2008-02-22.
        * m4/m4module.h (m4_symbol_value_copy): Add parameter.
        * m4/symtab.c (m4_symbol_value_copy): Support copying $@
        back-references.
        * m4/macro.c (expand_argument): Update callers.
        * modules/m4.c (define, pushdef): Likewise.
        * tests/builtins.at (define): Enhance test to catch this.

2008-04-21  Eric Blake  <ebb9@byu.net>

        Simplify previous patch.
        * tests/m4.in: Compress assignment.
        Suggested by Gary V. Vaughan.

        Fix --disable-shared testsuite regression from previous patch.
        * tests/m4.in: Export M4MODPATH, so that recursive m4 invocations
        will also work.

        Fix spelling of attribution to Christopher Strachey.
        * doc/m4.texinfo (History, Inhibiting Invocation): Fix typo.
        * THANKS: Update.
        Reported by Fernando Carrijo.

2008-04-17  Eric Blake  <ebb9@byu.net>

        Fix testsuite bug when SIGPIPE is ignored.
        * tests/builtins.at (divert): Consume all of m4's output, to avoid
        spurious write failure.
        * src/main.c (main): In batch mode, restore default handling of
        SIGPIPE.
        * doc/m4.texinfo (Operation modes): Document SIGPIPE behavior.
        * THANKS: Update.
        Reported by Bob Proulx, via his autobuilder.

2008-04-15  Eric Blake  <ebb9@byu.net>

        Fix 'make installcheck' after './configure --prefix-progname'.
        * tests/testsuite.at (AT_CHECK_M4): Allow overriding the m4
        program name.
        (HELP_OTHER, PREPARE_TESTS): Document and use $M4.
        * tests/builtins.at (patsubst): Avoid space-tab.
        (divert, mkdtemp, mkstemp): Adjust tests to use $M4.
        * tests/options.at (--debugfile): Likewise.
        * tests/others.at (stdin seekable): Likewise.
        (fstab): Avoid space-tab.
        * Makefile.am (installcheck-local): Accomodate transformed name.
        (DISTCHECK_CONFIGURE_FLAGS): Ensure no regressions, by using gm4
        during 'make distcheck'.
        * cfg.mk: New file, borrowed from branch.

        Update prerequisite tools to match recent releases.
        * configure.ac (AC_PREREQ): Rely on released autoconf.
        (LT_PREREQ): Rely on released libtool.
        * tests/testsuite.at (m4_version_prereq): Update dependence.
        * bootstrap: Mention prerequisites.

        Work around OS/2 limitation of printf(1).
        * tests/null.m4: Use m4, not printf, to generate NUL byte.
        * tests/null.out: Check for esyscmd failure.
        Reported by Elbert Pol.

2008-04-14  Eric Blake  <ebb9@byu.net>

        Stage 21b: $@ concatenates builtins, m4wrap takes builtins.
        Improve arg_print to handle builtin tokens when printing to a
        known chain, rather than always flattening builtins.  This allows
        m4wrap and $@ back-references to handle embedded builtin tokens.
        Memory impact: none.
        Speed impact: slight penalty, from more bookkeeping.
        * m4/m4module.h (m4_push_builtin): Add parameter.
        (m4_builtin_print, m4_push_wrapup_init, m4_push_wrapup_finish)
        (m4_arg_print, m4_symbol_value_print): Rename and reduce scope...
        * m4/m4private.h (m4__builtin_print, m4__push_wrapup_init)
        (m4__push_wrapup_finish, m4__arg_print, m4__symbol_value_print):
        ...to these, in some cases adding a parameter.
        (m4__append_builtin): New prototype.
        * m4/builtin.c (m4_builtin_print): Alter signature to print
        builtin to a growing symbol chain.
        * m4/symtab.c (m4__symbol_value_print): Alter signature.
        (m4_symbol_print, dump_symbol_CB): Adjust callers.
        * m4/input.c (builtin_peek, builtin_read, builtin_unget)
        (builtin_print, builtin_funcs): Delete, handled via composite
        blocks now.
        (struct m4_input_block): Delete u.builtin member.
        (init_builtin_token): Only use composite block.
        (m4__append_builtin): New function.
        (m4_push_builtin, m4__push_wrapup_init): Alter signature.
        (m4__push_symbol): Allow builtin tokens.
        (m4__push_wrapup_finish): Rename.
        (composite_print, m4_print_token): Adjust callers.
        * m4/macro.c (m4_wrap_args, collect_arguments): Allow builtin
        tokens.
        (m4__arg_print): Alter signature.
        (trace_prepre, trace_pre, m4_arg_text, m4_arg_equal): Adjust
        callers.
        * modules/m4.c (m4wrap): Allow builtin tokens.
        (defn, errprint): Adjust callers.
        * modules/gnu.c (builtin): Likewise.
        * doc/m4.texinfo (M4wrap): New test.
        (Debuglen): Adjust expected output.

        Stage 21a: Optimize checks for end of input.
        Create a new polymorphic input block type, which always fails with
        CHAR_EOF, so that remaining input routines no longer have to check
        for NULL input block.
        Memory impact: none.
        Speed impact: noticeable improvement, from fewer conditionals.
        * m4/input.c (eof_funcs, input_eof): New objects.
        (eof_peek, eof_read, eof_unget): New functions.
        (file_clean, m4_push_string_init, pop_input, m4_push_wrapup_init)
        (m4_pop_wrapup, next_char, peek_char, unget_input, m4_input_init)
        (m4_input_exit): Use placeholder to guarantee non-NULL isp and
        wsp.
        (next_char): Rename retry to allow_unget, and change sense for
        easier manipulation.  All callers changed.

        Improve OS/2 detection.
        * modules/gnu.c (m4_macro_table): Ensure all possible identifiers
        are defined, not just the first.  The testsuite ensures that
        exactly one gets defined.
        * m4/system_.h [__EMX__]: OS/2 is not Unix-compatible, no matter
        what other pre-defined macros it has.
        * THANKS: Update.
        Reported by Elbert Pol.

        Ensure __m4_version__ is unquoted.
        * tests/builtins.at (__m4_@&t@version__): Augment test.

        Avoid GNU make failure on tarball.
        * Makefile.am (EXTRA_DIST): Distribute cfg.mk and maint.mk.

2008-04-10  Eric Blake  <ebb9@byu.net>

        Allow back-referenced macro names; fixes 2008-03-13 regression.
        * m4/m4module.h (m4_symbol_value_lookup): Change prototype.
        * m4/utility.c (m4_symbol_value_lookup): Change signature.
        * modules/m4.c (undefine, popdef, ifdef, m4_dump_symbols, defn):
        Adjust all callers.
        * tests/others.at (ifndef): New test.

        Be namespace clean for M4 version; fixes 2008-04-08 regression.
        * configure.ac (version): Rename...
        (M4_VERSION): ...to this, since using 'version' broke po.m4.

2008-04-09  Eric Blake  <ebb9@byu.net>

        Mention 1.4.11 release.
        * doc/m4.texinfo (History, Defn, Ifdef, Ifelse, M4wrap)
        (Extensions, Improved foreach): Distinguish 1.4.11 and 1.6.
        (Format): Add test of C99 hex-float parsing.
        * NEWS: Mention 1.4.11 release.
        * tests/builtins.at (divert): Add additional test.

2008-04-08  Eric Blake  <ebb9@byu.net>

        Overhaul inter-version releases to work with git.
        * configure.ac (version): New variable, which has nicer version
        contents when using git 1.5.5+, hardcoded to 1.9a otherwise.
        (TIMESTAMP): Delete, since CVS id expansion died with transition
        to git.
        (AM_INIT_AUTOMAKE): Use version to decide gnu vs. gnits.
        * build-aux/mkstamp: Delete, no longer used.
        * Makefile.am (CONFIG_STATUS_DEPENDENCIES): Kill, to speed up
        rebuilds when timestamps don't matter.
        (MKSTAMP): Delete, no longer used.
        (EXTRA_DIST): No longer worry about mkstamp.
        (.version): New rule and distributed file.
        (doc/m4.1, tests/package.m4): Depend on .version, not
        configure.ac, for timestamp.
        * ltdl/m4/gnulib-cache.m4: Import git-version-gen module.
        * modules/gnu.c (__m4_version__): TIMESTAMP no longer exists.
        * src/main.c (main): Likewise.

2008-03-28  Eric Blake  <ebb9@byu.net>

        Use GNUmakefile module.
        * ltdl/m4/gnulib-cache.m4: Import gnumakefile module.
        * Makefile.am: Split off maintainer rules...
        * maint.mk: ...into this new file.

2008-03-18  Eric Blake  <ebb9@byu.net>

        Stage 20b: make m4wrap obey POSIX fifo ordering.
        Improve input engine to support location changes within symbol
        chains, then convert m4wrap to always build symbol chain.
        Memory impact: none.
        Speed impact: slight penalty, from more m4wrap bookkeeping.
        * m4/m4module.h (m4_wrap_args): Add prototype.
        * m4/m4private.h (enum m4__symbol_chain_type): Add M4__CHAIN_LOC.
        (struct m4__symbol_chain): Add struct u_l.
        * m4/input.c (m4_push_wrapup_init, m4_push_wrapup_finish): Use
        new link type.
        (composite_peek, composite_read, composite_clean): Handle location
        link.
        * m4/macro.c (m4_wrap_args): New function.
        * modules/m4.c (m4wrap): Use it.
        * doc/m4.texinfo (M4wrap): Sync with branch and POSIX.
        (Extensions): Document extension of multiple arguments.
        (Location, Improved m4wrap): Adjust example to match FIFO order.
        * tests/builtins.at (wrap): Likewise.
        * NEWS: Document this change.

2008-03-17  Eric Blake  <ebb9@byu.net>

        Stage 20a: reduce unget's in input engine.
        Now that out-of-range input placeholders like CHAR_BUILTIN are
        consumed outside of next_char, next_token should always consume
        rather than peek at the first character.  Fewer peeks results in
        less ungetc overhead.
        Memory impact: none.
        Speed impact: noticeable improvement, from fewer function calls.
        * m4/input.c (struct input_funcs): Alter read_func prototype.
        (next_char, file_read, buildin_read, string_read, composite_read):
        Add allow_argv parameter.
        (init_builtin_token, init_argv_symbol): Require all prior input to
        be consumed.
        (m4_skip_line, match_input, consume_syntax): Adjust callers.
        (m4__next_token): Consume first byte without peek.

        Update for fresh bootstrap.
        * ltdl/m4/gnulib-cache.m4: Updated copyright from upstream.

2008-03-15  Eric Blake  <ebb9@byu.net>

        Document join, in order to fix bug in m4wrap example.
        * examples/join.m4: New file.
        * examples/wraplifo2.m4: Likewise.
        * Makefile.am (EXTRA_DIST): Add new files.
        * doc/m4.texinfo (Improved m4wrap): New node.
        (Defn, Location): Enhance tests.
        (Shift): Document the composite macro join.
        (Incompatibilities): Move documentation of LIFO vs. FIFO...
        (M4wrap): ...here, to match improved example.

2008-03-13  Eric Blake  <ebb9@byu.net>

        Stage 19c: allow builtin tokens in more macros.
        Allow builtin tokens inside symbol chains, although for now, they
        are not allowed inside comments or quotes.  Enable builtin token
        handling in more macros, if only to consistently diagnose invalid
        macro names.
        Memory impact: none.
        Speed impact: slight impact, due to more bookkeeping.
        * m4/m4module.h (m4_symbol_value_lookup, m4_builtin_print): New
        prototypes.
        * m4/m4private.h (enum m4__symbol_chain_type): Add
        M4__CHAIN_FUNC.
        (struct m4__symbol_chain): Add builtin member.
        * m4/utility.c (m4_symbol_value_lookup): New method.
        * m4/builtin.c (m4_builtin_print): New function.
        * m4/symtab.c (m4_symbol_value_print): Use it.
        * m4/input.c (builtin_print): Likewise.
        (m4__push_symbol): Allow pushing builtin tokens.
        (composite_peek, composite_read, composite_unget, composite_clean)
        (composite_print): Handle builtin tokens.
        (init_builtin_token): Allow builtin tokens from composite input.
        (m4__next_token): Flatten builtins inside comment or string.
        * m4/macro.c (expand_argument): Strengthen assertion.
        (collect_arguments, m4_arg_equal, m4_arg_print, m4_push_args):
        Handle builtin tokens.
        (arg_symbol): Add parameter, and allow NULL level.
        (m4_arg_symbol, m4__push_arg_quote): Adjust callers.
        (m4_arg_text): Ensure all builtins have been flattened.
        * modules/m4.c (defn, dumpdef, popdef, traceoff, traceon)
        (undefine, m4_dump_symbols): Warn on invalid macro names.
        (ifdef, ifelse, shift): Handle builtin tokens.
        * modules/gnu.c (m4symbols): Likewise.
        * doc/m4.texinfo (Defn, Ifdef, Ifelse): Document and test the new
        behavior.
        (Debuglen): Likewise, and remove xfail.
        * NEWS: Mention the change.

        Stage 19b: invert sense of bit for handling builtin tokens.
        Pass builtin tokens by default, rather than as the exception, so
        that the logic can consistently refer to flattening arguments.
        Memory impact: none.
        Speed impact: none.
        * m4/m4module.h (M4BUILTIN_ENTRY): New convenience macro.
        (M4_BUILTIN_GROKS_MACRO): Rename...
        (M4_BUILTIN_FLATTEN_ARGS): ...and invert sense.
        (m4_symbol_value_groks_macro, m4_symbol_groks_macro): Likewise...
        (m4_symbol_value_flatten_args, m4_symbol_flatten_args): ...to
        this.
        * m4/m4private.h (VALUE_MACRO_ARGS_BIT)
        (m4_symbol_value_groks_macro): Likewise...
        (VALUE_FLATTEN_ARGS_BIT, m4_symbol_value_flatten_args): ...to
        this.
        * m4/symtab.c (m4_symbol_value_groks_macro): Likewise...
        (m4_symbol_value_flatten_args): ...to this.
        * m4/macro.c (collect_arguments): Accomodate changed sense.
        * m4/module.c (m4__module_open): Require arguments if flattening
        is requested.
        * m4/input.c (m4_push_string_finish): For now, flatten all
        builtins pushed as back-references.
        * modules/gnu.c (m4_builtin_table, builtin): Adjust all clients.
        * modules/import.c (m4_builtin_table): Likewise.
        * modules/load.c (m4_builtin_table): Likewise.
        * modules/modtest.c (m4_builtin_table): Likewise.
        * modules/mpeval.c (m4_builtin_table): Likewise.
        * modules/perl.c (m4_builtin_table): Likewise.
        * modules/shadow.c (m4_builtin_table): Likewise.
        * modules/stdlib.c (m4_builtin_table): Likewise.
        * modules/time.c (m4_builtin_table): Likewise.
        * modules/m4.c (m4_builtin_table): Likewise.
        (mkstemp): Undo #undef hack from 2006-10-23, now that macro names
        are stringized without preprocessor expansion.
        * doc/m4.texinfo (Defn): Update comments to match reality.
        (Debuglen): Update test now that user macros pass builtin tokens.

        Stage 19a: sort and cache builtins loaded by a module.
        Rather than repeatedly using dlsym to browse the builtin table,
        copy off the table at module load time.  Then, the input engine
        merely refers to the copy instead of duplicating information.
        Memory impact: slight penalty, due to more memory per module, but
        offset by less memory in input engine.
        Speed impact: slight improvement, due to faster builtin lookups.
        * m4/m4module.h (m4_set_symbol_value_builtin): Delete.  Use
        m4_builtin_find_by_* instead.
        (m4_builtin_find_by_func): Change return type.
        * m4/m4private.h (m4__builtin): New struct.
        (m4_module): Add sorted list of loaded builtins.
        (struct m4_symbol_value): Change type of builtin value.
        (m4__set_symbol_value_builtin): New prototype and fast accessor.
        (m4_get_symbol_value_func, m4_get_symbol_value_builtin): Adjust to
        new field type.
        * m4/symtab.c (m4_set_symbol_value_builtin): Rename...
        (m4__set_symbol_value_builtin): ...and populate additional fields,
        based on new type.
        (m4_get_symbol_value_func, m4_get_symbol_value_builtin): Adjust to
        new field type.
        * m4/module.c (install_builtin_table): Use cached table.
        (compare_builtin_CB): New helper function.
        (m4__module_open): Populate table.
        (module_remove): Free table.
        * m4/builtin.c (compare_builtin_name_CB): New helper function.
        (m4_builtin_find_by_name): Rewrite to use sorted table.
        (m4_builtin_find_by_func): Change return type.
        * m4/input.c (struct m4_input_block): Simplify u_b, since most
        fields can be determined from builtin.
        (builtin_peek, builtin_read, builtin_unget, init_builtin_token)
        (m4__next_token): Alter parsing so that only init_builtin_token
        consumes a builtin.
        (builtin_print, m4_push_builtin): Adjust all users.
        * tests/macros.at (Arity, defn, and freeze): Fix typo.

        Consistently cast malloc results, for C++ compilation.
        * m4/builtin.c (m4_builtin_find_by_name): Add cast.
        * m4/hash.c (m4_hash_new, m4_get_hash_iterator_next, node_new)
        (m4_hash_resize, maybe_grow): Likewise.
        * m4/m4.c (m4_create): Likewise.
        * m4/macro.c (expand_macro): Likewise.
        * m4/output.c (m4_tmpname): Likewise.
        * m4/path.c (search_path_add): Likewise.
        * m4/symtab.c (m4_symtab_create, m4_symbol_value_create)
        (symtab_fetch): Likewise.
        * m4/syntax.c (m4_syntax_create): Likewise.
        * modules/gnu.c (regexp_compile): Likewise.
        * src/main.c (main): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.

2008-03-06  Eric Blake  <ebb9@byu.net>

        Fix nested builtin(`shift',$@) regression from 2008-02-23.
        * m4/macro.c (make_argv_ref): Don't output expansion text when
        making wrapper for builtin or indir.
        * tests/builtins.at (builtin): New test.
        * NEWS: Document the fix.
        Reported by Andreas Schwab.

2008-03-04  Eric Blake  <ebb9@byu.net>

        The gnulib module free was deprecated.
        * ltdl/m4/gnulib-cache.m4: Remove free module.

2008-02-29  Eric Blake  <ebb9@byu.net>

        Import news from 1.4.10b.
        * NEWS: Update from branch.

2008-02-23  Eric Blake  <ebb9@byu.net>

        Stage 18: try harder to reuse argv in recursion.
        When pushing arguments that contain an existing $@ ref, reuse the
        ref rather than creating another layer of wrappers.
        Memory impact: noticeable improvement, due to better $@ reuse.
        Speed impact: noticeable improvement, due to O(n^2) to O(n)
        reduction in unboxed recursion.
        * m4/macro.c (make_argv_ref): Avoid wrapping $@ when possible.
        (m4_push_args): Let make_argv_ref take care of pending data.
        * doc/m4.texinfo (Improved foreach): Tweak wording to match new
        performance capability.
        * tests/others.at (recursion): Add tests to avoid performance
        regression.

2008-02-22  Eric Blake  <ebb9@byu.net>

        Update NEWS.
        * NEWS: Document change to __gnu__ on 2008-02-11.

        Stage 17: pass argv through quoted strings.
        Allow the concatenation of $@ references with other text input
        inside quoted contexts, which requires distinguishing between a
        wrapper around many arguments vs. a reference serving as part of a
        single argument.  Also optimize based on whether argv contains
        builtin tokens that might need flattening to the empty string.
        Memory impact: noticeable improvement, due to O(n^2) to O(n)
        reduction from total reuse of $@ references.
        Speed impact: noticeable improvement, due to O(n^2) to O(n)
        reduction in boxed recursion.
        * m4/m4module.h (m4_arg_equal, m4_arg_len): Add parameter.
        (M4ARGLEN): Adjust definition.
        * m4/m4private.h (struct m4__symbol_chain): Add has_func member.
        (struct m4_symbol_value): Add wrapper and has_func members.
        (struct m4_macro_args): Add flatten and has_func members.
        * m4/input.c (append_quote_token): Return argv refs inside quoted
        strings.
        (init_argv_symbol): Populate new fields.
        * m4/macro.c (expand_argument, collect_arguments, make_argv_ref)
        (m4_make_argv_ref): Likewise.
        (arg_symbol, arg_mark, m4_is_arg_text, m4_is_arg_func): Use new
        fields.
        (m4_arg_equal, m4_arg_len): Handle quoted argv references, and add
        new parameter.
        * modules/m4.c (ifelse): Adjust caller.

2008-02-22  Gary V. Vaughan  <gary@gnu.org>

        Fix regression in argument collection, from 2008-01-21.
        * m4/input.c (m4__next_token): When DEBUG_INPUT is defined,
        undo argument collection optimisation for strings, so that
        m4_print_token doesn't abort when it otherwise receives an
        unprintable M4_SYMBOL_VOID type token.

2008-02-20  Eric Blake  <ebb9@byu.net>

        Stage 16: cache quotes and improve m4_arg_print.
        Cache rather than always copying quotes when pushing $@ refs; in
        particular, reconstruct single-byte quotes on the fly.  Allow NUL
        through m4wrap.  Improve sharing of code that prints arguments.
        Memory impact: slight improvement, due to cached quotes.
        Speed impact: slight improvement, due to less copying.
        * m4/m4module.h (m4_symbol_value_print, m4_symbol_print)
        (m4_arg_print): Adjust prototypes.
        (m4_dump_args): Delete.
        (m4_push_wrapup): Split...
        (m4_push_wrapup_init, m4_push_wrapup_finish): ...into these
        prototypes.
        * m4/m4private.h (struct m4_syntax_table): Add cached_quote
        member.
        (m4__quote_cache, m4__quote_uncache): New prototypes.
        * m4/syntax.c (m4_syntax_create): Initialize the cache.
        (m4__quote_cache): New function.
        (m4_set_syntax): Update caller.
        * m4/symtab.c (m4_symbol_value_print): Add parameter.
        (m4_symbol_print, dump_symbol_CB): Adjust all callers.
        * m4/utility.c (m4_dump_args): Delete; callers should use
        m4_arg_print instead.
        * m4/input.c (m4_push_wrapup_init, m4_push_wrapup_finish): Split
        implementation, and allow embedded NUL.
        (m4_print_token, pop_input, composite_print, composite_peek):
        (composite_read, append_quote_token): Adjust all callers.
        * m4/macro.c (trace_prepre, m4_arg_text, make_argv_ref):
        Likewise.
        (m4_arg_print): Add parameters.
        (trace_pre): Rewrite in terms of m4_arg_print.
        * modules/m4.c (errprint): Likewise.
        (m4wrap): Rewrite to allow embedded NUL.
        (dumpdef): Adjust caller.
        * doc/m4.texinfo (Debuglen): Enhance debuglen test.
        * tests/null.m4: Test for NUL in m4wrap.
        * tests/null.out: Update expected output.

        Fix out-of-bounds read for sanitized macro names, from 2008-02-06.
        * m4/utility.c (m4_verror_at_line): Properly terminate the string.
        Reported by Ralf Wildenhues.

        * doc/m4.texinfo (Debuglen, Changesyntax): Fix typos.

2008-02-19  Eric Blake  <ebb9@byu.net>

        Clean up example on filtering defined symbols.
        * doc/m4.texinfo (Foreach, Improved foreach): Document another
        shortcoming in foreach.m4, and improve filter example by using
        foreach2.m4.

        * src/main.c (usage): Fix typo.

2008-02-18  Eric Blake  <ebb9@byu.net>

        Avoid some magic numbers.
        * m4/m4private.h (CHAR_EOF, CHAR_BUILTIN, CHAR_QUOTE, CHAR_ARGV)
        (CHAR_RETRY): Define in terms of UCHAR_MAX.
        * m4/syntax.c (m4_syntax_create, set_syntax_set)
        (reset_syntax_set, check_is_single_quotes)
        (check_is_single_comments, check_is_macro_escaped)
        (m4_set_quotes, m4_set_comment): Likewise.
        * modules/gnu.c (regexp_compile): Likewise.
        * modules/m4.c (translit): Likewise.
        * src/freeze.c (produce_syntax_dump): Likewise.
        Reported by Ralf Wildenhues.

2008-02-16  Eric Blake  <ebb9@byu.net>

        Add regression test for multi-character quote recursion.
        * examples/foreach2.m4: Use $0 rather than spelling out name.
        * examples/foreachq2.m4: Likewise.
        * examples/forloop2.m4: Likewise.
        * examples/hanoi.m4: Likewise.
        * examples/trace.m4: Likewise.
        * doc/m4.texinfo (Improved forloop): Document advantage of $0.
        (Improved foreach): Adjust dump from file.

        Stage 15: return argv refs back to collect_arguments.
        Collect an entire $@ reference at once rather than one argument at
        a time, outside of quotes (but inside quotes, $@ is still
        flattened for now).  The skip_last field allows concatenation of
        $@ with other text when collecting arguments.
        Memory impact: noticeable improvement, due to better reuse of $@.
        Speed impact: noticeable improvement, due to less parsing.
        * m4/m4private.h (CHAR_ARGV): New input engine sentinel.
        (enum m4__token_type): Add M4_TOKEN_ARGV.
        (struct m4__symbol_chain): Add skip_last member to argv link.
        (m4__next_token): Add parameter.
        * m4/input.c (peek_char, file_peek, builtin_peek, string_peek)
        (composite_peek, m4__next_token): Add new parameter.
        (composite_read, append_quote_token): Support argv in quotes.
        (init_argv_symbol): New function.
        (m4__push_symbol, match_input, consume_syntax)
        (m4__next_token_is_open, m4_print_token): Adjust callers.
        * m4/macro.c (m4_macro_expand_input, m4__arg_adjust_refcount)
        (arg_mark, m4_arg_text, make_argv_ref): Likewise.
        (expand_argument, collect_arguments): Handle new token.
        (arg_symbol): Drill through $@ reference.
        * m4/syntax.c (set_quote_age): Detect disabled comments.
        * m4/symtab.c (dump_symbol_CB) [DEBUG_SYM]: Fix debug code.

2008-02-15  Eric Blake  <ebb9@byu.net>

        * modules/gnu.c (regexp_compile): Use a fastmap for regex speed.

2008-02-13  Eric Blake  <ebb9@byu.net>

        Fix texinfo grammar.
        * doc/m4.texinfo (Eval, Incompatibilities): Use @. after capital.
        (History): Use @: after abbreviations.
        (M4exit): Use correct Latin abbreviation.
        (Dumpdef, Debugmode, Frozen file format 2): Use correct spacing
        between sentences.

2008-02-11  Eric Blake  <ebb9@byu.net>

        Allow builtin text macros to specify number of arguments.
        * m4/m4module.h (struct m4_macro): Add argument limits to builtin
        text macros.
        * m4/module.c (install_macro_table): Allow text macros to warn on
        extra arguments.
        * modules/gnu.c (m4_macro_table): Update all clients.
        * modules/load.c (m4_macro_table): Likewise.
        * modules/mpeval.c (m4_macro_table): Likewise.
        * modules/perl.c (m4_macro_table): Likewise.
        * modules/shadow.c (m4_macro_table): Likewise.
        * modules/traditional.c (m4_macro_table): Likewise.
        * modules/modtest.c (m4_macro_table): Likewise.  Also add text
        macros, for testing this.
        * doc/m4.texinfo (Standard Modules): Update text, and enhance
        test.
        * tests/modules.at (modules: text): New test.

        Fix regression in command line -D option, from 2006-08-25.
        * m4/m4private.h (m4_symbol_value_create): Delete fast accessor.
        * m4/m4module.h: Fix typo.
        * m4/symtab.c (m4_symbol_value_create): Prime the maximum number
        of arguments.
        * tests/macros.at (Command line define): Enhance test.
        * tests/others.at (nul character): Enhance test.
        * tests/null.m4: Likewise.
        * tests/null.out: Likewise.

        Use gnulib's git-merge-changelog driver when available.
        * .gitattributes: Add merge attributes for ChangeLog.
        * bootstrap: Install driver, if not already present.

2008-02-06  Eric Blake  <ebb9@byu.net>

        Fix security hole introduced 2007-11-23.
        * m4/utility.c (m4_verror_at_line): Properly escape macro names.
        * src/main.c (main): Manage quoteargs defaults.
        * doc/m4.texinfo (Indir): Document and test this.

        Using raw strtod is not portable.
        * ltdl/m4/gnulib-cache.m4: Import the strtod module.

2008-02-02  Eric Blake  <ebb9@byu.net>

        Consistently use size_t for number of arguments.
        * m4/m4module.h (m4_builtin_func): Alter prototype.
        (struct m4_builtin): Adjust type of min_args, max_args.
        (M4BUILTIN, M4BUILTIN_HANDLER): Adjust all builtins.
        (m4_bad_argc, m4_dump_args, m4_macro_call, m4_arg_argc)
        (m4_arg_symbol, m4_is_arg_text, m4_is_arg_func, m4_arg_text)
        (m4_arg_equal, m4_arg_empty, m4_arg_len, m4_arg_func)
        (m4_arg_print, m4_push_arg): Adjust all clients.
        * m4/m4private.h (struct m4__symbol_chain, m4_symbol_value)
        (m4_macro_args): Adjust type of various fields.
        (m4__push_arg_quote): Adjust all clients.
        * m4/input.c (m4_pop_wrapup): Likewise.
        * m4/macro.c (m4_macro_call, trace_pre, make_argv_ref)
        (arg_symbol, m4_arg_symbol, m4_is_arg_text, m4_is_arg_func)
        (m4_arg_text, m4_arg_equal, m4_arg_empty, m4_arg_len)
        (m4_arg_func, m4_arg_print, m4_make_argv_ref, m4_push_arg)
        (m4__push_arg_quote, m4_push_args, m4_arg_argc): Likewise.
        * m4/utility.c (m4_bad_argc, m4_dump_args): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.
        * modules/gnu.c (changesyntax): Likewise.
        * modules/m4.c (m4_dump_symbols, undefine, popdef, ifelse, defn)
        (undivert, traceon, traceoff): Likewise.
        * modules/m4.h (m4_dump_symbols_func): Likewise.
        * modules/perl.c (perleval): Likewise.

        Stage 14b: allow pushing argv references.
        Push a $@ reference to the input engine in one go, rather than
        pushing each element.  For now, argument collection still gets one
        argument of a $@ at a time; but the penalties of this patch make
        it easier to manage $@ efficiently in future patches.
        Memory impact: noticeable penalty, due to larger struct and O(n)
        to O(n^2) on unboxed recursion.
        Speed impact: noticeable penalty, due to more bookkeeping.
        * m4/m4private.h (struct m4__symbol_chain): Add comma and quotes
        fields.
        (struct m4_macro_args): Add level field.
        (m4__arg_adjust_refcount, m4__push_arg_quote): New prototypes.
        * m4/input.c (m4__push_symbol, composite_peek, composite_read)
        (composite_unget, composite_clean, composite_print): Support $@
        refs.
        * m4/macro.c (collect_arguments): Populate new field.
        (expand_macro): Move argv cleanup...
        (m4__arg_adjust_refcount): ...to this new function.
        (m4_arg_symbol, m4_make_argv_ref, m4_push_arg): Factor...
        (arg_symbol, make_argv_ref, m4__push_arg_quote): ...to these new
        helper functions, to add parameters.
        (m4_push_args): Adjust caller.
        * m4/symtab.c (m4_symbol_value_print): Likewise.

        Stage 14a: allow printing argv references.
        Refactor symbol-value printing code for better sharing, and to
        allow printing a contiguous text representation of a $@ ref.
        Memory impact: none.
        Speed impact: none.
        * m4/m4module.h (m4_arg_print): New prototype.
        (m4_symbol_value_print): Alter prototype.
        * m4/input.c (struct input_funcs): Add parameter to peek_func.
        (file_peek, builtin_peek, string_peek): Ignore new parameter.
        (composite_peek): Ignore new parameter, for now.
        (composite_clean, pop_input): Rework to minimize indirection, and
        to avoid infinite recursion in next patch.
        * m4/macro.c (trace_prepre, trace_pre): Adjust callers.
        (m4_arg_print): New function.
        * m4/symtab.c (m4_symbol_value_print): Update signature.
        (m4_symbol_print): Update caller.
        * m4/output.c (m4_shipout_string_trunc): Update comments.
        * m4/syntax.c (set_quote_age): Require comma as argument separator
        when dealing with $@ as a unit.
        * tests/builtins.at (ifelse): Augment test.
        * doc/m4.texinfo (Changesyntax): Document changesyntax deficiency.

2008-01-31  Eric Blake  <ebb9@byu.net>

        Kill hack for M4 1.4.4.
        * configure.ac (AM_GNU_GETTEXT_INTL_SUBDIR): Delete, now that
        we require new enough autoconf which in turn requires M4 1.4.5.

2008-01-31  Gary V. Vaughan  <gary@gnu.org>
        and Eric Blake  <ebb9@byu.net>

        Depend on new libtool to use non-recursive build.
        * configure.ac (LT_PREREQ): Bump to alpha release version.
        (LTDL_INIT): Choose nonrecursive mode.  Perform sanity check that
        installed libtool has correct symbols.
        * Makefile.am (SUBDIRS): Drop ltdl, now that it is built from the
        top level.
        (AM_CPPFLAGS): Drop directories covered by libtool.
        (AM_LDFLAGS): Drop -no-undefined, covered by libtool.
        (include_HEADERS, noinst_LTLIBRARIES, EXTRA_LTLIBRARIES): New
        macros, used by libtool.
        (lib_LTLIBRARIES): Also used by libtool.
        (ltdl/libltdlc.la): Delete, now that libtool does this.
        * bootstrap: Mention new requirements.
        (LIBTOOLIZE): Provide default program, and run libtoolize prior to
        autoreconf.
        (autoreconf): Also neutralize libtoolize, since it is run early.
        * HACKING: Mention updated prerequisites.

2008-01-28  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        Fix build failure if installed libltdl is used.
        * Makefile.am (m4_libm4_la_DEPENDENCIES): Use $(LTDLDEPS).

2008-01-28  Eric Blake  <ebb9@byu.net>

        Depend on newer autoconf, for testsuite -C dir.
        * Makefile.am (CD_TESTDIR): Delete, no longer required.
        (check-local, installcheck-local, clean-local-tests): Use new -C
        option from autotest.
        * configure.ac (AC_PREREQ): Bump to 2.61a.347.
        * bootstrap: Mention new dependency.
        * HACKING: Likewise.

2008-01-27  Eric Blake  <ebb9@byu.net>

        Stage 13: push composite text tokens.
        Support pushing composite tokens, allowing back-references to be
        reused through multiple macro expansions.  Add hueristic that
        avoids creating new reference when pushing existing references.
        Memory impact: noticeable improvement due to better reference
        reuse, except for O(n) to O(n^2) copying in boxed recursion.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/m4private.h (m4__push_symbol): Adjust prototype.
        * m4/input.c (m4__push_symbol): Add parameter, and support
        composite tokens.
        (append_quote_token): Add parameter, and support inlining of short
        text.
        (m4__next_token): Adjust caller.
        * m4/macro.c (m4_push_arg, m4_push_args): Likewise.

2008-01-26  Eric Blake  <ebb9@byu.net>

        Stage 12c: add macro for m4_arg_len.
        Make a common action easier to type.
        Memory impact: none.
        Speed impact: none.
        * m4/m4module.h (M4ARGLEN): New macro.
        * m4/macro.c (process_macro): Adjust all callers.
        * m4/utility.c (m4_dump_args): Likewise.
        * modules/m4.c (divert, maketemp, mkstemp, m4wrap, len, index)
        (substr): Likewise.
        * modules/gnu.c (builtin, indir, mkdtemp, patsubst, regexp)
        (renamesyms): Likewise.
        * modules/stdlib.c (setenv): Likewise.

        Stage 12b: add m4_string_pair.
        Make passing quote delimiters around more efficient.
        Memory impact: none.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/m4module.h (m4_string_pair): New type.
        (m4_get_syntax_quotes, m4_get_syntax_comments): New prototypes.
        (m4_symbol_value_print, m4_symbol_print, m4_shipout_string_trunc):
        Alter signature.
        * m4/m4private.h (struct m4_string): Delete.
        (struct m4_syntax_table): Combine quote and comment members.
        (m4_get_syntax_lquote, m4_get_syntax_rquote, m4_get_syntax_bcomm)
        (m4_get_syntax_ecomm): Adjust accessors.
        (m4_get_syntax_quotes, m4_get_syntax_comments): New fast
        accessors.
        * m4/symtab.c (m4_symbol_value_print, m4_symbol_print):
        Alter signatures.
        * m4/input.c (string_print, composite_print, m4_input_print):
        All callers updated.
        * m4/syntax.c (m4_syntax_delete, m4_set_syntax)
        (check_is_single_quotes, m4_set_quotes, set_quote_age)
        (m4_get_syntax_lquote, m4_get_syntax_rquote)
        (m4_get_syntax_quotes, check_is_single_comments, m4_set_comment)
        (m4_get_syntax_bcomm, m4_get_syntax_ecomm)
        (m4_get_syntax_comments): Likewise.
        * m4/macro.c (trace_prepre, trace_pre, m4_push_args): Likewise.
        * m4/output.c (m4_shipout_string, m4_shipout_string_trunc):
        Likewise.
        * modules/m4.c (dumpdef, m4_make_temp): Likewise.
        * src/freeze.c (produce_frozen_state): Likewise.
        * tests/freeze.at (reloading unknown builtin): Update test.

        Stage 12a: make m4_symbol_chain a union.
        Shrink size of symbol chains by using a union.
        Memory impact: slight improvement, due to smaller struct.
        Speed impact: slight improvement, due to less bookkeeping.
        * m4/m4private.h (enum m4__symbol_chain_type): New enum.
        (struct m4_symbol_chain): Rename...
        (struct m4__symbol_chain): ...to this, since it is internal.
        * m4/symtab.c (m4_symbol_value_copy, m4_symbol_value_print): All
        callers updated.
        * m4/input.c (struct m4_input_block, m4__push_symbol)
        (composite_peek, composite_read, composite_unget)
        (composite_clean, composite_print, m4__make_text_link)
        (append_quote_token): Likewise.
        * m4/macro.c (expand_macro, arg_mark, m4_arg_symbol, m4_arg_text)
        (m4_arg_equal, m4_arg_len, m4_make_argv_ref, m4_push_arg)
        (m4_push_args): Likewise.

2008-01-23  Eric Blake  <ebb9@byu.net>

        Adjust to recent libtool interface change.
        * configure.ac (LT_PREREQ): Require bleeding-edge libtool.
        (LT_WITH_LTDL): Delete, now that it is obsolete.
        (LTDL_INIT): Use new libtool macro.

2008-01-22  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
        and Eric Blake  <ebb9@byu.net>

        Rely on newer automake.
        * configure.ac (AM_INIT_AUTOMAKE): Require 1.10.1, and add lzma
        distribution.
        * bootstrap: Update automake requirement.
        (func_version): Fix --version output, broken since 2007-08-06.
        * HACKING: Likewise.  Add lzma requirement.
        * Makefile.am (clean-local-src): Not needed any more with newest
        Automake.
        (clean-local): Adjust.
        * TODO: Remove completed item.

2008-01-22  Eric Blake  <ebb9@byu.net>

        Doc tweak.
        * doc/m4.texinfo (Renamesyms): Avoid underfull hbox, and improve
        example.

2008-01-21  Eric Blake  <ebb9@byu.net>

        Stage 11: full circle for single argument references.
        Pass quoted strings through to argument collection in a single
        action, so that an argument can be reused throughout macro
        recursion if it remains unchanged.
        Memory impact: noticeable improvement, due to more reuse in
        argument collection stacks; O(n^2) to O(n) on boxed recursion.
        Speed impact: noticeable improvement, due to less copying.
        * m4/m4module.h (m4_arg_text): Add parameter.
        (M4ARG): Adjust.
        * m4/m4private.h (CHAR_QUOTE): New input engine sentinel.
        (m4__make_text_link): New prototype.
        (struct m4_symbol_chain): Add quote_age member.
        (struct m4_symbol_value): Add end member to chained symbol.
        (struct m4_macro_args): Add wrapper member.
        * m4/symtab.c (m4_symbol_value_print): Print composite tokens.
        (m4_symbol_value_copy, m4_symbol_value_delete): Recognize
        composite tokens.
        * m4/input.c (make_text_link): Rename...
        (m4__make_text_link): ...to this, and export.
        (m4_push_string_finish): Adjust caller.
        (make_text_link, m4__push_symbol): Update new field.
        (file_read, builtin_read, string_read, composite_read, next_char):
        Add parameter.
        (m4_skip_line, match_input, consume_syntax): Adjust callers.
        (append_quote_token): New function.
        (m4__next_token): Pass quoted strings onto argument collection.
        (m4_print_token) [DEBUG_INPUT]: Update.
        * m4/macro.c (expand_argument): Collect composite arguments.
        (collect_arguments): Update new field.
        (expand_macro): Reduce ref-count of back-references after use.
        (arg_mark, m4_arg_symbol, m4_make_argv_ref): Adjust to new member
        names.
        (m4_is_arg_text): Also recognize composite symbols as text.
        (m4_arg_text, m4_arg_len): Merge composite symbols as needed.
        (m4_arg_equal): Compare composite symbols.
        (m4_push_arg, m4_push_args): Handle composite symbols.
        (m4_arg_symbol): Relax assertion.
        (process_macro): Use single-argument references.
        * m4/output.c (m4_shipout_string_trunc): Update comment.
        * tests/macros.at (Rescanning macros): Augment test.

2008-01-16  Eric Blake  <ebb9@byu.net>

        Stage 10: avoid extra copying of strings and comments.
        When collecting tokens that are immune to further expansion, avoid
        copying data from one obstack to another by outputting it into the
        destination obstack to begin with.  Also reduce copying done in
        format builtin.
        Memory impact: slight improvement, due to better obstack usage.
        Speed impact: noticeable improvement, due less data copying.
        * ltdl/m4/gnulib-cache.m4: Import intprops and vasnprintf-posix
        modules.
        * m4/m4private.h (m4__token_type): Adjust prototype.
        * m4/input.c (m4__next_token): Support new parameter.
        * m4/macro.c (m4_macro_expand_input, expand_token)
        (expand_argument, collect_arguments): Adjust callers.
        * modules/m4.c (ntoa): Tighten buffer size.
        * m4/output.c (m4_tmpname): Guarantee no buffer overflow.
        * modules/format.c (arg_int, arg_long, arg_double): New helper
        functions, to detect overflow or unparsed characters.
        (ARG_INT, ARG_LONG, ARG_STR, ARG_DOUBLE): Adjust to check for
        missing or excess arguments.
        (format): Likewise, and also output directly into obstack if there
        is room.
        * doc/m4.texinfo (History): Update for new year.
        (Format): Test for new warnings.

2008-01-15  Eric Blake  <ebb9@byu.net>

        * TODO: Update with some newer URLs.

        Verify linear `index'.
        * tests/builtins.at (index): New test.
        (translit): Make test take longer, to make quadratic algorithms
        more apparent.

2007-12-20  Eric Blake  <ebb9@byu.net>

        Stage 9: share rather than copy single-arg refs.
        Use hooks of previous patch to create back-references to arguments
        in the input engine, and inline short text rather than always
        creating a FIFO link.  Also start testing embedded NUL behavior.
        Until the argument collection engine also shares references, the
        memory usage increases.
        Memory impact: noticeable penalty, due to longer life of argv
        changing O(n) to O(n^2) on boxed recursion.
        Speed impact: slight improvement, due less data copying.
        * ltdl/m4/gnulib-cache.m4: Import memmem and quote modules.
        * m4/m4module.h (m4_arg_scratch): New prototype.
        * m4/m4private.h (m4__push_symbol): Add parameter.
        (m4_arg_scratch): Add fast accessor.
        (struct m4): Add expansion_level member, taken...
        * m4/macro.c (expansion_level): ...from here.  Adjust all users.
        (expand_argument): Minor cleanup.
        (expand_macro): Track scratch space per macro call.
        (m4_arg_scratch): New function.
        (m4_make_argv_ref): Call new function.
        (m4_push_arg): Push reference to $0.
        (m4_push_args): Rework separator usage, since separators will
        usually be inlined.
        (process_macro): Allow embedded NUL.
        * m4/input.c (INPUT_INLINE_THRESHOLD): New define.
        (m4__push_symbol): Add parameter.  Inline short strings, and save
        references through rescanning.
        * m4/symtab.c (m4_set_symbol_value_text): Weaken assertion.
        * modules/m4.c (errprint, index): Handle NUL transparently.
        (dumpdef, translit): Use scratch space, rather than expansion
        stack.
        * modules/gnu.c (renamesyms, m4symbols): Likewise.
        * tests/others.at (nul character): New test.
        (iso8859): Quote absolute file name, remove XFAIL.
        * tests/iso8859.m4: Avoid raw NUL in output.
        * tests/null.m4: New file.
        * tests/null.out: Likewise.
        * tests/null.err: Likewise.
        * Makefile.am (OTHER_FILES): Distribute new files.
        * .gitattributes: Treat new files as text.

2007-12-17  Eric Blake  <ebb9@byu.net>

        Stage 8: extend life of references into argv.
        Add hooks to lengthen the lifetime of arguments reused in a macro
        expansion, rather than always discarding arguments at the end of
        expand_macro.  Rework the expand_macro obstacks to handle longer
        lifetimes.  For now, the hooks remain unused.
        Memory impact: slight penalty, due to larger structs.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/system_.h (obstack_regrow): Delete.
        * m4/m4private.h (struct m4_symbol_chain): Add level field.
        (m4__push_symbol): Adjust prototype.
        (m4__adjust_refcount): New prototype.
        (DEBUG_MACRO) [DEBUG]: New debug control.
        (struct m4__macro_arg_stacks): New structure.
        (struct m4): Add arg_stacks, stacks_count fields.
        * m4/m4module.h (m4_make_argv_ref): Add parameter.
        * m4/macro.c (argc_stack, argv_stack): Delete, replaced by
        context->arg_stacks.
        (m4_macro_expand_input) [DEBUG_MACRO]: Add debug hooks,
        conditional on M4_DEBUG_MACRO envvar.
        (collect_arguments): Adjust signature.
        (expand_macro): Rework obstack handling.
        (m4__adjust_refcount, arg_mark): New functions.
        (m4_make_argv_ref): Populate new field.
        (m4_push_arg, m4_push_args): Track inuse.
        (process_macro): One less cast.
        * m4/m4.c (m4_delete): Clean up arg_stacks.
        * m4/input.c (make_text_link): Use new field.
        (m4__push_symbol, file_clean): Update signature.
        (composite_read): Bump refcount when done with reference.
        (composite_clean): New function.
        (pop_input): Adjust caller.
        * m4/debug.c (m4_debug_message): Make assertion match comment.
        * modules/gnu.c (builtin, indir): Adjust callers.
        * tests/builtins.at (ifelse): New test.
        (exp): Move and rename...
        * tests/others.at (countdown): ...to this.
        * doc/m4.texinfo (Improved foreach): Fix tracing usage in
        example.

2007-12-13  Eric Blake  <ebb9@byu.net>

        Yet more rewording.
        * doc/m4.texinfo (Inhibiting Invocation): Missed one instance in
        the previous patch.

        * THANKS: Update.

2007-12-13  Paolo Bonzini  <bonzini@gnu.org>  (tiny change)

        * doc/m4.texinfo (Inhibiting Invocation): Fix quoting of a quoting
        example.
        Reported by Giovanni Toffetti.

2007-12-11  Eric Blake  <ebb9@byu.net>

        Stage 7: use chained input support in input parser.
        Allow the LIFO input engine to rescan a macro expansion composed
        of smaller chunks of FIFO data, rather than the old approach of a
        monolithic string.  For now, all chunks are still copied.
        Memory impact: slight penalty, due to FIFO chain overhead.
        Speed impact: slight penalty, due to extra bookkeeping.
        * m4/m4private.h (m4__push_symbol): New prototype.
        (struct m4_symbol_chain): Add const-safety.
        * m4/symtab.c (m4_symbol_value_print): Simplify.
        (dump_symbol_CB): Update caller.
        * m4/input.c (struct m4_input_block): Alter u_c member, first
        introduced 2006-10-25, but unused until now.
        (composite_peek, composite_read, composite_unget)
        (composite_print, init_builtin_token): Rewrite accordingly.
        (m4_push_wrapup): No longer need trailing NUL.
        (m4__push_symbol, make_text_link): New functions.
        (m4_push_string_finish): Use them.
        * m4/macro.c (m4_push_arg, m4_push_args): Likewise.
        (expand_macro): Simplify logic of nesting_limit.
        * src/main.c (main): Likewise.
        * doc/m4.texinfo (Dumpdef): Augment test.

2007-12-08  Eric Blake  <ebb9@byu.net>

        Stage 6: convert builtins to push arg at a time.
        Add new methods to factor all builtins whose expansion includes an
        argument, making back-reference creation easier in future patches.
        Factor out length-limited printing to obstacks, and use -1 rather
        than 0 for unlimited length.
        Memory impact: none.
        Speed impact: slight improvement, due to better code sharing.
        * m4/m4module.h (m4_shipout_text): Rename...
        (m4_divert_text): ...to this, to avoid confusion with m4_shipout_*
        that does not worry about sync lines.
        (m4_shipout_string_trunc): New prototype.
        * m4/output.c (m4_shipout_text): Rename...
        (m4_divert_text): ...to this.
        (m4_shipout_string): Move guts...
        (m4_shipout_string_trunc): ...to this new function.
        * m4/macro.c (m4_push_arg, m4_push_args): New functions.
        (expand_token, process_macro): Update callers.
        * m4/input.c (string_print): Likewise.
        * modules/m4.c (ifdef, ifelse, shift, substr, translit, divert):
        Likewise.
        * modules/gnu.c (patsubst): Likewise.
        (debuglen): Use SIZE_MAX for unlimited debug length.
        * src/main.c (main): Likewise.
        * m4/m4.c (m4_create): Default max_debug_length to SIZE_MAX, not
        zero.

2007-12-07  Eric Blake  <ebb9@byu.net>

        Minor security fix: Quote output of mkstemp.
        * modules/m4.c (m4_make_temp): Produce quoted output.
        * doc/m4.texinfo (Mkstemp, Mkdtemp): Update the documentation and
        tests.

        Stage 5: add notion of quote age.
        Cache the quoting rules that were in effect when a string was
        parsed, to avoid reparsing that string if no changequote or other
        quote age change took place in the meantime.  A quote_age of 0 is
        always safe, but does not benefit from caching.
        Memory impact: slight improvement, due to smaller struct in input
        engine.
        Speed impact: slight penalty, due to more bookkeeping.
        * m4/m4module.h (m4_get_symbol_value_quote_age): New prototype.
        (m4_set_symbol_value_text): Adjust prototype.
        (m4_has_syntax): Factor out the unsigned char cast.
        * m4/m4private.h (struct m4_syntax_table): Add syntax_age and
        quote_age members.
        (m4__quote_age, m4__safe_quotes): New accessor macros, no need for
        functions at this point.
        (struct m4_symbol_value, struct m4_macro_args): Add quote_age
        member.
        (m4_set_symbol_value_text): Adjust fast accessor.
        (m4_get_symbol_value_quote_age): New fast accessor.
        * m4/symtab.c (m4_set_symbol_value_text): Add parameter.
        (m4_get_symbol_value_quote_age): New function.
        (m4_symbol_value_copy): Adjust callers.
        * m4/macro.c (expand_token): Add parameter, and track quote age.
        (expand_argument, collect_arguments): Track quote age.
        (m4_macro_expand_input, process_macro, m4_make_argv_ref)
        (m4_macro_expand_input): Update callers.
        (m4_arg_text, m4_arg_len, m4_arg_func): Abort on type mismatch.
        * m4/input.c: Comment cleanups.
        (struct m4_input_block): Reduce size.
        (m4__next_token): Report quote age.
        (m4_push_builtin, init_builtin_token): Update callers.
        * m4/utility.c (skip_space): Adjust callers.
        * m4/module.c (install_macro_table): Likewise.
        * m4/syntax.c (m4_set_syntax): Initialize and update quote age.
        (m4_set_quotes, m4_set_comment): Detect no-op changes, and update
        quote age.
        (set_quote_age): New helper function.
        (check_is_single_quotes, check_is_single_comments): Adjust
        callers.
        * src/freeze.c (reload_frozen_state): Likewise.
        * src/main.c (main): Likewise.
        * modules/m4.c (define, pushdef): No need to set macro text.
        * tests/builtins.at (changequote, defn): New tests.
        * examples/wrapfifo.m4: New file.
        * examples/wraplifo.m4: New file.
        * Makefile.am (dist_pkgdata_DATA): Distribute new examples.

2007-12-04  Eric Blake  <ebb9@byu.net>

        Fix builds with OpenBSD make.
        * Makefile.am (HELP2MAN): New macro.
        (dist_man_MANS, doc/m4.1): Fix rules for building m4.1 into
        srcdir.
        * README: Update copyright.
        * HACKING: Mention help2man and makeinfo dependencies.

2007-11-29  Eric Blake  <ebb9@byu.net>

        Stage 4: route indir, builtin through ref; make argv opaque.
        Finish making struct opaque to all but the input engine, by
        reworking obstack usage in expand_macro to better support creation
        of a $@ reference.  Canonicalize the empty argument, to allow
        pointer comparison optimizations.
        Memory impact: slight penalty, due to larger struct.
        Speed impact: slight improvement, due to fewer function calls.
        * m4/system_.h (obstack_regrow): Fix precedence.
        * m4/m4module.h (m4_arg_equal, m4_arg_empty, m4_make_argv_ref):
        New prototypes.
        (struct m4_macro_args): Move...
        * m4/m4private.h (struct m4_macro_args): ...here, making it opaque
        to modules.  Add has_ref member.
        (bool_bitfield): New helper typedef.
        (struct m4_symbol_chain): Add flatten and len members.
        * m4/macro.c (empty_symbol): New placeholder, for optimizing
        comparison with empty string.
        (m4_macro_expand_input): Initialize it.
        (collect_arguments): Alter signature, and populate new fields.
        (trace_pre, trace_post): Remove redundant parameter.
        (expand_macro): Alter handling of obstacks.
        (m4_arg_symbol): Account for wrapped argv.
        (m4_arg_equal, m4_arg_empty, m4_make_argv_ref): New methods.
        (m4_arg_text, m4_arg_len, m4_arg_func): Use new methods.
        * modules/m4.c (ifelse, syscmd): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.
        (undefine, popdef, m4_dump_symbols): Optimize.
        * modules/gnu.c (builtin, indir, esyscmd, debugfile): Use new
        methods.
        (changesyntax, regexp): Optimize.
        * m4/output.c (diversion_storage): Use typedef.

        Stage 3b: cache length, rather than computing it, in modules.
        Use cached token length in builtins and output engine.
        Memory impact: none.
        Speed impact: noticeable improvement, due to fewer function calls.
        * m4/hash.c (m4_hash_remove): Avoid double free on remove
        failure.
        * m4/output.c (m4_shipout_string): Change semantics of len param.
        (m4_shipout_int): Use cached length.
        * m4/input.c (m4_push_string_finish): Likewise.
        * modules/m4.h (m4_make_temp_func): Add parameter.
        * m4/macro.c (expand_token, m4_arg_len): Use cached length.
        (collect_arguments, expand_macro): Alter signature.
        (trace_format): Don't use out-of-scope buffer.
        (process_macro): All callers changed.
        * m4/utility.c (m4_dump_args): Likewise.
        * m4/symtab.c (m4_symbol_value_print): Likewise.
        * modules/gnu.c (__file__, __program__, builtin, indir)
        (m4symbols, mkdtemp, regexp_compile, regexp_substitute,
        renamesyms, patsubst, regexp, regexp_compile): Likewise.
        * modules/load.c (m4modules): Likewise.
        * modules/m4.c (defn, m4wrap, maketemp, m4_make_temp)
        (numb_obstack, ifdef, ifelse, divert, len, substr): Likewise.
        * modules/perl.c (perleval): Likewise.
        * modules/stdlib.c (getcwd, getenv, getlogin, getpwnam, getpwuid)
        (hostname, uname, setenv): Likewise.
        * modules/mpeval.c (numb_obstack): Likewise.
        * src/freeze.c (dump_symbol_CB): Likewise.
        * doc/m4.texinfo (Renamesyms, Dumpdef, Changesyntax): Adjust test.
        * tests/builtins.at (mkstemp): Likewise.
        * tests/others.at (iso8859): XFAIL this test, now that
        length-based handling allows NUL through part but not all of M4.

2007-11-28  Eric Blake  <ebb9@byu.net>

        Stage 3a: cache length, rather than computing it, in libm4.
        Cache the length of a token in the input engine and symbol table,
        to avoid repeating lots of strlen calls.  Additionally, by using
        obstack length rather than strlen, the input engine can now
        support embedded NUL.
        Memory impact: slight penalty, due to larger struct.
        Speed impact: slight improvement, due to fewer function calls.
        * m4/m4module.h (struct m4_macro_args): Cache length.
        (m4_get_symbol_len, m4_get_symbol_value_len): New accessors.
        (m4_set_symbol_value_text): Change signature.
        * m4/m4private.h (struct m4_symbol_value): Store string length.
        (m4_get_symbol_value_text, m4_get_symbol_value_placeholder)
        (m4_set_symbol_value_placeholder): Update accordingly.
        (m4_set_symbol_value_text): Change signature.
        (m4_get_symbol_value_len): New accessor.
        * m4/input.c (struct m4_input_block, string_peek, string_read)
        (string_unget, string_print, m4_push_string_finish)
        (m4_push_wrapup): Track length of string input.
        (m4__next_token): Adjust all users of symbol text to track length,
        too.
        * m4/macro.c (expand_argument, collect_arguments): Likewise.
        * m4/module.c (install_macro_table): Likewise.
        * modules/gnu.c (builtin, indir): Likewise.
        * modules/m4.c (define, pushdef): Likewise.
        * src/main.c (main): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * m4/symtab.c (m4_symbol_value_copy): Likewise.
        (m4_get_symbol_value_len): New function.
        (m4_get_symbol_value_text, m4_get_symbol_value_placeholder)
        (m4_set_symbol_value_text, m4_set_symbol_value_placeholder):
        Adjust implementation.

2007-11-27  Eric Blake  <ebb9@byu.net>

        Stage 2: use accessors, not direct reference, into argv.
        Outside of macro.c, use accessor methods rather than direct access
        into the argv struct.
        Memory impact: none.
        Speed impact: slight penalty, due to increased function calls.
        * m4/m4private.h (m4_arg_argc): New fast accessor.
        * m4/m4module.h (m4_arg_argc, m4_arg_symbol, m4_is_arg_text)
        (m4_is_arg_func, m4_arg_text, m4_arg_len, m4_arg_func): New
        prototypes.
        (m4_builtin_func, M4BUILTIN, M4BUILTIN_HANDLER, m4_dump_args)
        (m4_macro_call): Make argc unsigned.
        (M4ARG): Use new accessors.
        * modules/m4.c (define, pushdef): Likewise.
        (undefine, popdef, ifelse, m4_dump_symbols, defn, undivert)
        (traceon, traceoff): Make argc unsigned.
        * modules/m4.h (m4_dump_symbols_func): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.
        * modules/gnu.c (builtin, indir): Use new accessors.
        (changesyntax): Make argc unsigned.
        * modules/perl.c (perleval): Likewise.
        * m4/utility.c (m4_dump_args): Use new accessors.
        * m4/macro.c (trace_pre): Likewise.
        (m4_arg_symbol, m4_arg_argc, m4_is_arg_text, m4_is_arg_func)
        (m4_arg_text, m4_arg_len, m4_arg_func): New functions.
        (expand_macro, trace_pre, trace_post, m4_macro_call): Update argc
        usage.

2007-11-24  Eric Blake  <ebb9@byu.net>

        Stage 1: convert m4_symbol_value** into new object.
        Pass a variable-size wrapper structure instead of an array to
        builtins, so that subsequent optimizations in the structure need
        not impact every builtin client.
        Memory impact: slight penalty, since struct is larger than array.
        Speed impact: slight penalty, due to increased bookkeeping.
        * ltdl/m4/gnulib-cache.m4: Import flexmember module.
        * m4/m4module.h (m4_macro_args): New type, will be opaque to
        modules later.
        (m4_builtin_func, M4BUILTIN, M4BUILTIN_HANDLER, m4_dump_args)
        (m4_macro_call): Alter signature to use m4_macro_args object.
        (M4ARG): Redefine to access new struct.
        * m4/m4private.h (M4_SYMBOL_COMP): New enumerator.
        (struct m4_symbol_chain): New type.
        (struct m4_symbol_value): Add chain alternative.
        * m4/macro.c (collect_arguments): Build new struct.
        (expand_macro, m4_macro_call, process_macro, trace_pre)
        (trace_post): Adjust implementation to use it.
        * m4/utility.c (m4_dump_args): Likewise.
        * modules/gnu.c (builtin, indir): Likewise.
        * modules/format.c (format): Likewise.
        * modules/m4.h (m4_dump_symbols_func): Likewise.
        * modules/m4.c (m4_dump_symbols, define, pushdef, defn, ifelse)
        (shift, include, errprint, m4wrap): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.

        Pass only macro name to utility functions.
        * m4/m4module.h (m4_bad_argc, m4_numeric_arg): Adjust signature.
        * m4/utility.c (m4_bad_argc, m4_numeric_arg): Adjust
        implementation.
        * m4/macro.c (m4_macro_call): Adjust callers.
        * modules/gnu.c (builtin, debuglen): Likewise.
        * modules/m4.c (ifelse, incr, decr, divert, undivert, m4exit)
        (substr): Likewise.
        * modules/evalparse.c (m4_evaluate): Likewise.
        * modules/stdlib.c (setenv, getpwuid, srand): Likewise.
        * modules/time.c (ctime, gmtime, localtime, mktime, strftime):
        Likewise.

2007-11-23  Eric Blake  <ebb9@byu.net>

        Add macro name to debugfile messages.
        * m4/m4module.h (m4_debug_set_output): Add parameter.
        * m4/debug.c (m4_debug_set_output, set_debug_file): Pass macro
        name through.
        * modules/gnu.c (debugfile): Adjust caller.
        * modules/m4.c (m4exit): Likewise.
        * src/main.c (main): Likewise.

        Factor out handling of macro name in error messages.
        * m4/m4module.h (m4_error, m4_error_at_line, m4_warn)
        (m4_warn_at_line): Add new parameter.
        * m4/utility.c (m4_verror_at_line): New helper method.
        (m4_error, m4_error_at_line, m4_warn, m4_warn_at_line): Add new
        parameter.
        (m4_bad_argc, m4_numeric_arg, m4_parse_truth_arg): All callers
        changed.
        * m4/debug.c: Likewise.
        * m4/input.c: Likewise.
        * m4/macro.c: Likewise.
        * m4/module.c: Likewise.
        * m4/output.c: Likewise.
        * m4/path.c: Likewise.
        * modules/evalparse.c: Likewise.
        * modules/format.c: Likewise.
        * modules/gnu.c: Likewise.
        * modules/load.c: Likewise.
        * modules/m4.c: Likewise.
        * modules/mpeval.c: Likewise.
        * src/freeze.c: Likewise.
        * src/main.c: Likewise.

2007-11-14  Eric Blake  <ebb9@byu.net>

        Handle some defn corner cases differently.
        * doc/m4.texinfo (Defn): Update documentation; although this still
        doesn't match the branch, since it may be changed before 2.0.
        * m4/macro.c (expand_argument): Consistently ignore builtins in
        concatenation contexts.
        * m4/m4private.h (m4__symbol_type): Fix C89 compliance bug.

2007-11-13  Eric Blake  <ebb9@byu.net>

        Note: Patches titled Stage 0 through N form a series of patches
        which decreases the algorithmic complexity of tail recursion in
        macro expansions from O(n^2) to O(n) in both time and memory, then
        performs cleanups, such as handling of embedded NUL, made easier
        by the code refactoring.

        Stage 0: Fix memory leak in tail recursion.
        Free expansion text in the input engine as soon as it is parsed,
        rather than when the recursive expansion completes.
        Memory impact: noticeable improvement, due to reduction from
        O(n^2) to O(n) on recursion.
        Speed impact: minor improvement, due to better memory usage.
        * m4/input.c (pop_input): Add flag parameter and return type.
        (next_char): Adjust caller.
        (m4_push_string_init): Let go of memory earlier.

2007-11-07  Eric Blake  <ebb9@byu.net>

        * tests/macros.at (Rescanning macros): Test more corner cases.

2007-11-06  Eric Blake  <ebb9@byu.net>

        * build-aux/mkstamp: Rename from ltdl/config/mkstamp.

        * Makefile.am (tests/package.m4): Work around bash bug.
        Reported by Ralf Wildenhues.

2007-11-05  Eric Blake  <ebb9@byu.net>

        For consistency with other GNU projects, use build-aux directory.
        * configure.ac (AC_CONFIG_AUX_DIR): Change ltdl/config to
        build-aux.
        * bootstrap (config_aux_dir): Likewise.
        * Makefile.am (config_aux_dir): Likewise.
        * ltdl/m4/gnulib-cache.m4: Use --aux-dir option.

2007-11-02  Eric Blake  <ebb9@byu.net>

        Update some documentation about version control.
        * NEWS: M4 is now stored in git.
        * HACKING: Likewise.
        * README: Likewise.
        * bootstrap: Likewise.
        * commit: Delete, now that CVS commits are no longer necessary.
        * ltdl/config/mailnotify: No longer necessary; git's patch
        generation and mail capability is more powerful.

        Update to recent gnulib changes.
        * ltdl/m4/gnulib-cache.m4: Replace fprintf-posix, vasprintf-posix,
        xprintf, and xvasprintf with xprintf-posix and xvasprintf-posix.

2007-11-01  Eric Blake  <ebb9@byu.net>

        Improve error message when early end of file occurs.
        * doc/m4.texinfo (Macro Arguments, Changequote, Changecom)
        (M4wrap): Adjust to new messages.
        (Improved capitalize): Enhance test.
        * m4/m4private.h (m4__next_token): Adjust prototype.
        * m4/input.c (m4__next_token): Add new parameter, and improve
        error message.
        * m4/macro.c (m4_macro_expand_input, collect_arguments): Adjust
        callers.
        (expand_argument): Likewise, and add parameter.

2007-10-31  Eric Blake  <ebb9@byu.net>

        Test more corner cases.
        * tests/macros.at (Rescanning macros): Beef up test.
        * doc/m4.texinfo (Changecom): Beef up test.
        (Improved foreach): Document alternate foreachq style.
        * examples/foreachq3.m4: New file.
        * examples/loop.m4: New file.
        * Makefile.am (dist_pkgdata_DATA): Distribute them.

2007-10-28  Eric Blake  <ebb9@byu.net>

        More test coverage for autoconf usage patterns.
        * doc/m4.texinfo (Shift): Document cond macro, and add new test.
        * tests/macros.at (Rescanning macros): New test.
        * tests/builtins.at (include): Augment test.

2007-10-28  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am: Adjust getopt handling to latest gnulib layout.

2007-10-27  Eric Blake  <ebb9@byu.net>

        Document one use of changequote(`(',`)').
        * doc/m4.texinfo (Changequote): Add new test, based on recent
        autoconf addition of m4_expand.

2007-10-24  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am (dist_pkgdata_DATA): Add examples/capitalize2.m4.

2007-10-22  Eric Blake  <ebb9@byu.net>

        Never let printf failures go undetected.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        xprintf'.
        * m4/system_.h: Include xprintf.h.
        * m4/debug.c (m4_debug_message_prefix, m4_debug_message): Wrap all
        use of printf, xprintf.
        * m4/input.c [DEBUG_INPUT]: Likewise.
        * m4/module.c [DEBUG_MODULES]: Likewise.
        * m4/output.c (m4_shipout_text, m4_shipout_int)
        (m4_freeze_diversions): Likewise.
        * m4/path.c [DEBUG_INCL]: Likewise.
        * m4/symtab.c [DEBUG_SYM]: Likewise.
        * m4/syntax.c [DEBUG_SYNTAX]: Likewise.
        * modules/modtest.c (export_test): Likewise.
        * src/freeze.c (produce_resyntax_dump, produce_syntax_dump)
        (produce_module_dump, dump_symbol_CB, produce_frozen_state):
        Likewise.
        * src/main.c (usage): Likewise.
        * po/POTFILES.in: Adjust to new file.
        * po/Makevars (XGETTEXT_OPTIONS): Likewise.

2007-10-18  Eric Blake  <ebb9@byu.net>

        Fix 'm4 -F file -t undefined'.
        * src/freeze.c (produce_symbol_dump): Skip trace placeholders.
        * src/freeze.c (dump_symbol_CB): Also skip void symbols.
        * tests/freeze.at (reloading unknown builtin): Test for this bug.
        * m4/m4module.h (m4_symtab_apply): Add parameter.
        * m4/symtab.c (m4_symtab_apply): Ignore trace placeholders when
        requested.
        (m4_symtab_delete, symtab_dump): Adjust callers.
        * modules/m4.c (m4_dump_symbols): Likewise.

2007-10-09  Eric Blake  <ebb9@byu.net>

        Fix regexp regression of 2007-09-29.
        * modules/gnu.c (substitute): Allow NULL buf when no
        subexpressions were present.
        (regexp): Handle \ escapes even with empty regex.
        * doc/m4.texinfo (Regexp, Patsubst): Catch this bug.

        Cache regex compilation for another autoconf speedup.
        * modules/gnu.c (gnu_buf): Replace...
        (REGEX_CACHE_SIZE, regex_cache): ...with new declarations.
        (m4_pattern_buffer): Add fields.
        (m4_regexp_compile): Rename...
        (regexp_compile): ...to this, and drop no_sub parameter.
        Implement caching.
        (M4FINISH_HANDLER): Clean up entire cache.
        (m4_regexp_search): Rename...
        (regex_search): ...to this, adjust to new struct contents, and add
        no_sub parameter.
        (m4_regexp_substitute): Rename...
        (regexp_substitute): ...to this.
        (substitute, patsubst, regexp, renamesyms): Adjust callers.

2007-10-02  Eric Blake  <ebb9@byu.net>

        Document quoting pitfalls in capitalize.
        * doc/m4.texinfo (Patsubst): Use the examples directory.  Also
        document shortfall.
        (Improved capitalize): New node.
        * examples/capitalize.m4: Update to match manual.
        * examples/capitalize2.m4: New file.

2007-10-01  Eric Blake  <ebb9@byu.net>

        Another Autoconf usage pattern optimization.
        * modules/m4.c (m4_index): Optimize search for one byte.
        * doc/m4.texinfo (Index macro, Regexp, Patsubst): Test the new
        code paths.

2007-09-29  Eric Blake  <ebb9@byu.net>

        Optimize for Autoconf usage pattern.
        * modules/gnu.c (regexp, patsubst): Handle empty regex faster.

        * tests/testsuite.at (AT_CHECK_M4): Slight optimization.

2007-09-24  Eric Blake  <ebb9@byu.net>

        Create .gitignore alongside .cvsignore.
        * bootstrap (version control): Update to reflect git usage.

2007-09-13  Eric Blake  <ebb9@byu.net>

        * AUTHORS: Fix typo.

2007-09-12  Gary V. Vaughan  <gary@gnu.org>

        Be consistent about using 'module' for m4_module types and
        'handle' for lt_dlhandle types:

        * m4/m4private.h (m4_symbol_value): Rename handle element to
        method.  Changed all references.
        (VALUE_MODULE, SYMBOL_MODULE): Renamed from VALUE_HANDLE and
        SYMBOL_HANDLE respectively.  Changed all references.
        * m4/m4module.h (M4INIT_HANDLER, M4FINISH_HANDLER): Ditto.
        * m4/builtin.c (m4_builtin_find_by_name)
        (m4_builtin_find_by_func): Use module as the parameter name for
        pointers of type 'm4_module'.
        * m4/module.c (module_remove, m4_get_module_name)
        (install_builtin_table, install_macro_table)
        (m4_module_make_resident, m4__module_next, m4_module_refcount):
        Ditto.
        * src/freeze.c (produce_module_dump): Ditto.
        * m4/input.c (m4_input_block): Rename handle element to method.
        Changed all references.
        * m4/symtab.c (m4__symtab_remove_module_references): Ditto.
        * modules/load.c: Use module as the variable name for pointers
        of type 'm4_module'.
        * modules/m4.c: Ditto.
        * modules/perl.c: Ditto.
        * modules/shadow.c: Ditto.

2007-09-07  Eric Blake  <ebb9@byu.net>

        Add refcount builtin.
        * modules/load.c (refcount): New builtin.
        (m4modules): Use correct type.
        * doc/m4.texinfo (Refcount): New section.
        * m4/m4private.h (struct m4_module): Add refcount member.
        (m4_module_refcount) [NDEBUG]: Add faster accessor macro.
        * m4/module.c (m4_module_load): Add symbols to table on first
        load by m4, regardless of other libltdl loads of same module.
        (m4_module_refcount): Use new struct member, rather than relying
        on libltdl count which might be inflated by unrelated loads.
        (m4__module_interface): Optimize.
        (m4__module_next, m4__module_find): Avoid assertions that could
        trigger with unrelated libltdl loads.
        (m4__module_open): Track m4 load count.
        (m4__module_exit): Only unload what m4 loaded.
        (module_remove): Track m4 unloads.
        * NEWS: Document new builtin.

        More conversion to m4_module*.
        * src/freeze.c (produce_module_dump, dump_symbol_CB)
        (reload_frozen_state): Use correct type.
        * m4/input.c (struct m4_input_block): Likewise.
        * m4/symtab.c (dump_symbol_CB): Likewise.

        * AUTHORS: Simplify, to match libtool and autoconf layout.
        * THANKS: Sync with branch.

2007-09-06  Eric Blake  <ebb9@byu.net>

        Wrap lt_dlhandle in struct m4_module.
        * m4/m4module.h (includes): No longer require clients to know
        about lt_dlhandle.
        (m4_module): New opaque declaration.
        (m4_export): Delete unused type.
        (M4INIT_HANDLER, M4FINISH_HANDLER, m4_module_init_func)
        (m4_module_finish_func, m4_module_load, m4_get_module_name)
        (m4_builtin_find_by_name, m4_builtin_find_by_func): Use new
        wrapper.
        (m4_module_makeresident, m4_module_refcount): New declarations.
        * m4/m4private.h (includes): Move <ltdl.h> here.
        (m4_module): New declaration.  Simple for now, but intended for
        growth.
        (m4__module_open, m4__module_next, m4__module_find)
        (m4__symtab_remove_module_references): Use new wrapper.
        * m4/builtin.c (m4_builtin_find_by_name, m4_builtin_find_by_func):
        Likewise.
        * m4/module.c (m4_get_module_name, m4_module_import)
        (m4_module_load): Likewise.
        (install_builtin_table, install_macro_table): Likewise.  Also,
        change return type since these always returned NULL and no one
        used the result.
        (m4_module_makeresident, m4_module_refcount): New functions.
        (m4_module_unload, m4__module_next, m4__module_find): Use new
        wrapper.
        (m4__module_open): Populate new wrapper, and associate it with the
        lt_dlhandle.
        (m4__module_exit): Use new wrapper.
        (module_remove): Likewise.  Reclaim storage on last use.
        (module_close): Delete, and inline into module_remove.
        * m4/symtab.c (m4__symtab_remove_module_references): Use new
        wrapper.
        * modules/load.c (load_init): Use new API.
        * modules/m4.c (m4_export_table): Kill unused declaration.
        (m4_init): Use new API.
        * modules/shadow.c (shadow_init): Use new API.
        * src/main.c (main): Adjust callers.
        * src/freeze.c (reload_frozen_state): Likewise.
        * tests/modules.at (unload load module): New test.

2007-09-03  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (ltdl/m4/.cvsignore): Add xstrtol module macros.
        * src/m4/.cvsignore: Add xstrtol module sources.

2007-09-03  Gary V. Vaughan  <gary@gnu.org>

        Work around a bug in darwin's awk:

        * bootstrap (func_get_translations): Use $AWK instead of raw
        `awk' so that the user can use an alternative implementation
        if the first awk in PATH doesn't behave as expected.
        (func_get_translations): The first awk script mangles the last
        entry passed to it for at least the awk implementation shipped
        with Darwin 8.10.1.  Capture $3 into a variable too to work-
        around that problem.

2007-08-29  Gary V. Vaughan  <gary@gnu.org>

        As gnulib xstrtol is only used by main, and unconditionally pulls
        in a copy of getopt, undo bootstrap change from 2007-08-11 below,
        and copy the xstrtol code into src/ so that main() can use it
        without pushing the extra code into libm4:

        * bootstrap (src_modules): Add getopt and xstrtol modules.
        * Makefile.am (src_m4_SOURCES): Add xstrtol sources.
        * po/POTFILES.in: Move gnu/xstrtol-error.c to src/xstrtol-error.c.

2007-08-11  Eric Blake  <ebb9@byu.net>

        Another upstream xstrtol change.
        * po/POTFILES.in: Track changes in files containing messages.
        * bootstrap (src_modules): getopt is now pulled into libgnu.a, no
        need to grab it separately.
        * src/main.c (OPT_STR, LONG_OPT_STR, short_opt_str, OPT_STR_INIT):
        No longer needed.
        (size_opt): Adjust to latest xstrtol interface.

2007-08-10  Eric Blake  <ebb9@byu.net>

        Documentation improvements.
        * doc/m4.texinfo (Defn): Resync with branch.
        (Compatibility, Extensions): Sync with branch.

2007-08-07  Eric Blake  <ebb9@byu.net>

        Adjust to gnulib xstrtol changes.
        * src/main.c (size_opt): Adjust signature, so that error strings
        are easier to translate.
        (OPT_STR, LONG_OPT_STR, short_opt_str, OPT_STR_INIT): New macros
        for tracking long options.
        (main): Track which long option was used.
        * tests/options.at (--debuglen, --nesting-limit): Adjust to change
        in error message.
        (deprecated options): Test that --arglength spelling shows up in
        error message.

2007-08-06  Eric Blake  <ebb9@byu.net>

        Normalize all GPL license notices.
        * m4/COPYING.LIB: Delete - libm4 is not distributed under LGPLv2
        at this time.
        * Makefile.am: Update license wording.
        * bootstrap: Likewise.
        * commit: Likewise.
        * configure.ac: Likewise.
        * ltdl/config/mailnotify: Likewise.
        * ltdl/config/mkstamp: Likewise.
        * ltdl/m4/debug.m4: Likewise.
        * ltdl/m4/gmp.m4: Likewise.
        * ltdl/m4/m4-error.m4: Likewise.
        * ltdl/m4/m4-getopt.m4: Likewise.
        * ltdl/m4/m4-gettext.m4: Likewise.
        * ltdl/m4/m4-obstack.m4: Likewise.
        * ltdl/m4/m4-regex.m4: Likewise.
        * ltdl/m4/stackovf.m4: Likewise.
        * m4/builtin.c: Likewise.
        * m4/debug.c: Likewise.
        * m4/hash.c: Likewise.
        * m4/hash.h: Likewise.
        * m4/input.c: Likewise.
        * m4/m4.c: Likewise.
        * m4/m4module.h: Likewise.
        * m4/m4private.h: Likewise.
        * m4/macro.c: Likewise.
        * m4/module.c: Likewise.
        * m4/output.c: Likewise.
        * m4/path.c: Likewise.
        * m4/resyntax.c: Likewise.
        * m4/symtab.c: Likewise.
        * m4/syntax.c: Likewise.
        * m4/system_.h: Likewise.
        * m4/utility.c: Likewise.
        * modules/evalparse.c: Likewise.
        * modules/format.c: Likewise.
        * modules/gnu.c: Likewise.
        * modules/import.c: Likewise.
        * modules/load.c: Likewise.
        * modules/m4.c: Likewise.
        * modules/m4.h: Likewise.
        * modules/modtest.c: Likewise.
        * modules/mpeval.c: Likewise.
        * modules/perl.c: Likewise.
        * modules/shadow.c: Likewise.
        * modules/stdlib.c: Likewise.
        * modules/time.c: Likewise.
        * modules/traditional.c: Likewise.
        * po/Makevars: Likewise.
        * src/freeze.c: Likewise.
        * src/m4.h: Likewise.
        * src/main.c: Likewise.
        * src/stackovf.c: Likewise.
        * tests/builtins.at: Likewise.
        * tests/freeze.at: Likewise.
        * tests/generate.awk: Likewise.
        * tests/m4.in: Likewise.
        * tests/macros.at: Likewise.
        * tests/modules.at: Likewise.
        * tests/options.at: Likewise.
        * tests/others.at: Likewise.
        * tests/stackovf.test: Likewise.
        * tests/testsuite.at: Likewise.

2007-07-22  Eric Blake  <ebb9@byu.net>

        Fix diversions on NetBSD, when fopen(name,"a+") seeks to end.
        * m4/output.c (m4_tmpopen): Explicitly seek to beginning.
        * tests/builtins.at (divert): Enhance test to cover this.
        * THANKS: Update.
        Reported by Thomas Klausner.

2007-07-20  Eric Blake  <ebb9@byu.net>

        Fix 'make distcheck' issues.
        * bootstrap: Add more files that might be more up-to-date in
        gnulib.
        * Makefile.am (EXTRA_DIST): No longer distribute removed diff.
        * config/m4/gnulib-cache.m4: Update to latest gnulib.

2007-07-16  Eric Blake  <ebb9@byu.net>

        * po/POTFILES.in: Track recent translation additions from gnulib
        updates.

2007-07-14  Eric Blake  <ebb9@byu.net>

        Reflect upstream license .texi changes.
        * doc/m4.texinfo (Copying): Rename node...
        (GNU General Public License): ...to this.
        (GNU Free Documentation License): Adjust node location.
        * local/doc/gpl-3.0.texi.diff: Remove file.

2007-07-10  Eric Blake  <ebb9@byu.net>

        Upgrade to GPLv3, and document 1.4.10.
        * bootstrap: Adjust to GPLv3.
        (func_update): Port from branch.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool
        --local-dir=local --import gpl-3.0'.
        * doc/m4.texinfo (History): Mention 1.4.11.
        (Copying This Package): New appendix.
        * NEWS: Document 1.4.10.
        * local/doc/gpl-3.0.texi.diff: New file.
        * Makefile.am: Update license.
        (doc_m4_TEXINFOS, EXTRA_DIST): Distribute additions.
        * commit: Update license.
        * configure.ac: Likewise.
        * ltdl/config/mailnotify: Likewise.
        * ltdl/config/mkstamp: Likewise.
        * ltdl/m4/debug.m4: Likewise.
        * ltdl/m4/gmp.m4: Likewise.
        * ltdl/m4/m4-error.m4: Likewise.
        * ltdl/m4/m4-getopt.m4: Likewise.
        * ltdl/m4/m4-gettext.m4: Likewise.
        * ltdl/m4/m4-obstack.m4: Likewise.
        * ltdl/m4/m4-regex.m4: Likewise.
        * ltdl/m4/stackovf.m4: Likewise.
        * m4/builtin.c: Likewise.
        * m4/debug.c: Likewise.
        * m4/hash.c: Likewise.
        * m4/hash.h: Likewise.
        * m4/input.c: Likewise.
        * m4/m4.c: Likewise.
        * m4/m4module.h: Likewise.
        * m4/m4private.h: Likewise.
        * m4/macro.c: Likewise.
        * m4/module.c: Likewise.
        * m4/output.c: Likewise.
        * m4/path.c: Likewise.
        * m4/resyntax.c: Likewise.
        * m4/symtab.c: Likewise.
        * m4/syntax.c: Likewise.
        * m4/system_.h: Likewise.
        * m4/utility.c: Likewise.
        * modules/evalparse.c: Likewise.
        * modules/format.c: Likewise.
        * modules/gnu.c: Likewise.
        * modules/import.c: Likewise.
        * modules/load.c: Likewise.
        * modules/m4.c: Likewise.
        * modules/m4.h: Likewise.
        * modules/modtest.c: Likewise.
        * modules/mpeval.c: Likewise.
        * modules/perl.c: Likewise.
        * modules/shadow.c: Likewise.
        * modules/stdlib.c: Likewise.
        * modules/time.c: Likewise.
        * modules/traditional.c: Likewise.
        * po/Makevars: Likewise.
        * src/freeze.c: Likewise.
        * src/m4.h: Likewise.
        * src/main.c: Likewise.
        * src/stackovf.c: Likewise.
        * tests/builtins.at: Likewise.
        * tests/freeze.at: Likewise.
        * tests/generate.awk: Likewise.
        * tests/m4.in: Likewise.
        * tests/macros.at: Likewise.
        * tests/modules.at: Likewise.
        * tests/options.at: Likewise.
        * tests/others.at: Likewise.
        * tests/stackovf.test: Likewise.
        * tests/testsuite.at: Likewise.

2007-07-09  Eric Blake  <ebb9@byu.net>

        * modules/format.c (format): Avoid undefined behavior with %c.

2007-07-01  Gary V. Vaughan  <gary@gnu.org>

        The translation project has moved.
        * bootstrap (func_get_translations): Use the new translation
        project url.
        (TP_URL): Removed.

2007-06-26  Karl Berry  <karl@freefriends.org>  (tiny change)

        Match Free Software Directory categories.
        * doc/m4.texinfo (dircategory): Update.

2007-05-31  Eric Blake  <ebb9@byu.net>

        Add extension to divert builtin.
        * modules/m4.c (builtin_divert): Immediately divert second
        argument.
        * m4/output.c (m4_output_text): Allow 0 length.  Fixes regression
        from two days ago.
        (m4_shipout_text): Short-circuit on zero length.
        * tests/freeze.at (loading format 2): Expand test to catch
        regression.  Also check out-of-range version.
        * tests/builtins.at (divert): Expand test to check corner cases
        of extension.
        * NEWS: Document the extension.
        Reported by Daniel Richard G.

2007-05-30  Eric Blake  <ebb9@byu.net>

        Port format improvements from branch.
        * doc/m4.texinfo (History): Mention upcoming 1.4.10 release.
        (Format): Enhance section.
        * modules/format.c (format): Accept %'hhd, and issue warnings on
        unrecognized specifiers.
        * modules/gnu.c (builtin_format): Adjust how format is called.

2007-05-28  Eric Blake  <ebb9@byu.net>

        * tests/options.at (--syncoutput): Add xfailed test.

        Fix sync line interaction with multiline comments.
        * doc/m4.texinfo (Preprocessor features): Improve documentation.
        (Syncoutput): Improve testsuite.
        (Incompatibilities): Add testcase, and document bug.
        * src/freeze.c (reload_frozen_state): Don't interfere with
        synclines when reloading state.
        * m4/input.c (m4__next_token): Report line where multiline tokens
        start.
        * m4/m4private.h (m4__token_type): Add parameter.
        * m4/m4module.h (m4_output_text): Export.
        (m4_shipout_text): Add parameter.
        * src/macro.c (m4_macro_expand_input, expand_token)
        (expand_argument): Adjust callers so that line is passed from
        input to output.
        * m4/output.c (output_text): Rename...
        (m4_output_text): ...to this, and export.
        (m4_insert_file, insert_diversion_helper): Update callers.
        (m4_shipout_text): Take new parameter for start line of token.
        Output at most one syncline per token.
        Reported by Sergey Poznyakoff.

        Fix large diversion corner cases.
        * tests/freeze.at (large diversion): New test.
        * m4/output.c (m4_tmpfile, m4_tmpopen): Simplify use of errno.
        (make_room_for): Use NULL, not 0, for pointers.
        (m4_freeze_diversions): Allow freezing large diversions.
        (insert_diversion_helper): Avoid using rewind.

        Also run gnulib unit tests during make check.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool
        --tests-base=tests/gnu --with-tests'.
        * configure.ac (AC_CONFIG_FILES): Build tests/gnu testdir.
        * Makefile.am (SUBDIRS): Run gnulib tests before ours.

2007-05-25  Eric Blake  <ebb9@byu.net>

        * m4/system_.h: Include <stdint.h>, for intmax_t.
        * THANKS: Update.
        Reported by Daniel Richard G.

2007-05-24  Eric Blake  <ebb9@byu.net>

        Provide consistent shift semantics regardless of hardware.
        * modules/m4.c (numb_lshift, numb_rshift, numb_urshift): Mask
        before shifting.
        (number, unumber): Always use [u]intmax_t.
        Reported by Gary V. Vaughan.

        Support POSIX flush semantics on all platforms.
        * modules/m4.c (m4_sysval_flush): Rely on gnulib.
        * ltdl/m4/gnulib-cache.m4: Fix typo in previous commit.

        Work around cygwin and mingw fseeko bugs.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        fseeko'.
        * modules/m4.c (m4_sysval_flush): Prefer fseeko over fseek.

2007-04-25  Eric Blake  <ebb9@byu.net>

        Test that regression in 1.4.9's eval doesn't recur.
        * doc/m4.texinfo (Eval): Check negative division.
        * THANKS: Update.

2007-04-12  Eric Blake  <ebb9@byu.net>

        Allow for running test in sticky or setgid directory.
        * tests/builtins.at (mkdtemp): Adjust test.

        Don't test for broken sed too soon.
        * tests/others.at (stdin seekable): Rearrange subtests.

        Work around 'stdin seekable' shortcoming on glibc.
        * ltdl/m4/gnulib-cache.m4: Use closein instead of closeout.
        * tests/others.at (stdin closed): Adjust to new output.
        * src/main.c (process_file): No need to return anything.
        (main): Use close_stdin instead of close_stdout.
        Reported by Ralf Wildenhues.

        Enable autobuild usage.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        autobuild'.
        * configure.ac (AB_INIT): Output autobuild information.

2007-04-11  Eric Blake  <ebb9@byu.net>

        Address testsuite shortcoming in 'stdout full' on glibc.
        * tests/others.at (stdout full): Adjust expected output when more
        than 1k text is printed to /dev/full.
        Reported by Ralf Wildenhues.

2007-04-10  Eric Blake  <ebb9@byu.net>

        * tests/macros.at (Arity and defn): Fix quoting.

2007-04-09  Eric Blake  <ebb9@byu.net>

        Address failure of 'seekable stdin' on Mac OS X.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        fflush'.

2007-04-07  Eric Blake  <ebb9@byu.net>

        Include <config.h> first in all C files, and not in headers.
        Fixes regression for --disable-assert builds from 2007-04-02.
        * src/m4.h (includes): Don't include config.h here.
        * m4/m4private.h (includes): Likewise.
        * m4/builtin.c: Include config.h before anything else.
        * m4/debug.c: Likewise.
        * m4/hash.c: Likewise.
        * m4/input.c: Likewise.
        * m4/m4.c: Likewise.
        * m4/macro.c: Likewise.
        * m4/module.c: Likewise.
        * m4/symtab.c: Likewise.
        * m4/syntax.c: Likewise.
        * m4/utility.c: Likewise.
        * src/freeze.c: Likewise.
        * src/stackovf.c: Likewise.

2007-04-03  Eric Blake  <ebb9@byu.net>

        * modules/m4.c (numb_ratio, numb_divide, numb_modulo): Avoid
        SIGFPE on x86 architectures.
        Reported by Ralf Wildenhues.

2007-04-02  Eric Blake  <ebb9@byu.net>

        Fix warnings from last commit.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        fprintf-posix sprintf-posix'.
        * m4/macro.c (expand_macro, trace_format): Use correct specifier
        for size_t.
        (process_macro): Avoid negative array index.
        * src/freeze.c (produce_resyntax_dump, produce_module_dump)
        (dump_symbol_CB, produce_frozen_state): Use correct specifier for
        size_t.

2007-04-02  Gary V. Vaughan  <gary@gnu.org>

        Get rid of the last 'differs in signedness' compiler warnings:

        * m4/macro.c (process_macro): m4_get_symbol_value_text() returns
        a regular 'char *', so variables to store the return address,
        and iterate through it should be regular 'char *' too.
        * m4/input.c (m4_input_block): The start and current members of
        the string part of this union store regular 'char *' types, so
        they should be regular 'char *' types too.

2007-04-02  Gary V. Vaughan  <gary@gnu.org>

        M4 was designed to have a small number of header files defining
        the interfaces to several source files each.  Keeping this in
        mind allows us to tidy things up considerably.  Having done this,
        it becomes clear that some of the installed headers reference
        other headers which are not installed (but that's another patch):

        * m4/m4private.h (stdio--.h, stdlib--.h, unistd--.h): Moved from
        here...
        * m4/system_.h (gnu/stdio--.h, gnu/stdlib--.h, gnu/unistd--.h):
        ...to here, so client modules can benefit too.
        (assert.h, errno.h, limits.h, sys/stat.h): Include one here at the
        lowest level to save doing it multiple times elsewhere.
        * m4/debug.c (stdio.h): Removed.  The portable <gnu/stdio--.h>
        is already included via m4private.h.
        * modules/time.c (stdio.h): Ditto.
        * modules/gnu.c (stdlib.h): Ditto resp <gnu/stdlib--.h>.
        * modules/stdlib.c (stdlib.h, unistd.h): Ditto resp <gnu/stdlib--.h>
        and <gnu/unistd--.h>,
        * m4/m4private.h (m4module.h): Use angle brackets for an installed
        file.
        * m4/hash.h (system.h): Ditto.
        * modules/gnu.c (progname.h): Removed.
        * src/freeze.c (m4/system.h, m4private.h): Already included vi m4.h.
        * m4/m4private.h (assert.h, errno.h): Already included via
        m4/m4module.h.
        * m4/input.c (ctype.h): Ditto.
        * m4/module.c (ltdl.h): Ditto.
        * m4/output.c (errno.h, limits.h, stdio.h, sys/types.h, sys/stat.h)
        (unistd.h): Ditto.
        * m4/path.c (config.h, stdlib.h): Ditto.
        * m4/utility.c (config.h): Ditto.
        * modules/evalparse.c (assert.h, ctype.h): Ditto.
        * modules/gnu.c (assert.h, ctype.h, errno.h): Ditto.
        * modules/import.c (assert.h): Ditto.
        * modules/m4.c (assert.h, errno.h): Ditto.
        * modules/modtest.c (assert.h): Ditto.
        * modules/stdlib.c (sys/types.h): DittAo.
        * src/m4.h (ctype.h, errno.h, string.h, sys/types.h, ltdl.h):
        Ditto.
        * src/stackovf.c (assert.h): Ditto.
        * modules/gnu.c (m4/m4module.h, m4private.h): Build using the faster
        private interfaces when NDEBUG is defined.
        * modules/import.c (m4/m4module.h, m4private.h): Ditto.
        * modules/load.c (m4/m4module.h, m4private.h): Ditto.
        * modules/m4.c (m4/m4module.h, m4private.h): Ditto.
        * modules/modtest.c (m4/m4module.h, m4private.h): Ditto.
        * modules/mpeval.c (m4/m4module.h, m4private.h): Ditto.
        * modules/perl.c (m4/m4module.h, m4private.h): Ditto.
        * modules/shadow.c (m4/m4module.h, m4private.h): Ditto.
        * modules/time.c (m4/m4module.h, m4private.h): Ditto.
        * modules/traditional.c (m4/m4module.h, m4private.h): Ditto.
        * src/m4.h (locale.h): Moved from here...
        * src/main.h: ...to here.
        (m4private.h): Already included via m4.h.
        * src/stackovf.c (m4private.h): Ditto.

2007-03-28  Gary V. Vaughan  <gary@gnu.org>

        * Makefile.am (stamp-vcl): Removed.
        (CONFIG_STATUS_DEPENDENCIES): Depend directly on ChangeLog.

2007-03-28  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage): Improve note to TRANSLATORS.
        * m4/system_.h (EXIT_FAILURE): Reflect gnulib changes.

        * tests/builtins.at (__m4_version__): Fix bug when TIMESTAMP is
        empty.

2007-03-24  Eric Blake  <ebb9@byu.net>

        * m4/output.c (m4_output_init): Update to latest gnulib.
        * bootstrap (ltdl/m4/.cvsignore): No longer track generated
        .cvsignore in CVS.
        * NEWS: Reflect release of 1.4.9.
        * THANKS: Update.

2007-03-07  Eric Blake  <ebb9@byu.net>

        * AUTHORS: Update

        Exercise gnulib's new POSIX *printf modules.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        vasprintf-posix'.
        * modules/format.c (format): Support %a and %A.
        * doc/m4.texinfo (Format): Test this addition.
        * NEWS: Document this addition.

2007-03-03  Eric Blake  <ebb9@byu.net>

        * m4/input.c (m4__next_token): Fix synclines when in batch mode.
        * doc/m4.texinfo (M4exit): Synch another section.
        (Syncoutput): Make similar to other sections.

2007-03-01  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo: Improve the indices.
        (Concept index): Rearrange to be last.
        (Sysval): Merge from branch.

        * doc/m4.texinfo (Syscmd, Esyscmd): Merge more doc sections.

2007-02-28  Eric Blake  <ebb9@byu.net>

        POSIX XCU ERN 137 was approved.
        * modules/mpeval.c (numb_extension): Delete.
        * modules/m4.c (numb_extension): Likewise.
        * modules/evalparse.c (comma_term, condition_term): Always
        implement ?: and , operators.
        * m4/symtab.c: Update comment to match reality.
        * src/freeze.c (produce_frozen_state, reload_frozen_state): Avoid
        dereferencing context directly when accessor exists.
        * src/main.c (usage): Prefer GNU_M4 over EMACS.
        (struct macro_definition): Rename...
        (struct deferred): ...to match usage.  All uses changed.
        * doc/m4.texinfo (Eval): Document this change.
        (Operation modes, Changeresyntax): Fix wording to prefer GNU_M4
        over emacs.
        (Preprocessor features, Changesyntax): Fix inaccuracies.
        * NEWS: Import branch NEWS items for 1.4.x series.  Document
        change in eval.

        POSIX XCU ERN 118 was approved.
        * modules/m4.c (define): Kill posixly_correct distinction in
        define behavior, since POSIX says GNU behavior complies.
        * tests/builtins.at (define): Restore original semantics.
        * doc/m4.texinfo (Pushdef): Document portability issues with
        define.
        (Incompatibilities): Clean up wording of what POSIX requires.
        * NEWS: Document this.

2007-02-26  Eric Blake  <ebb9@byu.net>

        Re-enable clean bootstrap on cygwin.
        * Makefile.am (AM_LDFLAGS): For now, export all symbols from
        modules, since otherwise we run afoul of current libtool
        limitations on cygwin and mingw.

2007-02-25  M. Levinson  <levinsm@users.sourceforge.net>  (tiny change)

        * src/freeze.c (reload_frozen_state): Avoid dereferencing freed
        memory.  Fixes regression introduced 2007-01-20.

2007-02-25  Eric Blake  <ebb9@byu.net>

        * tests/freeze.at (loading format 2): Augment test to catch
        regression introduced on 2007-01-20.
        * THANKS: Update.
        Reported by M. Levinson.

        * m4/system_.h (includes, EXIT_SUCCESS, EXIT_FAILURE): Adjust to
        latest gnulib.

2007-02-05  Eric Blake  <ebb9@byu.net>

        * tests/options.at (--fatal-warnings): New test.
        * tests/others.at (stdin seekable): Exit on error.
        * m4/m4private.h (M4_OPT_WARN_EXIT_BIT): New bit.
        (m4_get_warnings_exit_opt): Access it.
        * m4/m4module.h (m4_context_opt_bit_table): Access it.
        * m4/utility.c (m4_error, m4_error_at_line): Only force an exit
        on -EE.
        (m4_warn, m4_warn_at_line): Change exit status on -E, and force
        exit on -EE.
        * src/m4.c (usage): Document new -E behavior.
        (main): Make -E an additive option.
        * doc/m4.texinfo (Operation modes): Document the change.
        Reported by Ralf Wildenhues.

        * tests/others.at (stdin seekable): Fix bug in test.
        * ltdl/m4/gnulib-cache.m4: Gnulib module strstr no longer exists.

        * m4/input.c (struct m4_input_block): Remove unused field traced.

2007-02-03  Eric Blake  <ebb9@byu.net>
        and Bruno Haible  <bruno@clisp.org>  (tiny change)

        * doc/m4.texinfo (Input processing, Quoting Arguments): Beef up
        the examples.
        Reported by Bruno Haible.

2007-01-31  Eric Blake  <ebb9@byu.net>

        * m4/resyntax.c (m4_regexp_syntax_encode): Detect allocation
        failure.

2007-01-26  Eric Blake  <ebb9@byu.net>

        * m4/symtab.c (includes): Adjust to latest gnulib.
        * modules/m4.c (includes): Likewise.

2007-01-23  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (M4_SYNTAX_ASSIGN): Delete this unused
        extension to make enough room.
        (M4_SYNTAX_IGNORE): Change value to zero, since the (commented)
        code in input.c special cases this category.
        (M4_SYNTAX_LBRACE, M4_SYNTAX_RBRACE): New values in preparation
        for define(eleventh,${11}) extension.
        * m4/syntax.c: Update comments accordingly.
        (m4_syntax_create, m4_syntax_code): Handle { and }.
        * m4/input.c (m4__next_token): Likewise.
        * src/freeze.c (produce_frozen_state): Support new categories.
        (reload_frozen_state): When loading version 1, disable syntax
        features not present in 1.4.x.
        * tests/freeze.at: Sort and rename existing tests.
        (loading format 1): Ensure we don't break v1 frozen files that
        used raw ${.
        (loading format 2, reloading changecom, reloading changesyntax):
        New tests.
        * doc/m4.texinfo (Changesyntax, Frozen file format 1): Document
        the new syntax categories.
        (Arguments): Update the FIXME comment.
        (M4wrap): Merge examples from branch, before worrying about fixing
        m4wrap to obey POSIX.
        (Using frozen files): Start merging from branch.
        * NEWS: Update.

2007-01-20  Eric Blake  <ebb9@byu.net>

        * src/freeze.c (produce_char_dump): Delete.  Replace with...
        (produce_mem_dump): ...this new function, to encode more strings.
        Also make the coding easier to read and slightly more compact.
        (produce_syntax_dump): Only dump non-default syntax codes.
        (produce_module_dump, dump_symbol_CB, produce_frozen_state):
        Encode non-ASCII characters in user-supplied strings.
        (GET_STRING): Accept escape sequences in version 2.
        * NEWS: Document this change.
        * TODO: Update.

2007-01-16  Eric Blake  <ebb9@byu.net>

        Port patch from branch for stack overflow detection on BSD/OS.
        * ltdl/m4/stackovf.m4 (M4_SYS_STACKOVF): Check for stack_t.ss_sp.
        * src/stackovf.c (setup_stackovf_trap) [HAVE_SIGALTSTACK &&
        ! HAVE_STACK_T_SS_SP]: Use this check.
        Reported by Chris McGuire.

2007-01-15  Eric Blake  <ebb9@byu.net>

        * tests/builtins.at (__m4_version__): New test.
        * modules/traditional.c (m4_macro_table): Provide windows and os2
        macros, as appropriate.  Add __traditional__ macro.
        * modules/mpeval.c (m4_macro_table): Name the macro __mpeval__,
        not __gmp__, to match module name.
        * modules/load.c (m4_macro_table): Name the macro __load__, not
        __modules__, to match module name.
        * doc/m4.texinfo (History, Shell commands, Platform macros): Merge
        from the branch.
        (Standard Modules): Improve wording.
        (Incompatibilities): Move platform macros into their own node.
        (Load, Unload): Use actual examples.
        * NEWS: Document this change.
        * THANKS: Update.

2007-01-13  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Mpeval): Add tests.
        * tests/testsuite.at (AT_CHECK_GMP): New filter, factored from...
        * tests/builtins.at (gmp): ...here.  Rename test to...
        (mpeval): ...this.
        * tests/generate.awk (new_test): Filter out mpeval tests when gmp
        is not available.
        * m4/m4module.h (m4_get_no_gnu_extensions_opt): Merge
        no_gnu_extensions with posixly_correct_opt, since they were set in
        sync.
        * m4/m4private.h (struct m4): Remove no_gnu_extensions.
        * src/main.c (main): Update caller.
        * src/freeze.c (reload_frozen_state): Likewise.
        * modules/m4.c (m4wrap): Likewise.

2007-01-12  Eric Blake  <ebb9@byu.net>

        * m4/syntax.c (m4_set_comment): XCU ERN 131 was approved by
        POSIX, so update the comment.
        * doc/m4.texinfo (Inhibiting Invocation): XCU ERN 130 was
        approved by POSIX, so we can always have blind macros, even when
        POSIXLY_CORRECT.
        (Ifelse): Mention the term `blind builtin'.

2007-01-08  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * doc/m4.texinfo: Fix a couple of typos.

2007-01-08  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Update for new year.
        * ltdl/m4/gmp.m4 (_M4_LIB_GMP): Cover all error cases.
        Reported by Ralf Wildenhues.

2007-01-06  Eric Blake  <ebb9@byu.net>

        * m4/m4private.h (to_uchar): Move...
        * m4/m4module.h: here, so modules can use it.
        * src/main.c (usage, long_options): Support --posix as a synonym
        for --traditional.
        * modules/m4.c (numb_invert): Detect unsupported x**-y.
        (numb_incr, numb_urshift, numb_extension): New macros.
        (numb_obstack): Port patch from branch to support radix 1 output.
        * modules/mpeval.c (numb_obstack): Use \ for ratios.
        (numb_incr, numb_urshift, numb_extension): New macros.
        (mpq2mpz): Warn rather than error.
        * modules/evalparse.c (URSHIFT, NEGATIVE_EXPONENT): New
        enumerators.
        (eval_error): Rearrange, so that all ignorable errors are less
        than SYNTAX_ERROR.
        (eval_text, last_text): Obey C++ type safety rules.
        (numb_pow): Change return type.
        (exp_term): Adjust caller.
        (m4_evaluate): Fail on bad exponent.
        (logical_or_term, logical_and_term): Ignore failed ** in short
        circuit.
        (eval_lex): Fix typos when detecting <<= and >>=.  Use \ instead
        of : for ratio.  Support >>>, ,, and ?:.  Port patch from branch
        to parse radix 1 numbers.
        (condition_term, comma_term): New parse functions.
        (shift_term): Support >>>.
        (m4_evaluate): Port patch from branch to output radix 1 numbers.
        Warn instead of error for most parse problems.
        * doc/m4.texinfo (Limits control, Eval): Document these changes.
        * NEWS: Document new operators and new command line option.

2007-01-04  Eric Blake  <ebb9@byu.net>

        * configure.ac (AC_SYS_LARGEFILE): Guarantee large file support.

2007-01-03  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Format, Incr): More merges.
        (Eval): Ensure C precedence rules are met.
        * modules/evalparse.c (BADOP, INVALID_OPERATOR): New enumerators.
        (not_term, logical_not_term): Delete; these are same precedence
        as other unary operators.
        (equality_term): New; these are lower precedence than relational
        operators.
        (eval_lex, simple_term, m4_evaluate): Recognize forbidden C
        operators for better error messages.
        (logical_or_term, logical_and_term): Short-circuit out the error
        of division by zero.
        (unary_term): Allow consecutive unary operators.
        * modules/m4.c (int2numb, numb2int): Delete; these potentially
        truncate bits.
        (numb_not, numb_eor, numb_ior, numb_and): Update callers.
        * modules/mpeval.c (reduce1, reduce2): Protect macros better.
        * NEWS: Document this change.

2006-12-27  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Substr, Patsubst): Merge more sections from the
        branch.
        * modules/m4.c (substr): Merge from branch.

2006-12-26  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Changesyntax): Check for regressions with
        changesyntax(W=...).

2006-12-22  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_set_syntax): Change signature.
        * modules/gnu.c (m4_resyntax_encode_safe): Reduce error to
        warning.
        (changesyntax): Likewise, and update caller.
        * m4/m4private.h (m4_syntax_table): Add orig member.
        * m4/syntax.c (m4_set_quotes, m4_set_comment): Merge from branch.
        Don't set is_single_quotes and is_single_comments when the begin
        character is shadowed by another syntax type.
        (m4_syntax_create): Populate default syntax table.
        (add_syntax_attribute): Don't lose quote assignment.
        (remove_syntax_attribute): Only allow removing rquote or ecomm.
        (add_syntax_set, subtract_syntax_set, set_syntax_set)
        (reset_syntax_set): New helper routines.
        (m4_set_syntax): Alter semantics - NUL key reverts entire syntax
        to default, and empty chars reverts that key to default.
        (check_is_single_quotes, check_is_single_comments): New helper
        routines.
        * modules/m4.c (changecom): Merge from branch.
        * m4/input.c (m4__next_token): Rearrange token recognition order
        to macro, quote, comment, in order to match traditional
        implementations.
        * src/freeze.c (reload_frozen_state): Update caller.
        * doc/m4.texinfo (Changequote, Changecom): Merge from branch, with
        modifications.
        (Changeresyntax): Revise to match style of surrounding sections
        and add more examples.
        (Changesyntax): Likewise, and update to new semantics.
        * NEWS: Document this change.

        * doc/m4.texinfo (Operation modes): Avoid underfull hbox.
        (M4wrap, Eval, Errprint): Fix typos.
        (Divnum): Not necessary to redivert in example.

2006-12-21  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Len, Index macro, Regexp): More section merging
        from branch.

2006-12-19  Eric Blake  <ebb9@byu.net>

        * modules/m4.h (m4_sysval_flush_func): Adjust prototype.
        * modules/m4.c (m4_sysval_flush): Add parameter, so that m4exit
        can track write errors without all other callers warning multiple
        times.
        (sysval_flush_helper): New function.
        (dumpdef, syscmd, errprint, m4exit): Adjust callers.
        * modules/gnu.c (esyscmd): Likewise.
        * tests/others.at (stdout closed, stdout full): Error message
        update.

2006-12-16  Eric Blake  <ebb9@byu.net>

        * src/main.c: Fix missing include.

        * src/main.c (main): Check for errors when closing stdin.
        * modules/m4.c (m4exit): Missed part of previous patch: flush
        stdin before a successful exit.
        Reported by Ralf Wildenhues.

2006-12-14  Eric Blake  <ebb9@byu.net>

        * modules/m4.c (m4_sysval_flush): Flush stdin before exiting, as
        required by POSIX.
        * tests/others.at (stdin seekable): New test.

2006-12-09  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * doc/m4.texinfo: Fix some typos.

2006-12-04  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Undivert, Divnum, Cleardivert): Merge more doc
        sections.
        (Modules): Make style consistent.

2006-11-16  Eric Blake  <ebb9@byu.net>

        * bootstrap: Relax m4 requirement, thanks to...
        * configure.ac (Gettext support): ...this workaround to the 1.4.4
        bug.  Undoes restriction added on 2006-11-09.

        * tests/builtins.at (esyscmd, syscmd): Redo, since spilled
        diversions are now closed when not active.
        (divert): Remove check now in the manual.
        * tests/others.at (stderr closed): Likewise.
        (stdout closed): Add a check.
        * doc/m4.texinfo (Include, Search Path, Diversions, Divert): Sync
        more docs with branch.

2006-11-14  Eric Blake  <ebb9@byu.net>

        Remerge sparse diversion handling from branch.
        * ltdl/m4/gnulib-cache.m4: Replace avltree-list with
        avltree-oset.
        * m4/output.c (diversion_table): Change type to gl_oset_t.
        (m4_output_init, m4_output_exit, cleanup_tmpfile, make_room_for)
        (m4_make_diversion, insert_diversion_helper, m4_insert_diversion)
        (m4_undivert_all, m4_freeze_diversions): Adjust all callers.
        (div0, diversion_storage): New variables.
        (diversions, equal_diversion_CB): Deleted.
        (threshold_diversion_CB): New callback.
        (m4_tmpname, m4_tmpopen, m4_tmpclose, m4_tmpremove): New
        functions.
        (m4_tmpfile): Move cloexec action here.

        * m4/resyntax.c (m4_regexp_syntax_encode): Avoid bug with signed
        char.

2006-11-13  Eric Blake  <ebb9@byu.net>

        Add several new command line options.
        * src/main.c (usage): Update.
        (OPTSTRING, long_options): Add --pushdef, --popdef, --gnu,
        --traceon, --traceoff, --syncoutput, --warnings, --unload-module.
        Make --regexp-syntax argument optional.
        (main): Support new options.  Fix regression in interactive
        behavior from Nov 8.
        * m4/m4private.h (M4_OPT_SYNCOUTPUT_BIT): Rename from
        M4_OPT_SYNC_OUTPUT_BIT.
        * m4/m4module.h (m4_context_opt_bit_table): Rename sync_output to
        syncoutput, to match option.
        (m4_parse_truth_arg): New prototype.
        * m4/utility.c (m4_parse_truth_arg): Implement it.
        * m4/output.c (m4_shipout_text): Adjust sync_output caller.
        * modules/gnu.c (syncoutput): Adjust sync_output caller, and use
        m4_parse_truth_arg.
        * doc/m4.texinfo (Operation modes, Dynamic loading features)
        (Preprocessor features, Limits control, Debugging options)
        (Command line files): Update documentation.
        * tests/builtins.at (mkstemp): Simplify.
        * tests/macros.at (Command line pushdef): New test.
        (Command line define): Improve.
        * tests/options.at (--traceon and --traceoff, --syncoutput): New
        tests.
        (POSIXLY_CORRECT): Likewise.
        (deprecated options): Augment.
        (--regexp-syntax): Update, now that -r takes optional arg.
        * NEWS: Reformat.  Document new options.

2006-11-11  Eric Blake  <ebb9@byu.net>

        One step closer to allowing C++ compilation - don't blindly
        convert between char* and unsigned char*.
        * m4/m4module.h (m4_set_syntax): Change signature.
        * m4/m4private.h (m4_string): Use signed char.
        (m4_get_syntax_lquote, m4_get_syntax_rquote, m4_get_syntax_bcomm)
        (m4_get_syntax_ecomm): No longer a need to cast.
        * m4/syntax.c (m4_set_syntax, m4_syntax_create, m4_set_quotes):
        Reflect this change.
        * m4/macro.c (expand_argument): Simplify.
        (expand_token): Use proper type.
        * src/freeze.c (reload_frozen_state): Likewise.
        * m4/input.c (MATCH, match_input): Likewise.
        * modules/m4.c (translit): Likewise.
        * modules/gnu.c (substitute): Simplify.

        * m4/macro.c (trace_format): Use canonical type name.
        * m4/output.c (m4_freeze_diversions): Likewise.
        * src/freeze.c (produce_module_dump, dump_symbol_CB)
        (produce_frozen_state): Likewise.
        * m4/m4private.h (to_uchar): Grab from branch.
        * m4/input.c (string_peek, string_read): Use it.
        * m4/utility.c (skip_space): Likewise.
        * src/main.c (main): Likewise.
        * doc/m4.texinfo (Translit): Remerge from branch.
        * tests/builtins.at (translit): Test 8-bit range.
        * modules/m4.c (m4_expand_ranges): Merge from branch.

2006-11-09  Eric Blake  <ebb9@byu.net>

        * bootstrap: Validate that installed M4 is powerful enough.
        Reported by Gary V. Vaughan, analyzed by Stepan Kasal.

2006-11-08  Eric Blake  <ebb9@byu.net>

        Merge deferred handling of -D option from branch.
        * doc/m4.texinfo (Debugging options, Preprocessor features)
        (Dynamic loading features, Operation modes, Invoking m4):
        Document this change.
        * src/main.c (OPTSTRING): Specify in-order processing.
        (process_file): New function.
        (main): Use it to interleave files and deferred options.
        * tests/macros.at (Command line define): New test.
        * tests/generate.awk: Allow '@comment file' as first example
        within a node.
        * tests/options.at (option grouping): Update to reflect actual
        POSIX semantics.
        (file names): New test.

2006-11-07  Eric Blake  <ebb9@byu.net>

        * m4/output.c (cleanup_tmpfile, m4_insert_diversion_helper): Check
        for failure.

        * tests/builtins.at (m4exit): New test; failed on cygwin before
        this patch.
        * m4/output.c (cleanup_tmpfile): Close files before removing
        directory.
        (make_room_for, m4_output_exit): Ensure that atexit handler
        invoked from m4_error sees consistent state.

        * doc/m4.texinfo (Errprint): Merge another doc node.
        * tests/builtins.at (dumpdef, errprint): New tests.
        * modules/m4.c (errprint): Merge from branch: flush before
        printing to stderr.

2006-11-02  Eric Blake  <ebb9@byu.net>

        * bootstrap: Update bootstrap requirement wording.
        Reported by Bruno Haible.

2006-10-31  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        strstr'.
        * doc/m4.texinfo (Translit): Merge from branch.
        * modules/m4.c (divert, substr): Ignore excess arguments.
        (index, translit): Merge from branch.
        * tests/builtins.at (translit): Add a test.

2006-10-30  Eric Blake  <ebb9@byu.net>

        * m4/m4private.h (m4_get_symbol_value_module): Delete accidental
        checkin.
        * m4/symtab.c (m4_get_symbol_value_module): Likewise.

        * modules/m4.c (m4_make_temp): Make safe across libtool.
        * m4/symtab.c (dump_symbol_CB) [DEBUG_SYM]: Avoid warnings.
        * configure.ac (--with-modules): Accomodate changed module
        location when doing './configure --enable-debug'.

2006-10-28  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        config-h.'

2006-10-27  Eric Blake  <ebb9@byu.net>

        * bootstrap (gnulib): No longer a need to patch after gnulib-tool
        --update.
        * configure.ac (AM_GNU_GETTEXT_VERSION): Bump requirement to
        0.16, since 0.15 is incompatible with our automake requirement.

        * m4/macro.c (expand_argument): Fix missing initialization.
        * m4/m4private.h (struct m4_symbol_value): Store entire
        m4_builtin, not just the func.
        (m4_get_symbol_value_func): Update.
        (m4_get_symbol_value_builtin, m4_set_symbol_value_builtin): New
        fast accessors.
        * m4/m4module.h (m4_get_symbol_value_builtin)
        (m4_get_symbol_builtin): New prototypes.
        (m4_set_symbol_value_func): Delete, replace with...
        (m4_set_symbol_value_builtin): New function.
        (m4_builtin_find_by_name): Change signature.
        * m4/symtab.c (m4_symbol_value_print): Simplify.
        (m4_get_symbol_value_func): Update.
        (m4_get_symbol_value_builtin): New function.
        (m4_set_symbol_value_func): Delete, replace with...
        (m4_set_symbol_value_builtin): New function.
        (dump_symbol_CB) [DEBUG_SYM]: Simplify.
        * m4/builtin.c (m4_builtin_find_by_name): Change signature.
        * m4/input.c (struct m4_input_block): Remove unused trace member.
        (m4_push_builtin, builtin_print, init_builtin_token): Update
        callers.
        * m4/module.c (install_builtin_table): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * modules/gnu.c (builtin): Make it possible to retrieve a builtin
        token, even after the builtin has been undefined.
        * doc/m4.texinfo (Builtin): Document new capability.
        * NEWS: Likewise.

        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        tempname'.
        * modules/m4.c (m4_make_temp): Use it.
        * tests/builtins.at (mkstemp, mkdtemp): Update message wording.

2006-10-27  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am (dist_pkgdata_DATA): Distribute recently-added
        files.

2006-10-26  Eric Blake  <ebb9@byu.net>

        Silence -O2 -Wall -Wwrite-strings warnings.
        * m4/m4private.h (m4_symbol_value): Const-ify text.
        * m4/m4module.h (m4_get_symbol_value_text)
        (m4_get_symbol_value_placeholder, m4_set_symbol_value_text)
        (m4_set_symbol_value_placeholder): Likewise.
        * m4/macro.c (expand_token, expand_argument, expand_macro): Fix
        fallout.
        * m4/symtab.c (m4_symbol_value_delete, m4_symbol_value_copy)
        (m4_get_symbol_value_text, m4_get_symbol_value_placeholder)
        (m4_set_symbol_value_text, m4_set_symbol_value_placeholder):
        Likewise.
        * modules/format.c (format): Likewise.
        * src/main.c (main): Likewise.
        * src/freeze.c (produce_symbol_dump, dump_symbol_CB): Likewise.
        * modules/shadow.c (shadow, test): Likewise.
        * m4/output.c (m4_make_diversion): Don't hold on to empty
        diversions.
        (m4_output_init, make_room_for, m4_undivert_all): Don't type-pun.
        (m4_freeze_diversions): Likewise.  Don't use uninitialized
        variable.

        Convert diversions to list instead of sparse array, part 2.
        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        avltree-list'.
        * m4/output.c (m4_diversion): Add next pointer and divnum members.
        (diversion_table): Convert to a list instead of a sparse array.
        (free_list): Maintain free list of reclaimed diversions.
        (equal_diversion_CB, cmp_diversion_CB): New functions.
        (m4_output_init): Set up list.
        (m4_output_exit): Tear down list.
        (make_room_for, m4_undivert_all, m4_freeze_diversions): Change
        list iteration.
        (m4_make_diversion): Change creation of new diversions.
        (m4_insert_diversion_helper): New function, to avoid list
        searches.
        * tests/builtins.at (divert): The test now passes.
        * NEWS: Document this improvement.

        Convert diversions to list instead of sparse array, part 1.
        * m4/m4module.h (m4_shipout_text, m4_shipout_string): Use size_t
        for length.
        * m4/output.c (diversion, total_buffer_size, output_unused):
        Track size in size_t.  All users changed.
        (struct diversion): Reduce size now, to compensate for part 2.
        (m4_make_diversion, make_room_for): Avoid malloc overflow.
        (m4_output_exit): Fix typo in assert.
        (m4_output_init, make_room_for, m4_make_diversion)
        (m4_insert_diversion, m4_freeze_diversions): Adjust users of
        struct m4_diversion to disambiguate the new union.
        * tests/builtins.at (divert): Detect this failure.

2006-10-25  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_push_builtin): Add parameter.
        * modules/m4.c (defn): Update caller.
        * m4/input.c (file_read_init, string_read_init): No longer
        needed.
        (input_funcs): Change signature of read_func, all callers
        updated.
        (composite_peek, composite_read, composite_unget),
        (composite_print, composite_funcs): New input type.  Not yet
        fully utilized, but one step closer to fixing defn.
        (m4_input_block): Make every input block track current file and
        line.  Rename some members.  Remove unused out_line.  Add support
        for composite input block.
        (input_change): New flag.
        (file_peek, file_read, file_clean, file_unget, file_print):
        Update callers.
        (m4_push_file, m4_push_builtin, m4_push_string_init)
        (m4_push_string_finish, m4_push_wrapup, m4_pop_wrapup)
        (m4_skip_line, pop_input): Track input block changes.
        (m4_pop_wrapup): Avoid overflow.
        (init_builtin_token): Handle composite input.
        (next_char): Handle input block changes.
        * doc/m4.texinfo (Location): Remerge from branch.

        * src/m4.h (includes): Need <locale.h> after all; fixes
        regression from yesterday.

        * m4/system_.h (obstack_regrow): New macro.  Hopefully glibc will
        accept it someday.
        * m4/macro.c (expand_macro): Avoid referencing invalid memory.
        Handle nesting the argc obstack.
        (expand_token): Avoid unnecessary malloc.
        (collect_arguments): Copy name before invalidating it.
        (argc_stack, argv_stack): New variables.
        (m4_macro_expand_input): Initialize argc and argv stacks once per
        file, instead of once per macro.

2006-10-24  Eric Blake  <ebb9@byu.net>

        * src/m4.h (includes): Add gettext.h, for N_.  Assume setlocale.

2006-10-23  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Macro Arguments, Incompatibilities): Remerge
        from branch regarding stripped leading whitespace.

        * modules/m4.c (includes): Use safe headers even when configured
        with --enable-assert.
        (m4_builtin_table, m4_make_temp): Work around fact that mkstemp is
        #defined as mkstemp_safer.

2006-10-21  Eric Blake  <ebb9@byu.net>

        * modules/m4.c (m4_make_temp): Change signature.
        (maketemp, mkstemp): Update callers.
        * modules/m4.h (m4_make_temp_func): New export.
        * modules/gnu.c (mkdtemp): New macro.
        * doc/m4.texinfo (Operation modes): Document interaction with
        --safer.
        (Mkdtemp): New node.
        * tests/builtins.at (mkdtemp): New test.
        (mkstemp): Check for umask effect.
        * NEWS: Document new builtin.

        * tests/generate.awk (normalize): Update recognition of trailing
        spaces in tests.
        * doc/m4.texinfo: Minor formatting fixes from branch.
        (Foreach, Improved foreach): Merge from branch.
        * examples/foreach.m4: Merge from branch.
        * examples/foreachq.m4: New file from branch.
        * examples/foreach2.m4: Likewise.
        * examples/foreachq2.m4: Likewise.

        * doc/m4.texinfo (titlepage): Add myself as author.
        * src/main.c (AUTHORS): Likewise.

2006-10-19  Eric Blake  <ebb9@byu.net>

        * modules/m4.c (m4_make_temp, mkstemp): New functions.
        (maketemp): Add POSIX behavior and a warning.
        * tests/others.at (maketemp): Move this test...
        * tests/builtins.at (mkstemp): ...to here, and beef up.
        * tests/options.at (--safer): Update to new warning message.
        * doc/m4.texinfo (Mkstemp): Sync from branch.
        (Extensions): Update maketemp behavior.
        * NEWS: Document that maketemp now always warns.

        * tests/generate.awk: For ease of doc-writing, simplify selection
        of '-Ipath/to/examples' to '@comment examples'.
        * examples/forloop.m4: Simplify.
        * examples/forloop2.m4: New file.
        * examples/quote.m4: New file.
        * doc/m4.texinfo (Improved forloop): New node.
        (Manual): Clarify use of examples directory.
        (Shift, Forloop): Resync from branch.
        (Include, Location): Update to new usage of examples directory.

        * m4/system_.h (includes): Pick up <unistd.h> before checking for
        _POSIX_VERSION.
        (gettext_noop): Don't define here, let gettext.h do it instead.
        * po/POTFILES.in: Update entries to reflect gnulib imports.

2006-10-16  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Augment with 'gnulib-tool --import
        configmake'.
        * configure.ac (AM_INIT_AUTOMAKE): Bump requirement to 1.10a, for
        pkglibexecdir support.
        * Makefile.am (m4_libm4_la_SOURCES, m4/pathconf.h): No longer
        worry about pathconf.h, now that gnulib does it for us.
        (pkgmodincludedir): Simplify.
        (pkglibexecdir): Delete, now that automake does this.
        * m4/module.c (m4__module_init): Use PKGLIBEXECDIR.
        * src/main.c (usage): Likewise.
        * m4/symtab.c (m4_symbol_value_groks_macro): Fix typo.

        * doc/m4.texinfo: Port some changes from the branch.
        (Invoking m4): Promote to a chapter, instead of a section of
        Preliminaries.
        (Operation modes, Dynamic loading features, Preprocessor features)
        (Limits control Frozen state, Debugging options)
        (Command line files): Subdivide into new sections.
        (Cleardivert): Rename from cleardiv.

2006-10-14  Eric Blake  <ebb9@byu.net>

        * tests/others.at (stdin closed): Update to match previous patch.

        * m4/input.c (file_clean): Don't close stdin twice, POSIX says it
        is not portable.
        Reported by Ralf Wildenhues.

        * modules/m4.c (undivert): Merge from branch.
        * doc/m4.texinfo (Improved fatal_error): Fix typo.
        (Improved exch): New node, copied from branch.
        (Improved cleardivert): Update from branch.
        * THANKS: Update.

2006-10-13  Eric Blake  <ebb9@byu.net>

        * configure.ac (AC_CONFIG_HEADERS): Name the template config.hin,
        not config-h.in.
        * modules/gnu.c (builtin, indir): Transparently handle builtin
        tokens from defn.
        * doc/m4.texinfo (Indir, Builtin): Remerge from branch.
        * m4/input.c (m4_pop_wrapup): Display debug message when switching
        to wrapped text.
        (m4_input_init): No need to use empty file any more.
        (file_print): Display correct file name.
        * m4/utility.c (m4_error, m4_warn): Ensure we don't try to
        dereference a NULL file name.
        * m4/m4module.h (m4_pop_wrapup): New parameter.
        (m4_symbol_value_groks_macro, m4_symbol_groks_macro): New
        prototypes.
        * m4/m4private.h (m4_symbol_value_groks_macro): Faster version.
        * m4/symtab.c (m4_symbol_value_groks_macro): New method.
        * src/main.c (main): Adjust caller.
        * tests/options.at (--debugmode): Test more output from -dV.

2006-10-12  Eric Blake  <ebb9@byu.net>

        * m4/input.c (m4_print_token) [DEBUG_INPUT]: Modernize.

        * m4/m4private.h (m4__next_token_is_open): New prototype.
        * m4/m4module.h (m4_push_single): Delete; push_string is an
        adequate interface, and removing support for this simplifies the
        input engine.
        (m4_push_wrapup): New parameter.
        (m4_is_syntax): Delete; m4_has_syntax is sufficient.
        (M4_SYNTAX_LQUOTE, M4_SYNTAX_BCOMM, M4_SYNTAX_MASKS): Make
        start-quote and start-comment exclusive from other syntax
        categories.
        * m4/syntax.c: Likewise.
        * m4/input.c (input_funcs): Make polymorphic without requiring
        clients to know whether they are located at isp.  All users
        changed.
        (file_names): New variable.
        (m4_input_init): Initialize it.
        (m4_push_file): Use it.
        (m4_input_exit): Free it after use.
        (m4__next_token): Simplify slightly.
        (m4__peek_token): Rename and simplify...
        (m4__next_token_is_open): ... to this.  In particular, this
        allows us to avoid a double ungetc, which POSIX doesn't
        guarantee.
        (struct m4_input_block, m4_push_single, single_peek, single_read):
        Remove support for single characters, as the input engine now
        guarantees we don't need it.
        (file_unget, string_unget, m4_input_print, unget_input):
        Strengthen assertions.
        (file_init_funcs, file_read_init): New for file reading.
        (string_init_funcs, string_read_init): New for wrapped text.
        (m4_push_string_init, m4_push_string_finish, m4_push_wrapup):
        Support wrapped text with locations.
        (m4_skip_line): Support dnl across include file boundary.
        (peek_char): Don't pop input when peeking.
        (file_peek): Peek can be called at the end of the file.
        (string_read): Don't read beyond string bounds.
        * m4/macro.c (expand_token, collect_arguments): Update callers.
        (expand_macro): Report errors at location of open parenthesis.
        (expand_token, expand_argument, process_macro): Avoid negative
        array dereferences with m4_has_syntax.
        * m4/utility.c (skip_space): Likewise.
        * modules/m4.c (m4wrap): Update caller.
        * tests/builtins.at (__file__, __line__, dnl): New tests.
        * tests/options.at (--debugmode): Normalize the output.
        * doc/m4.texinfo (Macro Arguments, Dnl, History, Location):
        Remerge recent changes from branch.
        (Improved fatal_error): New node from branch.

2006-10-11  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage, long_options): Add --debugmode as an alias
        for --debug, to match macro name.
        * tests/options.at (--debugmode): Rename from --debug, and test
        for new alias.
        (--discard-comments): Augment test.
        * doc/m4.texinfo (Invoking m4, Debugmode): Document this.
        * NEWS: Likewise.

2006-10-10  Eric Blake  <ebb9@byu.net>

        Trace improvements: debugmode(c) was always printing the last two
        lines paired, combine them; and show non-text expansions.
        * m4/macro.c (trace_prepre): Update to show what the macro will
        expand to.
        (trace_pre): No need to special-case on debugmode(c).
        (trace_post): Likewise.  Also, show non-text expansions.
        (expand_macro): Update caller.  Collecting arguments can change
        debug mode, so cache values beforehand.
        (trace_format): Remove support for unused %l%S%r, and fix support
        for %z to match gcc's attribute((printf)).
        (trace_header): Update caller.
        * m4/input.c (struct m4_input_block): Rename from input_block.
        (struct input_funcs): Add print_func member.
        (file_print, builtin_unget, builtin_print, string_print)
        (m4_input_print): New functions.
        (m4_push_string_finish): Change return type.
        (m4_push_file): Fix missing use of close parameter.
        * m4/debug.c (m4_debug_decode): Don't clear pending traces.
        * m4/m4module.h (m4_input_print): New prototype.
        * tests/builtins.at (debug, esyscmd, multiquotes, syscmd): Update
        to match behavior change.
        * tests/options.at (--debug): Likewise.
        * tests/macros.at (Propagation of traceon)
        (Propagation of --trace): Likewise.
        * tests/others.at (stderr closed, stdout closed, stdin closed):
        Likewise.
        * doc/m4.texinfo (Forloop): Simplify.
        (Trace): Update to changed behavior.
        (Debugmode): Document this change.
        * src/main.c (usage): Likewise.
        * NEWS: Likewise.

2006-10-09  Eric Blake  <ebb9@byu.net>

        * m4/path.c (m4_include_env_init): Don't alter result of getenv.
        Reported by Ralf Wildenhues.

        * modules/gnu.c (gnu_buf): Rename from buf to silence -Wshadow.

2006-10-07  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_set_exit_failure): New prototype.
        * m4/utility.c (m4_set_exit_failure): New function.
        * modules/m4.c (m4exit): Use it to avoid yet another global
        variable export in libm4.

2006-10-06  Eric Blake  <ebb9@byu.net>

        * m4/output.c (cleanup_tmpfile): Exit nonzero on failure to clean
        up.
        * tests/others.at (stdout closed): Fix final check.

        Replace uses of tmpfile with clean-temp, since tmpfile is
        incompatible with closeout.
        * tests/builtins.at (esyscmd, syscmd): Don't use pipe; it loses
        exit status of m4.
        * tests/others.at (stderr closed): Likewise.
        * tests/testsuite.at (M4_ONE_MEG_DEFN): Actually hit one meg.
        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        clean-temp.
        * m4/output.c [!HAVE_TMPFILE]: Delete dead code.
        (m4_tmpfile, cleanup_tmpfile): New functions.
        (make_room_for, m4_insert_diversion): Use clean-temp module.
        * configure.ac (AC_CHECK_FUNCS_ONCE): No longer check for
        tmpfile.
        * doc/m4.texinfo (Diversions): Document new use of $TMPDIR.

        * m4/utility.c (m4_numeric_arg): Merge from branch.
        * modules/gnu.c (debuglen): New builtin.
        * src/main.c (usage, ARGLENGTH_OPTION, long_options, main):
        Rename --arglength to --debuglen.
        * tests/options.at (--arglength): Rename to --debuglen.
        (deprecated options): Augment test.
        * doc/m4.texinfo (Invoking m4): Document the name change.
        (Debugmode): Rename from Debug Levels.
        (Debugfile): Rename from Debug Output.
        (Debuglen): New node.
        * NEWS: Document these changes.

        * modules/m4.c (m4exit): Fix typo.  Ensure desired exit status in
        case closing a module exits.

        * modules/m4.c (m4exit): Merge from branch.
        * m4/m4.c (m4_delete): Avoid assertion triggered by last patch.

2006-10-05  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        closeout.
        * Makefile.am (m4_libm4_la_DEPENDENCIES): Add missing dependency.
        * src/main.c (main): Close stdout on exit.
        * m4/debug.c (set_debug_file): Check for write failure.
        * m4/m4.c (m4_delete): Don't mask write failure.
        * tests/testsuite.at (AT_CHECK_M4): Allow tracing by expanding
        macros before calling AT_CHECK.
        (M4_ONE_MEG_DEFN): New helper macro.
        * tests/others.at (stdout full): New test.
        (stderr closed, stdin closed, stdout closed): Augment.
        * tests/builtins.at (syscmd): New test.
        (esyscmd): Augment.

2006-10-04  Eric Blake  <ebb9@byu.net>

        * tests/builtins.at: Alphabetize tests.
        * tests/testsuite.at (AT_CHECK_M4): Allow choosing stdin.
        * tests/generate.awk (new_test): Fix underquoting.
        * tests/others.at (maketemp): Rename from misc.
        (stdin closed, stdout closed, stderr closed): New tests.

2006-10-03  Eric Blake  <ebb9@byu.net>

        Avoid all global variables in modules, so that --disable-static
        can work on cygwin.
        * examples/incl.m4: New file, from branch.
        * Makefile.am (dist_pkgdata_DATA): Distribute it.
        * doc/m4.texinfo (Location): Merge this section from branch.
        (Include): Update the test.
        * tests/generate.awk (new_test): Allow for VPATH build
        pre-processing of expected __program__ output.
        * m4/m4module.h (m4_current_diversion, m4_output_current_line):
        Avoid global variables.
        (m4_context_field_table): Add current_diversion, output_line.
        (m4_output_init, m4_make_diversion): Add parameter.
        (m4_get_program_name, m4_set_program_name): New accessors.
        * m4/m4private.h (m4_get_current_diversion),
        (m4_set_current_diversion, m4_get_output_line)
        (m4_set_output_line): New accessors.
        * m4/utility.c (m4_get_program_name, m4_set_program_name): New
        methods.
        * modules/m4.c (divnum, divert): Adjust callers.
        * modules/gnu.c (__program__): Likewise.
        * m4/output.c (m4_output_init, m4_make_diversion)
        (m4_freeze_diversions, m4_shipout_text, m4_make_diversion)
        (m4_insert_diversion): Likewise.
        * m4/input.c (file_clean, m4_push_file): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * src/main.c (main, usage): Likewise.

        Partially plug memory leak when unloading gnu module.
        * tests/modules.at (unload gnu module): New test.
        * modules/gnu.c (gnu_LTX_m4_finish_module): New function.
        (m4_regexp_compile): Move static storage to module visibility.
        * tests/options.at (--debug): Adjust to new output.

2006-09-29  Eric Blake  <ebb9@byu.net>

        Even when not the first option, --help can't have side effects.
        * tests/options.at (--debugfile): Detect bugs in this area.
        * tests/testsuite.at (AT_CHECK_M4): Avoid a process when ignoring
        stderr.
        * src/main.c (main): Fix it by deferring debugfile change.  Also,
        defer closing streams until after module tracing is done.
        * modules/gnu.c (debugfile): Make message consistent with command
        line.
        * doc/m4.texinfo (Invoking m4): Touch up the documentation.
        * NEWS: Document this fix.

        * modules/m4.c (dnl): Include macro name in warning message.
        * m4/input.c (m4_skip_line): Add parameter.
        * m4/m4module.h (m4_skip_line): Likewise.
        * src/main.c (usage): Update wording.
        * doc/m4.texinfo (Inhibiting Invocation): Add xfailed test until
        issue of blind macros vs. POSIX is resolved.
        (Dnl): Merge another node from branch.

        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        xstrtol.
        * m4/system_.h (N_): Define.
        * src/main.c (main): Validate numeric arguments.
        (size_opt): New function, idea borrowed from coreutils.
        * m4/macro.c (expand_macro): -L0 implies no limit.
        * doc/m4.texinfo (Invoking m4): Document this change.
        * NEWS: Likewise.
        * tests/options.at: (--arglength, --nesting-limit)
        (--regexp-syntax): New tests of argument validation.

2006-09-28  Eric Blake  <ebb9@byu.net>

        * tests/options.at: Alphabetize the tests.

2006-09-27  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_symbol_value_print, m4_symbol_print): Add
        another parameter to print module info.
        * m4/macro.c (trace_pre): Adjust caller.
        * modules/m4.c (M4BUILTIN_HANDLER): Likewise.
        * doc/m4.texinfo (Dumpdef, Debug Levels): Document this.
        * NEWS: Document this.

        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        strnlen.
        * m4/symtab.c (symbol_value_print): Rename to...
        (m4_symbol_value_print): ...this, and...
        (m4_symbol_print): Update to allow -L length truncation.  Now
        truncation also affects dumpdef output and builtin names.
        * m4/m4private.h (nesting_limit, max_debug_argument_length):
        Switch to size_t.
        * m4/m4module.h (m4_symbol_print): Add parameter.
        (m4_symbol_value_print): New function.
        * modules/m4.c (dumpdef): Allow length truncation.
        * m4/macro.c (trace_pre): Use m4_symbol_print, rather than
        repeating code.
        * doc/m4.texinfo (Invoking m4): Document -l better.
        (Dumpdef, Debug Levels): Document the effect of -l.
        * NEWS: Document this change.

        * modules/m4.c (m4_dump_symbols, errprint, m4wrap)
        (m4_expand_ranges): Ensure we aren't picking up partial object on
        obstack.
        * modules/stdlib.c (setenv): Allow extra arguments.
        * modules/time.c (ctime): Avoid side effect in call to
        obstack_grow.
        * modules/gnu.c (m4_regexp_substitute): Likewise.
        (renamesyms): Avoid extra obstack_init.
        * src/freeze.c (reload_frozen_state): Remove debug comment.
        (produce_frozen_state): Simplify fprintf to puts where possible.
        * modules/modtest.c (modtest_init, modtest_finish): Likewise.
        * modules/import.c (import, symbol_fail, modules_fail): Likewise.
        * m4/macro.c (trace_flush): Likewise.
        * m4/debug.c (m4_debug_message_prefix): Likewise.
        * m4/path.c (include_dump): Likewise.
        * m4/module.c (module_remove): Likewise.
        (install_builtin_table): Simplify malloc and string
        concatenation.

2006-09-26  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_symbol_print): New prototype.
        (M4_DEBUG_TRACE_STACK): New enumerator.
        (m4_is_debug_bit): Allow use without requiring m4private.h.
        * m4/symtab.c (symbol_value_print, m4_symbol_print): New
        functions.
        * modules/m4.c (dump_symbol_CB, m4_dump_symbols): Speed up
        callback.
        (dumpdef): Allow printing pushdef'd stacks.
        * m4/debug.c (m4_debug_decode): Add new 's' debug mode.
        * src/main.c (usage): Document it.
        * doc/m4.texinfo (Dumpdef, Debug Levels): Likewise.
        * NEWS: Likewise.

        * configure.ac (AC_CONFIG_HEADERS): Place <config.h> with other
        gnulib headers.
        * Makefile.am (AUTOMAKE_OPTIONS): Add nostdinc, to reduce length
        of lines during make.
        (AM_CPPFLAGS): Remove unneeded include path.
        (src_m4_CPPFLAGS): Remove redundant include path.
        * m4/system_.h Make preprocessor indentation consistent.
        (M4_DIRSEP_CHAR, M4_PATHSEP_CHAR, M4_GNUC_FORMAT): Remove unused
        macros.
        (UNIX, W32_NATIVE, OS2): Update platform recognition macros from
        branch.
        (M4_GNUC_PRINTF, M4_GNUC_SCANF, M4_GNUC_NORETURN)
        (M4_GNUC_CONST, M4_GNUC_UNUSED): Mangle names properly for header.
        (bool, true, false): Don't undefine here; stdbool takes care of
        that.
        * src/m4.h (includes): Assume config.h, and several standard
        headers.
        (__CYGWIN__, WIN32): Don't define here; let system.h do it.
        * m4/m4private.h: Assume config.h.
        * m4/output.c: Likewise.
        * m4/path.c: Likewise.
        * m4/resyntax.c: Likewise.
        * m4/utility.c: Likewise.
        * modules/gnu.c: Likewise.
        * modules/import.c: Likewise.
        * modules/load.c: Likewise.
        * modules/m4.c: Likewise.
        * modules/modtest.c: Likewise.
        * modules/mpeval.c: Likewise.
        * modules/perl.c: Likewise.
        * modules/shadow.c: Likewise.
        * modules/stdlib.c: Likewise.
        * modules/time.c: Likewise.
        * modules/traditional.c: Likewise.

2006-09-21  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Invoking m4): Add clarification on option
        processing behavior.
        * tests/options.at (option grouping): Test this.
        * THANKS: Update.
        Reported by Mikhail Teterin.

        * bootstrap: Add --force option, based on idea from coreutils.
        * README: Document that ./bootstrap and autoreconf are for
        developers, and not lightly done in tarballs.

2006-09-20  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage, OPTSTRING, main): Rename -e to -i.  Make
        warnings consistent.
        (long_options, HASHSIZE_OPTION): Warn on -H.
        * doc/m4.texinfo (Invoking m4): Document this.
        * tests/options.at (deprecated options): Update.

        Change the default of interactive sessions to match sh.
        * src/main.c (usage): Document this.
        (enum interactive_choice): New enum.
        (main): Use it to defer decision of interactive until after
        argument processing.
        * doc/m4.texinfo (Invoking m4): Document this.
        * NEWS: Likewise, plus add missing mention of -b.
        Reported by Stepan Kasal.

2006-09-19  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage, main, DEBUGFILE_OPTION): Deprecate -o as
        well as --error-output; the goal is to add -o/--output in some
        future version with semantics like gcc or autom4te.
        * doc/m4.texinfo (Invoking m4, Dumpdef, Debug Output, Errprint):
        (Extensions): Reflect this update.
        (Renamesyms): Add another test.
        (Defn): Xfail for now, so that `make check' is happy.
        * NEWS: Document this change.
        * tests/generate.awk: Mark dynamic loading tests as such.  Allow
        xfailing tests.
        * tests/macros.at (Renamesyms collisions): New test, exposing
        renamesyms' coredump.
        * tests/options.at (--debugfile, --safer): Update to match
        change.

        * m4/debug.c (set_debug_file): Fix regression in -o when stdout
        and stderr are same file, introduced 2003-07-23.
        * tests/options.at (--debugfile): New test, to catch the bug.
        (deprecated options): Test --error-output.
        * src/main.c (usage, main, long_options, ERROR_OUTPUT_OPTION):
        Deprecate --error-output, and replace it with --debugfile.
        * doc/m4.texinfo (Invoking m4, Debug Output, Dumpdef, Errprint):
        Document this change.
        * NEWS: Likewise.

2006-09-18  Eric Blake  <ebb9@byu.net>

        * modules/load.c (modules): Rename to...
        (m4modules): ...this, since it is an English word with 0
        arguments.
        * modules/gnu.c (symbols, m4symbols): Likewise.
        * doc/m4.texinfo (Listing Modules): Rename to...
        (M4modules): ...this.
        (Symbols): Rename to...
        (M4symbols): ...this.
        (Load, Foreach, Trace, Answers): Update to new spellings.
        * NEWS: Document this.

        * modules/m4.c (traceon, traceoff): Change to Solaris semantics,
        such that without arguments, the global trace flag is changed
        rather than walking the table of all currently-defined macros.
        (set_trace_CB): No longer needed.
        * m4/m4module.h (m4_set_symbol_name_traced): Add a parameter.
        (m4_set_symbol_traced): Delete.
        (m4_symtab_create): Nuke the nuke parameter.
        * m4/m4private.h (m4_get_symbol_value): Delete.
        * m4/symtab.c (m4_symbol_popdef): No more need for nuke_trace.
        (m4_set_symbol_name_traced): Free undefined entries that are no
        longer traced.
        (symbol_destroy_CB): Update caller.
        * m4/m4.c (m4_create): Update caller.
        * src/main.c (main): Likewise.
        (usage): Fix typo in last commit.
        * doc/m4.texinfo: Minor cleanups throughout.
        (Debugging, Dumpdef, Trace, Debug Levels, Debug Output): Merge
        more nodes from branch.
        (Trace): Document new semantics, and how to simulate the old.
        * tests/builtins.at (multiquotes): Adjust to new semantics.
        * NEWS: Update somewhat.

2006-09-14  Eric Blake  <ebb9@byu.net>

        Add --safer option, per debian bug 5898.
        * src/main.c (usage): Document new option.
        (SAFER_OPTION): New enumerator.
        (main): Set the option bit.
        * m4/m4module.h (m4_context_opt_bit_table): Declare new bit
        accessors.
        * m4/m4private.h (M4_OPT_SAFER_BIT): New macro.
        (m4_get_safer_opt): New accessor.
        * modules/gnu.c (esyscmd, debugfile): Disable when --safer.
        * modules/m4.c (syscmd, maketemp): Likewise.
        * doc/m4.texinfo (Invoking m4, Debug Output, Syscmd, Esyscmd)
        (Sysval, Maketemp): Add tests of this.
        * tests/options.at (--safer): Likewise.

2006-09-13  Eric Blake  <ebb9@byu.net>

        * tests/modules.at (AT_CHECK_M4_MODTEST): Use AT_CHECK_M4, for
        stderr filtering.
        Reported by Ralf Wildenhues.

        Fix installcheck.
        * Makefile.am (check_LTLIBRARIES): Build test libraries in the
        tests directory, so we can be sure an installed build is not
        picking up uninstalled non-test libraries.
        (check-local, installcheck-local): Depend on test libraries.
        * tests/modules.at (AT_CHECK_M4_MODTEST): Don't use options
        after file name.  Fix quoting.  Remove skipping the test, now
        that makefile guarantees test modules will exist.
        (Freezing modules, modules: shadow, modules: unload)
        (modules: trace): Always put test modules in module path.
        (modules: importing): Likewise, and rely on AT_CHECK_M4 for
        stderr munging.
        * src/main.c (usage): Document default module search path.
        (import_environment, frozen_file_to_read, frozen_file_to_write):
        Move...
        (main): ...here.
        * tests/testsuite.at (AT_CHECK_M4): Filter stderr here...
        * tests/m4.in: ...not here.
        Reported by Ralf Wildenhues.

2006-09-08  Eric Blake  <ebb9@byu.net>

        * bootstrap: Kill unrelated copy-n-paste code from argument
        parsing.  Let Makefile generate testsuite.
        * Makefile.am (EXTRA_DIST): Remove examples/WWW/man/Makefile.

2006-09-07  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_peek_input): No longer export.
        (m4_error_at_line, m4_warn_at_line): New prototypes.
        (m4_is_symbol_void): New macro.
        (m4_push_file): Update prototype.
        * m4/m4private.h (m4__peek_token): New prototype.
        (M4_TOKEN_OPEN, M4_TOKEN_COMMA, M4_TOKEN_CLOSE): New enumerators.
        * m4/utility.c (m4_error_at_line, m4_warn_at_line): New functions.
        * src/main.c (main): Allow reading from stdin twice.
        * modules/m4.c (include): Adjust to new prototype.
        * m4/input.c: General comment cleanup.
        (file_peek, file_read, file_unget, push_file): Set end flag on
        EOF, so that we don't call getc twice.
        (push_file, file_clean): Port fix from branch to avoid closing
        stdin prematurely.
        (pop_input): Port fix from branch to avoid reading free'd memory
        when input ends mid-string.
        (m4_pop_wrapup): Port fix from branch to allow multiple m4wraps.
        (string_peek, string_read): Always use unsigned char.
        (m4_skip_line): Warn when dnl cut short by EOF.
        (peek_input): Rename from m4_peek_input.
        (match_input): Update signature, to distinguish between `(' token
        and multi-char quote or comment beginning with `('.
        (m4_input_exit): Cleanup now done in m4_pop_wrapup.
        (m4__peek_token): New function, ported from branch.
        (m4__next_token): Update to new token types.
        * m4/macro.c (expand_token, expand_argument): Use peek_token.
        * doc/m4.texinfo (Pseudo Arguments, Defn, Answers): Fix typos.
        (Invoking m4): Remerge from branch.

        * Makefile.am ($(TESTSUITE)): Revert patch from 2006-09-05...
        (check-local): and put dependency here.
        Reported by Ralf Wildenhues.

2006-09-05  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (m4_debug_message): New prototype.
        (M4_DEBUG_TRACE_MODULE): New debug bit.
        * m4/m4private.h (M4_DEBUG_MESSAGE, M4_DEBUG_MESSAGE1)
        (M4_DEBUG_MESSAGE2): Delete these macros.
        * m4/debug.c (m4_debug_message): New method.
        (m4_debug_decode): Add module tracing as flag `m'.
        * m4/input.c (m4_push_file, file_clean): Use new method.
        * m4/path.c (m4_path_search): Likewise.
        * po/Makevars (XGETTEXT_OPTIONS): Likewise.
        * m4/module.c (install_builtin_table, install_macro_table)
        (m4__module_open, module_close, module_remove): Promote several
        module debug messages outside of DEBUG_MODULES.
        (m4__module_init, module_remove) [DEBUG_MODULES]: Don't mix
        DEBUG_MODULES with normal trace output.
        * src/main.c (usage): Document new flag.
        * doc/m4.texinfo (Debug Levels): Likewise.
        * Makefile.am ($(TESTSUITE)): Add missing dependency.
        * tests/m4.in: Neutralize platform-dependent module filenames.
        * tests/options.at (--debug): Update expected output.

2006-09-05  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * doc/m4.texinfo: Fix some typos.
        * tests/others.at: Likewise.

2006-09-05  Eric Blake  <ebb9@byu.net>

        * m4/input.c (lex_debug): Remove dead code that broke compilation
        with --enable-debug.
        * m4/module.c (install_builtin_table, install_macro_table)
        (m4__module_init, m4__module_open, module_close)
        (module_remove): Fix compilation when --enable-debug.
        * m4/output.c (m4_shipout_text): Likewise.
        * ltdl/m4/debug.m4 (M4_CHECK_DEBUGGING): Preload all static
        libraries when --enable-debug.
        * configure.ac (DYNAMIC_MODULES): New variable, to pass
        information to testsuite.
        (modules to preload): Determine modules after we know whether
        shared libraries are supported.
        * tests/atlocal.in (DYNAMIC_MODULES): Substitute this into
        testsuite.
        * tests/testsuite.at (AT_CHECK_DYNAMIC_MODULE): New macro.
        * tests/modules.at (Freezing modules, AT_CHECK_M4_MODTEST)
        (modules: shadow, modules: unload, modules: importing)
        (modules: trace): Use new macro.
        * tests/builtins.at (gmp): Likewise.

        * m4/macro.c (expansion_level, macro_call_id): Change to size_t.
        All users updated.
        (expand_token): Avoid assertion just added to docs.
        (expand_macro): Track pending expansions, for when a symbol's
        definition changes during argument collection.
        (m4_macro_call, process_macro): Operate on symbol value, not
        symbol, since symbol may have changed during argument collection.
        * m4/m4private.h (m4_symbol_value): Add pending_expansions member.
        (VALUE_PENDING, SYMBOL_PENDING, VALUE_DELETED_BIT): New defines.
        (m4_get_symbol_value): Add fast macro version.
        * m4/m4module.h (M4_BUILTIN_FLAGS_MASK): New enumerator.
        (m4_macro_call): Adjust prototype.
        * m4/module.c (install_builtin_table): Check that flags are valid
        when creating builtin.
        * m4/symtab.c (m4__symtab_remove_module_references): Use
        m4_symbol_value_delete, rather than inlining it.
        (m4_symbol_value_copy): Copy placeholder text.
        (symbol_popval): Use m4_symbol_value_delete.
        (m4_symbol_value_delete): Implementation was missing when NDEBUG.
        Handle pending expansions.
        * modules/gnu.c (indir): Update to new prototype.
        * doc/m4.texinfo: Fix menus to be consistent with section names.
        (Defn): Add test that macro tokens flatten to empty string;
        triggered an assert before this patch.
        (Ifelse): Merge another node.
        (Loops): Split into...
        (Forloop, Foreach): New nodes; work is still underway on them.
        (Answers): Add more info on foreach macro; work is still underway.
        (Indir): Add test that indir collects arguments before looking up
        macro.
        * TODO: Update based on this patch.

2006-09-01  Eric Blake  <ebb9@byu.net>

        * m4/m4.c (m4_create): Fix latent bug since 2003-10-08.
        * m4/hash.h (m4_free_hash_iterator): New prototype.
        * m4/hash.c (struct m4_hash) [!NDEBUG]: Add iter member, to
        ensure we don't do unsafe things while iterating.
        (HASH_ITER, ITER_CHAIN): New accessor macros.
        (m4_hash_new, m4_hash_resize, maybe_grow): Fix malloc typing bug.
        (m4_hash_delete, m4_hash_insert): Unsafe while iterating.
        (m4_hash_remove) [!NDEBUG]: Enforce safety while iterating.
        (m4_get_hash_iterator_next) [!NDEBUG]: Track current iterators,
        to catch unsafe actions.
        (m4_free_hash_iterator): New function, to avoid memory leaks, and
        when debugging, to track safe actions.
        (m4_hash_apply): Avoid memory leak.
        * m4/symtab.c (m4_symtab_apply): Likewise.
        * ltdl/m4/gnulib-cache.m4: Remove getopt from here; it is pulled
        in manually to src/ for now.
        * tests/builtins.at (gmp): Add keyword module.
        * tests/modules.at (Freezing modules, modules: shadow)
        (modules: unload, modules: importing, modules: trace): Likewise.

2006-08-30  Eric Blake  <ebb9@byu.net>

        * m4/utility.c (m4_warn): Factor "Warning" out of messages into
        here.
        (m4_bad_argc, m4_numeric_arg): Update all callers.
        * m4/macro.c (m4_macro_call): Likewise.
        * doc/m4.texinfo (Defn, Pushdef): Fix typos in last commit.
        (Indir, Builtin, Ifdef): More doc merges.
        (Loops): Mention that documenting foreach would be nice.
        (Macro Arguments, Defn, Builtin, Ifdef, Ifelse, Changesyntax)
        (Include, Eval, Location, M4exit): s/input.m4/stdin/.
        * modules/gnu.c (indir, builtin): Warn, not error, on undefined.
        (substitute, syncoutput): Update all m4_warn callers.
        * modules/m4.c (undefine, popdef, m4_dump_symbols, defn)
        (traceon, traceoff): Make warning message consistent.
        (define, pushdef): Update all m4_warn callers.
        * tests/generate.awk: Choose file name so that documentation can
        show command-line behavior.
        * tests/builtins.at (define): Update to new wording.
        * tests/macros.at (pushdef/popdef): Likewise.
        * tests/freeze.at (loading format 1): Likewise.
        * tests/modules.at (AT_CHECK_M4_MODTEST): Likewise.

        * doc/m4.texinfo (Undefine, Defn, Pushdef): More doc merges from
        the branch.
        (Defn): Add failing test case for mixing text and builtin.
        (Renamesyms): Improve wording, and identify core dump that needs
        fixing.

2006-08-29  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Quoting Arguments, Definitions, Define)
        (Arguments, Pseudo Arguments): More doc merges from the branch.
        (Macro expansion): Turn example into test.
        (Pseudo Arguments): Add example of avoiding argument.
        * modules/m4.c (undefine, popdef): Accept multiple arguments.
        (define, pushdef): Warn on non-text macro name.
        (ifelse, m4_dump_symbols, defn, traceon, traceoff): Tweak
        warning/error messages.
        (ifdef): Ignore extra arguments.
        * m4/symtab.c (m4_symbol_value_copy): Avoid memory leak.
        (m4__symtab_remove_module_references): Check that there is no leak.
        * tests/macros.at (pushdef/popdef): Update to new message.
        * tests/builtins.at (define): Likewise.
        * tests/freeze.at (loading format 1): Likewise.
        * tests/modules.at (AT_CHECK_M4_MODTEST): Likewise.

        * m4/m4private.h (m4_get_syntax_lquote, m4_get_syntax_rquote)
        (m4_get_syntax_bcomm, m4_get_syntax_ecomm) [NDEBUG]: Use same type
        as accessor function, to avoid compiler warning.
        * m4/module.c (m4__module_open): Move declaration of variable to
        avoid compiler warning.
        * src/main.c (main): Avoid shadowing a global variable.
        * src/freeze.c (produce_symbol_dump): Avoid unused variable
        warning when NDEBUG.
        * tests/options.at (--discard-comments, --import-environment)
        (--debug, --prepend-include, --help and --version): Rename tests
        to name option tested.

2006-08-28  Eric Blake  <ebb9@byu.net>

        * m4/utility.c (m4_bad_argc): Move assertion out of hot path...
        * m4/module.c (install_builtin_table): ...to here, and add
        assertion that blind macros require arguments.
        * m4/m4module.h (struct m4_builtin): Document restrictions that
        must be met during module loading.
        * modules/gnu.c (changeresyntax, changesyntax): These are blind,
        so require an argument to avoid triggering assertion.
        (debugfile): Tweak error message.

2006-08-25  Eric Blake  <ebb9@byu.net>

        * m4/m4module.h (M4_BUILTIN_GROKS_MACRO, M4_BUILTIN_BLIND)
        (M4_BUILTIN_SIDE_EFFECT): New enumerators.
        (struct m4_builtin): New member flags replaces groks_macro_args,
        blind_if_no_args.  min_args and max_args are now 0-based.
        Rearrange members to reduce size on platforms where function
        pointers are 64 bits but regular pointers are 32.
        (m4_bad_argc): Add argument.
        * m4/m4private.h (VALUE_SIDE_EFFECT_ARGS_BIT): New define.
        * m4/utility.c (m4_bad_argc): Simplify calculation, and take side
        effect into account.
        * m4/module.c (install_builtin_table): Adjust all users affected
        by this API change.
        * m4/macro.c (m4_macro_call): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * modules/m4.c (builtin_functions, ifelse, syscmd): Likewise.
        * modules/gnu.c (builtin_functions, builtin, esyscmd): Likewise.
        * modules/import.c (builtin_functions): Likewise.
        * modules/load.c (builtin_functions): Likewise.
        * modules/modtest.c (builtin_functions): Likewise.
        * modules/mpeval.c (builtin_functions): Likewise.
        * modules/perl.c (builtin_functions): Likewise.
        * modules/shadow.c (builtin_functions): Likewise.
        * modules/stdlib.c (builtin_functions): Likewise.
        * modules/time.c (builtin_functions, mktime_functions)
        (strftime_functions): Likewise.
        * doc/m4.texinfo (Loops): Update test now that shift is blind.
        (Macro Arguments): Fix typo in test.
        (Patsubst): Fix typo in test.
        * modules/gnu.c (m4_regexp_substitute): Don't skip empty match at
        end of string.  Fix return value when ignore_duplicates.
        * tests/builtins.at (patsubst): Fix typo in test.

        * tests/options.at (debug-flags): Update to reflect new message.
        (deprecated options, prepend-include, help and version): New
        tests.
        * tests/testsuite.at (AT_CHECK_M4): Avoid hanging testsuite if
        test omits an input file name.
        * src/main.c (long_options, main): Add -B/--prepend-include.
        (usage): Document it.
        (main): `m4 --help --version' now displays help, not version.
        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        dirname filenamecat.
        * m4/m4module.h (m4_add_include_directory): Add parameter.
        * m4/m4private.h (m4__include_init): New prototype.
        * m4/m4.c (m4_create): Put `.' on path before options are
        collected.
        * m4/path.c (includes): Assume C89.  Use gnulib for file name
        management.
        (m4__include_init): New function.
        (search_path_add): Allow prepending.
        (m4_add_include_directory, search_path_env_init): Adjust callers.
        (m4_path_search): Relative names now invoke path search, since
        `.' might not be first.
        * doc/m4.texinfo (Invoking m4, Search Path): Document new option.

2006-08-25  Bruno Haible  <bruno@clisp.org>  (tiny change)
        and Eric Blake  <ebb9@byu.net>

        * bootstrap: Run autopoint before gnulib-tool, since autopoint
        0.15 installs macros obsoleted by current gnulib.

2006-08-25  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Macro Arguments): Another section merged;
        testsuite failures now exposed.

2006-08-23  Eric Blake  <ebb9@byu.net>

        * doc/m4.texinfo (Quoted strings, Other tokens, Comments)
        (Input processing): More doc merges from the branch.
        (Regular expression syntax): Add introductory text.
        (Inhibiting Invocation): More doc merges from the branch.
        (Other tokens): Reorder after comments.
        * tests/generate.awk: Allow passing options to doc examples.

2006-08-22  Eric Blake  <ebb9@byu.net>

        * tests/options.at (debug-flags): New test.
        * m4/m4module.h (M4_DEBUG_TRACE_VERBOSE): Make sure this value is
        not negative, to distinguish failure in m4_debug_decode.
        (m4_debug_decode): Add new parameter.
        * modules/gnu.c (regexp): Slight cleanup.
        (renamesyms): Ignore excess arguments.
        (syncoutput): Make case-insensitive, warn on bad argument.
        (debugmode): Factor -+ handling out to...
        * m4/debug.c (m4_debug_decode): ...here.
        (m4_debug_message_prefix): Fix spacing.
        * src/main.c (main): Let -d option adjust flags.
        * m4/input.c (file_clean): Avoid printing empty file name.
        * doc/m4.texinfo (Syncoutput): Document new range of input.
        (Invoking m4): Document use of multiple -d flags.

        Start porting various fixes from the branch that use gnulib.
        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        binary-io cloexec close-stream fopen-safer getopt gnupload mkstemp
        regexprops-generic stdlib-safer unlocked-io.
        * m4/debug.c (m4_debug_set_output): Close debug file on exec.
        * m4/path.c (m4_path_search): Close input file on exec, reject
        empty file name, fix parameter naming.
        * m4/output.c (make_room_for): Close diversion file on exec.
        (includes): Assume C89 headers.
        (tmpfile): For now, we don't want tmpfile-safer, because we want
        clean-temp later.
        * m4/m4private.h (includes): Use various gnulib headers.
        * doc/regexprops-generic.texi: Use gnulib's copy.

        * configure.ac (AM_INIT_AUTOMAKE): Bump automake requirement.
        * AUTHORS: Add copyright.
        * ChangeLog: Likewise.
        * README: Likewise.  Require automake 1.9b or later.
        * HACKING: New file.
        * README-alpha: Add copyright.
        * THANKS: Likewise.  Update.
        * doc/STYLE: Add copyright, and tweak for changed directories.
        * modules/README: Add copyright, and tweak for libtool version.
        * examples/COPYING: New file.
        * examples/WWW/COPYING: Likewise.
        * examples/WWW/m4lib/COPYING: Likewise.
        * modules/shadow.m4: Add copyright.
        * modules/perl.m4: Likewise.
        * modules/modtest.m4: Likewise.
        * modules/stdlib.m4: Likewise.
        * modules/time.m4: Likewise.
        * modules/time2.m4: Likewise.
        * po/Makevars: Likewise.
        * tests/iso8859.m4: Likewise.
        * tests/m4.in: Likewise.
        * NEWS: Add (C) to copyright.
        * TODO: Likewise.
        * m4/system_.h: Likewise.
        * tests/atlocal.in: Likewise.
        * tests/builtins.at: Likewise.
        * tests/freeze.at: Likewise.
        * tests/generate.awk: Likewise.
        * tests/macros.at: Likewise.
        * tests/modules.at: Likewise.
        * tests/options.at: Likewise.
        * tests/others.at: Likewise.
        * tests/testsuite.at: Likewise.
        * m4/utility.c: Spell out copyright years.
        * src/main.c: Likewise.

        * doc/m4.texinfo (Bugs, Manual, Syntax): Sync from branch.

2006-08-21  Eric Blake  <ebb9@byu.net>

        * configure.ac (AC_CHECK_HEADERS_ONCE): Check for <sys/wait.h>.
        * modules/gnu.c (esyscmd): Use -1 for failure.  Set sysval to 0
        when no arguments are given, but without losing warning about 0
        arguments.
        * modules/m4.c (syscmd): Likewise.
        (includes): Assume C89.
        (m4_sysval): Make static.
        (M4_SYSVAL_EXITBITS, M4_SYSVAL_TERMSIGBITS): New macros.
        (sysval): Port calculation from branch.

2006-08-20  Eric Blake  <ebb9@byu.net>

        * m4/macro.c (expand_macro): Move argument check...
        (m4_macro_call): ...to here, so indir will warn.
        * modules/gnu.c (__program__): New macro, ported from branch.
        (builtin): Perform argument check.
        (changesyntax): Avoid out-of-bounds read.

        * modules/gnu.c (includes): Assume stdlib.h, errno.
        (m4_regexp_compile): Add no_sub parameter, avoid memory leaks.
        (substitute): Add caller parameter, avoid out-of-bounds memory
        references.
        (m4_regexp_substitute, patsubst, regexp, renamesyms): Adjust
        callers.

2006-08-16  Eric Blake  <ebb9@byu.net>

        * po/POTFILES.in: Add more files that contain translatable
        strings.
        * po/Makevars (XGETTEXT_OPTIONS): Add options to pass more
        information to translators.
        (USE_MSGCTXT): New var for gettext 0.15.
        * m4/input.c (file_clean, m4_push_file, m4__next_token): Start
        debug/trace messages in lower case.
        * m4/macro.c (expand_argument): Likewise.
        * m4/path.c (m4_path_search): Likewise.
        * src/main.c (main): Likewise.

2006-08-14  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage): Document --import-environment.
        * doc/m4.texinfo (History, Invoking m4): Synchronize from branch.

2006-08-11  Eric Blake  <ebb9@byu.net>

        * bootstrap (func_get_translations): Only remove files when doing
        full update.
        (func_update_po): Avoid CDPATH problems.

2006-08-10  Eric Blake  <ebb9@byu.net>

        * bootstrap (func_get_translations): New function.
        (func_update_po): Borrow ideas from tar to correctly pull in
        translations from newer location.

2006-08-09  Eric Blake  <ebb9@byu.net>

        * bootstrap: Recent gnulib no longer has jm_* macros to worry
        about.
        * ltdl/m4/gnulib-cache.m4: Augment with gnulib-tool --import
        verror.
        * m4/m4module.h (M4ERROR, M4WARN): Delete, replaced by...
        (m4_error, m4_warn): ... these new prototypes.
        (m4_current_file, m4_current_line): Move into context, rather
        than leaving as globals.
        (m4_insert_file, m4_insert_diversion, m4_freeze_diversions)
        (m4_undivert_all, m4_input_init): Now takes context.
        * m4/utility.c (m4_error, m4_warn): New functions.
        * m4/m4private.h: Assume errno exists.
        (struct m4): Move warning_status to a bit flag,
        and add exit_status.  Adjust accessors accordingly.
        * src/main.c (print_program_name_CB): No longer needed.
        (main): Use new m4_get_fatal_warnings_opt.
        * m4/debug.c: Adjust all callers of M4WARN and M4ERROR, and abort
        instead of issuing "INTERNAL ERROR".  Pass context when needed,
        and use new accessors.
        * m4/input.c: Likewise.
        * m4/macro.c: Likewise.
        * m4/output.c: Likewise.
        * m4/utility.c: Likewise.
        * modules/evalparse.c: Likewise.
        * modules/gnu.c: Likewise.
        * modules/load.c: Likewise.
        * modules/m4.c: Likewise.
        * modules/mpeval.c: Likewise.
        * src/freeze.c: Likewise.
        * src/main.c: Likewise.
        * tests/macros.at: Adjust to new message format.
        * tests/builtins.at: Likewise.
        * tests/freeze.at: Likewise.
        * tests/modules.at: Likewise.
        * doc/m4.texinfo: Likewise.

        * configure.ac (AM_GNU_GETTEXT, AM_GNU_GETTEXT_VERSION): Require
        newer gettext 0.15.

2006-08-03  Eric Blake  <ebb9@byu.net>

        * src/stackovf.c (setup_stackovf_trap): Port patch from branch to
        gracefully handle ENOSYS.
        * TODO: Update.
        * THANKS: Update.

2006-07-28  Eric Blake  <ebb9@byu.net>

        * src/freeze.c (reload_frozen_state): Copy string when creating
        placeholder, to avoid memory corruption.
        * m4/symtab.c (symbol_popval): Avoid memory leak.
        (m4_symbol_rename): Avoid shadowing rename function.
        (dump_symbol_CB, symtab_dump) [DEBUG_SYM]: Fix compilation.
        * tests/freeze.at (reloading unknown builtin): Add test.
        * tests/generate.awk: Capture m4.texinfo line number in
        testsuite.log, not just generated.at.

        Port idea from branch that a frozen file can request an unknown
        builtin without producing a warning unless the builtin is
        actually used.
        * m4/m4private.h (m4__symbol_type): Add M4_SYMBOL_PLACEHOLDER.
        (m4_is_symbol_value_placeholder, m4_get_symbol_value_placeholder)
        (m4_set_symbol_value_placeholder): New accessors.
        * m4/m4module.h (m4_is_symbol_placeholder),
        (m4_get_symbol_value_placeholder),
        (m4_set_symbol_value_placeholder),
        (m4_get_symbol_placeholder): Likewise.
        * m4/symtab.c (m4_is_symbol_value_placeholder),
        (m4_get_symbol_value_placeholder),
        (m4_set_symbol_value_placeholder): Likewise.
        (dump_symbol_CB): Handle new symbol type.
        * m4/macro.c (trace_pre): Likewise.
        (m4_macro_call): Warn when invoking a placeholder.
        * modules/m4.c (dumpdef): Handle dumping a placeholder.
        (defn): Warn when referencing a placeholder.
        * src/freeze.c (dump_symbol_CB): Ignore placeholder when
        freezing.
        (reload_frozen_state): When reloading unknown builtin, install a
        placeholder instead of warning.
        * tests/freeze.at (loading format 1): Allow warning when
        popdef'ing undefined function.

2006-07-27  Paul Eggert  <eggert@cs.ucla.edu>  (tiny change)

        * m4/hash.c (m4_hash_string_hash): Don't case-fold in the hash
        function. Shift by 7, not 3, for consistency with
        gnulib/lib/hash.c. Don't assume hash word is 32 bits.

2006-07-27  Eric Blake  <ebb9@byu.net>

        * src/main.c (usage): Update to match branch.
        (main): Update --version info to distinguish between program name
        `m4' and package name `GNU M4'.
        (AUTHORS): Translate René Seindal's name.
        * configure.ac (TIMESTAMP): Remove now-redundant parentheses.
        * Makefile.am (doc/m4.1): Update to match branch.
        * m4/m4.c (DEFAULT_NESTING_LIMIT): Raise to 1024, to match
        branch.

        * m4/system_.h (EXIT_MISMATCH): Define.
        * src/main.c (main): Don't clear syntax table for version 1.
        (usage): Document exit status.
        * src/freeze.c (reload_frozen_state): Port GET_DIRECTIVE from the
        branch, and require V directive to appear first in file.  Fix
        broken logic for detecting F and T in version 1 files.

2006-07-22  Eric Blake  <ebb9@byu.net>

        * src/main.c (stackovf_handler): Document the problems in our
        overflow handler.
        * src/stackovf.c: Forward port changes in branch to use POSIX
        sa_sigaction when available.
        (process_sigsegv): Avoid buffer overrun when error string is
        translated, although the fact that we translate in a signal
        handler is still a bug.
        * ltdl/m4/stackovf.m4 (M4_SYS_STACKOVF): Forward port changes
        from branch to modernize checks.

        * modules/format.c (format): Avoid compiler warning that str may
        be used uninitialized.

        * m4/m4private.h (DEBUG_MODULES, DEBUG_STKOVF) [DEBUG]: Fix
        spelling.
        (DEBUG_SYNTAX) [DEBUG]: Turn on more debug.
        (DEBUG_MACRO): Remove unused macro.
        * src/stackovf.c: Avoid compiler warnings.
        * m4/input.c: Likewise.
        * m4/module.c: Likewise.
        * m4/output.c: Likewise.
        * m4/path.c: Likewise.
        * m4/symtab.c: Likewise.
        * m4/syntax.c: Likewise.

2006-07-20  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: gnulib-tool has changed again.
        Regenerate to explicitly ask for --assume-autoconf=2.60.

2006-07-19  Eric Blake  <ebb9@byu.net>

        * po/ChangeLog: Merge into main ChangeLog, then delete file.
        * THANKS: Update.

        * doc/m4.texinfo (copying): Relax restriction on front-cover and
        back-cover texts.

2006-07-17  Eric Blake  <ebb9@byu.net>

        * configure.ac (AM_GNU_GETTEXT_VERSION): Bump requirement to
        0.14.5.

        * ltdl/m4/gnulib-cache.m4: Augment with `gnulib-tool --import
        xvasprintf'.
        * modules/format.c (includes): Use xvasprintf.h.
        (format): Make static.  Avoid buffer overflow, that can lead to
        arbitrary code execution exploit.  Only pass unsigned char to
        is*().  Support F, g, and G specifiers.
        * doc/m4.texinfo (Format): Expose buffer overrun bug.  Document
        new specifiers.

2006-07-17  Gary V. Vaughan  <gary@gnu.org>

        Ensure M4 compiles correctly with -DDEBUG, and use a single
        consistent definition of various /DEBUG_[A-Z]+/ symbols:

        * m4/input.c: Have commented out out DEBUG_INPUT only by default.
        (m4_print_token): Use m4_get_symbol_value_text and
        m4_get_symbol_value_func calls instead of obsolescent VALUE_TEXT
        and VALUE_FUNC respectively.
        (m4__next_token): Use m4_print_token call instead of obsolescent
        print_token symbol.
        * m4/module.c: Have commented out out DEBUG_MODULE only by default.
        * m4/output.c: Similarly for DEBUG_OUTPUT.
        * m4/path.c: Similarly for DEBUG_INCL.
        * m4/symtax.c: Similarly for DEBUG_SYM.
        * m4/syntax.c: Similarly for DEBUG_SYNTAX.
        * src/stackovf.c: Similarly for DEBUG_STACKOVF.
        * m4/m4private.h (DEBUG): Add DEBUG_OUTPUT and DEBUG_STACKOVF to
        preprocessor macros defined with -DDEBUG compiles.

2006-07-17  Gary V. Vaughan  <gary@gnu.org>  (tiny change)

        * bootstrap: Correct typo in --download-po argument parsing.

2006-07-15  Eric Blake  <ebb9@byu.net>

        * ltdl/m4/gnulib-cache.m4: Augment with `gnulib-tool --import
        gendocs fdl'.
        * tests/generate.awk (normalize): Recognize @tabchar.
        * doc/m4.texinfo (Top): Start merging from branch.  Remove tabs.
        Fix menus.  Upgrade FDL license from 1.1 to 1.2.  Fix overfull
        hboxes.
        (Index macro, Shell commands, Incompatiblities): Rename nodes
        from Index, UNIX commands, Other incompat.
        (Platform macros, Using frozen files, Frozen file format 1)
        (Frozen file format 2, Copying This Manual, Indices): New nodes.
        * Makefile.am (EXTRA_DIST): Distribute gendocs.
        (MAINTAINERCLEANFILES): Clean up files from gnulib.
        (doc_m4_TEXINFOS): Depend on fdl.texi.
        (web-manual): New maintainer target.

2006-07-14  Gary V. Vaughan  <gary@gnu.org>

        * doc/m4.texinfo (Modules):  RMS asked me for an explanation of
        the modular architecture of M4.  The result is paraphrased here
        for the benefit of future readers of the manual.

2006-07-14  Gary V. Vaughan  <gary@gnu.org>  (tiny change)

        * Makefile.am (TESTSUITE_AT): Add missing tests/freeze.at.

2006-07-14  Eric Blake  <ebb9@byu.net>

        * src/main.c (main): Avoid compiler warning.
        * modules/gnu.c (renamesyms): Remove unused variable.

2006-07-14  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4module.h (m4_regexp_syntax_decode, m4_regexp_syntax_encode)
        (m4_get_regexp_syntax_opt, m4_set_regexp_syntax_opt): Declare
        new functions for managing regexp syntax options.
        * m4/m4private.h (m4): Add regexp_syntax field.
        * m4/resyntax.c: New file implements the above.
        * Makefile.am (m4_libm4_la_SOURCES): Add m4/resyntax.c.
        * modules/gnu.c (RE_SYNTAX_BRE, RE_SYNTAX_ERE, builtin_eregexp)
        (builtin_epatsubst, builtin_erenamsyms, m4_regexp_do)
        (m4_patsubst_do, m4_renamesyms_do): Removed.
        (builtin_changeresyntax): New builtin to change regular expression
        syntax.
        (m4_resyntax_encode_safe): Factor out diagnostics code.
        * src/freeze.c (produce_resyntax_dump): New function to dump
        default regexp syntax specifier to frozen file.
        (reload_frozen_state): Updated to action 'R' directive.
        * src/main.c (usage): Describe new -r option.
        (long_options, OPTSTRING): Declare it.
        (main): Encode and store cli regexp syntax option argument.
        * tests/freeze.at (regexp syntax): New test that regexp syntax
        survives freezing.
        * tests/generate.awk (m4_pattern_allow): Updated for renamesyms.
        * doc/m4.texinfo (Erenamesyms and Renamesyms, Eregexp and Regexp)
        (Epatsubst and Patsubst): Renamed to...
        (Renamesyms, Regexp, Patsubst): ...these respectively. Updated
        documentation and added new examples.
        (Changeresyntax): New section describing changeresyntax builtin,
        and regexp syntax names.
        (Regular expression syntax): New section describing differences
        between various regular expression syntaxes.
        (Frozen files): Document 'R' directive.
        * NEWS: Updated.

2006-07-13  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap: Enhanced to work more like our other scripts:
        Add a copyright statement; support --version and --help; accept a
        --download-po option with argument as a substitute for DOWNLOAD_PO
        in the environment.

2006-07-11  Eric Blake  <ebb9@byu.net>

        * Makefile.am (doc/m4.1): Port patch from branch that avoids
        intermediate file.
        * ltdl/m4/gnulib-cache.m4: Regenerate since upstream gnulib-tool
        changed.

2006-07-10  Gary V. Vaughan  <gary@gnu.org>  (tiny change)

        * tests/builtin.at (patsubst, regexp):  Adjust these tests, now
        that `\0' is no longer accepted.

        * src/main.c (usage): Alphabetize options within their sections.

        * modules/gnu.c (m4_regexp_search, regsub, substitute)
        (esyscmd):  Improve comments.

        * modules/gnu.c (substitute): Remove old warning for \0.
        (substitute_warned): No longer required.  Removed.

        * modules/gnu.c: Put macro definitions into alphabetical order.

2006-07-07  Eric Blake  <ebb9@byu.net>

        * tests/freeze.at (loading format 1): New file, with new test.
        * tests/testsuite.at: Include it.
        * tests/macros.at (Arity, defn, and freeze): Add frozen keyword.
        * tests/modules.at (Freezing modules): Likewise.

        * configure.ac (AC_PREREQ): Autoconf 2.60 is now out.
        (AC_CHECK_HEADERS): Assume signal.h.
        (AC_CHECK_HEADERS_ONCE): Use new feature to shrink configure.
        (AC_CHECK_FUNCS_ONCE): Likewise.
        * src/m4.h (includes): Assume signal.h.

2006-07-05  Eric Blake  <ebb9@byu.net>

        Fix all testsuite failures on cygwin.
        * doc/m4.texinfo (Syscmd, Esyscmd): Forward-port updates from
        branch-1_4.  Solves testsuite failure when uninstalled m4 is
        shadowed by redefinition of PATH in libtool wrapper.
        * Makefile.am (module_ldflags): Don't forget AM_LDFLAGS, which
        contains the -no-undefined required by cygwin.
        (TESTS_ENVIRONMENT): Export abs_top_builddir.
        * tests/others.at (misc): Port to platforms where /etc/passwd
        does not exist or does not contain user named root.
        * tests/modules.at (AT_CHECK_M4_MODTEST): Look in correct
        directory.
        * tests/builtins.at (define, divert): Avoid overquoting.
        * tests/generate.awk (new_group): Likewise.

2006-07-05  Gary V. Vaughan  <gary@gnu.org>

        The regs_allocated field in a struct re_pattern_buffer refers
        to the state of a particular re_registers struct when used in
        successive matches using the same compiled pattern.  Avoid a
        SEGV in `renamesyms' resulting from using a new re_registers
        with an existing re_pattern_buffer:

        * modules/gnu.c (m4_pattern_buffer): Wrapper struct for associated
        pattern buffer and registers.
        (m4_regexp_search): New function to call re_regexp_search with
        correctly matched pattern buffer and register instantiations.
        (m4_regexp_compile): Return an m4_pattern_buffer.  Adust all
        callers.

2006-07-04  Gary V. Vaughan  <gary@gnu.org>

        * ltdl/m4/m4-getopt.m4 (M4_GETOPT): Update to take into account
        changes to gnulib getopt.m4 since last build.
        * Makefile.am (src_m4_SOURCES): Only compile shipped getopt module
        if the system getopt fails M4_GETOPT tests.

2006-06-22  Eric Blake  <ebb9@byu.net>

        * Makefile.am (EXTRA_DIST): Distribute gnulib-cache.m4.
        Reported by Bruno Haible.

2006-06-22  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * m4/module.c (m4__module_exit): Avoid ltdl memory leak.

2006-06-19  Eric Blake  <ebb9@byu.net>

        * THANKS: Update.

2006-06-19  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am (src_m4_DEPENDENCIES): Make dependency explicit.
        (clean-local): Split into and depend upon...
        (clean-local-tests, clean-local-src): ...these two.  The latter
        removes the libtool object directory below `src', to work around
        a buglet in Automake, failing to list it.
        (EXTRA_DIST): Distribute modules/perl.c.

2006-06-19  Eric Blake  <ebb9@byu.net>

        * Makefile.am ($(srcdir)/doc/m4.1): No need to list $(srcdir) in
        right side of dependency; VPATH does that.
        (stamp-vcl): Update to use libtool's algorithm.
        (EXTRA_DIST): Distribute stamp-vcl.
        Reported by Ralf Wildenhues.
        (TESTSUITE): Revert earlier change that used absolute path, as
        that broke 'make dist' in VPATH.  Stick with $(srcdir) instead.
        (EXTRA_DIST): Revert earlier change of $(TESTSUITE).
        (TESTS_ENVIRONMENT) [USE_GMP]: Revert earlier addition, since
        atlocal takes care of it instead.
        (check-local, installcheck-local, clean-local): Inline absolute
        path to testsuite here, rather than relative path to testsuite
        elsewhere.

2006-06-19  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * m4/m4private.h (DELETE): Cast away const here...
        * src/stackovf.c (stackovf_exit): ...to avoid cast-as-lvalue here.
        * src/freeze.c (reload_frozen_state): Avoid uninitialized
        variable warning.

2006-06-19  Eric Blake  <ebb9@byu.net>

        * Makefile.am (doc/m4.1): Build in $(srcdir), to match where
        .info pages are built.
        Reported by Ralf Wildenhues.
        (EXTRA_DIST): Inline definition of testsuite, so that make dist
        works again.

2006-06-16  Eric Blake  <ebb9@byu.net>

        Follow recommendations from autoconf manual for autotest.
        * Makefile.am (TESTSUITE): Factor the $(srcdir) out of uses, and
        turn it into an absolute path until autotest provides an option
        that allows us to avoid changing directories.  Properly quote
        throughout.
        (TESTS_ENVIRONMENT) [USE_GMP]: Inform testsuite about GMP.
        (check-recursive): Delete unused target.
        ($(TESTSUITE)): Atomically update testsuite.
        (CD_TESTDIR): Simplify.
        (m4__cd): Delete unused macro.
        (check-local): Let TESTSUITEFLAGS influence the run.
        (installcheck-local): Let TESTSUITEFLAGS override
        AUTOTEST_PATH.  Add dependencies.
        (clean-local): Clean up.
        (DISTCLEANFILES, MAINTAINERCLEANFILES): Add directory location.
        * README: Document how to use the testsuite.

2006-06-15  Eric Blake  <ebb9@byu.net>

        * configure.ac (M4_DEFAULT_PRELOAD): Fix typo in last commit.

        * ltdl/m4/m4-error.m4 (M4_ERROR): Use M4_ instead of m4_ to avoid
        clashes with m4sugar.
        * ltdl/m4/m4-getopt.m4 (M4_GETOPT): Likewise.
        * ltdl/m4/m4-gettext.m4 (M4_GNU_GETTEXT): Likewise.
        * ltdl/m4/m4-obstack.m4 (M4_OBSTACK): Likewise.
        * ltdl/m4/m4-regex.m4 (M4_REGEX): Likewise.
        * ltdl/m4/gmp.m4 (_M4_LIB_GMP): Likewise.
        * ltdl/m4/stackovf.m4 (M4_SYS_STACKOVF): Likewise.
        * ltdl/m4/debug.m4 (M4_CHECK_DEBUGGING): Likewise.
        * configure.ac: Likewise.
        (M4_DEFAULT_PRELOAD): Use as a macro, not shell variable.
        * Makefile.am (src_m4_CPPFLAGS): Use STACKOVF as a makefile
        conditional.
        * ltdl/m4/m4-gnulib.m4: Delete, no longer needed.

        Reduce compiler warnings.  Inside GMP, mpq_t is an array type, so
        const mpq_t is not assignable from plain mpq_t.  Avoid
        type-punning warnings caused trying to mix these types.
        * modules/mpeval.c (numb_ior, numb_eor, numb_and, numb_lshift),
        (numb_rshift, numb_divide, numb_modulo): Remove const qualifier.
        * modules/evalparse.c (or_term, xor_term, and_term, shift_term),
        (mult_term, exp_term): Remove type-punning casts.
        (numb_pow): Remove const qualifier.
        * src/freeze.c (reload_frozen_state): Fix typo in messages.
        Fix variables that can be used uninitialized, which fixes
        security hole where malicious frozen file can execute arbitrary
        code.

2006-06-14  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am (modules_mpeval_la_LIBADD): Readd $(LIBADD_GMP).

2006-06-13  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
        and Eric Blake  <ebb9@byu.net>

        Allow `make dist' to work again.
        * Makefile.am (EXTRA_DIST): doc/helptoman.pl is gone.
        (MAINTAINERCLEANFILES): Avoid redundant mention of dist_man_MANS.
        (cvs-dist): Fix typo.
        * NEWS: Match current version number.

2006-06-13  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * Makefile.am (AM_CPPFLAGS):  Add $(LTDLINCL), so the right
        ltdl.h is used.

        * bootstrap: Do not run libtoolize manually, this is done
        correctly by autoreconf.  Invoke autoreconf with --no-recursive
        to avoid unnecessary rerunning of autotools for libltdl.

2006-06-13  Eric Blake  <ebb9@byu.net>

        * THANKS: Update.

2006-06-12  Eric Blake  <ebb9@byu.net>

        * m4/output.c [HAVE_MKTEMP]: Gnulib provides mkstemp, so don't
        bother with mktemp.
        * src/m4.h: Don't declare mktemp.
        * m4/input.c (m4__next_token): Avoid bzero.
        * configure.ac (AC_CHECK_FUNCS): Remove obsolete checks.
        * Makefile.am (doc/m4.1): Depend on installed help2man, rather
        than distributing outdated helptoman.pl.
        * doc/helptoman.pl: Delete.

2006-06-10  Eric Blake  <ebb9@byu.net>

        * README (Patches): Document the current dependence on CVS
        builds of autotools.
        * ltdl/m4/gnulib-cache.m4: Update, and use --macro-prefix=M4.
        * configure.ac: Use consistent quoting throughout.
        (AC_PREREQ): Bump to 2.59d.
        (AC_INIT): Package name begins with uppercase.
        (AC_ARG_WITH): Use AS_HELP_STRING.
        (AM_INIT_AUTOMAKE): Enable gnits mode.
        (AC_ISC_POSIX, AM_PROG_CC_STDC, AC_PROG_INSTALL, AC_PROG_MAKE_SET),
        (AC_PROG_AWK, AM_C_PROTOTYPES, AC_C_CONST, AC_HEADER_STDC),
        (AC_CHECK_HEADERS, AC_FUNC_ALLOCA, AC_FUNC_VPRINTF): Remove checks
        done by gnulib or automake, or which autoconf has declared
        obsolete.
        * m4/m4private.h (Includes): Assume C89 or better, and use errno
        unconditionally.
        * m4/output.c (Includes): Likewise.
        * modules/gnu.c (Includes): Likewise.
        * modules/m4.c (Includes): Likewise.
        * src/m4.h (Includes): Likewise.

        * README-alpha: Update web address.
        * README: Likewise. Change encoding to ASCII.  Remove old advice
        about cygwin.  Document bootstrapping dependency.
        * AUTHORS: Update from branch-1_4.
        * THANKS: Likewise.  Change encoding to UTF-8.
        * BACKLOG: Delete.  This file is too old and unmaintained to be
        worthwhile.
        * ChangeLog: Change encoding to UTF-8.

        Avoid compiler warnings.
        * m4/macro.c (trace_format): Don't mark this as a printf format,
        since we don't accept the same set of modifiers as printf.  It
        would be nice if gcc let us specify a custom format archetype.
        * src/main.c (main): Cast away const.

2006-06-10  Andreas Schwab  <schwab@suse.de>  (tiny change)
            Eric Blake  <ebb9@byu.net>

        * modules/time.c (ctime): Pass correctly typed variable to
        m4_numeric_arg.
        (gmtime): Likewise.
        (localtime): Likewise.
        (strftime): Likewise.
        * m4/utility.c (m4_numeric_arg): For now, document arbitrary
        limit inherent in this interface.

2006-05-08  Bruno Haible  <bruno@clisp.org>  (tiny change)

        * modules/m4.c (WEXITSTATUS): Provide fallback definition.
        (sysval): Use WEXITSTATUS.
        * modules/gnu.c (esyscmd): Set sysval to 0xffff, to accomodate both
        big-endian and little-endian wait status definitions.

2006-05-06  Eric Blake  <ebb9@byu.net>

        * po/Makevars (MSGID_BUGS_ADDRESS): Add.
        * po/POTFILES.in (src/getopt.c, src/version-etc.c): These files live
        in src, not gnu.

2006-05-06  Eric Blake  <ebb9@byu.net>

        * configure.ac (LT_CONFIG_LTDL_DIR): Inform libtool which
        subdirectory to use.
        (support for -pipe): Move after LT_INIT, since it relies on
        libtool internals.

2006-05-05  Eric Blake  <ebb9@byu.net>

        * Makefile.am (doc/m4.1): Use $@, not $(srcdir)/doc/$@.

        * THANKS: Update.

2006-05-05  Bruno Haible  <bruno@clisp.org>
        and Eric Blake  <ebb9@byu.net>

        * configure.ac (gl_SOURCE_BASE, gl_M4_BASE, gl_MODULES): Move to...
        * ltdl/m4/gnulib-cache.m4: ...this new file, per new gnulib-tool
        usage pattern.
        * bootstrap: Update usage of gnulib-tool.

2006-05-04  Eric Blake  <ebb9@byu.net>

        * Makefile.am (doc/m4.1): Use EXEEXT on built binary.
        Cleanup whitespace.

2005-12-05  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (func_update_po): Synch with CVS GNU tar.  wget 1.9.x
        and 1.10.x support --cache=off, so $WGETFLAGS are not necessary.
        Reported by Eric Blake <ebb9@byu.net>

2005-12-04  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (func_update_po): Test and set $WGETFLAGS to disable
        http caching as -C is no longer supported by wget 1.10.x.
        Reported by Eric Blake <ebb9@byu.net>

2005-10-20  Gary V. Vaughan  <gary@gnu.org>

        * m4/module.c (caller_id): To match libtool-2.0 interface, changed
        to ...
        (iface_id): ...an lt_dlinterface_id type.
        (m4__module_find): New abstraction for lt_dlhandle_fetch.  Use
        throughout, instead of calling obsolete lt_dlhandle_find directly.
        (m4__module_next): Use multiloader-safe lt_dlhandle_iterate.  Use
        throughout, instead of calling obsolete lt_dlhandle_next.
        * m4/m4private.h (m4__module_find): Declare it.
        * m4/builtin.c (m4_builtin_find_by_name, m4_builtin_find_by_func):
        Use m4__module_next instead of obsolete lt_dlhandle_next.

2005-10-20  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (func_update_po): Update pofiles directly from the
        translation project.
        * po/LINGUAS, po/cs.po, po/de.po, po/el.po, po/fr.po, po/it.po,
        po/ja.po, po/nl.po, po/pl.po, po/ru.po, po/sv.po: No need to store
        these files under source control anymore.
        Suggested by Eric Blake <ebb9@byu.net>

2005-07-07  Paul Eggert  <eggert@cs.ucla.edu>

        * ltdl/m4/m4-gnulib.m4: Update FSF contact address.  Somehow this
        file escaped the address updates on 2005-05-01.

2005-07-07  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap: Allow user overriding of gnulib-tool location, and
        correctly determine module source directories whether gnulib-tool
        is given as a relative or absolute path, or is found by searching
        PATH.
        Reported by Eric Blake <ebb9@byu.net>

2005-07-07  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

        * ltdl/m4/debug.m4 (m4_CHECK_DEBUGGING): Make sure that both $rm
        and $RM are defined for various versions of
        AC_LIBTOOL_COMPILER_OPTION.

        * bootstrap (AUTORECONF): New variable to allow user overriding of
        autoreconf path.

2005-07-07  Gary V. Vaughan  <gary@gnu.org>

        * doc/m4.texinfo (History): Add better notes on the ancestory of
        GNU m4, and other historical interest.

2005-05-08  Gary V. Vaughan  <gary@gnu.org>

        * m4/symtab.c (m4_symbol_rename): New function that performs a low
        level symbol rename.
        * m4/m4module.h (m4_symbol_rename): Declare it as part of the API.
        * modules/gnu.c (regsub): Factored out of m4_epatsubst_do...
        (m4_patsubst_do, m4_renamesyms_do): ...wrappers that use
        regsub...
        (erenamesyms, renamesyms): ...builtins that use these to implement
        macro renaming by regular expression.
        * doc/m4.texinfo (Erenamesyms and Renamesyms): Document them.
        * tests/generate.awk: Allow some forbidden `m4_' prefixed symbols
        to stop the new generated tests from choking.

2005-05-07  Gary V. Vaughan  <gary@gnu.org>

        Since most of the build is handled from a single Makefile.am now,
        we can teach make about the dependencies between the m4 binary and
        the preopened modules it is built against:

        * configure.ac (PREOPEN_DEPENDENCIES): Substitute for a list of
        preopened modules.
        * Makefile.am (src_m4_DEPENDENCIES): Rebuild the m4 program if any
        of the preopened modules have changed.

2005-05-07  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac (gl_MODULES): Add mkstemp for machines that don't
        have a native implementation.

2005-05-06  Gary V. Vaughan  <gary@gnu.org>

        * src/m4.h (EXIT_SUCCESS, EXIT_FAILURE): Removed.  These are
        handled already by gnu/exit.h.

        * configure.ac (gl_MODULES): Add assert to support a
        --disable-assert configure time option for NDEBUG setting.

        * Makefile.am (src_m4_SOURCES): Add version-etc-fsf.c.
        * bootstrap (src_modules): Add version-etc-fsf.
        * src/main.c (version_etc_copyright): Removed.

        * ltdl/m4/m4-getopt.m4 (m4_GETOPT): Synch with gnulib/getopt.m4.

2005-05-04  Gary V. Vaughan  <gary@gnu.org>

        * src/m4.h (__CYGWIN__, WIN32): Canonicalise Windows and Cygwin
        recognition macros.
        * src/freeze.c (produce_frozen_state): Use \n line-endings even
        on Windows, so that the frozen file reader will work.
        Reported by Josef T. Burger <bolo@bolo.com>

2005-05-04  Vincent Lonngren  <Vincent.lonngren.759@student.lu.se>

        Forward port of a patch that allowed m4-1.4.2 to compile on
        QNX 6.3:

        * configure.ac (AC_CHECK_HEADERS):  Add signal.h,
        sys/signal.h.
        * src/m4.h: And include them as appropriate.
        * src/main.c, src/stackovf.h: Don't include signal.h literally;
        m4.h will include the correct file.

2005-05-04  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4private.h: Make errno visible for the sources patched
        below.

2005-05-04  Paul Eggert  <eggert@twinsun.com>

        * src/main.c (print_program_name_CB): Preserve errno, since
        M4ERROR relies on this.
        * modules/gnu.c (m4_esyscmd): Clear errno before calling popen.
        * modules/m4.c (m4_maketemp): Clear errno before calling mkstemp.
        * m4/path.c (m4_path_search): Don't let "free" trash errno when
        returning NULL.

        * m4/output.c (m4_insert_file): Don't assume errno has a valid
        value simply because fread returns zero.  This fixes a
        portability bug reported by Marion Hakanson in
        <http://lists.gnu.org/archive/html/bug-m4/2004-07/msg00029.html>.

2005-05-04  Santiago Vila  <sanvila@debian.org>

        * tests/stackovf.test: Use tempfile if available.

2005-05-04  Robert Bihlmeyer  <robbe@orcus.priv.at>  (tiny change)

        http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=92629
        * m4/output.c (m4_insert_file): Do not mix buffered and
        unbuffered I/O, as this breaks on the Hurd.

2005-05-04  Gary V. Vaughan  <gary@gnu.org>

        Gnulib has changed again.  Reimport.  Adjust.  Rinse.  Repeat.
        Automake and Libtool now agree on subdir-objects and LTLIBOBJS,
        and libtoolize does a better job of ltdl importing now too, so
        take advantage of that while updating the tree:

        * acm4, config: Moved from here...
        * ltdl/m4, ltdl/config: ...to here.
        * doc/Makefile.am, m4/Makefile.am, modules/Makefile.am,
        src/Makefile.am, tests/Makefile.am: Removed...
        * Makefile.am: ...and migrated to here, with adjustments to
        compensate for relative path differences.
        * commit: Adjust relative paths.
        * configure.ac: Adjust relative paths.
        (AC_PREREQ): 2.59 isn't strictly new enough, we also need a
        patch.
        (LT_PREREQ): 2.0 isn't released yet, but will work when it is!  In
        the meanwhile, CVS HEAD libtool is needed.
        (AM_INIT_AUTOMAKE): Added subdir-objects declaration. 1.9.5 isn't
        stricly new enough, we also need a patch.
        (AM_PROG_CC_C_O): Required for subdir-objects in Automake.
        (AC_WITH_LTDL): Replaced with LT_WITH_LTDL.
        (gl_MODULES): Don't list getopt and version-etc, as they don't
        belong in libm4.
        * bootstrap: After running gnulib-tool to import the listed
        modules, fetch getopt and version-etc into src manually.
        (ltdldir): Change to ltdl.
        * src/main.c: Adjust for changes in version-etc API.
        * ltdl/m4/m4-getopt.m4: New macro to mirror gnulib's getopt.m4,
        but works when the getopt module isn't to be included in the lib.
        * README: Add note about patching autoconf and automake to
        bootstrap CVS m4.

2005-05-02  Matt Kraai  <kraai@debian.org>  (tiny change)

        http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=84416
        * doc/m4.texinfo (Maketemp): Change maketemp to refer to a new,
        empty file rather than to a nonexistent file.  This closes a
        common security hole.
        * modules/m4.c (m4_maketemp): Implement the above, by using
        mkstemp rather than mktemp.

2005-05-01  Gary V. Vaughan  <gary@gnu.org>

        The FSF are moving offices today.  Changed their contact address
        in all files from `59 Temple Place, Suite 330, MA 02111-1307' to
        `51 Franklin Street, Fifth Floor, MA 02110-1301'.

2005-03-11  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>  (tiny change)

        * tests/Makefile (clean-local): Ignore testsuite cleanup
        failures.

2005-03-11  Per Bothner  <per@bothner.com>  (tiny change)

        * tests/Makefile (clean-local): Only run the testsuite cleanup
        if the testsuite has been generated.

2005-02-11  Stepan Kasal  <kasal@ucw.cz>

        * TODO: slight clarification of the example of qindir usage.

2005-02-08  Gary V. Vaughan  <gary@gnu.org>

        * TODO: Add qindir requirement, and defn bug.
        From Stepan Kasal  <kasal@ucw.cz>

2005-02-08  Stepan Kasal  <kasal@ucw.cz>

        * TODO: Add ``execution stack'', fix a typo.
        * doc/m4.texinfo: Typos.

2004-12-24  Eric Blake  <ebb9@byu.net>

        * configure.ac (INCLUDE_STDBOOL_H): Account for gnulib's move
        to the gnu subdirectory.
        * acm4/m4-error.m4 (INCLUDE_ERROR_H): Likewise.
        * acm4/m4-obstack.m4 (INCLUDE_OBSTACK_H): Likewise.
        * acm4/m4-regex.m4 (INCLUDE_REGEX_H): Likewise.
        * m4/system_.h: Likewise, in non-configured includes.

2004-10-14  Noah Misch  <noah@cs.caltech.edu>,
            Gary V. Vaughan  <gary@gnu.org>

        * m4/m4.c (m4_context_field_table, m4_context_opt_bit_table):
        Protect definitions from macro expansion under -DNDEBUG by
        parenthesising the expanded function names.
        * m4/syntax.c (m4_get_syntax_lquote, m4_get_syntax_rquote)
        (m4_get_syntax_bcomm, m4_get_syntax_ecomm)
        (m4_is_syntax_single_quotes, m4_is_syntax_single_comments)
        (m4_is_syntax_macro_escaped): Similarly protect function
        definitions from macro expansion under -DNDEBUG by #undefing the
        matching macro names before each definition.  Also, move all the
        function definitions to the end of the file so that any
        invocations in the rest of the file pick up the fast macro
        versions.
        * m4/m4private.h (m4_set_symbol_table, m4_set_syntax_table)
        (m4_set_debug_file, m4_set_trace_messages)
        (m4_set_warning_status_opt, m4_set_no_gnu_extensions_opt)
        (m4_set_nesting_limit_opt, m4_set_debug_level_opt)
        (m4_set_max_debug_arg_length_opt): New fast macro versions of the
        option setter functions.

2004-09-23  Gary V. Vaughan  <gary@gnu.org>

        * po/POTFILES.in: Reflect move of gnulib files from gnulib/m4
        to gnu.

2004-09-23  Gary V. Vaughan  <gary@gnu.org>

        * src/main.c: Include gnulib files from the correct directory.

        * gnulib/*: Don't store any of the gnulib files in arch, as they
        generate spurious changes.
        * Makefile.am (ACLOCAL_AMFLAGS): Remove gnulib/acm4 since the
        gnulib macros now share our macro directory.
        (SUBDIRS): Descend into `gnu' rather than `gnulib'.
        * bootstrap: Call gnulib-tool to import from the gnulib tree.
        (gl_AC_HEADER_INT_TYPES_H, gl_AC_HEADER_STDINT_H,
        gl_AC_TYPE_UINTMAX_T): Patch gnulib.m4 to define these in terms of
        the gettext macros from autopoint that overwrite the gnulib-tool
        imported versions.  Import sources and Makefile.am into the `gnu'
        directory.  Changed all callers.
        * configure.ac (gl_EARLY, gl_SOURCE_BASE, gl_M4_BASE, gl_MODULES,
        gl_INIT): Call these gnulib-tool macros instead of the hardcoded
        for imported modules.
        * acm4/m4-error.m4, acm4/m4-gettext.m4, acm4/m4-obstack.m4,
        acm4/m4-regex.m4: Use AC_BEFORE to enforce ordering rather than
        hardcoding the gnulib macros they wrap.

2004-07-15  Gary V. Vaughan  <gary@gnu.org>

        Latest CVS libtool can preload modules in libraries, including
        its own module loaders!  Tweak m4 so that it doesn't try to treat
        libltdl's module loaders as m4 modules when freezing and on exit:

        * gnulib/acm4/*.m4: Don't store these files in arch since they
        generate spurious changes.
        * bootstrap: Simplify initial libtoolize call, since CVS
        libtoolize is smarter these days.
        * doc/Makefile.am (%.1): Make the helptoman call work with a VPATH
        build.
        * m4/module.h (m4__module_exit): Missing declaration.
        * m4/m4private.h (m4__module_next): New function declaration.
        * m4/module.c (m4__module_next): lt_dlhandle_{firs,nex}t
        encapsulation.  Changed all callers.
        (m4__module_interface): New function to verify m4 loadable module
        interfaces.
        (m4__module_init): Register the interface validator.
        (m4__module_exit): Only close my own modules.
        * modules/m4.c (unistd.h): Provide missing declaration.
        (m4_set_sysval, m4_sysval_flush, m4_dump_symbols)
        (m4_expand_ranges): More missing declarations.
        * modules/modtest.c (export_test): Ditto.
        * src/Makefile.am (AM_CPPFLAGS): Add libltdl directory.
        * src/main.c (main): Bump copyright year.
        * tests/modules.at: Fix sed syntax error.


2004-06-17  Gary V. Vaughan  <gary@gnu.org>

        Tweaking to enable compilation with latest CVS libtool and
        libltdl.  We can't just dump the library files directly into the
        m4 directory anymore now that libltdl is built from pieces itself:

        * bootstrap: Rewritten to use latest libtoolize sanely, and to
        set up libltdl subdirectory.
        * configure.ac (AC_CONFIG_AUX_DIR): Point to our own, not the
        gnulib subdirectory's config.
        (TIMESTAMP): Use $ac_aux_dir for VPATH builds.
        (m4_pattern_forbid): Remove the cruft to deal with renamed jm_
        macros from gnulib.
        (AC_LIB_LTDL): Latest libltdl is a sub-project with its own
        configure.ac, so use AC_WITH_LTDL instead.
        * Makefile.am (SUBDIRS): Add libltdl.
        * acm4/m4-regex.m4 (jm_INCLUDED_REGEX): Updated.  gnulib now uses
        gl_INCLUDED_REGEX.
        * m4/Makefile.am (AM_CPPFLAGS): Add INCLTDL.
        (libm4_la_SOURCES): Remove ltdl.c and ltdl.h.
        (libm4_la_LIBADD): Add LIBLTDL.
        * m4/ltdl.c, m4/ltdl.h: Removed.
        * m4/m4module.h: Include canonical ltdl.h.
        * po/*.po: Updated.

2004-06-14  Gary V. Vaughan  <gary@gnu.org>

        * gnulib/import: Now updates makefile fragments, and configure.ac.
        * gnulib/m4/gnulib.am: New file.  Generated makefile fragments.
        * gnulib/m4/Makefile.am: include it.
        * gnulib/acm4/intmax.m4, gnulib/acm4/longdouble.m4,
        gnulib/acm4/longlong.m4, gnulib/acm4/printf-posix.m4,
        gnulib/acm4/signed.m4, gnulib/acm4/size_max.m4,
        gnulib/acm4/wchar_t.m4, gnulib/acm4/wint_t.m4,
        gnulib/acm4/xsize.m4: New macro files from latest gnulib import.
        * gnulib/acm4/alloca.m4, gnulib/acm4/inttypes_h.m4,
        gnulib/acm4/lib-ld.m4, gnulib/acm4/lib-prefix.m4,
        gnulib/acm4/error.m4, gnulib/acm4/po.m4, gnulib/acm4/regex.m4,
        gnulib/acm4/stdbool.m4, gnulib/acm4/stdint_h.m4,
        gnulib/acm4/uintmax_t.m4, gnulib/acm4/ulonglong.m4,
        gnulib/acm4/unlocked-io.m4, gnulib/acm4/xalloc.m4,
        gnulib/acm4/free.m4, gnulib/acm4/gettext.m4,
        gnulib/acm4/glibc21.m4: Updated macro files from latest gnulib
        import.
        * gnulib/m4/getopt_int.h: New source file from latest gnulib
        import.
        * gnulib/m4/alloca.c, gnulib/m4/alloca_.h, gnulib/m4/getopt1.c,
        gnulib/m4/obstack.c, gnulib/m4/obstack.h, gnulib/m4/regex.c,
        gnulib/m4/unlocked-io.h, gnulib/m4/version-etc.c,
        gnulib/m4/xmalloc.c, gnulib/m4/getopt.c, gnulib/m4/getopt.h:
        Updated source files from latest gnulib.

2004-02-29  Gary V. Vaughan  <gary@gnu.org>

        * config/mailnotify: New file for mailing commit notifications,
        imported from cvs-utils.
        * commit: Updated from cvs-utils and tweaked for m4.

2003-12-01  Gary V. Vaughan  <gary@gnu.org>

        * config/mkstamp: Updated from CVS libtool.
        * configure.ac: Generate a gnu coding standards compliant version
        number, and use it for the banner.
        * Makefile.am (stamp-vcl): New rules to force m4 to be regenerated
        mhen the TIMESTAMP changes in ChangeLog, but the file modification
        time doesn't (e.g. in cvs commit).  Otherwise dist tarballs will
        contain the previous version number.
        * src/main.c: Make --version output conform to the GNU standard.

        * configure.ac (AM_INIT_AUTOMAKE): Require 1.7g...
        * modules/Makefile.am (gnu_la_SOURCES, load_la_SOURCES,
        m4_la_SOURCES, traditional_la_SOURCES, modtest_la_SOURCES,
        shadow_la_SOURCES, import_la_SOURCES, stdlib_la_SOURCES,
        time_la_SOURCES): ...so that these are defaulted correctly, and
        can be removed from this file.
        (AM_LDFLAGS): Add -module...
        (gnu_la_LDFLAGS, load_la_LDFLAGS, m4_la_LDFLAGS,
        traditional_la_LDFLAGS, modtest_la_LDFLAGS, shadow_la_LDFLAGS,
        import_la_LDFLAGS, stdlib_la_LDFLAGS, time_la_LDFLAGS): ...so that
        the individual settings can be removed.
        * m4/Makefile.am (libm4_la_LIBADD): Add $(LTLIBINTL) here once...
        * module/Makefile.am (gnu_la_LIBADD, load_la_LIBADD,
        m4_la_LIBADD, traditional_la_LIBADD, modtest_la_LIBADD,
        shadow_la_LIBADD, import_la_LIBADD, stdlib_la_LIBADD,
        time_la_LIBADD): ...so that these are picked up as a deplib of
        libm4 and don't need to be set explicitly.

2003-11-18  Gary V. Vaughan  <gary@gnu.org>

        * modules/Makefile.am (pkglibexec_LTLIBRARIES): Remove perl.la
        from the standard build.  It is too fragile.

        * gnulib/acm4/libtool.m4, m4/ltdl.c, m4/ltdl.h: Reimported from
        CVS libtool after merging m4 changes across to libtool.

        * m4/symtab.c (m4_symtab_create): Fix a careless use of sizeof.
        * m4/path.c (search_path_add): Ditto.

2003-11-13  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac (AC_LIBTOOL_TAGS): Don't include shell code for
        libtool tags we don't use in configure.  This reduces the size
        of the script from over 1Mb to under 700Kb.

2003-11-13  Gary V. Vaughan  <gary@gnu.org>

        The import script was not written properly, and the last gnulib
        import was incomplete.  Fixed that problem, and reimport our
        gnulib dependencies, which picks up the address calculation
        overflow checks described by Paul below.  Also tweak the clients
        of the gnulib xalloc module not to use deprecated macros:

        * gnulib/import: Recurse through module dependencies rather than
        naively descending only one level.
        * configure.ac: Add calls to gnulib's strnlen and extension module
        macros.
        * gnulib/m4/Makefile.am: Add snippets from gnulib's strnlen and
        extension modules.
        * gnulib/acm4/extensions.m4, gnulib/acm4/xalloc.m4,
        gnulib/m4/alloca.c, gnulib/m4/obstack.c, gnulib/m4/obstack.h,
        gnulib/m4/stdbool_.h, gnulib/m4/unlocked-io.h, gnulib/m4/xalloc.h,
        gnulib/m4/xmalloc.c, gnulib/m4/xstrdup.c: Updated from CVS
        gnulib.
        * gnulib/acm4/libtool.m4: Updated from CVS libtool.
        * m4/hash.c (m4_get_hash_iterator_next): Use `xzalloc (S)' in
        place of `xcalloc (1, S)'.
        * m4/m4.c (m4_create): Likewise.
        * m4/m4private.h (m4_symbol_value_create): Likewise.
        * m4/symtab.c (symtab_fetch): Likewise.
        * m4/syntax.c (m4_syntax_create): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * m4/path.c (search_path_add): Eliminate use of deprecated NEW
        macro.
        * m4/symtab.c (m4_symtab_create): Likewise.

2003-11-13  Gary V. Vaughan  <gary@gnu.org>

        * tests/module.at: Comment typo.

2003-10-10  Gary V. Vaughan  <gary@gnu.org>

        * tests/modules.at (modules: importing): Apply some lateral
        thinking, and use AT_CHECK to compare the output of a sed pass
        over stderr against the canonical strerror string.

        * tests/modules.at (modules: importing): Edit the generated stderr
        output to canonicalize strerror output, before a comparison.

2003-10-10  Gary V. Vaughan  <gary@gnu.org>

        Tru64UNIX perl is sloppy with namespace pollution.  This patch is
        careful not to trip over the mess:

        * modules/perl.c: Some builds of perl install headers that contain
        `#define try __builtin_try'.  Be sure to undefine that macro
        before `m4/hash.h' gets included, which uses the `try' symbol.
        * m4/system_.h: Similarly for `bool'.  Undefine `bool', `true' and
        `false' before including `stdbool.h'.
        (DELETE):  This symbol is not in m4's namespace, and is in any
        case only used internally...
        * m4/m4private.h (DELETE): ...so move it to here.
        Reported by Martin MOKREJS <mmokrejs@natur.cuni.cz>

2003-10-08  Paul Eggert  <eggert@twinsun.com>

        Don't use XMALLOC and XCALLOC.  Once we install the
        corresponding patch into gnulib, this will fix some
        address-calculation overflow bugs on hosts where calloc (A, B)
        returns garbage when A*B overflows.

        * m4/hash.c (m4_hash_new, node_new, m4_hash_resize,
        maybe_grow, m4_get_hash_iterator_next): Replace XMALLOC with
        xmalloc, XCALLOC with xcalloc.
        * m4/m4.c (m4_create): Likewise.
        * m4/m4private.h (m4_symbol_value_create): Likewise.
        * m4/output.c (m4_output_init): Likewise.
        * m4/symtab.c (symtab_fetch, m4_set_symbol_traced): Likewise.
        * m4/syntax.c (remove_syntax_attribute): Likewise.
        * src/freeze.c (reload_frozen_state): Likewise.
        * src/main.c (main): Likewise.

2003-10-07  Gary V. Vaughan  <gary@gnu.org>

        * Makefile.am (ACLOCAL_AMFLAGS): Search in the new acm4 and
        gnulib/acm4 directories for aclocal m4 macros.
        * gnulib/Makefile.am (EXTRA_DIST): Removed.
        (MAINTAINERCLEANFILES): Add Makefile.in.
        * configure.ac (m4_GNULIB_MODULES): Use it to declare which gnulib
        modules we use.
        * acm4/m4-gnulib.m4 (m4_GNULIB_MODULES): New macro.
        * gnulib/import: New file.  Temporary script for updating gnulib
        imported files, until gnulib-tool is working.
        * gnulib/config/codeset.m4, gnulib/config/error.m4,
        gnulib/config/exitfail.m4, gnulib/config/extensions.m4,
        gnulib/config/getopt.m4, gnulib/config/gettext.m4,
        gnulib/config/glibc21.m4, gnulib/config/iconv.m4,
        gnulib/config/intdiv0.m4, gnulib/config/inttypes-pri.m4,
        gnulib/config/inttypes.m4, gnulib/config/inttypes_h.m4,
        gnulib/config/isc-posix.m4, gnulib/config/lcmessage.m4,
        gnulib/config/lib-ld.m4, gnulib/config/lib-link.m4,
        gnulib/config/lib-prefix.m4, gnulib/config/malloc.m4,
        gnulib/config/nls.m4, gnulib/config/obstack.m4,
        gnulib/config/onceonly_2_57.m4, gnulib/config/po.m4,
        gnulib/config/progtest.m4, gnulib/config/realloc.m4,
        gnulib/config/regex.m4, gnulib/config/restrict.m4.
        gnulib/config/stdbool.m4, gnulib/config/stdint_h.m4,
        gnulib/config/strerror_r.m4, gnulib/config/strndup.m4,
        gnulib/config/strnlen.m4, gnulib/config/strtol.m4,
        gnulib/config/uintmax_t.m4, gnulib/config/ulonglong.m4,
        gnulib/config/unlocked-io.m4, gnulib/config/xalloc.m4,
        gnulib/config/xstrndup.m4: Removed.
        * gnulib/acm4/alloca.m4, gnulib/acm4/codeset.m4,
        gnulib/acm4/error.m4, gnulib/acm4/exitfail.m4,
        gnulib/acm4/extensions.m4, gnulib/acm4/free.m4,
        gnulib/acm4/getopt.m4, gnulib/acm4/gettext.m4,
        gnulib/acm4/glibc21.m4, gnulib/acm4/iconv.m4,
        gnulib/acm4/intdiv0.m4, gnulib/acm4/inttypes-pri.m4,
        gnulib/acm4/inttypes.m4, gnulib/acm4/inttypes_h.m4,
        gnulib/acm4/isc-posix.m4, gnulib/acm4/lcmessage.m4,
        gnulib/acm4/lib-ld.m4, gnulib/acm4/lib-link.m4,
        gnulib/acm4/lib-prefix.m4, gnulib/acm4/malloc.m4,
        gnulib/acm4/nls.m4, gnulib/acm4/obstack.m4,
        gnulib/acm4/onceonly_2_57.m4, gnulib/acm4/po.m4,
        gnulib/acm4/progtest.m4, gnulib/acm4/realloc.m4,
        gnulib/acm4/regex.m4, gnulib/acm4/restrict.m4.
        gnulib/acm4/stdbool.m4, gnulib/acm4/stdint_h.m4,
        gnulib/acm4/strerror_r.m4, gnulib/acm4/strndup.m4,
        gnulib/acm4/strnlen.m4, gnulib/acm4/strtol.m4,
        gnulib/acm4/uintmax_t.m4, gnulib/acm4/ulonglong.m4,
        gnulib/acm4/unlocked-io.m4, gnulib/acm4/xalloc.m4,
        gnulib/acm4/xstrndup.m4: Reimported from CVS gnulib with
        gnulib/import script.
        * gnulib/m4/alloca.c, gnulib/m4/alloca_.h, gnulib/m4/error.c,
        gnulib/m4/error.h, gnulib/m4/exitfail.c, gnulib/m4/free.c,
        gnulib/m4/malloc.c, gnulib/m4/obstack.c, gnulib/m4/obstack.h,
        gnulib/m4/realloc.c, gnulib/m4/regex.c, gnulib/m4/strtol.c,
        gnulib/m4/version-etc.c, gnulib/m4/version-etc.h,
        gnulib/m4/xalloc.h, gnulib/m4/xmalloc.c: Updated from CVS
        gnulib with gnulib/import script.
        * configure.ac, gnulib/m4/Makefile.am: Manually insert anticipated
        guards ready for gnulib-tool to autoupdate on import.
        * config/debug.m4, config/gmp.m4, config/m4-error.m4,
        config/m4-gettext.m4, config/m4-obstack.m4, config/m4-regex.m4,
        config/stackovf.m4: Moved from here...
        * acm4/debug.m4, acm4/gmp.m4, acm4/m4-error.m4,
        acm4/m4-gettext.m4, acm4/m4-obstack.m4, acm4/m4-regex.m4,
        acm4/stackovf.m4: ...to here, to separate aclocal macros from
        configure time helper scripts.
        * config/error.m4: Removed; superceded by gnulib/acm4/error.m4.
        * m4/hash.c, m4/m4.c, m4/macro.c, m4/module.c, m4/output.c,
        m4/path.c, m4/symtab.c, m4/syntax, m4/system_.h, modules/m4.c,
        src/main.c, src/stackovf.c: s/xfree/free/g to comply with new
        gnulib xalloc.h.
        * src/main.c (version_etc_copyright): Only output the current
        year.
        (version_etc): Call with new variadic API.

2003-09-16  Gary V. Vaughan  <gary@gnu.org>

        * gnulib/m4/version-etc.c, gnulib/m4/version-etc.h: Import
        version-etc module from CVS gnulib.
        * po/POTFILES.in: Add gnulib/m4/version-etc.c.
        * src/Makefile.am: Build it.
        * src/main.c: Use it.

        * gnulib/m4/exit.h: Import exit module from CVS gnulib.
        * gnulib/m4/Makefile.am (pkginclude_HEADERS): Add exit.h.
        * m4/system_.h: Don't define EXIT_SUCCESS and FAILURE, include
        exit.h instead.

2003-09-15  Charles Wilson  <cygwin@cwilson.fastmail.fm>,
            Gary V. Vaughan  <gary@gnu.org>

        * bootstrap: Separate options.
        * configure.ac (AM_GNU_GETTEXT_VERSION): Bump to 0.12.1.
        * gnulib/m4/Makefile.am (stdbool.h): Use srcdir, gnulib_srcdir is
        not set.
        * modules/Makefile.am (gnu_la_LIBADD, load_la_LIBADD)
        (m4_la_LIBADD, mpeval_la_LIBADD, traditianal_la_LIBADD)
        (modtest_la_LIBADD, import_la_LIBADD, perl_la_LIBADD)
        (shadow_la_LIBADD, stdlib_la_LIBADD, time_la_LIBADD): Add
        $(LTLIBINTL) for gettext support on cygwin.
        * src/Makefile.am (m4_LDADD): Remove $(INTLLIBS), since we now
        have $(LTLIBINTL) from the preloaded module la files.
        * README: Remove the warning about using --disable-nls on Windows
        machines.

2003-09-15  Gary V. Vaughan  <gary@gnu.org>

        * gnulib/m4/regex.c:  s/<regex.h>/"regex.h"/ or else the compiler
        picks up the system regex.h if gl_REGEX decides gnulib/m4/regex.c
        is required.

2003-09-12  Gary V. Vaughan  <gary@gnu.org>

        * doc/STYLE: Document the gnulib header naming conventions, and
        #include policy.
        * gnulib/m4/error_.h, gnulib/m4/gettext_.h, gnulib/m4/obstack_.h,
        gnulib/m4/regex_.h: Renamed to gnulib/m4/error.h,
        gnulib/m4/gettext.h, gnulib/m4/obstack.h, gnulib/m4/regex.h
        respectively.
        * gnulib/m4/Makefile.am: Remove the rules to build these headers.

        * gnulib/m4/strtol.c, gnulib/config/strtol.m4: Import strtol
        module from CVS gnulib.
        * configure.ac (AC_REPLACE_FUNCS): Remove strtol.
        (gl_FUNC_STRTOL): In favour of the module macro.

2003-09-12  Gary V. Vaughan  <gary@gnu.org>

        Replace the getopt code with CVS gnulib getopt.  The source files
        detect whether they are in a glibc environment and preprocess away
        all of the code if there is a system getopt, so we can compile
        them into the m4 executable unconditionally:

        * gnulib/m4/getopt.c, gnulib/m4/getopt1.c, gnulib/m4/getopt.h,
        gnulib/config/getopt.m4: Import getopt module from CVS gnulib.
        * configure.ac (gl_GETOPT): Use this instead of homebrew inline
        macros.
        * src/getopt.c, src/getopt1.c, src/gnu-getopt.h: Removed old
        version.
        * src/Makefile.am: Adjust.
        * src/main.c: Always include our shipped getopt.h.
        * po/POTFILES.in: Use new location of getopt.c.

2003-09-12  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac (AC_CONFIG_FILES): Remove config/Makefile.
        * config/Makefile.am: Removed.  Automake 1.8 distributes the files
        in this directory automatically.
        * Makefile.am (EXTRA_DIST): Except config/mkstamp.

        * configure.ac (pkglibexecdir): Don't try and set it here, PACKAGE
        isn't set yet.
        * m4/Makefile.am (MODULE_PATH): Removed. Calculate pkglibexecdir
        inline.
        * modules/Makefile.am (pkglibexecdir): Set it here.
        (pkgmodincdir): Renamed to pkgmodincludedir).  Changed all clients.

        * gnulib/m4/regex.c, gnulib/m4/regex_.h, gnulib/config/regex.m4:
        Import regex module from CVS gnulib.
        * gnulib/config/restrict.m4: Ditto for dependee module restrict.
        * config/m4-regex.m4 (m4_REGEX): Wrap gnulib/config/regex.m4, but
        do extra substitutions for Makefile.
        * configure.ac: Use it.
        * gnulib/m4/Makefile.am: Maybe install regex.h after linking it
        from regex_.h if necessary.
        * m4/system_.h: Include the correct version of regex.h.
        * m4/regex.c, m4/regex.h, config/regex.m4: Removed legacy
        version.
        * po/POTFILES.in: Use new location of regex.c.

        * gnulib/m4/Makefile.am (EXTRA_DIST): Removed malloc.c and
        realloc.c: automake distributes these files already.

2003-09-12  Gary V. Vaughan  <gary@gnu.org>

        Replace the xstrzdup code by importing the xstrndup module from
        CVS gnulib, along with its dependencies: strndup and strnlen:

        * gnulib/m4/xstrndup.c, gnulib/m4/xstrndup.h,
        gnulib/config/xstrndup.m4: Import xstrndup module from CVS
        gnulib.
        * gnulib/m4/strndup.c, gnulib/m4/strndup.h,
        gnulib/config/strndup.m4: Ditto wrt strndup.
        * gnulib/m4/strnlen.c, gnulib/config/strnlen.m4: Ditto wrt
        strnlen.
        * gnulib/m4/Makefile.am: Add rules from newly imported modules.
        However, contrary to gnulib, we install xstrndup.h.
        * configure.ac (AC_REPLACE_FUNCS): Remove xstrzdup.
        * gnulib/lib/xstrzdup.c: Delete.  This was never a gnulib file, it
        is an artifact of the old m4 portability layer.
        * configure.ac (gl_XSTRNDUP): This is the gnulib equivalent.
        * m4/system_.h: Include xstrndup.h.
        * m4/macro.c (process_macro): Call xstrndup, not xstrzdup.

2003-09-11  Gary V. Vaughan  <gary@gnu.org>

        Reimport the latest xalloc module from CVS gnulib, and adjust the
        m4 sources to take advantage of xalloc xfree.  Also create a new
        macro DELETE with the same semantics as the old m4 XFREE macro,
        and carefully tweak callers:

        * gnulib/config/xalloc.m4, gnulib/m4/xalloc.h: Updated from CVS
        gnulib.
        * m4/utility.c (xfree): Removed.  This function is now supplied by
        gnulib xalloc.
        * m4/m4private.h (WITH_DMALLOC): Removed XFREE redefine.
        * m4/path.c (search_path_add): Use NEW macro from xalloc.h.
        * m4/symtab.c (m4_symtab_create): Ditto.
        * m4/system_.h: Removed XFREE redefine.
        (DELETE): New macro with same functionality as the original m4
        XFREE macro, but based on xalloc.h now.  Changed all callers.
        * src/main.c (main): Use XMALLOC macro.
        * m4/hash.c, m4/macro.c, m4/symtab.c, m4/syntax.c: Use xfree
        instead of XFREE.
        * m4/output.c (m4_output_exit): Use DELETE instead of XFREE.

2003-09-10  Gary V. Vaughan  <gary@gnu.org>

        Import the xalloc module from CVS gnulib, along with its
        dependencies: exitfail, malloc and realloc. We had different
        semantics for our XFREE and a function xfree() not supplied by
        gnulib, so also a bit of work to keep everything running
        smoothly:

        * configure.ac (AC_REPLACE_FUNCS): Removed xmalloc and xstrdup.
        (gl_XALLOC): Use gnulib equivalents.
        * gnulib/config/exitfail.m4, gnulib/m4/exitfail.h,
        gnulib/m4/exitfail.c: Import exitfail module from CVS gnulib.
        * gnulib/config/malloc.m4, gnulib/m4/malloc.c: Ditto wrt malloc.
        * gnulib/config/realloc.m4, gnulib/m4/realloc.c: Ditto wrt
        realloc.
        * gnulib/config/xalloc.m4, gnulib/m4/xalloc.h,
        gnulib/m4/xmalloc.c, gnulib/m4/xstrdup.c: Ditto wrt xalloc.
        * gnulib/m4/Makefile.am: Add fragment from gnulib for newly
        imported modules.
        (pkgincdir): Removed.  Use pkgincludedir instead.
        * m4/m4private.h (XFREE): xfree already checks for NULL.
        * m4/system_.h: Use xalloc module, and remove macros already
        supplied by xalloc.h.
        * m4/utility.c (xfree): xalloc does not yet implement xfree, so
        moved the old definition from m4/xmalloc.c to here for now.

2003-09-09  Gary V. Vaughan  <gary@gnu.org>

        Import the error and progname modules from CVS gnulib.  Our old
        error.c subsumed the functionality of both, so a little adjustment
        was required to accomodate the split in sources.  Also added more
        wrapper macros to choose between a system installed error.h or our
        shipped gnulib error module:

        * m4/error.c, m4/error.h: Removed.
        * m4/Makefile.am: Adjust.
        (pkgincdir): Removed.  Use pkgincludedir instead.
        * m4/module.h, src/main.c: Don't include `m4/error.h'.
        * m4/system_.h (INCLUDE_ERROR_H): Add a substitution for suitable
        error.h.
        * gnulib/m4/progname.c: Imported from CVS gnulib.
        * gnulib/m4/progname.h: Ditto.
        * src/main.c: Adjust to use progname module.
        * gnulib/m4/error.c: Imported from CVS gnulib.
        * gnulib/m4/error_.h: Ditto.
        * gnulib/m4/Makefile.am: Build the error module into our libgnu.la
        if appropriate, and link a local error.h if the system version is
        missing.
        (libgnu_la_SOURCES) Add progname module sources.
        * gnulib/config/error.m4: Imported from CVS gnulib.
        * gnulib/config/strerror_r.m4: Ditto.
        * config/m4-error.c: New file.  Wrap gnulib error.m4 but arrange
        to have ERROR_H for Makefile substitutions and tell system.h
        whether the system error.h should be used, or a locally installed
        version.
        * configure.ac (jm_PREREQ_ERROR): Replaced by a call to m4_ERROR.

2003-09-09  Gary V. Vaughan  <gary@gnu.org>

        * gnulib/m4/Makefile.am (MOSTLYCLEANFILES): Typo
        s/gettext_.h/gettext.h/.

        * bootstrap: Revert 2003-09-04 patch now that CVS autoconf and
        automake have been fixed.

        * config/m4-obstack.m4 (m4_FUNC_OBSTACK): D'oh! Now that we wrap
        gl_OBSTACK, which in turn calls AC_FUNC_OBSTACK, don't rerun bits
        of code originally snarfed from AC_FUNC_OBSTACK!!! While I'm here
        rename to m4_OBSTACK in light of wrapping gl_OBSTACK.

2003-09-09  Gary V. Vaughan  <gary@gnu.org>

        The gnulib obstack module requires the gnulib gettext module for
        systems that do not have GNU gettext installed.  Because we use
        -Ignulib/m4 in our Makefiles it is not safe to drop gettext.h in
        that directory incase it clashes with the system gettext.h.  This
        delta uses gettext_.h and extra rules in the Makefile to make a
        link to gettext.h when needed:

        * Makefile.am (auxdir): Removed.  No longer used.
        * configure.ac (ac_aux_dir): Removed AC_SUBST.  No longer used.
        (TIMESTAMP): List path to `mkstamp' literally, as ac_aux_dir has
        moved.
        (AC_CONFIG_LIBOBJ_DIR): Declare this for possible future single
        Makefile based build.
        (AC_CONFIG_AUX_DIR): Now we use gnulib/config where the majority
        of the macros are kept.
        * Makefile.am (ACLOCAL_MFLAGS): Search gnulib/config first.
        * configure.ac (AM_INIT_AUTOMAKE): Require 1.7a.
        * config/Makefile (ACLOCAL_MACROS): Removed.  Automake 1.7a
        distributes these automatically.
        * config/regex.m4 (jm_WITH_REGEX): Fixed underquoting to prevent
        warning from automake-1.7a.
        * config/debug.m4 (M4_AC_CHECK_DEBUGGING): Renamed to
        m4_CHECK_DEBUGGING for consistency with gnulib prefixes.  Changed
        all callers.
        * config/m4-obstack.m4 (M4_AC_FUNC_OBSTACK): Ditto
        wrt. m4_FUNC_OBSTACK.
        * config/stackovf.m4 (M4_AC_SYS_STACKOVF): Ditto
        wrt. m4_sys_STACKOVF.
        * config/gmp.m4 (_M4_AC_LIB_GMP, M4_AC_LIB_GMP): Ditto
        wrt. _m4_LIB_GMP, m4_LIB_GMP.
        (ac_gmp_save_LIBS, ac_cv_using_lib_gmp): Don't use autoconf's
        namespace.  Renamed to m4_gmp_save_LIBS and m4_cv_using_lib_gmp
        respectively.
        * config/m4-gettext.m4: New file to set GETTEXT_H appropriately.
        * gnulib/m4/Makefile.am: Added a new block to make an appropriate
        gettext.h link on deficient systems.
        (pkginc_HEADERS): Mention $(GETTEXT_H).
        (EXTRA_HEADERS): Mention gettext.h.
        * gnulib/config/gettext_.h: New file from gnulib's gettext.h.
        * gnulib/config/codeset.m4, gnulib/config/gettext.m4,
        gnulib/config/glibc21.m4, gnulib/config/iconv.m4,
        gnulib/config/intdiv.m4, gnulib/config/inttypes-pri.m4,
        gnulib/config/inttypes.m4, gnulib/config/inttypes_h.m4,
        gnulib/config/isc-posix.m4, gnulib/config/lcmessage.m4,
        gnulib/config/lib-ld.m4, gnulib/config/lib-link.m4,
        gnulib/config/lib-prefix.m4, gnulib/config/nls.m4,
        gnulib/config/po.m4, gnulib/config/progtest.m4,
        gnulib/config/stdint_h.m4, gnulib/config/uintmax_t.m4,
        gnulib/config/ulonglong.m4: Imported from CVS gnulib.

2003-09-05  Gary V. Vaughan  <gary@gnu.org>

        We can't mirror the gnulib directory structure here, since we need
        to be able to eg. `#include <m4/obstack.h>' from our source files,
        which is much easier if the local obstack.h is created in a
        directory named m4.  Rather than trying to symlink everything into
        the m4 directory, now we build a libtool convenience library from
        the sources we get from gnulib and link that with libm4.la:

        * gnulib/config/extensions.m4: Imported from CVS gnulib.
        * gnulib/config/unlocked-io.m4: Ditto.
        * gnulib/m4/unlocked-io.h: Ditto.
        * gnulib/m4/obstack.m4, gnulib/m4/onceonly_2_57.m4,
        gnulib/m4/stdbool.m4: All moved to gnulib/config directory.
        * gnulib/lib/obstack.c, gnulib/lib/obstack_.h,
        gnulib/lib/stdbool_.h: All moved to gnulib/m4 directory.
        * m4/strtol.c, m4/xmalloc.c, m4/xstrdup.c, m4/xstrzdup.c: Ditto.
        * m4/Makefile.am: Adjust.
        * gnulib/Makefile.am (EXTRA_DIST): Name just the additional gnulib
        macros we redistribute.
        * gnulib/m4/Makefile.am: New file.  Build libgnu.la convenience
        library among others.
        (GNULIB_SRCS, GNULIB_MACROS): Removed.
        * Makefile.am (ACLOCAL_AMFLAGS): Adjust.
        * config/m4-obstack.m4: Adjust.
        * po/POTFILES.in: Adjust.
        * configure.ac: Reformatting.  Call newly imported gnulib macros.
        * m4/builtin.c, m4/macro.c, m4/module.c, m4/utility.c: Removed
        bogus calls of `#include "m4.h"'.
        * Makefile.am: INCLUDES has been deprecated in favour of
        AM_CPPFLAGS.
        * m4/Makefile.am: Ditto.
        * modules/Makefile.am: Ditto.
        * src/Makefile.am: Ditto.

2003-09-05  Gary V. Vaughan  <gary@gnu.org>

        * config/Makefile.am: Reverting yesterdays patch for VPATH builds.

2003-09-04  Gary V. Vaughan  <gary@gnu.org>

        Migrate the obstack support into the gnulib directories for easy
        synchronisation with upstream files in gnulib:

        * config/gnu-obstack.m4: Moved from here...
        * config/m4-obstack.m4: ...to here.
        * config/Makefile.am (SPECIFIC_MACROS): Adjust.
        * m4/obstack.c, m4/obstack_.h: Moved from here...
        * gnulib/obstack.c, gnulib/obstack.h: ...to here.
        * po/POTFILES.in: Adjust.
        * gnulib/Makefile.am (GNULIB_SRCS, GNULIB_MACROS): Adjust.
        * m4/Makefile.am: Add a whole new section to link the obstack
        sources from the gnulib tree if necessary.
        * gnulib/m4/onceonly_2_57.m4, gnulib/m4/obstack.m4: New macros
        from gnulib.
        * config/m4-obstack.m4: Rewrite as a wrapper for
        gnulib/m4/obstack.m4.

2003-09-04  Gary V. Vaughan  <gary@gnu.org>

        GNU M4 currently builds with a number of files adapted from
        upstream sources.  Recently the gnulib project on savannah.gnu.org
        has pulled together a great many of these externally maintained
        files.  This delta is the beginnings of isolating those files
        maintained in gnulib to make it easy to synchronise M4 with the
        upstream files prior to releases.

        * Makefile.am (ACLOCAL_AMFLAGS): Mention gnulib/m4 macro
        directory.
        (SUBDIRS): Added new gnulib subdirectory.
        * configure.ac (AC_CONFIG_FILES): Add new gnulib tree Makefiles.
        * config/stdbool.m4: Moved from here...
        * gnulib/m4/stdbool.m4: ...to here.
        * m4/stdbool_.h: Moved from here...
        * gnulib/lib/stdbool_.h: ...to here.
        * gnulib/Makefile.am: New file.  Make sure the gnulib tree is
        distributed.
        * m4/Makefile.am: Adjust gnulib/modules/stdbool:Makefile.am based
        code to work with new stdbool_.h location.
        (gnulib_srcdir): New.

2003-09-04  Gary V. Vaughan  <gary@gnu.org>

        * config/Makefile.am (MAINTAINERCLEANFILES, ACLOCAL_MACROS)
        (STANDARD_TOOLS, SPECIFIC_MACROS): Needed `$(srcdir)/' for VPATH
        builds to work.
        (SPECIFIC_TOOLS): New variable.  Moved mkstamp to here.
        (EXTRA_DIST): Use it.

        * bootstrap: CVS autoreconf leaves file droppings.  Remove
        aclocal.m4t incase autoreconf doesn't.

2003-08-29  Gary V. Vaughan  <gary@gnu.org>

        * m4/gnu-obstack.h: Updated from CVS gnulib.  For consistency with
        the other gnulib imports, renamed to m4/obstack_.h.
        * m4/obstack.c: Updated from CVS gnulib.
        * m4/Makefile.am (EXTRA_HEADERS): Adjust.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Merge in additional
        header tests from gnulib obstack module.  AC_CONFIG_LINKS knows
        about vpath already, and $top_srcdir upsets CVS Automake, so the
        $top_srcdir reference was removed.

        * m4/system-h.in: For consistency with the gnulib imports, renamed
        to m4/system_.h.
        * m4/Makefile (EXTRA_HEADERS): Adjust.
        * configure.ac (AC_CONFIG_FILES): Adjust.

        * m4/stdbool_.h: New file from gnulib for systems without their
        own.
        * m4/Makefile.am: Add snippets from gnulib for C99 bool support.
        * config/stdbool.m4: New file.  Macros from gnulib for same.
        * configure.ac: Use it.

2003-08-27  Gary V. Vaughan  <gary@gnu.org>

        * config/debug.m4: `perl -pi.bak -e 's/(Copyright) (\d)/$1 (C) $2/g'`
        * config/gmp.m4: Ditto.
        * config/gnu-obstack.m4: Ditto.
        * config/stackovf.m4: Ditto.
        * m4/builtin.c: Ditto.
        * m4/debug.c: Ditto.
        * m4/error.c: Ditto.
        * m4/error.h: Ditto.
        * m4/gnu-obstack.h: Ditto.
        * m4/hash.c: Ditto.
        * m4/hash.h: Ditto.
        * m4/input.c: Ditto.
        * m4/m4.c: Ditto.
        * m4/m4module.h: Ditto.
        * m4/m4private.h: Ditto.
        * m4/macro.c: Ditto.
        * m4/module.c: Ditto.
        * m4/obstack.c: Ditto.
        * m4/output.c: Ditto.
        * m4/path.c: Ditto.
        * m4/regex.c: Ditto.
        * m4/regex.h: Ditto.
        * m4/strtol.c: Ditto.
        * m4/symtab.c: Ditto.
        * m4/syntax.c: Ditto.
        * m4/utility.c: Ditto.
        * m4/xmalloc.c: Ditto.
        * m4/xstrdup.c: Ditto.
        * m4/xstrzdup.c: Ditto.
        * modules/evalparse.c: Ditto.
        * modules/format.c: Ditto.
        * modules/gnu.c: Ditto.
        * modules/import.c: Ditto.
        * modules/load.c: Ditto.
        * modules/m4.c: Ditto.
        * modules/m4.h: Ditto.
        * modules/modtest.c: Ditto.
        * modules/mpeval.c: Ditto.
        * modules/perl.c: Ditto.
        * modules/shadow.c: Ditto.
        * modules/stdlib.c: Ditto.
        * modules/time.c: Ditto.
        * modules/traditional.c: Ditto.
        * src/freeze.c: Ditto.
        * src/getopt.c: Ditto.
        * src/getopt1.c: Ditto.
        * src/m4.h: Ditto.
        * src/main.c: Ditto.
        * src/stackovf.c: Ditto.

        * config/gmp.m4 (M4_AC_LIB_GMP): Use AC_INCLUDES_DEFAULT:
        ac_default_headers is an autoconf internal variable.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Ditto.
        * config/stackovf.m4 (M4_AC_SYS_STACKOVF): Ditto.

        * configure.ac (AC_CONFIG_FILES): Add tests/atlocal.
        * tests/Makefile.am (TESTS_ENVIRONMENT): Revert the 2003-08-14
        delta.

2003-08-15  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac (AC_HEADER_STDBOOL, INCLUDE_STDBOOL_H): Check for
        C99 bool.
        * system-h.in (m4_boolean): Removed in favour of using C99 bool if
        possible or faking one with a typedef.  Changed all callers.

2003-08-15  Gary V. Vaughan  <gary@gnu.org>

        Still cleaning up the users' module API, by taking out the stuff
        that isn't used by any existing modules, and moving specialised
        functions out of libm4 and into the module they are used by.

        * m4/m4module.h (m4_skip_space): No need to export this.  Moved...
        * m4/utility.c (m4_skip_space): ...to here the home of its only
        use, made static and renamed to `skip_space'.  Changed all
        callers.
        * m4/m4module.h (m4_expand_ranges): Removed prototype.
        * m4/utility.c (m4_expand_ranges): Moved definition from here...
        * modules/m4.c (m4_expand_ranges): ...to here, and exported using
        ltdl.
        * modules/m4.h (m4_expand_ranges_func): For lt_dlsym import
        casting .
        * modules/gnu.c (builtin_syntax): Import and use in this
        builtin implementation.
        * m4/m4module.h (M4_DEBUG_PRINT1, M4_DEBUG_PRINT2, M4_DEBUG_PRINT3):
        Not used.  Deleted.
        * m4/macro.c (trace_flush): Except here where the macro is now
        manually inlined.
        * m4/m4module.h (M4_DEBUG_MESSAGE, M4_DEBUG_MESSAGE1)
        (M4_DEBUG_MESSAGE2, M4_DEBUG_MESSAGE3): Only used internally, so
        moved...
        * m4/m4private.h (M4_DEBUG_MESSAGE, M4_DEBUG_MESSAGE1)
        (M4_DEBUG_MESSAGE2, M4_DEBUG_MESSAGE3): ...to here.

2003-08-14  Gary V. Vaughan  <gary@gnu.org>

        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Use the interrim new
        compiler based AC_CHECK_HEADER that was introduced in
        autoconf-2.56.
        * config/stackovf.m4 (M4_AC_SYS_STACKOVF): Ditto.
        * config/gmp.m4 (AC_LIB_GMP): Ditto. And renamed to M4_AC_LIB_GMP.
        * configure.ac: Use renamed M4_AC_LIB_GMP.

        * config/debug.m4 (M4_AC_CHECK_DEBUGGING): Don't AC_REQUIRE a
        macro that requires arguments! This stops the shell's bad
        substitution error at configure time.

        * tests/Makefile.am (TESTS_ENVIRONMENT): Now we can pass make
        variables to the testsuite shell.  Set the value of USE_GMP so
        that the gmp test will run!
        (check-local, clean-local): Use the TESTS_ENVIRONMENT variable.

2003-08-11  Gary V. Vaughan  <gary@gnu.org>

        Libltdl already has an excellent mechanism for accessing C symbols
        in modules.  Lets use that!  Remove all the exporting cruft and
        just use lt_dlsym in conjunction with a few conventions to
        simplify module writers' jobs.  Also removed the table address
        caching code and otherwise simplified the module loader quite a
        bit.  To access exported symbols in other modules, first the
        exporting module must name the symbols <modname>_LTX_<symname>,
        and the importing module must define a function type called
        <symname>_func.  The importer then adds
        M4_MODULE_IMPORT(<modname>, <symname>) at the top of any function
        that wishes to call out to the exported functions.  Care must be
        taken that <symname> is non-NULL in the importing module incase
        M4_MODULE_IMPORT fails, but otherwise it can be called as if the
        definition was in the importers source.  Study
        `modules/{gnu.c,m4.{c,h}' for a model example.  At the moment,
        m4_module_import will attempt to automatically load a module
        required for symbol access if it is not loaded already.

        * TODO: Removed the items fixed in this delta.
        * m4/ltdl.c (lt_dlhandle_find): New function to find a handle by
        module name.
        * m4/ltdl.h (lt_dlhandle_find): Declare it.
        * m4/module.c (m4_module_unload): Use it.
        * src/freeze.c (reload_frozen_state): Ditto.
        * m4/m4module.h (m4_export): Deleted.  Removed all references.
        (M4_MODULE_IMPORT): New user convenience macro for importing
        arbitrary symbols from other modules.
        * m4/module.c (m4_module_import): New function to service
        M4_MODULE_IMPORT macro.
        (module_data): Removed.  Looking up the tables on demand with
        lt_dlsym, rather than caching their addresses here simplifies the
        code substantially.
        (m4_get_module_builtin_table, m4_get_module_macro_table):
        Removed.  Changed all callers.
        (set_module_macro_table, set_module_builtin_table): Renamed to
        install_macro_table and install_builtin_table respectively, and
        simplified now that the cache is no more.
        * modules/gnu.c (builtin_symbols): Use this new mechanism to
        import m4_dump_symbols from the m4 module.
        (builtin_esyscmd): Likewise for m4_set_sysval and
        m4_sysval_flush.
        * modules/m4.c (m4_export_table): Removed.  Functions are
        addressed with the new mechanism which doesn't need this.
        (m4_set_sysval): New exported accessor function to prevent
        problems with variable access on inferior architectures.
        * modules/m4.h (m4_sysval_flush_func, m4_set_sysval_func)
        (m4_dump_symbols_func): Typedefs required by M4_MODULE_IMPORT so
        that we can have some type safety.
        * modules/modtest.c (export_test): C level exported function for
        testing the new import mechanism.
        * modules/import.c: New file for the import end of the test.
        * modules/Makefile.am (pkglibexec_LTLIBRARIES): Added import.la.
        * tests/modules.at: New test cases for intermodule symbol
        importing.

2003-08-07  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4module.c (m4_string): Moved from here...
        * m4/m4private.c (m4_string): ...to here.

        * m4/utility.c (dumpdef_cmp): Removed stale declaration.

2003-07-29  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4module.h (M4_DEFAULT_NESTING_LIMIT): This value is
        already available to module writers through
        m4_{get,set}_nesting_limit_opt(), so moved from here...
        * m4/m4.c (DEFAULT_NESTING_LIMIT): ...to here and renamed.
        (m4_create): Use it.

2003-07-28  Gary V. Vaughan  <gary@gnu.org>

        Aside from auditing path.c for m4module.h api obfuscation, this
        delta introduces the concept of private struct members in opaque
        data types to GNU m4: See the STYLE file for details.

        * TODO: Remind ourselves that a rewrite of path.c is needed.
        * m4/m4module.h (m4_search_path, struct m4_search_path_info):
        Moved from here...
        * m4/m4private.h (m4__search_path, m4__search_path_info): ...to
        here and renamed.  These type definitions are for internal api use
        only.  Changed all callers.
        * m4/m4module.h (m4_search_path_env_init, m4_search_path_add):
        Moved from here...
        * m4/path.c (search_path_env_init, search_path_add): ...to here
        and renamed.  These calls were never used outside this file.
        Changed all callers.
        (dirpath): Moved functionality of this static declaration...
        * m4/m4private.h (struct m4): ...to this new internal only
        search_path field.  Changed all callers.
        (m4__get_search_path): Added new internal api accessor.
        * m4/path.c (m4_search_path_info_new):  Removed.  Not used.
        (m4_include_init): Removed...
        * m4/m4.c (m4_create): ...because the new m4 field is now
        initialised here.
        (m4_delete): Recycle search_path memory.
        * src/main.c (main): Don't call m4_include_init now that it's
        gone!
        * doc/STYLE: Document convention for private fields in opaque
        ADTs.

2003-07-24  Gary V. Vaughan  <gary@gnu.org>

        Sometimes exporting the address of a symbol from a module isn't
        enough for other modules to call that symbol correctly.  If
        custom data types are used for function parameters, they need to
        be known to the caller.  This change introduces the concept of
        $(prefix)/include/modules/$(modulename).h to declare those
        structures.  Also we move m4_dump_symbols from libm4 to the m4
        module to show this concept in action.

        * m4/m4module.h (m4_dump_symbol_data): Moved from here...
        * modules/m4.h (m4_dump_symbol_data): ...to this new file for
        exporting data structures from modules/m4.c.
        * modules/m4.c, modules/gnu.c: Include it.
        * modules/Makefile.am (pkgmodinc_HEADERS): Install it.
        * m4/m4module.h (m4_dump_symbol_CB, m4_dump_symbols): Removed
        prototypes.
        * m4/utility.c (dumpdef_cmp, m4_dump_symbol_CB, m4_dump_symbols):
        Moved from here...
        * modules/m4.c (dumpdef_cmp_CB, dump_symbol_CB, m4_dump_symbols):
        ...to here, with slight renaming.
        (m4_export_table): Prototype and add m4_dump_symbols.
        * m4/symtab.c (m4_is_symbol_value_void): Needed for an external
        definition of m4_dump_symbols.
        * m4/m4module.h (m4_is_symbol_value_void): Prototype it.
        * m4/m4private.h (m4_is_symbol_value_void): Fast macro version.

2003-07-24  Gary V. Vaughan  <gary@gnu.org>

        Create an export table in modules/m4.c in readiness for beefing up
        the module loader to track module exports and imports.

        * m4/m4module.h (m4_debug_flush_files): Removed prototype.
        * m4/debug.c (m4_debug_flush_files): Moved...
        * modules/m4.c (m4_sysval_flush): ...to here and renamed.
        * modules/gnu.c (builtin_esysval): Use it.
        * m4/m4module.h (m4_export): New type for declaring module symbols
        for export.
        * modules/m4.c (m4_export_table): List symbols exported from this
        module for use by other modules.

2003-07-24  Gary V. Vaughan  <gary@gnu.org>

        An experiment: There is loads of code in libm4 which should be in
        the m4 module, but is also used by another module. Just because
        some linkers won't cope with calls across dynamic runtime loaded
        objects I initially left the code in libm4.  It will tidy the
        module api immensely if this code moves to the right place, I just
        need to remember to invent a suitable calling mechanism at some
        point.  For now, only modules that are statically linked and
        preloaded will get this treatment, so the only platforms that will
        break are those that require all symbols to be resolved at link
        time.

        * TODO: Reminder that what I am doing could reduce portability
        unless I do something more robust later.
        * m4/m4module.h (m4_sysval): No longer exported from libm4.
        * m4/utility.c (m4_sysval): No longer declared in libm4.
        * modules/Makefile.am: Reformatting.
        * modules/m4.c (m4_sysval): Declare it at place of use.
        * modules/gnu.c (m4_sysval): Import it for use in esyscmd.

2003-07-23  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4module.h: Reformatting and rearranging lines a bit.
        (m4_obstack): Save typing by typedefing `struct obstack'.  Changed
        all users.
        (m4_call_macro, m4_expand_input): Renamed...
        (m4_macro_call, m4_macro_expand_input): ...to these.  Changed all
        callers.
        (m4_expansion_level, m4_process_macro): Moved...
        * m4/macro.c (expansion_level, process_macro): ...to here, and
        made static.

        * m4/m4module.h (program_name): Not used by modules at all, so
        moved...
        * src/main.c (program_name): ...to here.
        (print_program_name): Renamed...
        (print_program_name_CB): ...to conform to the STYLE guide.

2003-07-23  Gary V. Vaughan  <gary@gnu.org>

        More refactoring of the m4module.h API.  Replace #defines with an
        enum, and move non-public functions out of the public API.

        * m4/debug.c (stdarg.h, varargs.h): Remove variadic header
        inclusion.
        * m4/macro.c (stdarg.h): Add ANSI C variadic header.
        * m4/debug.c (m4_debug, trace): Moved...
        * m4/m4private.h (struct m4): ...to fields of this struct.
        (m4_get_debug_file, m4_get_trace_messages): New fast access macros
        for the new fields.
        * m4/debug.c (m4_debug_init, m4_debug_exit): Removed functions...
        * src/main.c (m4_debug_init, m4_debug_exit): ...invocations...
        * m4/m4.c (m4_create, m4_delete): ...and handled here instead.
        * m4/m4module.h (m4_context_field_table): Add entries for new
        debug_file and trace_messages fields.
        (M4_DEBUG_TRACE_ARGS, M4_DEBUG_TRACE_EXPANSION)
        (M4_DEBUG_TRACE_QUOTE, M4_DEBUG_TRACE_ALL, M4_DEBUG_TRACE_LINE)
        (M4_DEBUG_TRACE_FILE, M4_DEBUG_TRACE_PATH, M4_DEBUG_TRACE_CALL)
        (M4_DEBUG_TRACE_INPUT, M4_DEBUG_TRACE_CALLID)
        (M4_DEBUG_TRACE_VERBOSE): Replaced #defines with an enum.
        (m4_is_debug_bit): New macro to simplfy checks against the debug
        bits above.
        (m4_trace_format, m4_trace_header, m4_trace_flush)
        (m4_trace_prepre, m4_trace_pre, m4_trace_post): Removed
        prototypes.
        * m4/debug.c (m4_trace_format, m4_trace_header, m4_trace_flush)
        (m4_trace_prepre, m4_trace_pre, m4_trace_post): Moved...
        * m4/macro.c (trace_format, trace_header, trace_flush)
        (trace_prepre, trace_pre, trace_post): ...to these newly static
        functions, since they are only ever used from this file.  Changed
        all callers.

2003-07-17  Gary V. Vaughan  <gary@gnu.org>

        Change the macros for checking syntax so that matching against
        multiple possible syntax classes can be done with a single
        comparison some of the time.  The various classes are now bits of
        an int that can be checked with bitwise logic operators.

        * m4/m4module.h (M4_SYNTAX_IGNORE, M4_SYNTAX_OTHER)
        (M4_SYNTAX_SPACE, M4_SYNTAX_OPEN, M4_SYNTAX_CLOSE, M4_SYNTAX_COMMA)
        (M4_SYNTAX_DOLLAR, M4_SYNTAX_ACTIVE, M4_SYNTAX_ESCAPE)
        (M4_SYNTAX_ASSIGN, M4_SYNTAX_ALPHA, M4_SYNTAX_NUM)
        (M4_SYNTAX_LQUOTE, M4_SYNTAX_RQUOTE, M4_SYNTAX_BCOMM)
        (M4_SYNTAX_ECOMM): Replaced #defines with an enum.
        (M4_SYNTAX_ALNUM): Removed.  Changed all callers.
        (M4_IS_IGNORE, M4_IS_OTHER, M4_IS_SPACE, M4_IS_OPEN, M4_IS_CLOSE)
        (M4_IS_COMMA, M4_IS_DOLLAR, M4_IS_ACTIVE, M4_IS_ESCAPE)
        (M4_IS_ASSIGN, M4_IS_ALPHA, M4_IS_NUM, M4_IS_LQUOTE, M4_IS_RQUOTE)
        (M4_IS_BCOMM, M4_IS_ECOMM, M4__IS_STRING, M4_IS_IDENT): Removed.
        Replace all calls with invocations of these...
        (m4_is_syntax, m4_has_syntax): ...New macros.
        * src/freeze.c (produce_syntax_dump): Remove mask argument, which
        is no longer required with new macros.  Changed all callers.

2003-07-15  Gary V. Vaughan  <gary@gnu.org>

        * m4/input.c (CHAR_EOF, CHAR_BUILTIN, CHAR_RETRY): These token
        values are returned as part of the internal interface, so they
        need to be moved...
        * m4/private.h: ...to here.
        * m4/macro.c (expand_token): Check for out of range
        m4_peek_input() results before looking up in the syntax table.
        (collect_arguments): Ditto.

        * NEWS: Note `$' syntax class.

2003-07-08  Paul Eggert  <eggert@twinsun.com> and
            Gary V. Vaughan  <gary@gnu.org>

        Conform to POSIX if the POSIXLY_CORRECT environment is set.
        --traditional `define' now smashes all the definitions.

        * NEWS: Explain this.
        * doc/m4.texinfo (Defn): `defn' takes any number of arguments.
        (Extensions): Explain that extensions that are incompatible with
        POSIX are disabled if POSIXLY_CORRECT is set.
        (Incompatibilities): Remove.
        (Define, Other Incompat): Explain difference
        between GNU and POSIX behavior of define, pushdef, popdef.
        * m4/m4.c (m4_get_posixly_correct_opt): New undef.
        * m4/m4module.h (m4_context_opt_bit_table): Add POSIXLY_CORRECT entry.
        * m4/m4private.h (M4_OPT_POSIXLY_CORRECT_BIT): New macro.
        (m4_get_posixly_correct_opt): New macro.
        * m4/m4macro.c (m4_process_macro): Disable $10, $abc etc. if
        POSIXLY_CORRECT.
        * modules/m4.c (builtin_functions): defn now takes any number of args.
        (builtin_define): Smash all the definitions if
        POSIXLY_CORRECT.
        (builtin_defn)): Allow any number of arguments.
        (builtin_undivert): Do not allow nonnumeric arguments
        if POSIXLY_CORRECT.
        * src/main.c (main): Set posixly-correct behavior if either
        POSIXLY_CORRECT is set, or if -G is given.
        * tests/builtins.at: New test for smashed definitions.

2003-06-27  Gary V. Vaughan  <gary@gnu.org>

        * doc/m4.texinfo (Changesyntax): Document Dollar syntax class.
        * m4/m4module.h (M4__SYNTAX_STRING): New syntax class. Be careful
        not to slow the parser down.
        (M4__IS_STRING): New macro to test string syntax class membership.
        * m4/syntax.c: Adjust docucomment.
        (m4_syntax_create): Add a default M4_SYNTAX_DOLLAR element.
        (m4_syntax_code): Translate `$' -> M4_SYNTAX_DOLLAR.
        * m4/input.c (init_builtin_token): Comment typo.
        (m4__next_token): Comment typo.
        Accept M4_SYNTAX_DOLLAR items into M4_TOKEN_STRING type tokens
        by using the new M4__IS_STRING macro.
        * m4/macro.c (m4_process_macro): Use M4_IS_DOLLAR to test for
        variable references in macro expansions.

        * doc/m4.texinfo (Eregexp and Regexp): Typo.
        (Epatsubst and Patsubst): Typo.
        (Eval): Typo.

2003-06-26  Gary V. Vaughan  <gary@gnu.org>

        Move the global variables that pertain to syntax to a new `struct
        m4_syntax_table', and then add one of these to `struct m4'.  The
        ripple effect through the code to both change formerly global
        references, and make sure a suitable context is available in
        lexical scope is disproportionately large compared to the size of
        the change proper.  This change is a large part of decoupling
        syntax.c from the rest of the code that uses it.

        * m4/m4private.h (struct m4): Add a syntax field.
        * m4/m4.c (m4_create): Initialise it,
        (m4_delete): Recycle it.
        (m4_get_symtab): Remove hand coded version...
        (m4_get_symbol_table): ...and generate this with cpp.  Changed all
        callers.
        * m4/m4module.h (m4_context_field_table): Add an extra field so we
        can generate m4_get_symbol_table.  Add a new row for
        m4_get_syntax_table.
        (M4SYNTAX): Syntactic sugar for module writers.
        (m4_symtab): Renamed to m4_symbol_table.  Changed all callers.
        (m4_syntax_table): New home for syntax related formerly global
        variables.
        * m4/m4private.h (struct m4_syntax_table): Define it.
        * m4/input.c (m4_input_init): Initialisation of these formerly
        global variables moved...
        * m4/syntax.c (m4_syntax_create): ...to here.
        * m4/input.c (m4_input_exit): And similarly, recycling of the
        memory used by those values moved...
        * m4/syntax.c (m4_syntax_delete): ...to here.
        * m4/m4module.h (DEF_LQUOTE, DEF_RQUOTE, DEF_BCOMM, DEF_ECOMM):
        Moved to m4/m4private.h.
        * m4/syntax.c (m4_get_syntax_lquote, m4_get_syntax_rquote)
        (m4_get_syntax_bcomm, m4_get_syntax_ecomm)
        (m4_is_syntax_single_quotes, m4_is_syntax_single_comments)
        (m4_is_syntax_macro_escaped): New accessors for m4_syntax_table
        objects.  Changed all callers that used to directly access the
        global equivalents.
        (m4__single_quotes, m4__single_comments, m4__use_macro_escape):
        Removed and incorporated into m4_syntax_table structure.
        * m4/utility.c (lquote, rquote, bcomm, ecomm): Ditto.
        * m4/syntax.c (m4_set_syntax): Now returns an error status,
        instead of requiring a `struct m4' to generate its own errors.
        Changed all callers.
        * src/main.c (main): Now that the syntax table is initialised as
        part of m4_create, we have to manually wipe the syntax entries if
        we are about to read a frozen file.

2003-06-26  Gary V. Vaughan  <gary@gnu.org>

        * doc/STYLE: Added notes on callback naming schemes.

        * m4/module.c (m4_set_module_macro_table)
        (m4_set_module_builtin_table): Declarations weren't changed when
        definitions were renamed on 2003-06-19.

        * m4/hash.c (m4_hash_resize): ifdefed out.  This function is
        neither used nor particularly appropriate since it exposes the
        internal workings of the hash module.  I haven't yet decided
        whether to remove it entirely.

2003-06-20  Gary V. Vaughan  <gary@gnu.org>

        Two related changes, and a huge knockon effect throughout the
        source: Moved the option variables out of global space and into
        `struct m4'; made `m4_symtab' a real datatype, so that its api
        is not marred passing `struct m4' around just so it can decide
        whether to keep traced symbol names or not.  Added setters and
        getters for the formerly global option variables, and obviously
        changed a vast number of functions to take a `struct m4' and use
        the getter funcs to find option values.

        * m4/utility.c (interactive, sync_output, debug_level)
        (no_gnu_extensions, prefix_all_builtins, suppress_warnings)
        (max_debug_argument_length, warning_status, nesting_limit)
        (discard_comments): Removed.
        * m4/m4module (warning_status, no_gnu_extensions, nesting_limit)
        (debug_level, max_debug_argument_length, prefix_all_builtins)
        (suppress_warnings, discard_comments, interactive, sync_output):
        Removed from here...
        * m4/m4private.h (struct m4): ...and equivalent fields added to
        this structure.
        (m4_get_warning_status_opt, m4_get_no_gnu_extensions_opt)
        (m4_get_nesting_limit_opt, m4_get_debug_level_opt)
        (m4_get_max_debug_arg_length_opt, m4_get_prefix_builtins_opt)
        (m4_get_suppress_warnings_opt, m4_get_discard_comments_opt)
        (m4_get_interactive_opt, m4_get_sync_output_opt): Fast access
        macros for the new fields.
        * m4/m4module.h (m4_context_field_table)
        (m4_context_opt_bit_table): Helper macros used to generate
        prototypes, setters and getters for new option fields
        consistently.
        * m4/m4.c (m4_get_warning_status_opt, m4_get_no_gnu_extensions_opt)
        (m4_get_nesting_limit_opt, m4_get_debug_level_opt)
        (m4_get_max_debug_arg_length_opt, m4_get_prefix_builtins_opt)
        (m4_get_suppress_warnings_opt, m4_get_discard_comments_opt)
        (m4_get_interactive_opt, m4_get_sync_output_opt)
        (m4_set_warning_status_opt, m4_set_no_gnu_extensions_opt)
        (m4_set_nesting_limit_opt, m4_set_debug_level_opt)
        (m4_set_max_debug_arg_length_opt, m4_set_prefix_builtins_opt)
        (m4_set_suppress_warnings_opt, m4_set_discard_comments_opt)
        (m4_set_interactive_opt, m4_set_sync_output_opt): Addressable
        setter and getter functions generated by cpp from
        m4_context_field_table and m4_context_opt_bit_table, exported as
        part of the module api.  Changed all callers.
        * m4/symtab (struct m4_symtab): Used as the concrete type for
        m4_symtab now.
        (m4_symtab_create): Allocate and initialise a new struct.
        (m4_symtab_apply): New function that works like m4_hash_apply, but
        with different callbacks specific to symbol tables.  Changed all
        callers.
        (symbol_destroy, arg_destroy, arg_copy): Renamed
        symbol_destroy_CB, arg_destroy_CB, arg_copy_CB to remind me that
        they have unused parameters for a reason!
        (dump_symbol_CB): New callback to dump the contents of a single
        symbol.
        (symtob_dump): Rewritten in terms of dump_symbol_CB.
        * m4/utility.c (m4_dump_symbol): Renamed to m4_dump_symbol_CB.
        Changed all callers.
        * m4/m4.c (m4_create): By default point the `nuke_trace_bit' field
        of the contained `m4_symtab' at the `no_gnu_extensions' field.
        Although I'm not convinced these semantics are correct, they are
        at least consistent with how things were before this delta.  Also
        set the default nesting limit to M4_DEFAULT_NESTING_LIMIT.

2003-06-19  Gary V. Vaughan  <gary@gnu.org>

        Tie down the interface to libm4 some more.  Make more structures
        opaque to modules by moving them to m4private.h, and writing
        setters and getters.  To win back the speed penalty for doing this
        also wrote macroized versions that do know about structure layout
        in m4private.h and #include that file into modules when NDEBUG is
        defined at compile time.  There are still some accessor macros in
        m4private.h that need to go, but that is not necessary to clean
        the module api up.

        * m4/m4module.h (m4_symbol_type): Moved...
        * m4/m4private.h (m4__symbol_type): ...to here.
        * m4/symtab.c (m4_get_symbol_value, m4_get_symbol_traced)
        (m4_set_symbol_traced, m4_set_symbol_name_traced)
        (m4_is_symbol_text, m4_is_symbol_func, m4_get_symbol_text)
        (m4_get_symbol_func, m4_symbol_value_create)
        (m4_symbol_value_delete, m4_set_symbol_value_text)
        (m4_set_symbol_value_func): New exported api to symbols.
        (m4_get_symbol_value_type): Replaced by m4_is_symbol_value_text
        and m4_is_symbol_value_func.
        * m4/m4module.h: Prototype these guys.
        * m4/module.c (m4_set_module_macro_table)
        (m4_set_module_builtin_table): Make these static, there is no
        reason to pollute the api with them.
        * m4/m4private.h: Reformatting.
        (m4_get_symtab): Only define when NDEBUG is defined.
        (m4_get_symbol_value, m4_get_symbol_traced)
        (m4_set_symbol_traced, m4_set_symbol_name_traced)
        (m4_is_symbol_text, m4_is_symbol_func, m4_get_symbol_text)
        (m4_get_symbol_func, m4_symbol_value_create)
        (m4_symbol_value_delete, m4_set_symbol_value_text)
        (m4_set_symbol_value_func): Macro implementations of the new
        functions when NDEBUG is defined.
        (SYMBOL_TRACED, SYMBOL_VALUE, SYMBOL_TYPE, SYMBOL_TEXT)
        (SYMBOL_FUNC, VALUE_TYPE, VALUE_TEXT, VALUE_FUNC): Removed.
        Superceded by the above.  All callers changed.
        (M4ARG): Removed.  This is no longer different to the
        m4/m4module.h definition.
        * modules/gnu.c, modules/m4.c: Only include m4private.h when
        NDEBUG is defined.  That way we exercise the same (albeit slower)
        api that external modules must use.

2003-06-18  Gary V. Vaughan  <gary@gnu.org>

        Renamed some of the types and their accessors to make more sense.
        Now we have a SYMTAB in which we store SYMBOLs, and each SYMBOL
        has a stack of SYMBOL_VALUEs.

        * m4/m4module.h (m4_token, m4_get_token_type, m4_get_token_text)
        (m4_get_token_func, m4_token_copy): Renamed to m4_symbol_value,
        m4_get_symbol_value_type,  m4_get_symbol_value_text,
        m4_get_symbol_value_func and m4_symbol_value_copy respectively.
        Changed all callers.
        (m4_symbol_type): s/M4_TOKEN_/M4_SYMBOL_/
        (m4_get_token_type): Renamed
        * m4/input.c (m4_next_token): Renamed to m4__next_token, and moved
        to the internal api.
        * m4/m4private.h: s/TOKEN_ARG_/SYMBOL_ARG_/
        s/TOKEN_/VALUE_/
        (m4__symtab_init, m4__symtab_exit): Removed prototypes.
        (m4_token_arg): Renamed to m4_symbol_arg. Changed all callers.
        (m4__token_type): Moved here from m4module.h.
        (m4__next_token): Renamed from m4_next_token.
        * m4/symtab.c: Removed some of the parameterised macro support
        functions for modularisation later.
        (m4_token_copy): Renamed to m4_symbol_value_copy, and use new
        m4_hash_dup to perform a true deep copy of the SRC.
        (arg_copy): Callback for m4_symbol_value_copy.
        * utility.c (m4_token_get_type, m4_token_text, m4_token_func):
        Renamed to m4_get_symbol_value_type, m4_get_symbol_value_text and
        m4_get_symbol_value_func.  Changed all callers.

2003-06-18  Gary V. Vaughan  <gary@gnu.org>

        Tidy up style of hash.[ch] in accordance with doc/STYLE.

        * m4/hash.c: Internal symbol renaming and formatting.
        (m4_hash_dup): New function to facilitate deep copies of hash
        tables.
        (m4_hash_apply_func): Returns a void* now, which is a richer type
        for returning exceptions (NULL means keep going).
        (m4_hash_apply): Ditto.
        * m4/hash.h: Declare exported symbols with an explicit extern.
        Reformated.

2003-06-17  Gary V. Vaughan  <gary@gnu.org>

        Still refactoring furiously.  This delta represents a change in
        semantics to symtab.c.  Instead of building temporary m4_tokens
        in the caller, and copying fields in the methods, we now create
        the actual m4_token for hashing in the caller so the methods just
        slot them in directly.  Also, this means that we don't lookup a
        symbol and get back an allocated but VOID token to copy fields
        into, we create the token we want to push and pass that to
        m4_symbol_define or m4_symbol_pushdef.  And that's it.  There are
        a few other small changes to stop knowledge of the implementation
        of symtab.c leaking out into other files.

        * m4/macro.c (expand_argument): Comment typo corrected.
        * m4/symtab.c (symtab_fetch): New function to fetch the address of
        an interned symbol.
        (m4_symbol_pushdef): Take an extra value parameter and use this
        directly as the new top of the value stack.  All callers changed
        to build a token and pass responsibility for memory in, rather
        than copying as we used to.
        (m4_symbol_define): Also use the new value parameter directly as a
        replacement for the top of the value stack.  All callers changed
        to build a token as above.
        (m4_set_symbol_traced): New function to set the traced bit on the
        named symbol, creating it if necessary.
        (symbol_popval): The guts of the old m4_symbol_popdef.
        (m4_symbol_popdef): Use it.
        * m4/builtin.c (m4_symbol_set_token): Removed,
        (m4__symbol_set_builtin, m4__symbol_set_macro): Removed and
        replaced...
        * m4/module.c (m4_set_module_builtin_table)
        (m4_set_module_macro_table): ...with these more orthogonal
        functions.
        * m4/m4module.h (m4_macro_pushdef, m4_macro_define)
        (m4_builtin_pushdef, m4_builtin_define): Removed.  No longer
        required.
        * m4/builtin.c (M4_ARG_SIGNATURE_DEFAULT_SIZE)
        (m4_arg_signature_parse): Moved...
        * m4/symtab.c: ...to here.
        * m4/input.c (m4_token_copy): Arghh... I'm amazed this didn't
        screw something up. Moved...
        * m4/symtab.c (m4_token_copy): ...to here, and fixed so that it
        actually does a proper deep copy of source to dest.

2003-06-16  Gary V. Vaughan  <gary@gnu.org>

        Further refactoring to stabilise the module API.  Renaming some
        functions for orthogonality, and judicious definition migration to
        move things out of the set of exported symbols.

        * doc/STYLE: New file.  Notes on coding style.
        * m4/m4module.c: Updated bitrotted docucomment at the top of the
        file.
        (m4_module_name, m4_module_builtins, m4_module_macros): Renamed to
        m4_get_module_name, m4_get_module_builtin_table,
        m4_get_module_macro_table which are verb phrases.  Changed all
        callers.
        * m4/builtin.c (m4_builtin_table_install, m4_macro_table_install):
        Moved to...
        * m4/module.c (m4_set_module_builtin_table)
        (m4_set_module_macro_table): ...here, and renamed. Changed all
        callers.
        * m4/m4module.c (m4_module_data): This...
        * m4/m4private.c (struct m4_module_data): ...and this...
        * m4/module.c (module_data) ...consolidated here and no longer
        exported.  Changed all callers.

2003-06-16  Gary V. Vaughan  <gary@gnu.org>

        Begin work on lifting the curse of the global variables.  To start
        with create a `struct m4' context container, and replace
        `m4__symtab' with `context->symtab' throughout.  This means
        initialising a context container in main, and adjusting many
        functions between main and the module entry points so that the
        container gets passed through.  It would have been nice to
        defer this until after 1.5, but it has a major effect on the
        user's module writing ABI, so it needs to be addressed now - at
        least in the areas that impact the ABI.  An interrelated change
        in the symtab API removes the dependency on a global symbol table,
        and instead focuses on a passed table (from the context
        container).

        * TODO: Reminders for finishing context functionality.
        * m4/Makefile.am (libm4_la_SOURCES): Add m4.c.
        * m4/m4.c: New file. Manage new struct m4 objects to eliminate
        global variables and eventually allow m4 to be reentrant.
        * m4/m4private.h (m4): Define the new structure here...
        (M4_SYMTAB, m4_get_symtab): ...so we can have fast accessors that
        don't carry the overhead of a function call.
        * m4/m4module.h: Prototype extern functions from m4/m4.c.
        (m4): Declare type for new struct m4 objects.
        (M4SYMTAB): User macro to ease finding the symbol table for the
        current context for module developers.
        (m4_symbol_token): Renamed to m4_symbol_set_token which contains a
        verb.
        (M4_BUILTIN, m4_builtin_func, M4_BUILTIN_HANDLER)
        (m4_builtin_define, m4_builtin_pushdef, m4_builtin_table_install)
        (m4_call_macro, m4_dump_symbols, m4_expand_input)
        (M4_FINISH_HANDLER, M4_INIT_HANDLE, m4_macro_define)
        (m4_macro_pushdef, m4_macro_table_install, m4_module_load)
        (m4_module_unload, m4_process_macro, m4_symbol_set_token): Add an
        m4* context parameter. Changed definitions and all callers.
        (m4_symtab): Alias for m4_hash to decouple the
        m4_symtab api from m4_hash.
        (m4_symtab_apply, m4_symtab_apply_func): Use m4_symtab instead of
        m4_hash.
        (m4_symtab_create): New function to return an initialised
        m4_symtab.
        (m4_symtab_delete): New function to delete an m4_symtab's memory.
        (m4_symbol_define, m4_symbol_delete, m4_symbol_lookup)
        (m4_symbol_popdef, m4_symbol_pushdef): Add an m4_symtab parameter
        instead of simply using the global m4__symtab.  Changed
        definitions and all callers.
        * m4/m4private.h (m4__symtab_remove_module_references): Ditto.
        * m4/symtab.c (m4__symtab_init, m4__symtab_exit): Removed.
        * src/main.c (main): Create a context and use that instead of the
        former global m4__symtab.

2003-06-13  Gary V. Vaughan  <gary@gnu.org>

        * m4/hash.c (m4_hash_apply): Pass an initial hash table parameter
        to the callback.  Callbacks should not need to hardcode the
        hashtable they are working from, nor should we have to waste the
        userdata parameter to pass the table in.
        * m4/hash.h (m4_hash_apply_func): Require the initial table
        parameter.
        * m4/symtab.c (symtab_destroy): Use the passed table instead
        of hardcoding m4__symtab.
        (m4_symbol_popdef): Don't use the userdata parameter to pass the
        table to arg_destroy.
        (arg_destroy): Use the hash parameter, ignore userdata.
        * modules/m4.c (set_trace): Make it fit the m4_hash_apply_func
        prototype.
        (traceon, traceoff): Call set_trace with the extra initial
        parameter.

2003-06-13  Gary V. Vaughan  <gary@gnu.org>

        More refactoring to stabilise the module api, this time for
        symtab.c.  Additionally, start to pay attention to function names
        that don't contain a verb like they should.

        * m4/m4module.h (m4_symtab_apply): Reintroduced this function as a
        wrapper for m4_hash_apply to decouple the symtab module from the
        hash module.
        (m4_symbol_builtin, m4_symbol_macro): Renamed to
        m4__symbol_set_builtin and m4__symbol_set_macro.  Changed all
        callers.
        (m4_symbol_delete): Create a macro version to save a function
        call.
        (m4_token_t, m4_data_t): These violate the POSIX reserved
        namespace.  Renamed to m4_token_type and m4_symbol_type. Changed
        all callers.
        (m4_token_type): Renamed to m4_token_get_type.
        (m4_symtab, m4_symtab_init, m4_symtab_remove_module_references)
        (m4_symtab_exit): Removed from the exported module
        api...
        * m4/m4private.h (m4__symtab, m4__symtab_init)
        (m4__symtab_remove_module_references, m4__symtab_exit): ...and
        renamed and added to the internal api. Changed all callers.
        (m4_symtab_apply): A faster macro version of the function for
        users of the internal api.
        * m4/symtab.c (m4_symbol_destroy, m4_arg_destroy): Renamed to
        symbol_destroy and arg_destroy.
        (symtab_debug): Added a prototype.
        (m4_symtab_apply, m4_symbol_delete): Moved to the end of the file
        so that callers in this file get the faster macro versions from
        m4/m4private.h.

2003-06-12  Gary V. Vaughan  <gary@gnu.org>

        Refactoring modules to rationalise the API into an external
        documented (eventually!) API for use by modules in the `m4_'
        namespace declared in m4/m4module.h, an internal API between the
        source files we ship (including our shipped modules) in the `m4__'
        namespace declared in m4/m4private.h and making the rest as
        cohesive as possible with liberal use of the `static' keyword.
        This change represents an audit to m4/module.c along these
        guidelines.

        * m4/m4module.h (m4_module_close_all, m4_module_find_by_builtin):
        Removed.  No longer used.
        (m4_module_close): Removed prototypes.
        (m4_module_init, m4_module_open, m4_module_unload_all): Removed
        from the exported module api...
        * m4/m4private.h (m4__module_init, m4__module_open)
        (m4__module_exit): ...and renamed and added to the internal api.
        Changed all callers.
        (BUILTIN_SYMBOL, MACRO_SYMBOL, INIT_SYMBOL, FINISH_SYMBOL):
        Centralised definitions after renaming...
        * m4/module.c (M4_BUILTIN_SYMBOL, M4_MACRO_SYMBOL, M4_INIT_SYMBOL)
        (M4_FINISH_SYMBOL): ...and removing from here.
        (m4_module_dlerror, m4_module_remove, m4_module_close)
        (m4_caller_id): Not exported at all, so renamed to module_dlerror,
        module_remove, module_close and caller_id.
        (MODULE_SELF_NAME): New macro to make reporting self errors
        easier.
        (m4_module_load, module_close, module_remove): Use it.
        * m4/m4private.h (USER_MODULE_PATH_ENV): Macro to hold "M4MODPATH"
        name.
        * src/main.c (main): Use it.

2003-06-12  Gary V. Vaughan  <gary@gnu.org>

        * README: Remove references to --enable-changeword, which has been
        removed from the code.

2003-06-11  Gary V. Vaughan  <gary@gnu.org>

        Getting rid of the annoying bug with configure --enable-debug,
        which spewed -e: command not found errors.  This was an interaction
        between libtool-1.5's LT_AC_COMPILER_OPTION, and config/debug.m4.
        You'll need to re-bootstrap the m4 tree with cvs libtool (HEAD or
        branch-1-5) to get the full fix.

        * config/debug.m4 (M4_AC_CHECK_DEBUGGING): Require libtools version
        of AC_LIBTOOL_COMPILER_OPTION (which now requires LT_AC_PROG_SED),
        and then use the probed value of $SED.
        (AC_LIBTOOL_COMPILER_OPTION): Removed. Don't conditionally define
        this, it messes up the AC_REQUIRE stack.

2003-06-10  Gary V. Vaughan  <gary@gnu.org>

        * m4/symtab.c (m4_symbol_popdef): Need to pass the hash address to
        the destroy callback.
        (m4_arg_destroy): Use the hash address to free the hash node key
        field.

2003-06-06  Gary V. Vaughan  <gary@gnu.org>

        First cut at formal parameters in macros.

        * configure.ac (AC_REPLACE_FUNCS): Add xstrzdup.
        * m4/xstrzdup.c: New file.
        * m4/builtin.c (M4_ARG_SIGNATURE_DEFAULT_SIZE): Start size for
        associative array of parameter names to details.
        (m4_symbol_token): Capture macro names with parameter lists.
        (m4_arg_signature_parse): And build an associative array to hang
        from the symbol structure to map names to details.
        * m4/hash.c (m4_hash_new): Break the m4_hash_new followed by
        m4_hash_resize idiom.  Now that we potentially add a little hash
        table to many of the entries in the symbol table, added an extra
        arg to set the initial size.  Changed all callers.
        (m4_hash_apply): New function that is basically a generalised
        version of...
        * m4/symtab.c (m4_symbol_apply): ...this.  Now deleted.  Adjusted
        all callers to call m4_hash_apply instead.
        (m4_arg_destroy): Recycle memory used by an m4_token_arg.
        (m4_symbol_popdef): Use m4_arg_destroy to help recycle the
        m4_arg_signature association that might be attached to the symbol,
        * m4/hash.h (m4_hash_apply_func): Replacement type for...
        * m4/m4module.h (m4_symtab_apply_func): ...this.  Now deleted.
        (M4_SYNTAX_ASSIGN): Placeholder for assigning default values in
        parameter lists.
        (M4_IS_ASSIGN): Detect characters with M4_SYNTAX_ASSIGN syntax.
        (M4_IS_IDENT): Detect characters that can be safely used in
        parameter names.
        * m4/syntax.c (m4_syntax_init): Add an M4_SYNTAX_ASSIGN character.
        * m4/macro.c: Corrected grammar in some comments.  Use `token'
        rather than `td' for m4_token variables.
        (m4_process_macro): If we find a dollar followed by some
        M4_IS_IDENT characters, replace that with the contents of the argv
        entry with offset stored in the m4_token_arg associated with the
        collected identifier.

2003-06-05  Gary V. Vaughan  <gary@gnu.org>

        Begin preparations for supporting formal parameters in m4 macros.

        * m4/m4private.h (struct m4_token_arg): Placeholder for holding
        the details of a formal parameter.
        (m4_token): Add an arg_signature member to hold a hash table for
        looking up formal parameters.
        * m4/input.c: Update more bitrotted comments.
        (m4_push_builtin): Initialise arg_signature member.
        (init_builtin_token): Copy arg_signature member.
        * m4/m4module.h (m4_builtin_pushdef, m4_builtin_define)
        (m4_macro_pushdef, m4_macro_define): Rewritten as macros to
        replace...
        * m4/builtin.c (m4_builtin_pushdef, m4_builtin_define)
        (m4_macro_pushdef, m4_macro_define): ...these, And...
        (m4_symbol_token): ...wrapped around this new function, which
        vastly simplifies the arguments required by the functions it
        replaces.
        Changed all callers.

2003-06-05  Gary V. Vaughan  <gary@gnu.org>

        * m4/macro.c: Format changes.

2003-06-04  Gary V. Vaughan  <gary@gnu.org>

        * m4/input.c: Updated various bitrotted comments.
        (m4_push_builtin): Just pass the whole m4_token, rather than
        extracting all the fields in the caller.  This also allows us to
        check the token type for consistency.
        (macro_funcs, macro_peek, macro_read, m4_push_macro, CHAR_MACRO):
        Renamed to builtin_funcs, builtin_peek, builtin_read,
        m4_push_builtin and CHAR_BUILTIN for consistency with the rest of
        the code.  Changed all callers.
        (struct input_block): Similarly renamed u_m member to u_b, and
        changed all callers.
        (m4_next_token): Use bzero to initialise the data fields.
        * m4/m4module (m4_push_macro): Renamed to m4_push_builtin.

2003-05-29  Gary V. Vaughan  <gary@gnu.org>

        These changes were necessary to get m4 to build on my iBook
        running "powerpc-apple-darwin6.6" using Apples build of gcc "gcc
        (GCC) 3.1 20020420 (prerelease)":

        * src/main.c: Don't include dlfcn.h, ltdl.h handles correct
        inclusion of module loader headers.
        * modules/Makefile.am: Use AM_LDFLAGS, not LDFLAGS.
        * m4/Makefile.am: Ditto.
        (libm4_la_LIBADD): Added $(LTLIBINTL).
        * m4/utility.c (program_name): Removed declaration in favour of
        the one already in error.c!
        * m4/m4module.h (program_name): Define to program_invocation_name
        when using GNU C library. Use an explicit extern declaration.
        (interactive, sync_output, debug_level, hash_table_size)
        (no_gnu_extensions, prefix_all_builtins, max_debug_argument_length)
        (suppress_warnings, warning_status, nesting_limit, discard_comments)
        (lquote, rquote, bcomm, ecomm, m4_bad_argc, m4_skip_space)
        (m4_numeric_arg, m4_shipout_int, m4_shipout_string, m4_dump_args)
        (m4_debug, m4_debug_init, m4_debug_exit, m4_debug_decode)
        (m4_debug_flush_files, m4_debug_set_output, m4_debug_message_prefix)
        (m4_trace_prepre, m4_trace_pre, m4_trace_post, m4_sysval)
        (m4_expansion_level, m4_expand_ranges, m4_expand_input)
        (m4_call_macro, m4_process_macro, m4_syntax_table, m4_current_file)
        (m4_current_line, m4_current_diversion, m4_output_current_line):
        Don't rely on default, use an explicit extern.
        * m4/error.h (error, error_at_line, error_print_progname)
        (error_message_count, error_one_per_line): Ditto.
        * m4/ltdl.c: Update from CVS libtool.
        * m4/ltdl.h: Ditto.
        * commit: Update from CVS cvs-utils.

2002-11-04  gettextize  <bug-gnu-gettext@gnu.org>

        * po/Makefile.in.in: Upgrade to gettext-0.11.5.
        * po/boldquot.sed: New file, from gettext-0.11.5.
        * po/en@boldquot.header: New file, from gettext-0.11.5.
        * po/en@quot.header: New file, from gettext-0.11.5.
        * po/insert-header.sin: New file, from gettext-0.11.5.
        * po/quot.sed: New file, from gettext-0.11.5.
        * po/remove-potcdate.sin: New file, from gettext-0.11.5.
        * po/Rules-quot: New file, from gettext-0.11.5.

2002-11-04  Akim Demaille  <akim@epita.fr>

        * doc/m4.texinfo (Esyscmd): Don't grep, use something easier:
        running m4 itself.
        * tests/others.at (iso8859): Use abs_srcdir, not srcdir.

2002-11-04  Akim Demaille  <akim@epita.fr>

        * config/Makefile.am (ACLOCAL_MACROS): Ship the Gettext macros.

2002-11-04  Akim Demaille  <akim@epita.fr>

        * configure.ac: Automake 1.7.1, Autoconf 2.54, Gettext 0.11.5,
        used as `external', and Libtool 1.4.3.
        (LINGUAS): Remove.
        (LTLIBOBJS): Don't play with it.
        * intl/: Remove.
        * Makefile.am (SUBDIRS): Remove intl.
        (ACLOCAL_AMFLAGS): Add -I config.
        (EXTRA_DIST): Add config/config.rpath.
        * po/LINGUAS: New.
        * po/Makevars: New.
        * modules/perl.c (M4INIT_HANDLER): Don't prototype xs_init.

2002-05-29  Gary V. Vaughan  <gary@gnu.org>

        Preparations for refactoring syntax tables to allow reverse
        lookups [fetch me a M4_SYNTAX_OPEN], without compromising the
        speed of normal lookups in an array of unsigned short.

        * m4/input.c (single_quotes, single_comments, use_macro_escape):
        Moved from here...
        * m4/m4private.h (m4__single_quotes, m4__single_comments,
        m4__use_macro_escape): ...to here, and renamed.  The `m4__' prefix
        is for internal symbols which unavoidably pollute the global
        namespace, but are not published APIs.
        Adjusted all callers.
        * m4/input.c (m4_syntax_init, m4_syntax_code, m4_set_quotes,
        m4_set_comment, m4_set_syntax, set_syntax_internal,
        unset_syntax_attribute): Moved from this file...
        * m4/syntax.c: New. ...to this file.
        Also added an m4_syntax_exit stub for orthogonality.
        * src/main.c (main): Use it.
        * m4/Makefile.am (libm4_la_SOURCES): Add syntax.c.
        * m4/m4module.h: Reformatting.  New prototypes.

2002-05-29  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (aclocal_apiversion): The aclocal apiversion is
        distinct from the automake release number (in that the apiversion
        apparently has no micro-version-component).
        (aclocal_apilibdir): Use it.

2002-05-28  Gary V. Vaughan  <gary@gnu.org>

        * m4/hash.c (m4_hash_resize): New function.
        * m4/hash.h: Add prototype.
        * m4/symtab.c (m4_symtab_init):  Use it.  This could do with some
        benchmarking to find a good value for, say, autoconf.  This is
        already a little quicker than before for me.

        * m4/symtab.c (m4_symtab_hash, m4_symtab_cmp): Moved from here...
        * m4/hash.c (m4_hash_string_hash, m4_hash_string_cmp): .. to here,
        and reenamed.
        * m4/hash.h: Adjust prototypes.

2002-01-22  Akim Demaille  <akim@epita.fr>

        * bootstrap (aclocal_apilibdir): New, to cope with Automake's new
        APIVERSION scheme.
        * tests/Makefile.am (package.m4): New.
        * tests/atlocal.in: Adjust to CVS Autotest.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Use AC_LIBOBJ.
        * configure.ac: LIBOBJ is a forbidden string.
        Simplify AM_INIT_AUTOMAKE invocation.
        * config/Makefile.am (ACLOCAL_MACROS): Add amversion.m4 and
        options.m4.

2002-01-21  gettextize  <bug-gnu-utils@gnu.org>

        * po/Makefile.in.in: Upgrade to gettext-0.10.40.

2001-10-19  Akim Demaille  <akim@epita.fr>

        * m4/module.c, m4/output.c, src/main.c: Normalize error messages.

2001-10-19  Akim Demaille  <akim@epita.fr>

        * m4/input.c (m4_next_token): Display where was opened what is
        not closed.

2001-10-19  Akim Demaille  <akim@epita.fr>

        * m4/macro.c (expand_argument): Display where was opened what is
        not closed.

2001-10-18  Akim Demaille  <akim@epita.fr>

        * m4/input.c, modules/m4.c: Formatting changes.

2001-10-17  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap: s/configure.in/configure.ac/

2001-10-16  Gary V. Vaughan  <gary@gnu.org>

        * m4/symtab.c (m4_symbol_destroy): This function calls
        m4_symbol_popdef, which recycles a symbols memory when the last
        definition is popped.  Since we were passing the address of the
        symbol name found in the symbol table, and it was being removed
        partway through m4_symbol_destroy() we were referencing freed
        memory for the balance of the function.  Now we take a copy of the
        symbol name tring and use that as a key into the symbol
        table... that way if the original symbol name is freed, the copy
        is still valid.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * m4/ltdl.c: Update.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * src/main.c, src/freeze.c, m4/debug.c, m4/input.c, m4/macro.c:
        Don't gettextize internal error messages.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * tests/macros.at (Arity and defn): New failing test.
        (Arity, defn, and freeze): New.

        Fix `Arity and defn'.

        * m4/input.c (m4_push_macro): Don't forget the arity.
        * modules/m4.c (defn): Likewise.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * tests/builtins.at (pushdef/popdef, trace, trace2, trace3): Move
        to...
        * tests/macros.at (pushdef/popdef, Tracing Hanoi Towers)
        (Propagation of traceon, Propagation of --trace): this new file.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * m4/utility.c (m4_numeric_arg): Use the usual (argc, argv, ...)
        interface instead of (name, argc...).
        Upon failure, specify which argument was guilty.
        Adjust callers.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * modules/evalparse.c: Save translators' time: don't translate
        internal error messages.
        (m4_evaluate): Simplify/normalize error messages.
        * doc/m4.texinfo (Eval): Adjust.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * m4/macro.c (expand_macro): Let m4_bad_argc handle the cases
        where no checking is needed.
        * m4/utility.c (m4_bad_argc): Use the usual (argc, argv, ...)
        interface instead of (name, argc...).
        Adjust callers.
        * modules/gnu.c (m4_patsubst_do): Don't check argc, done
        elsewhere.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * m4/utility.c (m4_bad_argc): Display user argument counts, i.e.,
        exclude the builtin name from the count.
        * modules/m4.c (ifelse): Do not use the regular argc mechanism, as
        calling ifelse with a single argument is valid.
        * doc/m4.texinfo (Ifelse): Add an example where ifelse is invoked
        with 1 and 2 args, mostly to strengthen the test suite.

2001-10-13  Akim Demaille  <akim@epita.fr>

        * m4/output.c (m4_make_diversion, m4_insert_file)
        (m4_insert_diversion, +m4_freeze_diversions): Ansify.

2001-10-12  Gary V. Vaughan  <gary@gnu.org>

        * m4/input.c (init_builtin_token):  Renamed from init_macro_token,
        since we call these things builtins in the rest of the code!

        * modules/gnu.c (m4_regexp_compile): s/%0/%s/

2001-10-12  Gary V. Vaughan  <gary@gnu.org>

        Rather than forcing each builtin definition to manage its own
        argument range checking, tabulate the maxima and minima for all
        builtins in each module.  This forces us to consider what the
        valid ranges for each builtin should be, and moves the checking
        code out of each builtin implementation and into the builtin
        caller infrastructure.

        * m4/m4module.h (struct m4_builtin): Add argument minima and
        maxima.
        * m4/m4private.h (struct m4_token): Reflect them here too.
        * m4/input.c (struct input_block): ...and here.
        (m4_token_copy): New function for token copying.
        (init_macro_token): Copy them from a token to the input stack.
        (m4_next_token): Don't forget to initialise them for text
        macros.
        * m4/macro.c (expand_argument): Use m4_token_copy, and also
        check argument counts before calling the builtin handler.
        * m4/symtab.c (m4_symbol_builtin): Take minima and maxima params.
        (m4_symbol_macro): Likewise.
        * m4/builtin.c (m4_builtin_pushdef): Add min_args and max_args
        parameters.  Updated all callers.
        (m4_builtin_define): Ditto.
        (m4_macro_pushdef, m4_macro_define): Ditto.
        * m4/symtab.c (m4_symbol_builtin, m4_symbol_define): Ditto.
        * modules/evalparse.c:  Declare argument counts for defined
        builtins and remove explicit calls to m4_bad_argc().
        * modules/gnu.c: Ditto.
        * modules/load.c: Ditto.
        * modules/m4.c: Ditto.
        * modules/modtest.c: Ditto.
        * modules/mpeval.c: Ditto.
        * modules/perl.c: Ditto.
        * modules/shadow.c: Ditto.
        * modules/stdlib.c: Ditto.
        * modules/time.c: Ditto.
        * TODO: Updated.

2001-10-10  Gary V. Vaughan  <gary@gnu.org>

        The trace semantics now attach the trace bit to a symbol name.
        For as long as a traceon(`foo') is active, calls to foo will be
        traced regardless of intervening undefines or module unloads.
        Fixed the flag propogation issues differently to the fixes
        reverted with the last attempt at nailing down trace:

        * m4/m4private.h:  This file is not visible outside of the m4
        source tree, so I removed all the `M4_' and `m4_' prefixes to save
        on typing.  Updated all clients.
        (m4_token): New typedef contains the fields that need to be passed
        around with the low level tokeniser.
        (m4_token_data):  Removed.
        (m4_symbol): Now contains the traced flag again.
        * m4/symtab.c:  Rewritten again.  Now we don't remove symbols with
        the trace bit set.  This change is contained entirely within this
        module and doesn't leak out into the callers.  Updated all
        clients.
        (m4_symbol_builtin, m4_symbol_macro):  Adjusted to make use of the
        new fields in m4_token.  Updated all clients.
        * m4/builtin.c (m4_builtin_pushdef):  Needs a flags argument so
        that `groks_macro_args' and `blind_if_no_args' flags are retained
        when defn() results are passed around in m4 code.  Updated all
        callers.
        (m4_builtin_define): Ditto.
        (m4_macro_pushdef, m4_macro_define): Ditto.
        * m4/input.c (struct input_block): Add a flags field to facilitate
        the above.
        (m4_push_macro):  ...use it.
        (init_macro_token):  Retrieve it.
        (m4_next_token): Initialise it.
        * m4/macro.c (expand_argument):  Copy it.
        * m4/m4module.h: Adjust.
        * tests/builtins.at:  Adjust the expected output of the trace
        tests to reflect the change in semantics.
        * tests/modules.at (modules: trace):  Check that unloading a
        module which supplies a traced symbol definition doesn't lose te
        trace bit.

2001-10-07  Gary V. Vaughan  <gary@gnu.org>

        * modules/gnu.c (m4_macro_table): Display the timetamp when
        expanding __m4_version__.

        * configure.ac (--with-modules): Forgot a comma in the
        AC_HELP_STRING parameter list.

2001-10-05  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap: Remove aclocal.m4t when it is no longer required.

2001-10-05  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am: Adjust for gnuprog2.
        * tests/m4.in: There can be a leading path.
        * tests/modules.at (AT_CHECK_M4_MODTEST): No need for $4 and $5.
        * tests/testsuite.at: Adjust to the most recent Autotest.
        (AT_CHECK_M4_FILTER): Fix and rename as...
        (AT_TEST_M4): this.
        * tests/others.at: Use it.

        * config/gmp.m4 (_AC_LIB_GMP): In order to read the content of a
        variable in shell scripts, one uses `$'...

2001-10-04  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac: `rm -f $m4_getopt_h' was lost.

2001-10-04  Gary V. Vaughan  <gary@gnu.org>

        * configure.ac (TIMESTAMP): Display with AS_BOX at configure
        time.  Define it for config.h in order to...
        * src/main.c (main): ...display the timestamp for --version.

2001-10-04  Akim Demaille  <akim@epita.fr>

        * modules/gnu.c (m4_regexp_do, m4_patsubst_do): Extracted from
        previous builtins `regexp' and `patsubst'.
        (regexp, patsubst): Use them.
        (eregexp, epatsubst): New builtins.
        * doc/m4.texinfo (Patsubst, Regexp): Rename and complete as...
        (Epatsubst and Patsubst, Eregexp and Regexp): these.
        (Extensions): More info on REs.

2001-10-04  Akim Demaille  <akim@epita.fr>

        * modules/modtest.c (init_handler): Consistently output to stderr.
        (finish_handler): New.
        (test): The `if' is an `assert'.
        * tests/modules.at: Adjust.

2001-10-04  Akim Demaille  <akim@epita.fr>

        * m4/utility.c (m4_bad_argc): Detail the mismatches.

2001-10-01  Akim Demaille  <akim@epita.fr>

        * tests/generate.awk: Tag the tests with `documentation'.
        * tests/modules.at (AT_CHECK_M4_MODTEST): New.
        Use the make the existing modtest tests more uniform, and complete
        the set of possibilities.

2001-10-01  Akim Demaille  <akim@epita.fr>

        * config/gmp.m4: Consult the user before using GMP: use
        --without-gmp.
        * configure.ac: Adjust.
        * modules/gmp.c: No protection needed as the module is not built
        if GMP is not used.

2001-10-01  Akim Demaille  <akim@epita.fr>

        * tests/generate.awk: Remove debugging code.
        (fatal): Specify the current location.

        * m4/debug.c, m4/macro.c, m4/utility.c, modules/format.c,
        * modules/gnu.c, modules/m4.c: Use M4ARG.

2001-10-01  Akim Demaille  <akim@epita.fr>

        * modules/gnu.c (RE_SYNTAX_BRE, RE_SYNTAX_ERE): New.
        (m4_regexp_compile): New.
        (regexp, patsubst): Use it.

2001-09-30  Gary V. Vaughan  <gary@gnu.org>

        Reinstate the memory handling improvements from the patch I just
        reverted.  Relevant ChangeLog entries repeated here:

        * m4/module.c (m4_module_remove): New function that holds the core
        of the old m4_module_unload.
        (m4_module_unload): Use it.
        (m4_module_unload_all): When we know the modules will never be
        used again (i.e. on exit), free up as much module memory as
        possible.  There are still some artifacts from resident modules
        living inside ltdl.c, but everything else is freed.
        * m4/debug.c (m4_debug_exit): Free memory allocated in
        m4_debug_init().
        * m4/input.c (m4_input_exit): Ditto wrt m4_input_init().
        * m4/output.c (m4_output_exit): Ditto wrt m4_output_init ().
        * src/stackovf.c (stackovf_exit): Ditto wrt setup_stackovf_trap ().
        * m4/m4module.h: Updated prototypes.
        * m4/hash.c (m4_hash_exit): Free the nodes on the free list.
        * m4/hash.h: Updated prototypes.
        * src/main.c (main): Use all these new functions to clean up as
        much memory as possible before exit.

2001-09-30  Gary V. Vaughan  <gary@gnu.org>

        Reverted my large patch for removing the old m4_symbol
        structure on 2001-09-20.  We are still not happy about the way
        trace works in conjunction with defn and undefine, and leaving
        the reverted patch active prevents us from moving the traced
        bit from the definition back to the symbol.

2001-09-30  Gary V. Vaughan  <gary@gnu.org>

        * configure.in: Moved to...
        * configure.ac: ...here.  Added a libtool like timestamped
        banner, and tidied up the libltdl cruft.
        * config/mkstamp: Script to extract a timestamp from ChangeLog.
        * modules/Makefile.am (INCLTDL):  Removed.  This is required
        only when libltdl is configured in a subdirectory.
        * src/Makefile.am: Ditto.
        (LIBADD_DL):  No need to add this again, libtool already knows
        that libm4.la depends on it.
        * m4/Makefile.am: Automake sets variables from AC_SUBST.  Use
        them.

        * TODO: stackovf.c is basically broken.
        Reported by Marc Espie <espie@schutzenberger.liafa.jussieu.fr>

2001-09-28  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (EXTRA_DIST): `m4' is not to be shipped.

2001-09-27  Akim Demaille  <akim@epita.fr>

        * tests/m4.in: Don't use short options.
        Simplify the stderr signature normalization.

2001-09-27  Akim Demaille  <akim@epita.fr>

        tests/m4 shall be position independent.

        * tests/m4.in: New.
        * tests/m4: Remove.
        * tests/testsuite.at: No args to AT_INIT.
        * configure.in, tests/Makefile.am: Adjust.

2001-09-22  Akim Demaille  <akim@epita.fr>

        Autotest has changed again.

        * tests/Makefile.am (DISTCLEANFILES): Add package.m4.
        (package.m4): Remove.
        * configure.in: Adjust to LIBADD_GMP.

2001-09-21  Gary V. Vaughan  <gary@gnu.org>

        * config/gmp.m4 (AC_ARG_WITH): Removed.
        (GMP_LIB): Renamed to LIBADD_GMP for consistency.
        (AC_LIB_GMP): When performing a test compile against libgmp,
        include the header gmp.h if possible, and link against -lgmp.  If
        they both work define USE_GMP.
        * modules/Makefile.am (mpeval_la_LIBADD): Add LIBADD_GMP.
        (mpeval_LTX_init_func): Complain on load that there was no libgmp
        at compile time.

2001-09-20  Gary V. Vaughan  <gary@gnu.org>

        * m4/evalparse.c: Moved to...
        * modules/evalparse.c:  ...here.  This code is shared between
        modules/mpeval.c and modules/m4.c, so there is no need to pollute
        the libm4 API with its details.  Moderately rewritten to interface
        into its clients more simply.
        * m4/eval.c: Deleted.  Migrated functionality to...
        * modules/m4.c: ...here.
        (builtin_eval):  Implemented in terms of the new interface style.
        * modules/mpeval.c (builtin_mpeval): Ditto.
        * m4/m4module.h: Removed references to the former m4/eval.c.
        * m4/Makefile.am (libm4_la_SOURCES):  Removed eval.c.
        (EXTRA_libm4_la_SOURCES): Deleted.
        * modules/Makefile.am (EXTRA_m4_la_SOURCES): Reference evalparse.c.
        (EXTRA_mpeval_la_SOURCES): Reference evalparse.c.

2001-09-20  Akim Demaille  <akim@epita.fr>

        * config/gmp.m4 (AM_WITH_GMP): Rename as...
        (AC_LIB_GMP): this.
        By default, use gmp.
        Massive revamping.
        * configure.in: Adjust.
        Use Automake conditionals for USE_GMP.
        Always compute sizeof (long long int).
        This was a bug BTW, as `eval' (not `mpeval') depends on it:
        before, it was used _only_ if mpeval was not activated.
        * modules/Makefile.am (pkglibexec2dir, +pkglibexec2_LTLIBRARIES)
        (mpeval_la_LIBADD): New macros.
        * modules/mpeval.c: No longer be conditioned by WITH_GMP.
        Indent.
        * tests/Makefile.am ($(srcdir)/$(TESTSUITE)): Create package.m4.
        * tests/atlocal.in, tests/builtins.at: Depend upon USE_GMP, not
        WITH_GMP.

2001-09-20  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (package.m4): New.
        * tests/testsuite.at: Adjust AT_INIT and AT_VICTIMS.

2001-09-20  Gary V. Vaughan  <gary@gnu.org>

        More cleanup.  After the last patch, m4_symbol holds nothing but
        the head of a chain of m4_token_data.  So I have removed the old
        m4_symbol, so that m4_token_data chains are stored directly in the
        value cell of a hash table node.  But there's more... m4_symbol
        was a more natural name for the symbol value cell, and now that it
        is gone I have renamed the former m4_token_data structure to
        m4_symbol.  This change turned out to be a pig to get right, since
        the original code didn't need to modify the value cell itself,
        since changing the chain happened inside the m4_symbol that used
        to be returned -- I had to pass the address of the value cell
        across various function calls, incase the head value changed.  I
        also tightened up the memory management to help me find a nasty
        memory corruption bug that took me all night to track down...

        * m4/m4private.h (struct m4_symbol): Removed.
        (struct m4_token_data): Renamed to `struct m4_symbol'.  Updated
        all references.
        * m4/hash.c (m4_hash_iterator_value): Return the address of the
        value cell.  Updated all callers.
        * m4/symtab.c: Took advantage of the simplification in the data
        structures to rewrite a lot of this file more simply.  There is
        still some room for optimisation here, but we should tackle that
        systematically closer to the release.

        * m4/ltdl.c: Added dmalloc support, and fixed some memory leaks it
        revealed.  This version is ahead of CVS libtool until I get chance
        to flush my changes.
        * m4/module.c (m4_module_remove): New function that holds the core
        of the old m4_module_unload.
        (m4_module_unload): Use it.
        (m4_module_unload_all): When we know the modules will never be
        used again (i.e. on exit), free up as much module memory as
        possible.  There are still some artifacts from resident modules
        living inside ltdl.c, but everything else is freed.
        * m4/debug.c (m4_debug_exit): Free memory allocated in
        m4_debug_init().
        * m4/input.c (m4_input_exit): Ditto wrt m4_input_init().
        * m4/output.c (m4_output_exit): Ditto wrt m4_output_init ().
        * src/stackovf.c (stackovf_exit): Ditto wrt setup_stackovf_trap ().
        * m4/m4module.h: Updated prototypes.
        * m4/hash.c (m4_hash_exit): Free the nodes on the free list.
        * m4/hash.h: Updated prototypes.
        * src/main.c (main): Use all these new functions to clean up as
        much memory as possible before exit.

2001-09-18  Gary V. Vaughan  <gary@gnu.org>

        The `traced' flag needs to be attached to the definition of a
        symbol rather than the current symbol containing the definition.
        Implementing this showed up some long standing post 1.4 bugs in
        flag propogation which I also fixed.

        * m4/m4private.h (struct m4_symbol): Remove the traced flag.
        (struct m4_token_data): And add it back in here.
        * m4/input.c (init_macro_token): Propogate the traced flag
        correctly.
        * m4/macro.c (expand_argument): Ditto.
        * tests/builtins.at (trace2, trace3): New tests based on Akim's
        sadistic email ;-)

2001-09-08  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4private.h (struct m4_token_data): Simplified by removing
        the redundant `traced' flag, and one level of structure nesting.
        (M4_TOKEN_DATA_FUNC_TRACED): Removed.
        * m4/input.c (init_macro_token): No need to initialise removed
        `traced' field.
        * m4/macro.c (expand_argument): No need to copy it either.
        * m4/utility.c (m4_token_data_func_traced): Or provide an access
        function.

        * m4/hash.c (m4_hash_bucket_insert): Symbol shadowing is no longer
        dependant on multiple symbols with the same key, so preserving
        relative symbol order in each bucket during resizing is no longer
        required.  The resize function is considerably faster as a result.

        * m4/m4module.h, m4/builtin.c, m4/symtab.c:
        s/m4_symbol_insert/m4_symbol_define/g;
        s/m4_builtin_insert/m4_builtin_define/g;
        s/m4_macro_insert/m4_macro_define/g.  Updated all callers.

2001-09-08  Gary V. Vaughan  <gary@gnu.org>

        Get rid of m4_symbol_lookup_t entirely.  With Akim's earlier
        commits, the m4_lookup_symbol dispatch function is split into
        specialised functions that must be called directly.

        * m4/m4module.h (m4_symbol_lookup_t): Removed.
        * m4/symtab.c (m4_lookup_symbol): Removed.
        (m4_symbol_builtin, m4_symbol_macro): New functions.
        * m4/builtin.c (m4_builtin_define): Split into...
        (m4_builtin_pushdef, m4_builtin_insert): ...these.
        (m4_macro_define): Split into...
        (m4_macro_pushdef, m4_macro_insert): ...these.
        * src/main.c (main): Set command line macros from `-D' parameters
        using `m4_macro_define'.

2001-09-08  Gary V. Vaughan  <gary@gnu.org>

        * m4/symtab.c (m4_symtab_remove_module_references):  Renamed as
        this from m4_remove_table_reference_symbols().
        * m4/m4module.h, m4/module.c: Updated all references.

2001-09-07  Akim Demaille  <akim@epita.fr>

        * modules/stdlib.c, modules/times.c: Misc cleanups.

2001-09-07  Akim Demaille  <akim@epita.fr>

        * configure.in: We now need Autoconf 2.52e.
        * m4/m4module.h (m4_symbol_lookup_t): Remove `M4_SYMBOL_POPDEF'
        and `M4_SYMBOL_DELETE'.
        * m4/symtab.c (m4_lookup_symbol, symtab_debug): Adjust.
        * src/main.c (main): Adjust.

2001-09-06  Gary V. Vaughan  <gary@gnu.org>

        Fix the obstack.h problem once and for all!  At configure time we
        can test for a system supplied obstack.h:  depending on the
        result, we now generate system.h with an #include of the correct
        header.  As a bonus, I've also added a --with-included-obstack,
        incase the user doesn't like the system obstack for some
        reason... and also we can test the shipped obstack on a system
        that has oe of its own.  We also now need to be careful to add
        build directories to the include search path, since the generated
        system.h will be in the build tree.

        * configure.in (AC_CONFIG_FILES): Generate system.h from
        system-h.in.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Determine whether to
        include the system obstack header or the copy shipped with M4.
        Allow the user to override configure and force the build to use
        the shipped version.
        * m4/system-h.in: New file, template for...
        * m4/system.h: ...this.  Now deleted.
        * m4/m4module.h: Include system.h before everything else.
        * src/freeze.c: Ditto.
        * m4/Makefile.am (dist-hook): Remove generated system.h.
        (INCLUDES): Check builddir for generated headers before checking
        srcdir.
        * modules/Makefile.am (INCLUDES): Ditto.
        * src/Makefile.am (INCLUDES): Ditto.

2001-09-05  Gary V. Vaughan  <gary@gnu.org>

        * TODO: Remove the items that have been addressed already.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * src/main.c (main): Standardize --version.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * modules/format.c (format): Have a bigger `str'.

2001-09-05  Akim Demaille  <akim@epita.fr>

        Rationalize warnings, reporting the macro name as if it were a
        program name, and assertions.

        * m4/m4module.h (m4_lookup_symbol): Prototype, it is still used.
        (M4WARN): New.
        * m4/symtab.c (m4_lookup_symbol, m4_symbol_popdef)
        (m4_symbol_delete):
        Use assert for internal errors.
        * m4/utility.c (m4_bad_argc, m4_numeric_arg, m4_dump_symbols): Use
        M4WARN.
        * modules/m4.c (undefine, defn, traceon, traceoff, dumpdef): use
        M4WARN and assert.
        * tests/builtins.at (pushpop): Adjust.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * m4/symtab.c (m4_symbol_insert): Don't use `foo () || bar ()'
        with pointers.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * m4/m4module.h (m4_symbol_lookup): Remove M4_SYMBOL_LOOKUP.
        * m4/macro.c, m4/symtab.c: Adjust.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * m4/symtab.c (m4_symbol_popdef, m4_symbol_delete): Rename as...
        (m4_symbol_pop, m4_symbol_del): this.
        (m4_symbol_lookup, m4_symbol_pushdef, m4_symbol_insert)
        (m4_symbol_popdef, m4_symbol_delete): New.
        (m4_lookup_symbol): Adjust.
        * m4/m4module.h, src/main.c, modules/gnu.c, modules/m4.c: Adjust.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * m4/m4module.h (m4_symbol_lookup): Rename as...
        (m4_symbol_lookup_t): this.

2001-09-05  Akim Demaille  <akim@epita.fr>

        * m4/m4module.h (m4_symbol_lookup): Remove M4_SYMBOL_IGNORE,
        unused.
        * m4/symtab.c (m4_lookup_symbol): Adjust.

2001-09-03  Gary V. Vaughan  <gary@gnu.org>

        Bootstrap will now work with Libtool 1.4.1 or higher:
        * bootstrap: Remove stale autom4te.cache files when
        rebootstrapping.
        * config/Makefile.am (ACLOCAL_MACROS):  Add ltdl.m4 and
        libtool.m4.
        * bootstrap: Ignore acinclude.m4 now the we include ltdl.m4 and
        libtool.m4 directly.
        Run libtoolize to refresh ltmain.sh.
        * config/ltmain.sh:  Deleted.
        * acinclude.m4: Deleted.
        * m4/ltdl.c, m4/ltdl.h: Updated from libtool-1.4.1.

        * config/debug.m4 (AC_LIBTOOL_COMPILER_OPTION): Provide a fallback
        implementation for the cvs impaired libtool user.

2001-09-03  Akim Demaille  <akim@epita.fr>

        * m4/symtab.c (m4_lookup_symbol): Give more details when reporting
        internal errors.
        Avoid using `default' in switch, as it hides useful compiler
        warnings when a case is forgotten.

2001-09-03  Akim Demaille  <akim@epita.fr>

        * src/main.c (MODULE_SHORTOPT, MODULEPATH_SHORTOPT): Remove, there
        is no such thing as `WITH_MODULES'.

2001-09-03  Akim Demaille  <akim@epita.fr>

        Improve the test suite's selfcontainedness.

        * doc/m4.texinfo: Let `input.m4' be the input file, not `in'.
        (Include, Undivert): Tag the other input files.
        * tests/generate.awk: Catch `@comment file:'.
        `-I $src' is no longer needed.
        `next' is really like `return': the rest is skipped.
        Adjust to `input.m4'.
        (fatal): New function.
        * tests/foo, tests/incl.m4: Remove.

2001-09-01  Gary V. Vaughan  <gary@gnu.org>

        The shadowing mechanism and, infact, the whole symbol table
        implementation was creaking under the weight of the features piled
        on top of it.  We now have a separate hash table module which will
        dynamically resize to keep symbol density withing good performace
        limits, and a new symtab module layered above it.  Symbol lookups
        are now marginally more efficient (since the shadowed flag is no
        longer required) and symbol removal, such as on module unload, is
        considerably faster due to a reorganisation of the data structures
        used in symtab.c.

        * src/main.c (main):  Don't mention `-H'.
        * doc/m4.texinfo (Invoking m4): Document that -H no longer has any
        effect.
        * NEWS: Updated.
        * m4/hash.c: New generalised dynamic hash table data structure
        management module.
        * m4/hash.h: Public interface.
        * m4/Makefile.am (pkginc_HEADERS): Add hash.h.
        (libm4_la_SOURCES): Add hash.c.
        * m4/symtab.c: More or less rewritten from scratch, within the
        bounds of the previous API.
        (m4_symtab_apply): A cleaner version of the old hack_all_symbols
        call.  Updated all callers.
        * m4/m4module.c: #include <m4/hash.h>, and changed all affected
        declarations to reflect API changes.
        (M4INIT): Generate a declaration too, to avoid the warning with
        --enable-debug builds.
        (M4FINISH): Ditto.
        (HASHMAX): Removed.
        * m4/utility.c (hash_table_size):  Removed.
        (m4_dump_symbols): Rewritten to build and qsort an array of symbol
        names, which are then looked up by builtin_dumpdef() as necessary.
        This implies a small speedup in builtin_symbols(), which discarded
        all of the symbol info under the old call.
        * m4/m4private.h (m4_symbol): Removed shadowed flag -- symbol
        shadowing is implicit in respect to the new data structures.
        symbol names are no longer duplicated here, they are stored in the
        key field of the hash table.
        Moved macro_args and blind_no_args...
        (m4_token_data): ...to here.
        m4/macro.c (expand_macro):  Added a name argument since the symbol
        name is no longer copied into each struct m4_symbol.  Modified all
        callers.
        (collect_arguments):  Ditto.
        * modules/m4.c (set_trace): Ditto.
        * modules/gnu.c (builtin_symbols): Updated.
        * src/freeze.c (produce_symbol_dump): Much improved in light of
        the improved symbol table layout.

2001-09-01  Gary V. Vaughan  <gary@gnu.org>

        * m4/m4private.h (SYMBOL_NEXT): Move into m4's name space; renamed
        to M4_SYMBOL_NEXT.
        (SYMBOL_TRACED): Similarly renamed by prefixing with `M4_'.
        (SYMBOL_SHADOWED, SYMBOL_MACRO_ARGS, SYMBOL_BLIND_NO_ARGS,
        SYMBOL_NAME, SYMBOL_TYPE, SYMBOL_TEXT, SYMBOL_FUNC,
        SYMBOL_HANDLE): Ditto.
        * m4/builtin.c, m4/macro.c, m4/symtab.c, m4/utility.c,
        modules/gnu.c, modules/m4.c, src/freeze.c,
        src/main.c:  Updated all references.

        * src/Makefile.am (m4_SOURCES): Don't list $(M4OBJS) here, since
        Automake 1.5 chokes on dynamic source file lists,  Besides, it is
        already listed in m4_LDADD... how did that ever used to work?
        * configure.in (getopt.h): Use AC_CONFIG_LINKS instead of a manual
        link.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Ditto.
        Suggested by Tim Van Holder <tim.van.holder@pandora.be>

        * tests/m4: Don't call the m4 wrapper script with libtool, it
        works fine all by itself.

2001-08-30  Gary V. Vaughan  <gary@gnu.org>

        The experimental `changeword' feature never took off, and has
        no obvious advantages over `changesyntax' to compensate the
        enormous speed penalty it carries:
        * configure.in (ENABLE_CHANGEWORD): Removed.
        * m4/m4module.h (m4_set_word_regexp): Removed.
        * m4/m4private.h (m4_token_data): Removed original_text field.
        * m4/utility.c (m4_token_data_orig_text): Removed.
        * m4/input,c: Removed all conditional ENABLE_CHANGEWORD code.
        * m4/macro.c: Ditto.
        * src/main.c: Ditto.
        * modules/Makefile.am (changeword.la): Removed.
        * modules/changeword.c: File removed.
        * doc/m4.texinfo: References to changeword and --word-regexp
        removed.
        * po/POTFILES.in: modules/changeword.c removed.
        * tests/atlocal.in (ENABLE_CHANGEWORD): Removed.
        * tests/builtins.at (changeword): Test removed.

2001-08-30  Akim Demaille  <akim@epita.fr>

        * bootstrap.sh: Create aclocal.m4 instead of modifying it.
        This also help having a single list of m4 files: in
        config/Makefile.am.
        * config/Makefile.am (STANDARD_MACROS): Rename as...
        (ACLOCAL_MACROS): this.
        (list-standard-macros): Remove.
        (spy): New.

2001-08-29  Gary V. Vaughan  <gary@gnu.org>

        In an attempt to moderate my egomania...
        * tests/modules.at: Remove attributions.

        * tests/generate.awk: When making substitutions to "@&t@", either
        "&" or "\&" in the substitution string argument to gsub refer back
        to the matched text.  "@\\&t@" seems to work though, Tests 43 and
        67 now pass for me.

2001-08-29  Akim Demaille  <akim@epita.fr>

        * tests/others.at (changeword, ddivert, debug, esyscmd, exp, gmp)
        (include, indir, multiquotes, patsubst, pushdef/popdef, regexp)
        (sync-lines, trace, translit, undivert, wrap): Move to...
        * tests/builtins.at: this new file.
        * tests/others.at (Discard comments, import-environment): Move to...
        * tests/options.at: this new file.

2001-08-29  Akim Demaille  <akim@epita.fr>

        * tests/others.at (Freezing modules)
        (--module-directory: absolute path, modpath2, modpath3)
        (M4MODPATH: absolute path, modtest, shadow, unload): Move to...
        * tests/modules.at: here, new file.
        * tests/others.at, tests/generate.awk: Add a banner.
        * tests/testsuite.at: Adjust.
        (AT_CHECK_M4_FILTER): New, but unused.

2001-08-29  Akim Demaille  <akim@epita.fr>

        * tests/testsuite.at (AT_CHECK_M4): Don't pass -I, let the tests
        handle that.
        * tests/others.at (wrap): Inline wrap.m4.
        (shadow): Inline shadow.m4.
        (iso8859): Don't specify the path from top_srcdir, but from srcdir.
        * tests/m4: Simplify.

2001-08-29  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am ($(srcdir)/$(TESTSUITE)): Use autom4te's
        --language.

2001-08-29  Akim Demaille  <akim@epita.fr>

        * tests/generate.awk (normalize): s/@__@/@&t@/.

2001-08-28  Akim Demaille  <akim@epita.fr>

        * examples/indir.m4, tests/others.at (indir): s/nonsens/nonsense/.

2001-08-28  Gary V. Vaughan  <gary@gnu.org>

        * bootstrap (generate.awk): Generate test cases with new script.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (installcheck-local): Don't use
        `dc_install_base' which is not visible here, but `exec_prefix'
        which is clearly the RT anyway.
        * tests/testsuite.at (AT_CHECK_M4): Don't pass -M here since it is
        related to testing a now installed m4.
        * tests/m4: Do it here.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * tests/others.at (indir): Formatting change.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (installcheck-local): New.
        * tests/testsuite.at (AT_CHECK_M4): Pass `-b' so that C-c works on
        the test suite.
        Prefer options over envvars.
        * src/main.c (main): First bug caught by the test suite (yeah!):
        --batch lacked a `break' which resulted in an accidental
        invocation of --discard-comments.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * tests/others.at (capitalize, changeword, comments, ddivert)
        (debug, esyscmd, exp, foreach, forloop, fstab, hanoi, include)
        (misc, multiquotes, patsubst, pushdef/popdef, regexp, reverse)
        (sysv-args, trace, translit, undivert): Don't rely on files in
        examples/: AT_DATA them.

2001-08-27  Akim Demaille  <akim@epita.fr>

        Let the test suite use a wrapper around the not installed m4 to
        pretend it is (installed).

        * bootstrap (aclocal.m4): Output AC_SUBST's and AM_CONDITIONAL's in
        such a way that m4 does not process them.
        * configure.in: The package name seems to be `m4', not `M4'.
        * tests/m4: New.
        * tests/atlocal.in (at_package, M4): Remove.
        * tests/testsuite.at, tests/others.at: Use m4, not $M4.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (CLEANFILES): Remove.
        (DISTCLEANFILES, clean-local): New.
        * examples/mktests.sh: Remove.

2001-08-27  Akim Demaille  <akim@epita.fr>

        * Makefile.am (AUTOMAKE_OPTIONS): 1.5.
        Don't use aclocal: it's written by hand.
        * aclocal.m4: m4_include all the files instead of being built by
        aclocal.
        * bootstrap: Help automake find the AC_SUBSTs and AM_CONDITIONALs
        until it reads the traces by itself.
        * configure.in: Require Autoconf 2.42c as we are now using
        AC_CONFIG_TESTDIR instead of AT_CONFIG.
        Catch unexpanded `jm_' macros.
        * config/atconfig.m4: Remove.
        * config/error.m4: new.
        * config/Makefile.am: Ship the files included by aclocal.m4.
        * tests/Makefile.am (TESTSUITE_SOURCES): Rename as...
        (TESTSUITE_AT): this, to please Automake.
        (TESTSUITE): This target uses autotest/autotest.m4, not
        autotest/general.m4.
        * tests/testsuite.at: Prereq Autotest 2.52c.
        * examples/Makefile.am (pkgdata_DATA): Rename as...
        (dist_pkgdata_DATA): this.
        * doc/Makefile.am (man_MANS): Rename as...
        (dist_man_mans): this.

2001-08-20  Gary V. Vaughan  <gary@gnu.org>

        * m4/system.h [cygwin*]:  Thanks to Paul Sokolovsky and
        Robert Collins, building on Cygwin no longer requires Windows
        import and export symbol decorations.
        * m4/m4module.h (M4_SCOPE) [cygwin*]:  Deleted all occurences.
        * m4/error.h (M4_SCOPE) [cygwin*]: Ditto.
        * m4/debug.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/error.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/input.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/macro.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/output.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/utilty.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * m4/xmalloc.c (M4_GLOBAL_DATA) [cygwin*]:  Ditto.
        * configure.in (LIBM4_DLL_IMPORT) [cygwin*]:  Don't set this
        anymore.
        * src/Makefile.am (AM_CPPFLAGS) [cygwin*]: Don't use it either!
        * modules/Makefile.am (AM_CPPFLAGS) [cygwin*]: Ditto.

2001-08-20  Gary V. Vaughan  <gary@gnu.org>

        Ansify the source.  Previously we had a mix, where my code was
        in a K&R compatible style, and the preexisting code was in ANSI
        style.  Nothing is lost wrt release 1.4 by reverting to ANSI,
        and now the code base is much cleaner.

        * m4/system.h:  Remove M4_PARAMS macro and all users.  Remove
        VOID macro and all users.
        * m4/m4module.h:  Ansify function prototypes and headers.
        * m4/builtin.c:  Ditto.
        * m4/evalparse.c:  Ditto.
        * m4/input.c:  Ditto.
        * m4/macro.c:  Ditto.
        * m4/module.c:  Ditto.
        * m4/output.c:  Ditto.
        * m4/path.c:  Ditto.
        * m4/symtab.c:  Ditto.
        * m4/utility.c:  Ditto.
        * modules/format.c:  Ditto.
        * modules/gnu.c:  Ditto.
        * modules/m4.c:  Ditto.
        * modules/mpeval.c:  Ditto.
        * src/freeze.c:  Ditto.
        * src/m4.h:  Ditto.
        * src/main.c:  Ditto.

2001-08-20  Akim Demaille  <akim@epita.fr>

        * config/atconfig.m4: s/EOF/ATEOF/, so that configure can be
        generated with stock 2.52.

2001-08-20  Akim Demaille  <akim@epita.fr>

        * config/atconfig.m4: New, until part of Autoconf per se.
        * configure.in (AT_CONFIG): Use it.
        Adjust.
        * tests/mkconfig.sh, tests/atconfig.in, tests/defs: Remove.
        * tests/atlocal.in: New.
        * tests/generate.awk: For the time being, the empty quadrigraph is
        `@__@'.
        * tests/others.at (changeword, gmp): Check the configuration
        variable against `yes'.
        * tests/testsuite.at (dnl): Allow it, as it's used all over the
        place.

2001-08-20  Akim Demaille  <akim@epita.fr>

        * m4/utility.c (m4_numeric_arg): Spell out the culprit.
        * modules/m4.c (undivert): Disable the possibility of undiverting
        several files at once: it is not documented, it is inconsistent
        with the other macros, it can be straightforwardly mocked by
        several invocations, and most importantly, it prevents the
        possibility of other kinds of extension.
        Use `m4_numeric_arg'.

2001-08-20  Akim Demaille  <akim@epita.fr>

        * examples/include.m4: Typo.
        * tests/generate.awk: Really add it.
        * tests/Makefile.am: Adjust.
        * tests/others.at (Discard comments): It sure fails without `-c'.
        (include, undivert): Add -I examples/.

2001-08-20  Akim Demaille  <akim@epita.fr>

        Use sprintf, not ecft and friends since it is standard, portable,
        simplifies the code, and since the latter is even deprecated
        according to the GNU libc documentation.

        * modules/format.c: Drop evct support.

2001-08-19  Gary V. Vaughan  <gary@gnu.org>

        * config/debug.m4 (M4_AC_CHECK_DEBUGGING): Cleaned up.  Don't test
        for `-pipe' here...
        * configure.in: ...do it here instead.

        * c-boxes.el: Deleted.
        * m4/builtin.c: Reformat box comments to be closer to GNU
        standards.
        * m4/debug.c:  Ditto.
        * m4/eval.c:  Ditto.
        * m4/evalparse.c:  Ditto.
        * m4/input.c:  Ditto.
        * m4/m4module.h:  Ditto.
        * m4/macro.c:  Ditto.
        * m4/output.c:  Ditto.
        * m4/symtab.c:  Ditto.
        * m4/utility.c:  Ditto.
        * modules/changeword.c:  Ditto.
        * modules/format.c:  Ditto.
        * modules/gnu.c:  Ditto.
        * modules/load.c:  Ditto.
        * modules/m4.c:  Ditto.
        * modules/modtest.c:  Ditto.
        * modules/mpeval.c:  Ditto.
        * modules/perl.c:  Ditto.
        * modules/shadow.c:  Ditto.
        * modules/stdlib.c:  Ditto.
        * modules/time.c:  Ditto.
        * src/freeze.c:  Ditto.
        * src/main.c:  Ditto.

2001-08-17  Gary V. Vaughan  <gary@gnu.org>

        * m4/module.c: Fixup some errors in the description comment.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * tests/others.at (iso8859): Specify the path to the M4 test file.
        * tests/testsuite.at (AT_CHECK_M4): Normalize the path of input
        files in error messages.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * tests/testsuite.at (AT_CHECK_M4): Anchor M4PATH in $top_srcdir.
        * tests/others.at: Adjust input files paths.
        * tests/atconfig.in: Set top_builddir.
        * tests/Makefile.am: Adjust.
        `testsuite' is in src, not build.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * tests/Makefile.am (EXTRA_DIST): Ship generate.awk.
        (generate.at): Install a temporary hack until the actual
        generate.awk is added to the repository.
        * tests/atconfig.in: New.

2001-08-17  Akim Demaille  <akim@epita.fr>

        Really apply the patch ``Drop Autoconf 2.13 compatibility.''

2001-08-17  Akim Demaille  <akim@epita.fr>

        * doc/m4.texinfo: Promote proper quotation.

2001-08-17  Akim Demaille  <akim@epita.fr>

        Remove the non Autotest tests.

        * tests/other-tests/capitalize.test,
        * tests/other-tests/changeword.test,
        * tests/other-tests/comments.test, tests/other-tests/ddivert.test,
        * tests/other-tests/debug.test,
        * tests/other-tests/discard-comments.m4,
        * tests/other-tests/discard-comments.test,
        * tests/other-tests/esyscmd.test, tests/other-tests/exp.test,
        * tests/other-tests/foreach.test, tests/other-tests/forloop.test,
        * tests/other-tests/frozen.m4, tests/other-tests/fstab.test,
        * tests/other-tests/gmp.m4, tests/other-tests/gmp.test,
        * tests/other-tests/hanoi.test,
        * tests/other-tests/import-environment.m4,
        * tests/other-tests/import-environment.test,
        * tests/other-tests/include.test, tests/other-tests/indir.test,
        * tests/other-tests/iso8859.m4, tests/other-tests/iso8859.test,
        * tests/other-tests/misc.test, tests/other-tests/modfreeze.test,
        * tests/other-tests/modpath1.test, tests/other-tests/modpath2.test,
        * tests/other-tests/modpath3.test, tests/other-tests/modpath4.test,
        * tests/other-tests/modtest.test,
        * tests/other-tests/multiquotes.test,
        * tests/other-tests/patsubst.test, tests/other-tests/pushpop.test,
        * tests/other-tests/regexp.test, tests/other-tests/reverse.test,
        * tests/other-tests/shadow.test, tests/other-tests/stackovf.test,
        * tests/other-tests/sync-lines.m4,
        * tests/other-tests/sync-lines.test,
        * tests/other-tests/sysv-args.test, tests/other-tests/trace.test,
        * tests/other-tests/translit.test, tests/other-tests/undivert.test,
        * tests/other-tests/unfrozen.m4, tests/other-tests/unload.test,
        * tests/other-tests/wrap.test: Remove.

        * tests/run-test, tests/get-them: Remove.
        * tests/Makefile.am: Adjust.

2001-08-17  Akim Demaille  <akim@epita.fr>

        others.at no longer depends on other-tests/.

        * tests/others.at (stackovf): You're actually...
        (sync-lines): this.
        (modfreeze, modpath1, modpath2, modpath3, modpath4, modtest, shadow)
        (unload.test): Keep their authorship.
        (discard-comments, gmp, import-environment, modfreeze)
        (sync-lines): Embed the input files.
        * tests/stackovf.test: Copy from other-tests/stackovf.test.
        * tests/iso8850.m4: Copy from other-tests/iso8859.m4.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * doc/m4.texinfo (Esyscmd): Fix the paths in the Vice example.
        (M4exit): Tag the exit status of the example.
        * tests/get-them: Adjust.
        * tests/generate.awk: New, based on get-them.
        * tests/Makefile.am: Adjust to generate `generated.at'.
        * tests/testsuite.at: Adjust.
        (AT_CHECK_M4): Don't overquote.  Blush...

2001-08-17  Akim Demaille  <akim@epita.fr>

        Start using Autotest.  atconfig creation is still lacking.

        * examples/patsubst.m4, modules/modtest.m4, modules/shadow.m4,
        * examples/reverse.m4, tests/other-tests/import-environment.m4,
        * tests/other-tests/iso8859.m4: Don't produce trailing blanks.
        * tests/other-tests/import-environment.test: Don't check LANGUAGE
        as it might be `unset', or set to `C'.
        * tests/other-tests/iso8859.test, tests/other-tests/modpath1.test,
        * tests/other-tests/modpath2.test, tests/other-tests/modpath3.test,
        * tests/other-tests/modpath4.test, tests/other-tests/modtest.test,
        * tests/other-tests/patsubst.test, tests/other-tests/reverse.test,
        * tests/other-tests/shadow.test: Adjust.
        * tests/testsuite.at, tests/others.at: New.
        * tests/Makefile.am: Adjust.

2001-08-17  Akim Demaille  <akim@epita.fr>

        Drop Autoconf 2.13 compatibility.

        * configure.in (changeword): No need to undefine it, as anyway if
        it's defined, M4sugar moved it as m4_changeword.
        And anyway, proper quotation is enough.
        (m4_pattern_allow): As it exists in 2.50, just use it.
        (AC_OUTPUT): Split in AC_CONFIG_FILES and AC_CONFIG_COMMANDS.
        Don't handle Gettext's duties, let it handle them.
        * config/gnu-obstack.m4: Use m4_pattern_allow directly.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * modules/m4.c (m4_dumpdef): Output to stderr, not m4_debug.
        (m4_errprint): Use fputs.
        * doc/m4.texinfo (Invoking m4) <--error-output>: errprint and
        dumpdef are not concerned.
        (Dumpdef, Errprint): Emphasize their insensitivity to
        --error-output.
        * doc/Makefile.am: Add `TAGS' support.
        (MAINTAINERCLEANFILES): Remove texinfo.tex and mdate-sh which are
        in `config/' now.
        * config/Makefile.am (MAINTAINERCLEANFILES): New.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * modules/Makefile.am (ETAGS_ARGS): New.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * m4/symtab.c (m4_hack_all_symbols, m4_lookup_symbol): Formatting
        changes.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * m4/builtin.c (m4_macro_define): Do not reset SYMBOL_TRACED.

2001-08-17  Akim Demaille  <akim@epita.fr>

        * m4/m4module.h (m4/list.h): Don't include it.

2001-08-16  Gary V. Vaughan  <gary@gnu.org>

        m4_modules are no more, we use lt_dlhandles directly and let
        latest libltdl features manage the list of loaded modules.
        * acinclude.m4: Regenerated.
        * m4/ltdl.c: Updated from master copy.
        * m4/module.c: Reimplemented to take advantage of advances in
        libltdl.
        * m4/builtin.c (m4_builtin_find_by_name): Traverse loaded module
        list with lt_dlhandle_next.
        (m4_builtin_find_by_func): Ditto.
        (m4_builtin_table_install): Use lt_dlhandle.
        (m4_macro_define): Ditto.
        (m4_macro_table_install): Ditto.
        m4/module.h: Prototype new module management API.
        (m4_modules): No longer required.
        (m4_module_init_t, m4_module_finish_t): POSIX namespace
        violations, renamed to...
        (m4_module_init_func, m4_module_finish_func): ...these,
        respectively.
        (M4INIT_HANDLER): Clean way to declare init functions in modules.
        (M4FINISH_HANDLER):  And similarly for finish functions.
        * m4/system.h (_CONC): Used by M4INIT_HANDLER and M4FINISH_HANDLER
        -- Add indirection to the CONC macro so that arguments are
        correctly expanded.
        * modules/modtest.c (m4_init_module):  Replaced with M4INIT_HANDLER.
        * modules/shadow.c (m4_init_module):  Ditto.
        Due to new init function semantics, be careful to perform the
        initialisation only on first load.
        * modules/perl.c (m4_init_module):  Ditto. And Ditto.
        (m4_finish_module): Replaced with M4FINISH_HANDLER.
        Due to new finish function semantics, be careful to perform the
        finalisation only on first load.
        * m4/m4private.h (m4_module): Removed in favour of...
        (m4_module_data): ...structure without all the wrapper fields.
        Instances of this new structure are stored associated lt_dlhandles
        with lt_dlcaller_data_set().
        * m4/builtin.c (m4_builtin_define): Takes a handle argument
        instead of the old module argument.
        (m4_builtin_table_install): Ditto.
        * modules/load.c (m4_resident_module):  Removed.  This is no
        longer implemented as a magic symbol...
        * modules/m4.c (m4_resident_module): Ditto.
        * modules/load.c (M4INIT_HANDLER): ...the module init function now
        uses the ltdl api to make the module resident.
        * modules/m4.c (M4INIT_HANDLER): Ditto.
        * modules/load.c (builtin_modules): Traverse the loaded module
        list with lt_dlhandle_next.
        (builtin_load): Much simplified in light of the reimplemented
        module loader.
        * src/freeze.c (produce_module_dump):  Cleaned up and optimised in
        light of the m4/module.c rewrite.
        (produce_symbol_dump): Ditto.
        (reload_frozen_state): Ditto.
        * m4/list.c, m4/list.h: Files deleted.  No longer required.
        * m4/Makefile.am (pkginc_HEADERS): Delete list.h reference.
        (libm4_la_SOURCES): Delete list.c reference.
        * m4/m4private.h (m4_token_data):  Add a handle field.  This
        eliminates many of the searches to find the handle associated with
        various tokens that are passed between functions.
        (struct m4_symbol):  Removed the module field.  The
        module association does not belong with the symbol...
        * m4/input.c (struct m4_builtin): ...it belongs with the builtin
        that the module implementation code is from.  Added a handle
        field.
        (m4_push_macro): Add a `handle' argument.  Changed all callers.
        (init_macro_token):  Set the `handle' field for the
        m4_token_data.
        * m4/macro.c (expand_argument): Copy the new handle field during
        reassignment.
        * modules/m4.c (macro_install): Use the new handle field to
        optimise the search for the correct builtin structure, and pass
        the handle details to m4_builtin_define.

2001-08-15  Akim Demaille  <akim@epita.fr>

        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Be sure `m4/' exists
        when creating `m4/obstack.h'.
        * tests/Makefile.am (TESTS_ENVIRONMENT): Pass top_srcdir and
        top_builddir.
        * tests/defs: Make them absolute.
        (CDPATH) Neutralize.
        * tests/gethem: Use them.

2001-08-14  Gary V. Vaughan  <gary@gnu.org>

        * config/ltmain.sh: Doh!  Import again for a quoting fix that
        prevented any regression test from passing.

        * m4/m4module.h (obstack.h): Choose between installed version
        and shipped version based on configure tests.
        * src/freeze.c (obstack.h): Ditto.

        * acconfig.h: Removed.  No longer required.

        * bootstrap: Rewritten to play nicely with Autoconf 2.5x.
        * configure.in (MY_NAME, MY_VERSION): Define these once, and feed
        them to AC_INIT and AM_INIT_AUTOMAKE.
        * Makefile.am (AUTOMAKE_OPTIONS): Remove `gnits' which would
        disallow MY_NAME and MY_VERSION arguments to AM_INIT_AUTOMAKE.
        * config/gnu-obstack.m4 (M4_AC_FUNC_OBSTACK): Don't choke on
        shell variable m4_cv_func_obstack_h.
        * tests/defs (M4): Be more careful about relative path to libtool
        script and m4 binary by using $srcdir.

        * src/main.c (main): Use lt_dlinsertsearchdir to prepend -M
        optargs to the existing libltdl search path.
        * acinclude.m4: Regenerate from latest libtool,m4 and ltdl.m4.
        * m4/ltdl.c: Updated.
        * m4/ltdl.h: Ditto.
        * config/ltmain.sh: Ditto.

2001-08-11  Gary V. Vaughan  <gary@gnu.org>

        * src/main.c (main): Add `-b' (for `batch') mode switch to force
        interactive mode off.

2001-08-10  Akim Demaille  <akim@epita.fr>

        * configure.in: Require Autoconf 2.52.
        (AC_ARG_PROGRAM): Remove, handled by Automake.
        (m4_getopt): Rename as...
        (m4_getopt_h): this.
        Allow the tokens `m4_cv_*', `m4_top_srcdir', and `m4_getopt_h'.
        Undefine `changeword' only if defined.
        * config/gnu-obstack.m4: Require Autoconf 2.52.
        (M4_AC_FUNC_OBSTACK): Rename `m4_obstack' and `m4_obstack_h'.
        Allow this token.

2001-08-09  Yuji Minejima  <ggb01164@nifty.ne.jp>

        * doc/m4.texinfo: Fix some typos, and apply some small
        clarifications.

2001-08-09  Andreas Schwab  <schwab@suse.de>

        * src/main.c (main): Fix improper uses of error (missing format
        string).

2001-08-07  Akim Demaille  <akim@epita.fr>

        Improve `make distcheck'.

        * configure.in: Be sure to be able to run `mkconfig.sh' when src
        != build.
        * Makefile.am (dist-hook): Remove, as it is no longer needed.
        * doc/m4.texinfo (Include): Add missing blank.
        * m4/Makefile.am (EXTRA_DIST): Distribute gnu-obstack.h and
        obstack.c.

2001-08-07  Akim Demaille  <akim@epita.fr>

        * m4/evalparse.c: A better introductory comment.
        * m4/m4module.h (M4_DEBUG_PRINT2): s/M4_debug/m4_debug/.
        * m4/macro.c: Adjust old comments.
        * modules/README: Typo.

2001-08-07  Akim Demaille  <akim@epita.fr>

        * config/gnu-obstack.m4: New.

2001-08-07  Akim Demaille  <akim@epita.fr>

        * config/Makefile.am, config/stackovf.m4: New.
        * configure.in, Makefile.am: Adjust.

2001-08-05  gettextize  <bug-gnu-utils@gnu.org>

        * po/Makefile.in.in: Upgrade to gettext-0.10.39.
        * po/cat-id-tbl.c: Remove file.
        * po/stamp-cat-id: Remove file.

2001-04-08  Roderick Koehle <Roderick.Koehle@infineon.com>

        * modules/format.c (format):  Formatting for %f was not
        interpreting the position of the decimal point correctly for
        whole numbers.

2000-12-01  Gary V. Vaughan  <gary@gnu.org>

        * TODO:  Removed m4exit bug.
        * modules/load.c (m4_resident_module): Make this module resident.
        * module/m4.c (m4_resident_module): Ditto.
        * m4/modules.c (m4_module_load):  Use new ltdl resident modules
        feature to mark modules as resident if they export
        `m4_resident_module' as TRUE.
        (m4_module_unload): Do not remove resident modules, and take care
        with symbol insertion and deletion with resident modules.
        * m4/ltdl.c, m4/ltdl.h: Update to latest unreleased versions to
        use resident modules feature.

2000-11-30  Gary V. Vaughan  <gary@gnu.org>

        * TODO: Updated.  Removed some cruft that has since been fixed
        or implemented.  Added some more entries.
        * NEWS: Updated.
        * README: Updated.
        * modules/README: Updated.
        * doc/m4.texinfo: Updated.

        * modules/gnu.c (builtin_functions): Make indir orthogonal to
        builtin, in that each is recognised as a macro only with parameters
        (builtin_indir): Passing 0 arguments is now an error, as with
        builtin.

        * src/main.c (usage): Added missing description of `-c' option.

2000-11-29  Gary V. Vaughan  <gary@gnu.org>

        Consolidate the myriad of dispersed test scripts into the
        tests subdirectory.  I think I now have all the file where I
        want them, so there shouldn't be anymore upheaval =)O|
        Honest!
        * tests/Makefile.am: Updated to run the new tests added below.
        * tests/other-tests/capitalize.test, tests/other-tests/comments.test,
        tests/other-tests/ddivert.test, tests/other-tests/debug.test,
        tests/other-tests/esyscmd.test, tests/other-tests/exp.test,
        tests/other-tests/foreach.test, tests/other-tests/forloop.test,
        tests/other-tests/frozen.m4, tests/other-tests/fstab.test,
        tests/other-tests/hanoi.test, tests/other-tests/include.test,
        tests/other-tests/indir.test, tests/other-tests/misc.test,
        tests/other-tests/modfreeze.test, tests/other-tests/modpath1.test,
        tests/other-tests/modpath2.test, tests/other-tests/modpath3.test,
        tests/other-tests/modpath4.test, tests/other-tests/modtest.test,
        tests/other-tests/multiquotes.test, tests/other-tests/patsubst.test,
        tests/other-tests/pushpop.test, tests/other-tests/regexp.test,
        tests/other-tests/reverse.test, tests/other-tests/shadow.test,
        tests/other-tests/sysv-args.test, tests/other-tests/trace.test,
        tests/other-tests/translit.test, tests/other-tests/undivert.test,
        tests/other-tests/unfrozen.m4, tests/other-tests/unload.test,
        tests/other-tests/wrap.test:  New tests based on the contents
        of the tests removed below.
        * examples/Makefile.am, modules/Makefile.am:  Updated to
        reflect removed tests.
        * examples/defs,modules/defs: Removed.
        * examples/capitalize.test, examples/comments.test,
        examples/ddivert.test, examples/debug.test,
        examples/esyscmd.test, examples/exp.test,
        examples/foreach.test, examples/forloop.test,
        examples/fstab.test, examples/hanoi.test,
        examples/include.test, examples/indir.test,
        examples/misc.test, examples/multiquotes.test,
        examples/patsubst.test, examples/pushpop.test,
        examples/regexp.test, examples/reverse.test,
        examples/sysv-args.test, examples/trace.test,
        examples/translit.test, examples/undivert.test,
        examples/wrap.test, modules/frozen.m4, modules/modfreeze.test,
        modules/modpath1.test, modules/modpath2.test,
        modules/modpath3.test, modules/modpath4.test,
        modules/modtest.test, modules/shadow.test,
        modules/unfrozen.m4, modules/unload.test: Removed.

        Move the implementation of GMP support for the mpeval() builtin
        into a loadable module that depends on libgmp.  mpeval() and
        eval() share a common parser, now in m4/evalparser.c; the code
        in m4/numb.c and m4/numb.h is now physically split between
        m4/eval.c (the eval() backend) and modules/mpeval.c (the
        mpeval() backend), rather than being differentiated by cpp
        macros and multiple inclusion.  The mpeval module is always
        built but will generate an diagnostic if it is used from an
        installation that didn't link in the gmp library.
        * modules/Makefile.am: build and install the new mpeval module.
        * modules/mpeval.c: Now contains the former parts of m4/numb.c
        and m4/numb.h that are required for gmp support in mpeval().
        * m4/Makefile.am (libm4_la_SOURCES): Removed evalmp.c.
        * m4/evalmp.c:  Removed.
        * m4/m4module.h: Removed conditional prototype for
        m4_mp_evaluate().
        * m4/eval.c: Rewritten.  Contains the former parts of m4/numb.c
        and m4/numb.h that do not rely on gmp.
        * m4/evalparse.c:  New file, contains the shared parts of the
        eval() and evalmp() parser implementations, and is no longer
        unencumbered by cpp magic to uncover the right parts.
        * m4/numb.h:  Removed.  It's former contents are split between
        m4/eval.c and modules/mpeval.c.
        * m4/numb.c: ditto.

        * tests/other-tests/changeword.test: New test.  Rudimentary
        testing of changeword builtin runs only if --wnable-changeword
        was used at configure time.
        * tests/mkconfig.sh: Solaris sed (at least) does not parse nested
        alternation correctly.  Split into two expressions to compensate.
        * m4/input.c (m4_input_init): Use m4_ prefix on m4_set_word_regexp.
        * modules/Makefile.am: Build changeword module.
        * modules/changeword.c (m4_macro_table): Define __m4_changeword__
        only when --enable-changeword was passed to configure.
        (builtin_changeword): If --enable-changeword was not used, then
        report that changeword() builtin has no support in m4 binary.

2000-11-28  Gary V. Vaughan  <gary@gnu.org>

        * src/main.c (main): Fixed a particularly nasty bug is
        user_search_path setting -- the -M flag processing must be
        extremely careful with search path ordering, or else the default
        installed module directory (possibly containing modules from a
        previous release) is placed earlier in the search path than any -M
        arguments (which are relied upon to load uninstalled modules with
        most of the tests in the regresion suite).

        * modules/load.c (builtin_load):  Nasty hack to prevent adding
        symbols to symtab again if a module is loaded more than once.
        * modules/m4.c (builtin_ifelse): removed unused variable argv0.

        * m4/symtab.c (m4_remove_table_reference_symbols):  Fixed a
        possible NULL pointer dereference.

        * m4/module.c (m4_module_find_by_modname): Renamed from
        m4_module_modname_find.   Fixed all references.
        (m4_module_find_by_builtin):  New function.

        * modules/modfreeze.test: load the `load' module with each
        invocation.
        * src/freeze.c (produce_frozen_state): Simplified in light of
        module field in m4_symbol.  Allow a third argument for text macros
        to name the originating module.
        (reload_frozen_state): ditto.
        * m4/m4module.h:  Fixup prototypes.
        * m4/builtin.h (m4_builtin_define): Add a module argument so
        that symbols can be registered against the defining module.
        (m4_macro_define): ditto.
        * m4/m4private.h (m4_symbol): Make the module field const to save
        on casting in the rest of the code.
        (SYMBOL_MODULE): New macro.

        * m4/symtab.c (m4_remove_table_reference_symbols): Fixed stupid
        symbol reference maintenance bugs when removing a symbol from the
        symtab.

        * src/stackovf.c (setup_stackovf_trap): Fixed some memory leaks.

2000-11-27  Gary V. Vaughan  <gary@gnu.org>

        * configure.in (m4_cv_func_obstack): A better check for whether
        libc has an obstack implementation.
        * m4/Makefile.am (EXTRA_libm4_la_SOURCES): add gnu-obstack.h.

        * configure.in (--with-modules): Changed semantics.  This
        option is now used to list modules to be preopened.
        * src/m4.h: #include "ltdl.h" unconditionally.
        * src/main.c: Removed all dependencies on WITH_MODULES.
        * src/freeze.c: ditto.
        * modules/Makefile.am: ditto.
        * m4/m4.c (builtin_m4exit): ditto.
        * modules/modpath1.test: ditto.
        * modules/modpath2.test: ditto.
        * modules/modpath3.test: ditto.
        * modules/modpath4.test: ditto.
        * modules/modtest.test: ditto.
        * modules/shadow.test: ditto.
        * modules/unload.test: ditto.

        * m4/Makefile.am (libm4_la_SOURCES): Removed obstack.c, since it
        comes up on demand in LTLIBOBJS now.
        * configure.in (getopt_long):  Creating and relying on a link for
        getopt.h on hosts with no getopt_long() of thier own works
        correctly now.  This is necessary so that callers of getopt_long()
        can simply `#include <getopt.h>': the naive way of doing this
        would end up using our own getopt.h and the installed
        getopt_long(), which is asking for trouble!
        (obstack_init): A similar argument applies to obstack.h and
        obstack_init().

        * m4/ltdl.c: Upgraded to latest bleeding edge version again.
        On Solaris-2.5 (at least) the native dlopen implementation
        gets confused about m4.o when looking for module "m4".  This
        version always looks for .la an .$lib_ext suffixed names first
        to work around the problem.  Sigh.

        * po/POTFILES.in: Take account of these file movements.
        * src/Makefile.am (m4_SOURCES): removed eval.c.
        (EXTRA_m4_SOURCES): removed numb.c and numb.h.
        * m4/Makefile.am (libm4_la_SOURCES): added eval.c.
        (EXTRA_libm4_la_SOURCES): added numb.c and numb.h.
        * modules/m4.c (builtin_eval): Use m4_evaluate().
        * m4/eval.c: Moved here from src/eval.c to facilitate
        implementation of eval() builtin as part of the `m4' loadable
        module.
        (m4_evaluate): renamed from evaluate for namespace cleanliness.
        * m4/numb.c: Moved here from src/numb.c, since it is #included
        into eval.c at compile time.
        * m4/m4module.h (m4_evaluate): Added prototype.
        * src/m4.h (evaluate): Removed prototype.

2000-11-25  Gary V. Vaughan  <gary@gnu.org>

        * modules/perl.c (builtin_perleval):  Use PL_na for
        compatibility with perl-5.6.

        * src/main.c (main):  It is now safe to
        ``m4_module_install("m4")'', without tripping over the m4
        binary itself!
        * m4/ltdl.h, m4/ltdl.c: Upgraded to latest bleeding edge
        versions having fixed the insidious module search order bug.

        * m4/Makefile.am (libm4_la_LIBADD): New magic -- we are
        supposed to be using @LIBADD_DL@; @DLLDFLAGS@ is dead.

        * configure.in: Figure out whether to use the installed
        getopt.h or the supplied one.
        * src/Makefile.am: ditto.

        * po/POTFILES.in: List files in their new positions.

        * config/ltmain.sh:  This needs to be checked in to match the
        libtool macros copied to acinclude.m4 (until a released
        libtool copes with m4's needs).
        * bootstrap:  Run gettextize.

2000-11-24  Gary V. Vaughan  <gary@gnu.org>

        * AUTHORS:  Added my details.
        * TODO: updated.
        * NEWS: updated.
        * bootstrap: temporary update until released libtool catches up.

        * All files:  Use new GNU GPL copyright blurb with current contact
        address.

        * configure.in (LTLIBOBJS): Use canonical code for calculation of
        this variable.

        * config: renamed acm4 directory to config to be more like
        other autoconfiscated packages.

        * configure.in (M4_AC_CHECK_DEBUGGING): Use it.
        * config/debug.m4:  New file implementing configure macros to add
        suitable debug flags to the compiler invocation.

        * modules/load.c:  New file implementing the ``load'' and
        ``unload'' builtins.
        * tests/get-them:  Set the module search directory to the modules
        build directory in generated tests.
        * modules/shadow.test: ditto.
        * modules/modtest.test: ditto.
        * modules/modpath1.test: ditto.
        * modules/modpath2.test: ditto.
        * modules/modpath3.test: ditto.
        * modules/modpath4.test: ditto.
        * modules/modtest.test: ditto.
        * modules/modfreeze.test: ditto.
        * modules/unload.test: ditto.

        * modules/changeword.c:  New file implementing the ``changeword''
        builtin as a loadable module.
        * modules/mpeval.c:  New file implementing the ``mpeval'' builtin
        as a loadable module.

        * src/main.c (main):  Load the gnu module if m4 was started
        normally -- i.e. without the -G option.
        * modules/gnu.c:  New file implementing a new loadable module wuth
        definitions for all the gnu extension builtins.
        * modules/format.c:  Moved here from src/format.c.  Now included
        directly by gnu.c.

        * src/main.c (main):  Load the traditional module if m4 was
        started in `no_gnu_extensions' mode.
        * modules/traditional.c:  New file implementing the ``unix'' macro,
        required when m4 is executed in traditional mode, as a loadable
        module.

        * src/main.c:  Renamed from m4.c to avoid confusion with
        modules/m4.c.
        (main):  Always load the m4 module.
        * modules/m4.c:  New file implementing a new loadable module with
        definitions for all m4 builtins that are not gnu extensions.

        * m4/Makefile.am:  Adjusted to take new files below into account.
        * m4/m4module.h: Prototypes for exported functions and types moved
        to this directory from the src directory.
        * m4/m4private.h: Moved here from src/m4private.h to facilitate
        the migration of all builtin implementations to loadable modules.
        * m4/macro.c: Moved this file here from the src directory,
        renaming all exported symbols to use the prefix ``m4_''.
        * m4/builtin.c: ditto.
        * m4/module.c: ditto.
        * m4/symtab.c: ditto.
        * m4/debug.c: ditto.
        * m4/input.c: ditto.
        * m4/output.c: ditto.
        * m4/path.c: ditto.
        * m4/ltdl.h, m4/ltdl.c: ditto.
        * m4/utility.c: Odd functions moved here from files in the src
        directory to facilitate builtin migration.

2000-08-12  Gary V. Vaughan  <gary@gnu.org>

        * src/builtin.c (dump_symbols): Use "Undefined name `%s'" for
        error message, to make translators' jobs a little easier.
        (builtin_builtin): ditto.
        (builtin_traceon): ditto.
        (builtin_traceoff): ditto.
        Reported by Akim Demaille <akim@epita.fr>

        * m4/Makefile.am (pkgincdir):  Deleted.  Use automake's built in
        pkgincludedir instead.

        * m4/m4module.h (rquote): Renamed with a prefix of `m4_' since
        it is exported globally.  Fixed all references.
        (lquote): ditto.
        (bcomm): ditto.
        (ecomm): ditto.
        (DEF_RQUOTE): Renamed with a prefix of `M4_' since it is exported
        globally.  Fixed all references.
        (DEF_LQUOTE): ditto.
        (DEF_BCOMM): ditto.
        (DEF_ECOMM): ditto.

2000-07-28  Gary V. Vaughan  <gary@gnu.org>

        * NEWS: updated.
        * TODO: updated.

        * configure.in (AC_CHECK_FUNCS): added bzero and calloc.
        (AC_OUTPUT): touch stamp-h.in, not stamp-h.

        * doc/m4.texinfo: Fixed to work with --html option of makeinfo.
        Removed `Prev', `Next' and `Up' fields of all @nodes now that
        makeinfo calculates them for us, and to make any future
        reorganisation easier.
        (Frozen files): Document format version 2.
        `V' now takes argument `2'.
        `F' can take a single argument if symbol and builtin names
        are the same, or 3 arguments if the builtin is from a module.
        New `S' specification for saving syntax table contents.
        New `M' specification for saving loaded module names.
        * src/freeze.c: Implement them.
        * src/input.c (syntax_code): For interpreting frozen syntax
        state.

        * examples/Makefile.am:  Add the contents of the WWW directory to
        the distribution.
        * examples/WWW/Makefile:  ditto,
        (%.htm): Compares file contents (not just sizes) to determine
        whether a change has occured.
        * examples/WWW/_header.htm: Bumped version number.
        * examples/WWW: Regenerated content.

        * m4/Makefile.am (AUTOMAKE_OPTIONS): Support for non-ANSI
        compilers comes much easier without ansi2knr.
        * src/Makefile.am (AUTOMAKE_OPTIONS): ditto.

        * m4/list.c: New generic list container type.
        * m4/list.h: Interface to new container type.
        * m4/Makefile.am (pkginc_HEADERS): Install list.h.
        (libm4_la_SOURCES): compile and link list.c.
        * src/builtin.c (builtin_tables): Use list container.
        * src/module.c (symtab): ditto.
        * src/symtab.c (symtab): ditto.

        * m4/system.h: New file for common preprocessor definitions.
        * m4/Makefile.am (pkginc_HEADERS): install system.h.
        * m4/error.c: Use system.h in place of inline preprocessor.
        * m4/error.h: ditto.
        * m4/module.c: ditto.
        * m4/module.h: ditto.
        * m4/xmalloc.c: ditto.

        * m4/error.h (error_one_per_line): Make M4_GLOBAL_DATA for WIN32
        compatibility.
        * m4/xmalloc.c (xmalloc_exit_failure): ditto.

        * m4module.h (syntax_table): Renamed with a prefix of `m4_' since
        it is exported globally.  Fixed all references.
        (builtin): ditto.
        (module_init_t): ditto.
        (module_finish_t): ditto.
        (token_data): ditto.
        (SYNTAX_OTHER): Renamed with a prefix of `M4_' since
        it is exported globally.  Fixed all references.
        (SYNTAX_IGNORE): ditto.
        (SYNTAX_SPACE): ditto.
        (SYNTAX_OPEN): ditto.
        (SYNTAX_CLOSE): ditto.
        (SYNTAX_COMMA): ditto.
        (SYNTAX_DOLLAR): ditto.
        (SYNTAX_ACTIVE): ditto.
        (SYNTAX_ESCAPE): ditto.
        (SYNTAX_ALPHA): ditto.
        (SYNTAX_NUM): ditto.
        (SYNTAX_ALNUM): ditto.
        (SYNTAX_LQUOTE): ditto.
        (SYNTAX_RQUOTE): ditto.
        (SYNTAX_BCOMM): ditto.
        (SYNTAX_ECOMM): ditto.
        (SYNTAX_VALUE): ditto.
        (SYNTAX_MASKS): ditto.
        (IS_OTHER): ditto.
        (IS_IGNORE): ditto.
        (IS_SPACE): ditto.
        (IS_OPEN): ditto.
        (IS_CLOSE): ditto.
        (IS_COMMA): ditto.
        (IS_DOLLAR): ditto.
        (IS_ACTIVE): ditto.
        (IS_ESCAPE): ditto.
        (IS_ALPHA): ditto.
        (IS_NUM): ditto.
        (IS_ALNUM): ditto.
        (IS_LQUOTE): ditto.
        (IS_RQUOTE): ditto.
        (IS_BCOMM): ditto.
        (IS_ECOMM): ditto.
        (TOKEN_EOF): ditto.
        (TOKEN_NONE): ditto.
        (TOKEN_STRING): ditto.
        (TOKEN_SPACE): ditto.
        (TOKEN_WORD): ditto.
        (TOKEN_SIMPLE): ditto.
        (TOKEN_MACDEF): ditto.

        * m4/m4module.h (voidstar): Removed in favour of `VOID' for
        consistency.  Fixed all references.
        (STRING): Renamed to `m4_string' for consistency, and because if
        is exported globally.  Fixed all references.
        (token_type): Renamed to `m4_token_t' for the same reasons.
        (token_data_type): Renamed to `m4_token_data_t' for the same
        reasons.

        * m4/m4module.h (XCALLOC): Wrapper macro which handles type
        sizes.
        (XMALLOC): ditto.
        (XREALLOC): ditto.
        (XFREE): Wrapper macro which avoids freeing NULL pointers.

        * m4/m4module.h (m4_macro):  New type for module defined user
        macros.
        * modules/modtest.c (m4_macro_table):  Define module user macros.
        * modules/shadow.c (m4_macro_table):  ditto.

        * m4/m4module.h (M4BUILTIN_HANDLER):  For defining handlers
        declared with M4BUILTIN.

        * m4/xmalloc.c: Use memset if bzero is not available when
        emulating calloc with malloc.
        (xcalloc): Fallback to malloc/bzero if calloc is not available.
        (xfree): Added for consistency.  Will not try to free NULL
        pointers.
        * src/m4.c (xfree):  Deleted in favour of the above.
        * m4/xmalloc.c (WITH_DMALLOC): preprocess away the entire file if
        linking with libdmalloc.
        * m4/xstrdup.c (WITH_DMALLOC): ditto.

        * modules/frozen.m4:  New test case.
        * modules/unfrozen.m4:  ditto.
        * modules/modfreeze.test:  New test.
        * modules/unload.test:  ditto.
        * modules/Makefile.am (EXTRA_DIST):  Distribute them.
        (TESTS): Use them.
        * modules/modpath1.test:  Don't try this test if module support is
        not compiled in.
        * modules/modpath2.test: ditto.
        * modules/modpath3.test: ditto.
        * modules/modpath4.test: ditto.
        * modules/modtest.test: ditto.
        * modules/shadow.test: ditto.

        * modules/perl.c: New module.
        * modules/perl.m4: Example of using it.
        * modules/Makefile.am (perl_la_SOURCES):  Build new perl module.

        * src/m4.c (main): Assume interactive mode if STDIN is connected
        to a tty.
        Changed startup sequence slightly so that syntax is not
        initialised from here when loading a frozen file.

        * src/builtin.c:  Much improved macro definition style.
        * src/m4private.h:  Internal structures for m4_builtin and
        m4_macro instances.  These are not exposed to module writers.
        * src/module.c (module_modname_find):  Find a module structure
        from the its name.
        (make_macro_table):  Build an internal macro table from a external
        definition.
        (make_builtin_table):  Build an internal builtin table from an
        external definition.

        * src/module.c (module_unload): Be extremely careful to remove
        builtins and macros that match the module being unloaded -- no
        longer assume that the top element can be removed incase another
        odule defines an identical name.
        * src/symtab.c (remove_table_reference_symbols): remove all symbol
        table entries which refer to a given builtin table.
        * src/builtin.c (remove_tables): Use it!

2000-07-13  Thomas Tanner  <tanner@ffii.org>

        * Makefile.am (SUBDIRS): we need modules/ for "make dist"
        * acm4/modules.m4: deleted
        * bootstrap: don't libtoolize libltdl!
        * configure.in: AC_SUBST INCLTDL and LIBLTDL, -with-modules flag:
        if set, enable WITH_MODULES and add modules to DLPREOPEN
        * examples/misc.test: redirect standard output
        * lib/Makefile.am: don't use DLLDFLAGS
        * lib/m4module.c: include necessary headers to silence GCC -Wall
        * lib/m4regex.c: fixes to silence GCC -Wall
        * modules/Makefile.am: don't use DLLDFLAGS, add INCLTDL to INCLUDES,
          build modules conditionally
        * modules/shadow.c: define symbol aliases before using them
        * modules/test.c: define symbol aliases before using them
        * po/de.po: update translation
        * src/Makefile.am: delete pathconf.h, set MODULE_PATH to
        pkglibexecdir, don't use DLLDFLAGS, add INCLTDL to INCLUDES and
        LIBLTDL to LIBS.
        * src/m4.c: initialize libltdl's preloaded symbols via
        LTDL_SET_PRELOADED_SYMBOLS
        * src/module.c: libltdl's memory management must be initialized
        before calling lt_dlinit!, fix warnings

2000-01-18  Gary V. Vaughan  <gary@gnu.org>

        * README:  Caveat about nls not supported by dll architecture on
        Windows.

        * TODO (MODULE SPECIFIC ISSUES): more ideas for the future.

        * tests/Makefile.am (stamp-TESTS):  now works with VPATH.
        * src/Makefile.am (m4_LDADD):  use $(builddir) for VPATH.
        * modules/Makefile.am (LIBS): ditto.
        (INCLUDES): search $(top_srcdir) (for eg. <m4/error.h>) and then
        $(top_srcdir)/m4 (for only <m4module.h>).
        * modules/shadow.test: fixed for VPATH.
        * modules/modtest.test: ditto.
        * modules/modpath4.test: ditto.
        * modules/modpath3.test: ditto.
        * modules/modpath2.test: ditto.
        * modules/modpath1.test: ditto.

        * modules/time.test: Removed due to timezone dependence,
        * modules/Makefile.am (TESTS): Removed time.test.

        * configure.in: Use $3 of AC_DEFINE so that we can,,,
        * acconfig.h: Remove everything except the gettext parameters.
        * acm4/gmp.m4: Add a serial number, and take advantage of $3 of
        AC_DEFINE.
        * acm4/ltdl.m4:  Updated to latest from libtool cvs.
        * acm4/modules.m4:  Remove code which duplicates ltdl.m4 and
        increment serial number.

        * Makefile.am (SUBDIRS): Moved @MODULES_DIR@ to compile before
        src dir and immediately after libm4 is built for confidence that
        it doesn't rely on the src directory.
        (SUBDIRS): Moved doc dir to the end since helptoman.pl and
        makeinfo stop the build on cygwin (because they don't work).

        * src/m4.h: use GNU standard #if HAVE_CONFIG_H ideom.

        * m4/m4private.h: ...is not a public header, so moved to src.
        Add `#include <config.h>', `#define _COMPILING_M4' and
        `#include "m4.h".
        * m4/Makefile.am (noinst_HEADERS): remove m4private.h.
        * src/Makefile.am (noinst_HEADERS): add m4private.h.
        * src/builtin.c: `#include "m4private.h"' now takes care of the
        above.  Duplicates removed.
        * src/debug.c: ditto.
        * src/eval.c: ditto.
        * src/evalmp.c: ditto.
        * src/format.c: ditto.
        * src/freeze.c: ditto.
        * src/input.c: ditto.
        * src/m4.c: ditto.
        * src/macro.c: ditto.
        * src/module.c: ditto.
        * src/numb.h: ditto.
        * src/output.c: ditto.
        * src/path.c: ditto.
        * stackovf.c: ditto.
        * symtab.c: ditto.

        * po/POTFILES.in: compensate for renaming of lib/*.
        * m4/Makefile.am (CLEANFILES): @EXEEXT@ left libtool wrapper behind.
        (INCLUDES): Look first in $(top_srcdir) (for eg. <m4/error.h>),
        and then in $(top_srcdir)/lib (for eg. "m4private.h").
        * src/Makefile.am (m4_LDADD): replace libi/libm4.la with
        m4/libm4.la.
        * m4/m4error.h:  Renamed error.h, for installation to
        $prefix/include/m4..
        * m4/m4obstack.h:  Renamed obstack.h, for same reason.
        * m4/m4regex.h: Renamed regex.h, for same reason.
        * m4/m4error.c:  Renamed error.c, and use #include "error.h".
        * m4/m4obstack.c: Renamed obstack.c, and fix #includes.
        * m4/m4regex.c: Renamed regex.c, and fix #includes.

        * lib: moved to m4 to easily support header installation to
        $prefix/include/m4.
        * Makefile.am (SUBDIRS): renamed lib dir to m4.
        * configure.in (AC_OUTPUT): reference m4/Makefile.in.
        * acm4/regex.m4: Point to m4/regex.c.

        * examples/foreach.m4:  Sanitise quoting.
        * examples/foreach.test:  New torture test.
        From Akim Demaille <akim@epita.fr>

2000-01-17  Gary V. Vaughan  <gary@gnu.org>

        * src/ltdl.c: Use access() to abort doomed module load attempts
        if module file does not exist.

        * src/Makefile.am (m4_SOURCES, EXTRA_SOURCES): getopt.o and
        getopt1.o will already be used if appropriate, so I moved getopt.c
        and getopt1.c from m4_SOURCES to EXTRA_SOURCES.

        * modules/modpath1.test: Use correct filename in header line.
        * modules/modpath2.test: ditto.
        * modules/modpath3.test: ditto.
        * modules/modpath4.test: ditto.

        Without these changes lt_dlopen("test") attempts to
        LoadLibrary("/bin/test") on Windows, which although harmless
        generates a spurious error message which spoils most of the tests:
        * modules/Makefile.am (EXTRA_DIST): s/test.m4 /modtest.m4 /
        (TESTS): s/test.test /modtest.test /
        (pkglibexec_LTLIBRARIES): s/test.la /modtest.la /
        (test_la_SOURCES, test_la_LDFLAGS): renamed to use modtest.
        * modules/modpath1.test: s/test.m4 /modtest.m4 /
        * modules/modpath2.test: ditto.
        * modules/modpath4.test: ditto.
        * modules/modpath3.test: s/-m test /-m modtest /
        * modules/shadow.m4: use {un,}loadmodule(`modtest').

2000-01-16  Gary V. Vaughan  <gary@gnu.org>

        * src/ltdl.c (find_file): Updated to new version with fixed memory
        allocation bug in `next'.
        * src/ltdl.h: updated to match.

        * modules/Makefile.am:  Cleaned up and reordered.

2000-01-16  René Seindal  <rene@seindal.dk>

        * modules/Makefile.am (TESTS): New tests for the module system.

        * modules/*.test: New files.

        * src/m4.c (main): Added call to module_init().
        Treats -M and -m as the arguments -D -U and -t, ie deferred.

        * src/m4.h: Added declaration of module_init().

        * src/module.c (module_init): No longer static

        * modules/Makefile.am ({test,shadow,time,stdlib}_la_LDFLAGS):
        Added to shut up automake about non standard libtool library
        names.

        * src/module.c: Disabled DEBUG by default.

        * modules/README: Changed example from unload.m4 to shadow.m4

        * modules/shadow.m4: Renamed from unload.m4

        * modules/Makefile.am (EXTRA_DIST): Removed unload.m4.

        * src/m4.c (main): Functionality for -m and -M were reversed.
        Fixed.

2000-01-12  Gary V. Vaughan  <gary@gnu.org>

        * doc/help2man.pl: updated to version 1.020.

        * lib/COPYING.LIB:  updated to version 2.1.

        * lib/m4module.h: restructure the M4_SCOPE code to work when
        creating a dll which links with libm4.la and both DLL_EXPORT
        (for the new dll) and LIBM4_DLL_IMPORT (for m4module.h) are
        both defined.

2000-01-11  Gary V. Vaughan  <gary@gnu.org>

        Merged the following changes from my tree:

        1999-06-15  Gary V. Vaughan  <gary@gnu.org>

        * configure.in (AC_LIBTOOL_WIN32_DLL): Declare that m4 has been
        ported to compile shared libs.

        * configure.in (LIBM4_DLL_IMPORT): Discover whether we need to
        use `__declspec(dllimport)' when linking libm4.la on win32.
        * src/Makefile.am (m4_LDFLAGS): Use dllimport if necessary.

        * configure.in (M4OBJS): Discover whether we need the shipped
        implementation of getopt_long.
        * src/Makefile.am (m4_LDADD): Link the getopt objects into the
        main binary here, as opposed to the module library in lib/libm4.la.

        1999-06-14  Gary V. Vaughan  <gary@gnu.org>

        * modules/README: Updated to describe the improved libltdl based
        module scheme.
        * README (cygwin): Added some compilation notes for building m4
        correctly under cygwin.
        * TODO: Cleaned out the entries for the module system since they
        are now implemented.

        * *.[ch]: __P is in the compiler's reserved namespace, so replaced
        all instances of __P with M4_PARAMS.

        * lib/getdate.h: removed unreferenced file.

        * lib/m4private.h: New file to define the private interface to the
        token_data struct, which must be shared between m4module.c, and
        builtin.c but not exported to modules built from the installed
        m4module.h since it's size changes depending on compile time
        options.

        * src/m4.h: Lots of stuff moved to lib/m4module.h.

        * lib/m4module.h: New file to define the interface available when
        compiling m4 modules.
        * lib/m4module.c: Moved parts of builtin.c, and m4.c which are
        necessary for module compilation into this new file.

        * lib/Makefile.am (include_HEADERS): install headers (renamed to
        avoid nameclash with other system headers) necessary for compiling
        modules.
        (libm4_la_SOURCES): always include error.c, obstack.c and regex.c
        so that modules can include the (renamed) installed headers and
        be guaranteed a matching implementation.
        * lib/m4error.h: renamed from error.h.
        * lib/m4obstack.h: renamed from obstack.h.
        * lib/m4regex.h: renamed from regex.h.
        * configure.in (AC_REPLACE_FUNCS):  Don't look for a system
        implementation, simply include the shipped version
        unconditionally, otherwise it is hard for a module to know
        whether the m4obstack.h header it is using matches the
        implementation it ends up linking against.
        (jm_WITH_REGEX):  Include regex into libm4 unconditionally for
        the same reason.

        1999-05-18  Gary V. Vaughan  <gary@gnu.org>

        * examples/misc.test: Don't run this test on machines which don't
        have a root user in /etc/passwd (e.g. cygwin).

        * tests/get-them (/^@example$/): Error messages might have a
        ``.exe'' suffix to the program name, or else use the libtool
        ``.libs/lt-m4'' binary, or generally have an unexpected path.  All
        of these cases are now catered for when comparing error messages
        in generated tests.
        * tests/other-tests/*.test: ditto.
        * examples/*.test: ditto.

        * tests/defs (M4): use libtool execute mode.
        * examples/defs (M4): ditto.

        * tests/get-them (END): explicitly close any open file.
        (printthem): In a regular expression, '{' is the start of a repeat
        count!  Use `[{]' for a literal open brace.
        (/^@node /): Don't use substr on a string shorter than the trim
        length.

        1999-05-17  Gary V. Vaughan  <gary@gnu.org>

        * configure.in (LTLIBOBJS): calculated from LIBOBJS, and
        substituted.
        (AC_LIBTOOL_DLOPEN): declare that this package will use dlopen.

2000-01-10  Andreas Schwab  <schwab@suse.de>

        * tests/other-tests/gmp.test: Find config.sh in build directory.

        * configure.in: Find tests/mkconfig.sh in $srcdir.

        * configure.in: Define HAVE_SIGINFO_T if siginfo_t is defined in
        <signal.h> (for SUS2 compliant systems).

        * src/stackovf.c: Check for HAVE_SIGINFO_T in addition to
        HAVE_SIGINFO_H.

2000-01-10  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4o.

        * TODO, NEWS: Cleaned up and updated.

        * src/m4.c (main): New variable exit_status for exit status in
        case of unreadable files.  Now m4 will exit with EXIT_FAILURE if a
        file cannot be read instead of EXIT_SUCCESS.

        * src/builtin.c (m4_indir): Changed error message to help
        translators (from Akim Demaille <demaille@inf.enst.fr>).

        * lib/obstack.[hc], getopt*.[ch]: Updated to newest version from
        Cygnus.

        * lib/error.[hc], lib/regex.[hc], lib/strtol.c: Updated to version
        from glic 2.1.2.

        * src/input.c (match_input): Reordering of code, to avoid multiple
        calls to push_string_init() from obstack_grow(), which can happen
        with some compilers (found and fixed by James Bonfield
        <jkb@mrc-lmb.cam.ac.uk>).

        * src/stackovf.c: Added prototypes for ultrix.
        (setup_stackovf_trap): Added __P to cast.
        (Both reported by John David Anglin <dave@hiauly1.hia.nrc.ca>)

2000-01-09  René Seindal  <rene@seindal.dk>

        * doc/m4.texinfo (Changequote): Added comment about changing
        quotes when the old quote is a part of the new.

        * src/builtin.c (expand_ranges): Added break after trailing dash.
        This caused misbehavious on some systems (found and fixed by Akim
        Demaille <demaille@inf.enst.fr>).

        * AUTHORS: Thomas Tanner included

        * acconfig.h: Added entry for ss_sp (see below).

        * configure.in (use_stackovf): Added check for stack_t with member
        ss_base instead of ss_sp (BSDI notably).  (Reported by Paul Eggert
        <eggert@twinsun.com>).

        * doc/m4.texinfo (Frozen files): Added a simpler example for
        generating frozen files from several input files.

1999-11-14  Paul Eggert  <eggert@twinsun.com>

        * po/POTFILES.in: Add lib/getopt.c, lib/obstack.c,
        lib/regex.c, lib/xmalloc.c.

1999-11-10  René Seindal  <rene@seindal.dk>

        * Makefile.am (ACLOCAL_AMFLAGS): Passes -I acm4 to aclocal.

        * src/module.c: reindented.
        (module_load): return if this is a repeated load of same module.
        (module_init): slight change of logic to avoid repeated
        initialisation debug messages.

        * Makefile.am (DIST_SUBDIRS): Added to ensure modules/ is included
        in the distribution.

        * modules/Makefile.am (test_la_LDFLAGS): set to -module to silence
        automake warnings about missing lib prefix.
        (time_la_LDFLAGS): ditto
        (stdlib_la_LDFLAGS): ditto

1999-11-10  Paul Eggert  <eggert@twinsun.com>

        * src/m4.h: Include error.h, since our macros use error.
        * src/m4.c: Don't need to include error.h.

1999-11-09  Paul Eggert  <eggert@twinsun.com>

        * src/m4.h (voidstar): Define to void * if __STDC__ is defined
        and zero, as Solaris 7 cc does.
        (bcopy): Remove macro; no longer needed with new obstack.h.

        * src/output.c (freeze_diversions): Don't assume that a
        diversion size can fit in `int'.  Check for diversion file
        size too large to be printed with `unsigned long'.

        * src/Makefile.am (CFLAGS): Omit -Wall.

        * src/stackovf.c (setup_stackovf_trap): Remove cast to unsigned.

        * src/debug.c (trace_format):
        Use ANSI C if (defined __STDC__ && __STDC__) || defined PROTOTYPES.

        * src/freeze.c (produce_frozen_state):
        Don't assume string lengths fit in int.

1999-10-13  René Seindal  <rene@seindal.dk>

        * po/cs.po: Czech translation added.

        * po/sv.po: Updated Swedish translation.

        * po/ru.po: Updated Russian translation.

        * po/pl.po: Updated Polish translation.

        * po/el.po: Greek translation added.

1999-10-13  René Seindal  <rene@seindal.dk>

        * configure.in (ALL_LINGUAS): Added Greek translation (el).
        (ALL_LINGUAS): Added Czech translation (cs).

1999-03-30  Gary V. Vaughan  <gary@gnu.org>

        * src/builtin.c: moved module loading functions into...
        * src/module.c: entirely new implementation using libltdl.
        * po/POTFILES.in: added src/module.c.
        * modules/Makefile.am (LTLIBRARIES): Removed lib prefix as these
        are modules, not linktime libraries.
        (LDFLAGS): added -no-undefined -module and -avoid-version flags.
        * modules/stdlib.c (m4_macro_table): use <name>_LTX collision
        avoidance on exported symbols.
        * modules/test.c (m4_macro_table, m4_init_module,
        m4_finish_module): ditto.
        * modules/time.c (m4_macro_table): ditto.

        * modules/time2.m4: new file which requires command line loading
        of modules.
        * src/m4.c (--load-module): dynamically load named runtime module
        into running executable before reading the source.
        (--module-directory): prepend a directory to the module search
        path.
        (module_init()): Do this the first time we load a module instead;
        if the module subsystem is broken normal m4 scripts can still run.
        * src/m4.h (install_builtin_table): is now exported.

1999-03-26  Gary V. Vaughan  <gary@gnu.org>

        * src/module.c: removed.  No longer required.
        * po/POTFILES.in: removed src/module.c.

        * Makefile.am (MAINTAINERCLEANFILES): Remove all the files that
        the bootstrap script can recreate.
        * acm4/Makefile.am (MAINTAINERCLEANFILES): ditto.
        * doc/Makefile.am (MAINTAINERCLEANFILES): ditto.
        * examples/Makefile.am (MAINTAINERCLEANFILES): ditto.
        * lib/Makefile.am (MAINTAINERCLEANFILES): ditto.
        (AUTOMAKE_OPTIONS): reduced strictness to allow COPYING.LIB.
        * modules/Makefile.am (MAINTAINERCLEANFILES): ditto.
        * src/Makefile.am (MAINTAINERCLEANFILES): ditto.
        * tests/Makefile.am (MAINTAINERCLEANFILES): ditto.

        * acinclude.m4: removed.  `aclocal -I acm4' handles this much
        better.
        * acm4/Makefile.am (ACINCLUDE_M4): ditto.
        * acm4/gettext.m4: removed.  It causes a multiple definition vs.
        the installed gettext.m4 file when running aclocal.

1999-03-25  Gary V. Vaughan  <gary@gnu.org>

        * configure.in (AM_INIT_AUTOMAKE): bumped version number to
        distinguish this from the last prerelease.
        (AC_LIBLTDL_CONVENIENCE):  build libltdl as a convenience library
        in its own subdirectory.

        * modules/Makefile.am (*_SOURCES): renamed to use libtool's "no
        lib prefix on a module" feature.
        (LDFLAGS): Added `-module -avoid-version' flags to build
        versionless module libraries.
        * src/builtin.c (m4_load_module): use libltdl.
        (module_unload_all): use libltdl.
        * src/m4.c (module_init): initialise module loading on demand for
        better diagnostics, and so that m4 will still work even if
        the module code is broken.
        * src/m4.h (module_init): removed.  No longer relevant.
        * modules/stdlib.c (m4_macro_table): use stdlib_LTX_ prefix on
        exported symbols for compatibility with dlpreopening.
        * modules/test.c (m4_macro_table, m4_init_module,
        m4_finish_module): ditto.
        * modules/time.c (m4_macro_table): ditto.

        * bootstrap: New file.  Runs all the autoutils in the right order
        after a fresh checkout, or a make maintainer-clean.

1999-02-18  Akim Demaille  <demaille@inf.enst.fr>

        * src/builtin.c (dump_symbols): New function, factoring common
        content of m4_dumpdef and m4_symbols.
        (m4_dumpdef): Use it.
        (m4_symbols): New function, implementing `symbols'.  Use it.
        * doc/m4.texinfo: Fixed missing commas after @xref, so that the
        file compile with modern makeinfo.
        (Symbols): New node, documenting symbols.
        (direntry): Modernize.

1998-12-11  René Seindal  <rene@seindal.dk>

        * src/builtin.c (predefined_tab): New predefined macros
        __m4_changeword__, __m4_gmp__ and __m4_modules__ for testing for
        configure time options.

1998-12-01  Andreas Schwab  <schwab@issan.cs.uni-dortmund.de>

        * src/module.c (module_try_load): Don't try to be clever and
        overwrite argument string.  Instead allocate all constructed
        strings locally, since they can have arbitrary lengths.  Make
        arguments pointers to const.
        (module_search): Simplify due to above change.

1998-11-29  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4n.

        * tests/Makefile.am (OTHER_TESTS, OTHER_FILES): New tests.

        * tests/other-tests/import-environment.{m4,test}: New test.

        * tests/other-tests/discard-comments.{m4,test}: New test.

        * doc/m4.texinfo (Invoking m4): Updated for --discard-comments.

        * src/m4.c (main): New option -c --discard-comments.
        New global variable discard_comments.

        * src/m4.h (token_type): New TOKEN_NONE for tokens to be
        discarded, ie never returned from next_token().
        Added declaration of discard_comments.

        * src/input.c (next_token): Now loops until token type is not
        TOKEN_NONE.  Comments are now given this type when comments should
        be discarded.

        * doc/m4.texinfo (Invoking m4): Updated for --import-environment
        and mpeval.

1998-11-28  René Seindal  <rene@seindal.dk>

        * src/m4.c (main): New option --import-environment (no single
        letter option).

        * When configured with --with-gmp both the normal (fast) eval()
        and the gmp aware mpeval() are defined.  To restore previous
        bahaviour use "define(`eval', defn(`mpeval'))".

        * tests/other-tests/gmp.m4: Changed to use mpeval().

        * src/evalmp.c: New file for compiling eval.c as gmp aware.
        Just defines USE_GMP if WITH_GMP is defined and includes eval.c.

        * src/eval.c: Now includes "numb.c" directly.  Everything in this
        file must by static, except evaluate(), which is changed to
        mp_evaluate() if USE_GMP in force.

        * src/numb.c: Changed to be included by eval.c instead of being
        compiled separately.  Everything is declared static.

        * src/numb.h: Removed declarations of functions, as numb.c is now
        included by eval.c.

        * src/builtin.c: Declaration of m4_mpeval() added.
        Inserted `mpeval' in builtin table.
        (do_eval): New function with common code for m4_eval and m4_mpeval.
        (m4_mpeval): New function for gmp version of eval.

        * src/m4.h: Declaration of mp_evaluate().

        * src/Makefile.am (m4_SOUCES): Includes mpeval.c.
        (EXTRA_m4_SOURCES): Now has numb.c and numb.h

        * src/m4.c (main): m4 --version also shows which options were used
        for compilation, such as: "GNU m4 1.4n (options: modules gmp)"

1998-11-27  René Seindal  <rene@seindal.dk>

        * Error messages now always print program name before input file
        name as specified by GNU coding standards.  Reported by Akim
        Demaille <demaille@inf.enst.fr>.

        * doc/m4.texinfo (Include): Change due to changed error message
        format.
        (Eval): Do.

        * tests/get-them: Minor change to sed script due to changed error
        message format.

        * src/m4.c (print_program_name): New func used to print program
        name, input file and line number in error ().  Used as an
        error_print_progname handler.
        (reference_error): Removed.
        (main): Assigns error_print_progname.

        * src/m4.h (M4ERROR): Removed reference_error ().

1998-11-25  René Seindal  <rene@seindal.dk>

        * Updated to libtool 1.2b.

        * src/builtin.c (install_builtin_table): Added braces to avoid
        warning of ambiguous 'else'.

        * src/module.c: Inserted search path code from path.c modified to
        use new interface.
        (module_init): Configured default path used only if M4MODPATH is
        not set.
        (module_try_load): Now reads libMODULE.la as generated by libtool
        for actual module name.
        (module_load): Gives better error messages on failure.

        * src/m4.h: Added declarations of structures and functions for
        generic search path handling.

        * src/path.c: Removed all module specific code and introduced new
        functions of more generic search path handling.

1998-11-24  René Seindal  <rene@seindal.dk>

        * configure.in: Defines INTLINCL to -I$(top_srcdir)/intl if using
        included gettext, as <libintl.h> might not be found
        otherwise. Reported by Andrew Bettison <andrewb@zip.com.au>.

1998-11-22  René Seindal  <rene@seindal.dk>

        * src/output.c (insert_diversion): Fixed bug that might cause m4
        to read from standard output!  Triggered by input
        'divert(1)undivert(0)'.  Test for divnum>0 changed to divnum>=0,
        so now 'undivert(0)' does nothing.

1998-11-18  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4m.

        * src/input.c (set_word_regexp): Fixed a bug, where word_regexp
        could be changed when compiling a illegal regexp, causing later
        use of the regexp to dump core.

        * src/module.c (module_load): Changed error message to conform to
        standards.

        * src/m4.c (usage): Added message about reporting bugs.

        * doc/m4.texinfo (Changeword): Corrected a wrong example.
        (Changeword): Added note about the type of regexps used.

        * ltconfig, ltmain.sh: New files from Libtool 1.2.

        * configure.in: Added calls to AM_ENABLE_SHARED, AM_DISABLE_STATIC
        and AM_PROG_LIBTOOL.

        * acm4/modules.m4 (AM_WITH_MODULES): Redone completely to work
        with libtool.

        * modules/Makefile.am: Changed completely to compile modules using
        libtool.  The modules are compiled as shared libraries, and are
        renamed when installed.

        * src/m4.h, src/module.c, acm4/modules.m4, acconfig.h: Renamed
        USE_SHL_LOAD to HAVE_SHL_LOAD

        * src/builtin.c (shipout_string): Now tests for a NULL string.

        * src/module.c: New level of indirection around non-portable
        functions to load shared objects.  Intended to encapsulate the non
        portable parts better and to reduce the number of #ifdefs in the
        code.

        * Makefile.am (DIST_SUBDIRS): Instead of EXTRA_DIST for added
        directory modules/ to the distribution.

1998-11-15  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4l.

        * modules/stdlib.c: New module `stdlib' defining some standard
        functions: getcwd, getlogin, getpid, getppid, getuid, getpwnam,
        getpwuid, hostname, rand, srand, getenv, setenv, unsetenv, uname.

        * src/builtin.c (shipout_string): New convenience function for
        builtins and modules.

        * src/module.c (module_load): Tentative support for
        shl_load/shl_findsym, but I cannot test it.  Copied from MetaHTML.

        * Makefile.am (SUBDIRS): Directory modules added if configured.

        * modules/Makefile.am: Now correctly compiles and installs
        modules in pkglibexecdir.

        * src/m4.h: WITH_MODULES defined iff HAVE_DLOPEN or USE_SHL_LOAD.
        These two are now initialised by autoconf macros.

        * src/path.c (module_env_init): MODULE_PATH is always on the
        search path.

        * src/Makefile.am: Now generated pathconf.h which defined the
        default MODULE_PATH.

        * configure.in (pkglibexecdir): Added defintion of pkglibexecdir,
        where modules are installed.

        * acm4/modules.m4: Enhanced with code from MetaHTML, contributed
        by Brian J. Fox <bfox@datawave.net>.  This change allow modules to
        build and install automatically, and it is prepared for other
        interfacec than dlopen().

        * src/builtin.c (predefined_tab): Added __m4_version__ for the
        current version of GNU m4.  It is a GNU extension.

1998-11-14  René Seindal  <rene@seindal.dk>

        * tests/Makefile.am (GENERATED_TESTS): Added new
        generated-tests/changesy.8.test

        * doc/m4.texinfo (Changesyntax): Documentation for escape
        syntax class.

        * src/macro.c (expand_token): Check for escaped macro call before
        symbol table lookup.

        * src/builtin.c (m4_changesyntax): Added `@' flag to define escape
        characters

        * src/input.c: New static variable use_macro_escape, which is TRUE
        iff some character has code SYNTAX_ESCAPE
        (input_init): Added initialisation of use_macro_escape.
        (check_use_macro_escape): New function to synchronise
        use_macro_escape with the syntax table.
        (set_quotes): Added call to check_use_macro_escape()
        (set_comment): Do.
        (set_syntax): Do.
        (next_token): Added new case for IS_ESCAPE.

        * src/m4.h (SYNTAX_ESCAPE): Defined as simple syntax category.

1998-10-13  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4k.

        * tests/Makefile.am (GENERATED_TESTS): Renamed gentest to
        generated-tests.

        * tests/Makefile.am (OTHER_TESTS, OTHER_FILES): Added manually
        maintained tests in tests/other-tests.  These currently tests for
        8-bit transparency, multiple precision arithmetic and sync-line
        output.  Test for stackoverflow detection does not work.

        * examples/Makefile.am (TESTS): Added tests for all example files.

        * examples/mktests.sh: New file.  Help program for creating test
        files.

        * tests/mkconfig.sh: New file to generate tests/config.m4 and
        tests/config.sh.  This is for tests of configure selectable
        features.  Picks up all set WITH_ and ENABLE_ veriables from
        config.h

        * src/path.c (path_search): Added argument 'char **expanded_name'
        to return the expanded name.

        * src/m4.h: Added 2nd argument to declaration of path_search().

        * src/m4.c (main): Added 2nd argument to path_search().

        * src/freeze.c (reload_frozen_state): Do.

        * src/builtin.c (m4_undivert): Do.
        (include): Do.

1998-10-11  René Seindal  <rene@seindal.dk>

        * acm4/Makefile.am (ACINCLUDES_M4): Added gmp.m4 and modules.m4

        * acm4/modules.m4: New file.  Defines AM_WITH_MODULES.

        * acm4/gmp.m4: New file.  Defines AM_WITH_GMP.

        * configure.in: Introduced AM_WITH_MODULES and AM_WITH_GMP.

        * AUTHORS, ChangeLog: Changed all dates to ISO 8601.

        * intl/: Updated to GNU gettext 0.10.35.

        * doc/m4.texinfo (Format): Documented that format is blind.

        * src/builtin.c (builtin_tab): Builtin format marked as blind.

1998-10-07  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4j.

        * tests/Makefile.am (GENERATED_TESTS): Changed .m4 extension to
        .test, as the files are no longer just m4 input.

        * tests/get-them (FILE): Changed .m4 extension to .test.

        * src/m4.h (token_type): New token type TOKEN_SPACE introduced.
        Otherwise quoted strings with leading whitespace first in a macro
        argument would be eliminated.

        * src/macro.c (expand_token): Handles new token type TOKEN_SPACE.
        (expand_argument): Do.

        * src/input.c (next_token): SPACE and NUM/OTHER characters are only
        grouped together iff both quote and comment strings are single
        character.  Otherwise they might include a comment/quote leader.
        (next_token): Returns new token type TOKEN_SPACE.

        * src/builtin.c (push_builtin_table): New function to push a
        builtin_table on the stack without installing its contents.
        (find_builtin_by_name): Added call to push_builtin_table() if
        reading frozen files.  Otherwise the builtins named in the frozen
        files could not be found.
        (install_builtin_table): Changed to use push_builtin_table()

1998-10-04  René Seindal  <rene@seindal.dk>

        * po/pl.po: Polish translation added.

        * po/POTFILES.in: src/module.c added.

1998-10-04  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4i.

        * configure.in (ALL_LINGUAS): Added Polish pl.po

1998-10-03  René Seindal  <rene@seindal.dk>

        * Many files: Incorporated changes to implement dynamic modules.
        Detailed comments in src/modules.c and modules/README

        * src/module.c: New file, implements the OS dependant parts of
        dynamic module loading.

        * src/Makefile.am (m4_SOURCES): Added module.c

        * src/builtin.h: New file, declares some functions from builtin.c
        that are of use for other modules (shipout_int, numeric_arg,
        skip_space, bad_argc), and the macros ARG() and DECLARE().

        * src/builtin.c (install_builtin_table): New function.  Each
        module brings in a builtin_table, which is pushed on a stack.
        (struct builtin_table): New struct for list of builtin_tables.
        (m4_loadmodule): New function to implement builtin "loadmodule".
        (shipout_int): No longer static, to be used by modules.
        (numeric_arg): do.
        (skip_space): do.
        (bad_argc): do.
        (builtin_init): changed to call install_builtin_table()
        (find_builtin_by_name): Now searches all builtin_tables
        (find_builtin_by_addr): do.

        * src/path.c: Reorganised to allow for two search paths, one for
        include files and one for modules.

        * src/m4.h: Added declarations for new functions in module.c and
        in path.c.

        * src/m4.c (main): Added call to module_init().

        * modules: New directory with a few demo modules.

        * Makefile.am (EXTRA_DIST): Added modules/* since modules/ is not
        in SUBDIRS.

        * configure.in: Added modules/Makefile to AC_OUTPUT.

        * configure.in: Added code to implement --with-modules.  Tests for
        <dlfcn.h> and -ldl.

        * acconfig.h: Added WITH_MODULES

1998-10-02  René Seindal  <rene@seindal.dk>

        * examples/Makefile.am (pkgdata_DATA): Removed special target for
        check and variables TESTS.  These tests are now run from the
        tests/ directory.

        * tests/Makefile.am (OTHER_TESTS): Added tests from the example/
        directory.  The files stay there but the tests are run from the
        tests/ directory.

        * tests/Makefile.am (EXTRA_DIST): Added run-test.

        * tests/run-test: New file.  Run a test manually

        * tests/Makefile.am, tests/get_them: Moved automatically generated
        tests (from the manual) to sub directory tests/gentest/.  The
        tests/ directory had gotten a bit messy.

1998-09-06  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * examples/{comments,ddivert,debug,iso8859,reverse,sysv-args,\
        wrap}.test: Added a few testcases.

1998-08-21  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * Prerelease 1.4h.

        * lib/Makefile.am (noinst_HEADERS): regex.h added

        * configure.in (jm_WITH_REGEX, jm_PREREQ_ERROR):
        acm4/{error,regex}.m4 (from fileutils-3.16u.tar.gz).

        * acm4/Makefile.am: created providing rules to create
        $(top_srcdir)/acinclude.m4 to be used by aclocal.

        * tests/defs (LANGUAGE, LC_ALL, LANG): force them to be
        `C'. Reported by Ulrich Drepper.

        * Makefile.am (SUBDIRS): Removed checks directory
        * configure.in (AC_OUTPUT): Removed checks/Makefile

        * doc/m4.texinfo (Patsubst,example): @comment added to preserve
        the space when m4.texinfo is edited and whitespace.el is active.
        (Defn,example): idem.

1998-08-20  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * doc/m4.texinfo (Esyscmd): grep ../Makefile instead of
        ../COPYING. ../Makefile is a file which is certainly present when
        test is executed in testSubDir. One can't be sure that the COPYING
        file is in .. or ../.. in all situations, the ../Makefile is
        always there.

        * doc/m4.texinfo (Include): adjusted expected test output
        according to new tests, i.e. the input will always come from the
        file `in' created by the test.

        * tests/Makefile.am: Added three lines at the top to get
        esyscmd.1.test working.

        * tests/get-them: modified to generate clearer tests who will need
        less maintenance when new test examples are created in
        `doc/m4.texinfo'. All tests are small (nearly stand-alone, they
        need the generic file `defs') shell scripts creating `in', `ok',
        `out' and when apropriate `okerr' and `err' in the directory
        `testSubDir' when executed. The compare of `ok' and `out'
        (and of `okerr' and `err') will be the exit status of the test.
        `out' must match `ok' (and `okerr' must match `err') for the test
        to be succesful.

        * tests/[a-b]\{1,8\}.[0-9]+.test: This namespace is reserved for
        the tests generated by tests/get-them getting it input normally
        from doc/m4.texinfo. The namespace tests/[a-b]+[0-9]+.test (no `.'
        (dot) before the numeric part) is reserved for all other (hand
        written) tests. The `+' means one or more times.

1998-08-12  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * doc/Makefile.am (EXTRA_DIST): helptoman.pl and $(MANS) to
        supported short man page to refer to info documentation
        * helptoman.pl: added
        * configure.in: AC_PATH_PROG(PERL,perl)
        * Makefile.am (SUBDIRS): doc after src

        * libitized with libit 0.5 from
        ftp://ftp.iro.umontreal.ca/pub/contrib/pinard/maintenance/libit.

        * configure.in (AC_REPLACE_FUNCS): added xmalloc xstrdup
        * lib/Makefile.am (libm4_a_SOURCES): removed automakely supported
         replacement functions, (libm4_a_LIBADD): @LIBOBJS@
        * configure.in (AM_WITH_REGEX), acconfig.h (WITH_REGEX): added
          lib/rx.{c,h}: added
        * configure.in (AC_CHECK_FUNC): getopt_long

        * src/m4.c (usage): Report bugs to m4-bugs@gnu.org.

        * TODO: added entry about dependencies

1998-08-10  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4f

        * doc/m4.texinfo (Changesyntax): Added documentation for the macro
        "changesyntax".

        * src/builtin.c (m4_changesyntax): Added builtin macro
        "changesyntax" to modify the syntax table.

        * src/input.c, src/m4.h, src/macro.c: Implemented an input syntax
        table.  All categories are assigned a syntax code and tokens are
        read according to this table.

1998-08-09  René Seindal  <rene@seindal.dk>

        * src/numb.{c,h}: New files, implements multiple precision eval
        using GNU gmp.  Originally submitted by John Gerard Makecki
        (johnm@vlibs.com), later modified.  Tested with GNU gmp 2.0.2.

        * doc/m4.texinfo (Eval): Added documentation for multiple
        precision arithmetic library support.

        * src/m4.{c,h}, src/eval.c, src/builtin.c, configure.in: Changes
        to accommodate multiple precision eval.

1998-08-07  René Seindal  <rene@seindal.dk>

        * src/input.c (MATCH, match_input), src/m4.h: changed definition
        of comment and quote strings to `unsigned int' to allow eight bit
        chars (reported by andrewb@zip.com.au (Andrew Bettison)).

        * src/builtin.c, doc/m4.texinfo: Builtin `syncoutput' added by
        patch from Mike Howard <mike@clove.com>

1998-08-06  René Seindal  <rene@seindal.dk>

        * gettext.m4: corrected AM_WITH_NLS to handle use of installed
        -lintl.

1998-08-03  René Seindal  <rene@seindal.dk>

        * Prerelease 1.4e

        * src/m4.h: Added ifdef ENABLE_NLS around include of <libintl.h>
        and _ macro.  M4 now builds with --disable-nls.

        * src/m4.c (main): reintroduced textdomain(PACKAGE) to get gettext
        to look for right message catalogs.  Call indef'ed by ENABLE_NLS.

        * configure.in (ALL_LINGUAS): Added complete list of translations:
        de fr it ja nl ru sv.

1998-05-23  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * po/nl.po: Dutch translation by Erick Branderhorst.

        * po/fr.po: French translation by Erick Branderhorst, based on the
        translations by François Pinard in fr.msg and m4.cod.

1998-05-22  Erick Branderhorst  <Erick.Branderhorst@asml.nl>

        * Prerelease 1.4d.

        * src/m4.c: #include <signal.h> not <sys/signal.h>.

        * src/Makefile.am: CFLAGS = -Wall @CFLAGS@.

        * checks/Makefile.am: explicit list tests in CHECKS.

        * configure.in, {,src,doc,lib,examples,checks}/Makefile.am,
        src/{ansi2knr.{1,c}} doc/{m4.texinfo,mdate-sh}, missing,
        mkinstalldirs, install-sh: Added automake (1.3) support.

        * lib/{alloca.c,error.{c,h},get{date.h,opt.{c,h},opt1.c},
        obstack.{c,h},regex.{c,h},strtol.c,xmalloc.c,xstrdup.c}:
        Used libitize (0.4) to update.

        * configure.in, ABOUT-NLS, intl/*, po/*: Added gettextize
        (0.10.25) support. Removed LOCALE, fr.msg, m4.cod and adjusted
        README accordingly.

        * src/stackovf.c: #ifdef USE_STACKOVF ... #endif to (de-)activate
        stack overflow functionality.

1994-12-03  François Pinard  <pinard@iro.umontreal.ca>

        * Prerelease 1.4.1.

        * Makefile.in (realclean-local): Delete stamp-h.in.

        * configure.in, {,src,lib}/Makefile.in, src/m4.h, src/m4.c:
        Localize, adapting from how it is done in sharutils.

        * fr.tt: New file, for French.

        * configure.in, {,*/}Makefile.in, acconfig.h, src/m4.c,
        src/freeze.c: Rename PRODUCT to PACKAGE.

1994-11-26  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Check for <libintl.h> and <locale.h>.
        * src/m4.h, src/builtin.c, src/debug.c, src/eval.c, src/macro.c,
        src/stackovf.c: Rename _ to __P.
        * src/m4.h: Declare _ as a macro returning its argument, or else,
        include <libintl.h> and declare _ as gettext.
        * src/m4.c: Possibly include <locale.h> and call setlocale.
        * src/m4.c, src/builtin.c, src/debug.c, src/eval.c, src/freeze.c,
        src/input.c, src/macro.c, src/output.c, src/path.c,
        src/stackovf.c, src/symtab.c: Use _ macro over all localizable
        strings.

1994-11-07  François Pinard  <pinard@iro.umontreal.ca>

        * doc/Makefile.in (stamp-vti): Use new -r option to date.

        * configure.in: Put --with-gmp in place, in prevision for John
        Gerard's work.
        * acconfig.h: Document WITH_GMP.

1994-11-05  François Pinard  <pinard@iro.umontreal.ca>

        * Release 1.4.

        * doc/Makefile.in (realclean): Also remove stamp-vti.
        Reported by Eric Backus.

1994-11-02  François Pinard  <pinard@iro.umontreal.ca>

        * src/freeze.c (produce_frozen_state): If the frozen file cannot
        be opened, return immediately after producing the error message.
        Reported by Andreas Schwab.

        * configure.in: Check for const only after having found possible
        ANSIfying compiler flags, this is of no use to check it before.
        Reported by Alexander Lehmann.

1994-11-01  François Pinard  <pinard@iro.umontreal.ca>

        * src/macro.c (collect_arguments): Cast obstack arguments to
        (voidstar), so avoiding compiler warnings.
        Reported by Joseph E. Sacco.

        * src/freeze.c (produce_frozen_state): Cast printed lengths to
        (int) so they correspond to %d format items.
        Reported by Joseph E. Sacco.

        * src/m4.c (main): Cast the argument to xfree to (voidstar).
        * src/symtab.c (free_symbol): Idem.
        Reported by Karl Vogel.

1994-10-31  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (DISTFILES): Distribute BACKLOG.

        * configure.in: Define PRODUCT and VERSION.
        * acconfig.h: Document PRODUCT and VERSION.
        * src/m4.c, src/freeze.c: Use PRODUCT and VERSION instead of the
        constant string m4 and variable or parameter named version.

1994-10-30  François Pinard  <pinard@iro.umontreal.ca>

        * src/m4.h, src/debug.c: Replace all #ifdef __STDC__ by #if
        __STDC__.  Alliant FX/2800 Concentrix 2.2 (i860-BSD4.3) compiler
        defines __STDC__ to 0, for indicating it is *not* ANSI!
        Reported by Kaveh R. Ghazi.

        * configure.in: Added obsolescent tests for AIX and Minix.

        * doc/Makefile.in (mostlyclean): Remove texclean in dependencies,
        which texclean does not exist anymore.
        Reported by Eric Backus, Jim Meyering, John David Anglin and
        Joseph E. Sacco.

1994-10-29  François Pinard  <pinard@iro.umontreal.ca>

        * aclocal.m4 (fp_C_PROTOTYPES): Force -D_HPUX_SOURCE with -Aa.
        Reported by John David Anglin.

        * src/ansi2knr.c: New version, sent by Peter Deutsch.
        * aclocal.m4 (fp_C_PROTOTYPES): Substitute empty or ansi2knr for
        ANSI2KNR, depending on the fact the compiler is ANSI or not.
        * src/Makefile.in: Use -Ovarargs=convert on ansi2knr calls.
        Remove the sed filter after ansi2knr for debug.c.  Use $O instead
        of $U, put underline in extensions rather than in basenames.  Use
        implicit rules, now that regularity makes this possible.
        Have $(OBJECTS) depend on $(ANSI2KNR), so to trigger compilation
        of ansi2knr whenever it is needed.
        * configure.in: Adjusted for correct STACKOVF substitution.
        * src/debug.c (trace_format): When not __STDC__, use (...) as a
        parameter list, so ansi2knr will convert it to (va_alist) va_dcl.
        Reported by David MacKenzie.

        * Makefile.in: Remove binprefix.  Use transform_name instead.
        Reported by David MacKenzie.

        * doc/Makefile.in: Create version.texi, use it, clean it.
        Reported by Jim Meyering.

1994-10-28  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (all, install, uninstall): Depend on Makefile.

        * Makefile.in: For actions invoking $(MAKE) from within compound
        sh statements, exit non-zero if the sub-make fails.  Otherwise,
        the top-level make may exit successfully when it should fail.
        Reported by Jim Kingdon.

        * {,/*}Makefile.in: Use && after all cd, in case they fail.

        * {,*/}Makefile.in: Declare PRODUCT and VERSION macros.
        (dist): Use PRODUCT and VERSION instead of tricks on .fname.
        * configure.in: Substitute PRODUCT and VERSION.

        * {,*/}Makefile.in (dist): Always try a hard link before a copy.

1994-10-27  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (mostlyclean-local): Do not remove *~.
        * */Makefile.in (mostlyclean): Idem.
        Reported by Robert E. Brown and Richard Stallman.

1994-10-09  François Pinard  <pinard@iro.umontreal.ca>

        * src/m4.h: Get rid of CONFIG_BROKETS.

1994-10-02  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Use AC_ARG_PROGRAM.
        * aclocal.m4 (fp_C_PROTOTYPES): Substitute @kr@ by kr or empty.
        Reported by David MacKenzie.

1994-10-01  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Do not add -O to CFLAGS for GNU C, now that
        configure does it automatically.
        Reported by Jim Meyering.

1994-09-23  François Pinard  <pinard@iro.umontreal.ca>

        * src/stackovf.c: Declare the handler_t typedef earlier in the
        code, use it for stackovf_handler.
        (setup_stackovf_trap): Use RETSIGTYPE instead of void while
        casting sigsegv_handler.
        Reported by Robert Bernstein.

        * src/m4.c (main): Initialize program_name to argv[0] without
        basename'ing it.
        Reported by Karl Berry.

1994-09-18  François Pinard  <pinard@iro.umontreal.ca>

        * src/Makefile.in (TAGS): Include a ../lib/TAGS reference.
        Reported by Karl Berry.

1994-09-14  François Pinard  <pinard@iro.umontreal.ca>

        * lib/Makefile.in (mostlyclean): Added.
        (TAGS): Make in $(srcdir).

        * configure.in: Use `choke me' in test, like everywhere!

        * {doc,examples,lib,src}/Makefile.in (check): Deleted, as
        unreacheable and useless.

        * doc/Makefile.in (texclean): Deleted, merged in mostlyclean.

        * lib/Makefile.in (DISTFILES): Distribute TAGS.
        (distclean): Do not remove TAGS.
        (realclean): Remove it.
        * Makefile.in: Make TAGS in lib also, not just in src.
        Reported by Karl Berry.

        * Makefile.in (distclean, realclean): Instead of recursively
        calling $(MAKE) for the -local part, allow parallel execution of
        -recursive and -local, only delay the removal of config.status,
        which is repeated in both goals.
\f
1994-09-13  François Pinard  <pinard@iro.umontreal.ca>

        * Release 1.3.

        * Makefile.in: Group all *clean-recursive goals in one, using sed
        to remove `-recursive' while calling make recursively.  Also, use
        a subshell for each recursive $(MAKE).
        Reported by Jim Meyering.

        * src/m4.h (memcpy): Define with bcopy for BSD systems.
        Reported by Kaveh R. Ghazi.

        * src/Makefile.in (ansi2knr): Use $(LIBS) while linking, for SunOS
        4.1.3 requires -ldl to link even ansik2nr, and we need a way to
        specify it.

        * configure.in: Use date instead of touch for stamp-h.
        * Makefile.in (stamp-h.in): Idem.

        * Makefile.in (distclean, realclean): Force serial execution of
        both goals, in case parallel makes are being used.
        Reported by Jim Meyering.

        * src/Makefile.in (DISTFILES): Distribute TAGS.
        (distclean): Do not remove TAGS.
        (realclean): Remove it.
        Reported by Karl Berry.

1994-09-10  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Use fp_ to match aclocal.m4.  Revert _OS_ macros
        to old names, for following Autoconf.

1994-09-08  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (MDEFINES): Remove INSTALL substitutions, for
        ./install.sh will not be correctly referred to in sub-Makefiles.
        Reported by John David Anglin.

        * doc/Makefile.in (texclean): Remove *.cps and *.fns too.
        Reported by Eric Backus.

        * Makefile.in, checks/Makefile.in, doc/Makefile.in,
        examples/Makefile.in, lib/Makefile.in, src/Makefile.in: Limit
        config.status into remaking this directory's Makefile only.
        * Makefile.in (stamp-h): Do not check nor touch stamp-h.
        * configure.in (AC_OUTPUT): Touch stamp-h if CONFIG_HEADERS.
        Reported by Jim Meyering.

1994-09-06  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Correct stack overflow detection logic, taking
        care of systems having only incomplete implementations (like for
        Pyramid 9820 OSx 5.0d).
        Reported by Kaveh R. Ghazi.

        * src/Makefile.in (TAGS): Remote -t from etags call.

1994-09-02  François Pinard  <pinard@iro.umontreal.ca>

        * lib/Makefile.in (install): Depend on all.

1994-08-31  François Pinard  <pinard@iro.umontreal.ca>

        * examples/Makefile.in (mostlyclean): Do not depend on texclean.
        Reported by Jim Meyering and John David Anglin.

        * Makefile.in (distclean-local): Delete config.log.
        Reported by Jim Meyering.

        Solidify frozen files with respect to -P:
        * src/m4.c: Have -P set prefix_all_buitins variable instead of
        calling a function by that name.  Declare the variable.
        * src/m4.h: Adjust declaration for prefix_all_buitins.
        * src/builtin.c (builtin_init): Merge in functionality from
        previous prefix_all_buitins function, while making entries in the
        symbol table, but not modifying the builtin description itself.

        * src/freeze.c (reload_frozen_state): Add a useless `break;',
        because *many* compilers do not accept an empty `default:'.
        Reported by Akiko Matsushita, Eric Backus, John David Anglin,
        Joseph E. Sacco, Kaveh R. Ghazi, Tom McConnell and Ulrich Drepper.

        * configure.in: Use AC_TYPE_SIGNAL.
        * src/stackovf.c (setup_stackovf_trap): Use RETSIGTYPE.
        Reported by Robert Bernstein.

        * checks/Makefile.in (check): Modify PATH so check-them will find
        m4 in the src directory.
        * Makefile.in (check): Don't.
        Reported by Akiko Matsushita and Jim Meyering.

        * src/output.c (make_room_for, output_character_helper): New
        functions, for implementing a global MAXIMUM_TOTAL_SIZE instead of
        a per buffer MAXIMUM_BUFFER_SIZE.

        * src/output.c (output_text): New function, for optimizing the
        output of strings of characters.  Use it.

1994-08-30  François Pinard  <pinard@iro.umontreal.ca>

        * doc, src: New directories reorganizing the distribution.
        * doc/Makefile.in, src/Makefile.in, examples/Makefile.in: New
        files.
        * Makefile.in: Adjusted.
        * configure.in: Configure new Makefiles.

        * m4.h: Declare STRING typedef.  Use it for comment and quote
        strings, adjusting all references.  (This is the rudiments of a
        beginning for the eventual withdrawal of NUL terminated strings.)
        * output.c (shipout_text): Accept a length parameter, and use it.
        All callers adjusted.

1994-08-29  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Include <unistd.h> if it exists.
        * stackovf.c: Don't.

        Clean up for current_diversion variable:
        * output.c: Move current_diversion from builtin.c.
        * m4.h: Declare current_diversion so builtin.c can access it.
        * output.c (output_init, make_diversion): Initialize or update
        current_diversion.
        * builtin.c (builtin_init, m4_divert): Leave current_diversion
        alone.

        Remove limit on number of diversions:
        * output.c: Replace ndiversion by diversions, declare it.
        (output_init): Allocate only diversion 0.
        (make_diversion): Allocate new diversions as needed.
        * m4.h, m4.c: Remove NDIVERSIONS and ndiversion related stuff.
        * m4.c: Still accept -N, but do nothing with it.
        Reported by David MacKenzie.

        Freeze diversions:
        * output.c (freeze_diversions): New function.
        * m4.h: Declare freeze_diversions.
        * freeze.c: Document frozen file format, revise it, call
        freeze_diversions to add diversions to frozen format, and code to
        reload them properly.
        * m4.c: Do not undivert automatically at end when status being
        frozen.  Do not call builtin_init when reloading frozen state.

        Speed up diversion processing:
        * output.c: Add INITIAL_BUFFER_SIZE, MAXIMUM_BUFFER_SIZE,
        COPY_BUFFER_SIZE, in-memory diversion buffers, struct diversion
        structure and variables, cached variables out of output_diversion,
        reallocate_diversion_for and OUTPUT_CHARACTER.
        (shipout_text, make_diversion, insert_diversion): Adapted to new
        structures.
        (insert_file): Use better buffering.
        Reported by David MacKenzie.

1994-08-28  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in, lib/Makefile.in, checks/Makefile.in: Arrange so
        dist works from another build directory.

1994-08-27  François Pinard  <pinard@iro.umontreal.ca>

        * symtab.c (hack_all_symbols): Use hash_table_size instead of
        constant HASHMAX, for -H option to work better.

        * builtin.c (DECLARE): Simplify by using _ ().

        * freeze.c: New file.
        * Makefile.in: Compile it, distribute it.
        * m4.c: Recognize, document and process --freeze-state (-F) and
        --reload-state (-R) options.  Pass a true flag to builtin_init
        only if no reloading some state.
        * builtin.c (define_builtin): Remove static specifier.
        (find_builtin_by_name): Remove static specifier.
        (builtin_init): Accept and obey a flag argument.
        * m4.h: Add declarations for freeze.c, changes for builtin.c.

1994-08-24  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c (dumpdef_cmp): Rewrite so the cast protect the const
        specifier.

        * configure.in: Implement --with-dmalloc.
        * acconfig.h: Document WITH_DMALLOC.
        * m4.h: Add code for when WITH_DMALLOC.

1994-08-15  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c (long_options): Use "error-output", the dash was missing.
        Reported by Akiko Matsushita.

1994-08-12  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Include <sys/types.h>.
        * builtin.c, debug.c, m4.c, output.c, stackovf.c: Don't.
        * m4.h: Declare len_lquote and len_rquote as size_t, not int.
        int.
        * input.c: Declare len_lquote, len_rquote, len_bcomm and len_ecomm
        as size_t, not int.
        * builtin.c (dump_args): Declare len as size_t, not int.

        * debug.c: Prototype the forward declaration of debug_set_file.

        * builtin.c (m4_undivert):  Replace div by file, for avoiding the
        shadowing of this variable.
        * output.c (insert_diversion): Idem.

        * input.c: Delete def_rquote, def_lquote, def_bcomm and def_ecomm.
        (input_init): Duplicate default quote and comment strings.
        (set_quotes): Free previous quote strings in all cases.  Duplicate
        even default quote strings.
        (set_comment): Free previous comment strings in all cases.
        Duplicate even default comment strings.

        * configure.in: Updated for Autoconf 2.0.
        * Makefile.in (distclean-local): Also delete config.cache.

        * m4.c (usage): Reorganize the --help output by topic.  Include a
        description for debugging flags.

1994-07-29  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: If sigaction is available and SA_ONSTACK defined,
        use sigaction.  Otherwise, if sigvec is available and SV_ONSTACK
        defined, use sigvec.  Else don't compile stackovf.c.
        * stackovf.c (setup_stackovf_trap): Idem.
        Reported by Jim Avera, Karl Berry, Kaveh R. Ghazi, Matthias Rabe
        and Simon Leinen.

1994-07-21  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c (usage): Replace printf par fputs.
\f
1994-07-18  François Pinard  <pinard@iro.umontreal.ca>

        * Release 1.2

1994-07-17  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Check for sigaction and sigvec.  Add a new delayed
        check for RLIMIT_STACK, combine in the checking for getrlimit.
        All those things are not universally available.
        * stackovf.c: Split setting up the trap handler and catching
        signals, for better taking care of various configure outcomes.
        * examples/stackovf.sh: Correct a typo.
        Reported by Eric Backus, Jim Avera and Jim Meyering.

1994-07-16  François Pinard  <pinard@iro.umontreal.ca>

        * ansi2knr.c: New version sent by its author, Peter Deutsch.

1994-07-15  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Modify so parallel make will not try making
        lib/libm4.a twice simultaneously.
        Reported by Jim Meyering.

1994-07-14  François Pinard  <pinard@iro.umontreal.ca>

        * stackovf.c (setup_stackovf_trap): Replace "Don't" by "Do not" in
        error message, for when no code possibility exists.  Even if this
        line is completely #ifdef'ed out, it brings a syntax error.
        Reported by Andreas Schwab, Jim Meyering and Joseph E. Sacco.

        * Makefile.in (install): Have install depend on all too, for lib
        to be remade as needed.

        * examples/stackovf.sh: Try ksh, bsh and bash for shells
        providing ulimit, instead of using only ksh.
        Reported by Jim Avera and Joseph E. Sacco.

1994-07-12  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (check): Have it depend on all instead of m4.  In
        this way, a change in lib will be detected and processed.

        * builtin.c (numeric_arg): Use strtol and verify the conversion,
        instead of using sscanf which stops as soon as there is a
        non-digit in the input.  Previously, incr(1xyzzy), eval(1,2xyzzy)
        and divert(1xyzzy) were all accepted without any warning or error
        messages.
        * m4.h: Declare strtol as long if not including stdlib.h.
        * configure.in: Check for limits.h, and replace strtol if missing.
        * lib/Makefile.in: Substitute LIBOBJS.  Distribute strtol.c.
        * lib/strtol.c: New file, from elsewhere.
        Reported by Andreas Schwab.

1994-07-07  François Pinard  <pinard@iro.umontreal.ca>

        * macro.c (expand_macro): Cast value to (boolean) prior to
        assigning it to traced.
        Reported by Tom McConnell.

        * Makefile.in (m4): Always make all in lib first.
        Reported by Jim Meyering.

1994-07-06  Jim Avera <jima@netcom.com>

        * stackovf.c: Isolated OS-dependent sections; Improved portability,
        adding support for SunOS/BSD (sigvec, sigstack, and 4-parameter signal
        handlers), and a default error message if the fault address is not
        available (when neither siginfo.h nor BSD sigcontext are supported).
        * configure.in: Changes for stackovf.h: Check for sigcontext,
        sigaction, sigstack, and define rlim_t as int if necessary.
        * acconfig.h: Added HAVE_SIGCONTEXT and rlim_t.
        * examples/stackovf.sh: Run m4 -L99999999 to allow stack overflow.
        * ansi2knr.c: Fix for func-ptr args; convert "..." to varargs syntax.

1994-07-05  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Use AC_SET_MAKE.
        * Makefile.in: Use @SET_MAKE@.
        Reported by Jim Meyering.

        * checks/check-them: Do not trap on SIGQUIT or SIGALRM.
        Reported by Ian Taylor.

1994-07-02  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Remove dependency of USE_STACKOVF on STDC_HEADERS,
        because siginfo.h is unrelated to standard headers, and siginfo.h
        is already checked for.
        Reported by Joseph E. Sacco.

        * acconfig.h, aclocal.m4, m4.h: Replace HAVE_PROTOTYPES by
        PROTOTYPES.
        * aclocal.m4, configure.in: Replace AC_HAVE_PROTOTYPES by
        AC_PROTOTYPES.

1994-06-29  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c (substitute): Use \& to represent this part of the
        string which was matched by the whole regexp, instead of
        representing the whole string.  Any usage of \0 issues a warning
        and acts like \&, it will disappear in some subsequent release.

1994-06-27  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c: Complete prototype for forwarded declaration of usage.

        * input.c (init_macro_token): Correct own reference in error
        message.  Previous name get_macro_func was referred to instead.
        (next_char):  Correct own reference in error message.  Previous
        name advance_input was referred to instead.

        * m4.h: Declare eval_t and unsigned_eval_t typedefs to 32 bits.
        * eval.c (logical_or_term, logical_and_term, or_term, xor_term,
        and_term, not_term, logical_not_term, cmp_term, shift_term,
        add_term, mult_term, exp_term, unary_term, simple_term): Add
        prototype to forwarded declarations.  Declare parameter v1 as
        eval_t * instead of int *.  Same for local variable v2 in dyadic
        functions.  Same for result in exp_term.
        * builtin.c (m4_eval): Declare value as eval_t instead of int.
        (ntoa): Declare value as eval_t instead of int.  Declare uvalue as
        unsigned_eval_t instead of unsigned int.  Change casts accordingly.
        (shipout_int): Cast first argument of ntoa to eval_t.
        Reported by Thorsten Ohl.

        * macro.c: Complete the prototypes of forwarded expand_macro and
        expand_token.
        Reported by Thorsten Ohl.

        * m4.h: Define voidstar as void * or char * depending on __STDC__.
        The Ultrix 3.1 compiler cannot do much with void pointers.

        * builtin.c (dumpdef_cmp): Replace void * by voidstar.
        * m4.c (xfree):  Replace void * by voidstar.
        Reported by Tom McConnell.

        * ansi2knr.1: New, from elsewhere.
        * Makefile.in (DISTFILES): Distribute ansi2knr.1

        * Makefile.in (stamp-h.in): Avoid running ./config.status if
        stamp-h does not exist yet.  This avoids running it a second time
        just after the initial ./configure.
        Reported by David MacKenzie and Tom McConnell.

        * m4.h: Replace the enum debug_info declaration with a series of
        #define's.  The Ultrix 3.1 compiler would otherwise need casting
        (int) to most references, when used in expressions.
        Reported by Tom McConnell.

1994-06-25  François Pinard  <pinard@iro.umontreal.ca>

        * aclocal.m4: Replace FP_PROTOTYPES by AC_HAVE_PROTOTYPES,
        following an idea from Brook G. Milligan.  AC_HAVE_PROTOTYPES
        calls the compiler.  Previously, FP_PROTOTYPES was only calling
        the preprocessor; by not being subject to CFLAGS, this was
        discouraging those flags asking for ANSI compilation.
        * acconfig.h: Document HAVE_PROTOTYPES.
        * configure.in: Use AC_HAVE_PROTOTYPES instead of FP_PROTOTYPES.
        * m4.h: Define _() according to HAVE_PROTOTYPES, not __STDC__.
        Reported by Eric Backus.

        * configure.in: Substitute CFLAGS and LDFLAGS, taking their value
        from the environment.  Default CFLAGS to -g if not set.
        * Makefile.in: Have CFLAGS and LDFLAGS substituted from configure.
        * lib/Makefile.in: Have CFLAGS substituted from configure.
        Reported by Eric Backus and Tom McConnell.

        * configure.in: m4_undefine changeword before using AC_ENABLE.

        * m4.h: Declare prototypes for error (for ANSI compilers only),
        prefix_all_builtins and reference_error.
        Reported by Tom McConnell.

        * input.c (set_word_regexp): Do not try to initialize the array
        test from a string, this does not work with non-ANSI compilers.
        Reported by Eric Backus.

        * Makefile.in (dist): Clean examples/ before saving it.
        (distclean-local): Also remove stamp-h.
        Reported by Eric Backus.

        * Makefile.in (_stackovf.c): Goal for compiling stacokovf.c with
        non ANSI compilers.
        Reported by Tom McConnell.

        * checks/Makefile.in (clean): Depends on mostlyclean.
        (mostlyclean): New goal.

1994-06-24  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (DISTFILES): Distribute install.sh.
        * install.sh: New file, copied from elsewhere.
        Reported by Assar Westerlund and Kaveh R. Ghazi.

1994-06-23  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Define ENABLE_CHANGEWORD if --enable-changeword.
        * acconfig.h: Explain ENABLE_CHANGEWORD.

        [These modifs all depend upon ENABLE_CHANGEWORD and are adapted
        from code provided by Pete Chown]
        * m4.h: Add original_text field to u_t variant of union u.
        Declare TOKEN_DATA_FUNC macro.
        * builtin.c: Declare changeword.
        (m4_changeword): New function.
        * input.c: Include "regex.h", define variables with word regexps.
        (input_init): Initialize the word regexp.
        (set_word_regexp): New.
        (next_token): Declare local variables, use the previous code if
        default_word_regexp is true.  Else, match using a new code.  Save
        the original text.
        * macro.c (expand_token): Ship out original text if not a macro
        name.
        Reported by Krste Asanovic and Pete Chown.

        [These modifs all depend upon ENABLE_CHANGEWORD]
        * m4.h: Declare external user_word_regexp.
        * m4.c: Declare user_word_regexp, and initialize it from
        --word-regexp or -W, or NULL if not specified.
        * input.c: Use user_word_regexp if specified, instead of
        DEFAULT_WORD_REGEXP.

        * Makefile.in (m4): Revert Jan 3 1994 change.  I'm unable to
        agree with it.

        * Makefile.in, lib/Makefile.in: Limit suffixes to .c and .o.
        * checks/Makefile.in: Empty the suffix list.
        Reported by Geoff Russell, Joel Sherrill and Roland McGrath.

        * m4.c: Declare nesting_limit and initialize it to 250.
        Implement -LNUMBER or --nesting-limit=NUMBER to change its
        value.
        * m4.h: Declare nesting_limit as external.
        * macro.c (expand_macro): Stop execution whenever nesting limit
        is exceeded.
        Reported by Bengt Mertensson.

        * eval.c (evaluate): Diagnose excess characters in eval input.
        Things like `eval(08)' used to return 0 with no diagnostic.

        * m4.h: Capitalize first letter of all macro arguments in
        definitions.

        * m4.c: Declare warning_status, initialize it to 0.  Add new
        option -E, or --fatal-warnings, which sets warning_status to
        EXIT_FAILURE instead.
        * m4.h: Declare external warning_status.  Define EXIT_SUCCESS and
        EXIT_FAILURE if not otherwise done by header files.
        * m4.c: Delete declarations for EXIT_SUCCESS and EXIT_FAILURE.
        * m4.c, input.c, output.c, symtab.c, builtin.c, macro.c, debug.c,
        eval.c: Replace 0 by warning_status and 1 by EXIT_FAILURE in first
        argument of all M4ERROR calls.
        Reported by Noah Friedman.

        * examples/incl-test.m4: Renamed from incl_test.m4.
        * examples/include.m4: Include incl-test.m4 instead of
        incl_test.m4.
        * examples/multiquotes.m4: Renamed from multi-quotes.m.

1994-06-22  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Avoid USE_STACKOVF if <siginfo.h> not found.  Note
        that Jim developped stackovf.c on a 486 running SVR4.0 (ESIX), and
        also tested it on a Sun Sparc workstation running SunOS 4.x.

        * format.c (format): When not HAVE_EFGCVT, m4 was failing the
        49.format check, abusing a `union values' argument with sprintf
        without selecting the proper field.  Now, save the formatting type
        first, delaying the fetch of the corresponding argument.
        Reported by Joseph E. Sacco and Tom Quinn.

        * format.c (format): Remove const from char *fmt declaration when
        not HAVE_EFGCVT, because a NUL may be forced into it.

        * m4.h: Declare atof() when not STDC_HEADERS.
        Reported by Joseph E. Sacco.

        * Regenerate configure using Autoconf 1.11, this corrects a
        problem about an incorrect cpp seting on NeXT 3.1.
        Reported by Alexander Lehmann.

1994-06-05  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h (_): Change argument from `x' to `Args'.

1994-04-22  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Rename Args() to _().
        * m4.h: Remove extern specifier from all function declarations.

1994-04-22  Jim Avera <jima@netcom.com>

        * stackovf.c: New file implementing stack-overflow detection.
        * configure.in: Check for getrlimit, sigaction.  If all of
        standard headers, getrlimit and sigaction, define USE_STACKOVF and
        substitute ${U}stackovf.o for STACKOVF.
        * acconfig.h: Declare USE_STACKOVF.
        * Makefile.in: Distribute stackovf.c, link with $(STACKOVF).
        * m4.h: Declare setup_stackovf_trap().
        * m4.c: Call setup_stackovf_trap().
        * tests/stackovf_test.sh: New file.

1994-04-13  François Pinard  <pinard@iro.umontreal.ca>

        * checks/Makefile.in: Rename .all-stamp to stamp-checks.

        * Makefile.in (Makefile, etc.): Adapt for Autoconf 1.8.

1994-01-30  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Remove definition of volatile, not used anymore.
        Reported by Jim Meyering and Joseph E. Sacco.

        * m4.h: Consistently use `do { ... } while (0)' in macros, instead
        of `if ... else /* nothing */' for if macros.
        Reported by Jim Meyering.

        * builtin.c (m4_regexp): Reorganize the code for avoiding a
        warning from gcc about `repl' possibly used before defined.
        Reported by Jim Meyering.

        * m4.h: Avoid a pre-ANSI <memory.h> together with <string.h>.
        Reported by Jim Meyering.

1994-01-25  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Move the conditional definition of volatile after the
        inclusion of system files, because they may define it first.

1994-01-04  François Pinard  <pinard@iro.umontreal.ca>

        * checks/Makefile.in (CHECKS): Add a useless `*' before `[', to
        get around a problem with Alpha make seeing a syntax error, there.
        Reported by Vern Paxson.

1994-01-03  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Do not define LDFLAGS, use CFLAGS on link calls.
        Reported by Richard Stallman.

1993-12-25  François Pinard  <pinard@iro.umontreal.ca>

        * configure.in: Correct test for strerror, AC_FUNC_CHECK was used
        instead of AC_HAVE_FUNCS.
        Reported by Noah Friedman.

1993-12-01  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c: Initialize show_help and show_version to zero.

        * m4.c: Ensure EXIT_SUCCESS and EXIT_FAILURE are defined.
        Use them in exit() and usage() calls.

1993-11-27  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Delete extern sys_nerr, sys_errlist declarations, and
        syserr() macro.  Delete errref, add reference_error and M4ERROR.
        * m4.c: Replace errref, which was returning an input reference
        string, with reference_error, which prints it on standard error.
        * builtin.c, output.c: Use errno as second parameter to error,
        instead of using syserr() with %s.
        * *.c: Use M4ERROR instead of error: no more errref() with %s.
        Doing so, the program name appears after the input reference
        instead of before, which eases M-x next-error processing.

1993-11-24  François Pinard  <pinard@iro.umontreal.ca>

        * checks/get-them: Escape braces with backslashes in patterns,
        because HPUX-9.01 awk needs this.
        Reported by Jim Meyering.

1993-11-22  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c: Declare "FILE *popen ();".

        * m4.h: Remove MESSAGE{,1,2}, WARNING1, FATAL{,1}, INTERNAL_ERROR
        macros, replace error_message_prefix() declaration by errref()'s.
        Declare xrealloc, for use in errref().
        * m4.c: Delete error_message_prefix() function, add errref().
        * *.c: Use error() systematically in place of all error macros,
        now that error() flushes stdout first.  Make needed adjustments.

        * m4.h: Remove const in sys_errlist[] declaration, it creates
        conflicts on SGI and Alpha.
        Reported by Kaveh R. Ghazi.

1993-11-20  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c: Include <getopt.h> instead of "getopt.h".

        * configure.in: Output to config.h.  Use HAVE_FUNCS preferably.
        * acconfig.h: New, for documenting HAVE_EFGCVT.
        * Makefile.in: Distribute acconfig.h, .stamp-h.in and config.h.in,
        use them wherever appropriate.  Also use -I. for compilations.
        * lib/Makefile.in: Use -I.. for compilations.
        * *.c: Include <config.h> or "config.h".

        * m4.h: Test for HAVE_MEMORY_H instead of NEED_MEMORY_H.
        * configure.in: Use AC_HAVE_HEADERS(memory.h), delete AC_MEMORY_H.

1993-11-17  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c (m4_eval): Cast strlen to (int) before comparing.

        * input.c (input_init): Initialize quote and comment strings
        explicitely instead of calling set_quotes and set_comment: by
        doing so, we ensure we do not free uninitialized variables.

        * checks/check-them: Reverse arguments to both diff, so the
        expected is on the left and the obtained on the right.

        * m4.h: Add MESSAGE{,1,2}, WARNING1, FATAL{,1} and INTERNAL_ERROR
        macros. Delete declarations for m4error, warning, fatal and
        internal_error, add declaration for error_message_prefix.
        * m4.c:  Delete m4error, warning, fatal and internal_error
        routines, add error_message_prefix routine.
        * *.c: Replace m4error routine calls with MESSAGE* macro calls,
        warning with WARNING*, fatal with FATAL* and internal_error with
        INTERNAL_ERROR*.
        * Makefile.in (_m4.c): Do not adjust ansi2knr output for va_alist,
        this is not needed anymore.

        * m4.h: Declare extern FILE *debug.  Add DEBUG_PRINT{1,3} and
        DEBUG_MESSAGE{,1,2} macros.  Delete declarations for debug_print
        and debug_message, add declaration for debug_message_prefix.
        * debug.c: Remove static specifier for FILE *debug declaration.
        Delete debug_print and debug_message routines, add
        debug_message_prefix routine.
        * builtin.c, debug.c: Replace debug_print routine calls with
        DEBUG_PRINT* macro calls.
        * input.c, path.c: Replace debug_message routine calls with
        DEBUG_MESSAGE* macro calls.

        * m4.h: Remove inclusion of <varargs.h>.
        * debug.c: Include <stdarg.h> or <varargs.h>.
        (trace_format): Use stdarg instead of varargs if __STDC__.

        * configure.in: Remove checks for vfprintf and _doprnt.  These
        implementations use varargs tricks which are not portable enough.
        * lib/vfprintf.c: Deleted.
        * lib/_doprnt.c: Deleted.
        * lib/Makefile.in: Adjusted accordingly.  Remove LIBOBJS.
        Reported by Joel Sherrill.

        * path.c (add_include_directory): Use xstrdup.

        * builtin.c (find_builtin_by_name): Declare static.

        * *.[ch]: Add const to a few "char *" declarations.

        * configure.in: Remove commented tests for fileno() and fstat().
        * debug.c: Remove comments about HAVE_FILENO and HAVE_FSTAT.

        * debug.c (debug_flush_files): New.
        * m4.h: Declares it.
        * builtin.c (m4_syscmd, m4_esyscmd): Use it.
        Reported by Nicolas Pioch.

1993-11-12  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (m4.dvi): Use m4.texinfo instead of m4.texi.
        Reported by Joel Sherrill.

        * builtin.c (prefix_all_builtins): Instead of the table size, use
        the null entry at end for stopping the loop.  It was overwritten.
        Reported by Andreas Schwab and Jim Meyering.

        * builtin.c (prefix_all_builtins): Cast xmalloc to (char *).
        Reported by Kaveh R. Ghazi.

        * macro.c (call_macro): Add * in (*SYMBOL_FUNC (sym)) (...).
        Reported by Karl Vogel.

1993-11-09  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Do not define volatile if already defined.
        Reported by René Seindal.

        * lib/Makefile.in: Add a forgotten ALLOCA=@ALLOCA@.  Grrr!

        Reported by Bernhard Daeubler, Eric Backus, Hal Peterson, Hoang
        Uong, Ian Taylor, Kaveh R. Ghazi, Tom McConnell and Walter Wong.

1993-11-08  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Define strchr and strrchr in terms of index and rindex,
        instead of the other way around.
        * builtin.c, m4.c, path.c: Use strchr instead of index.

        * input.c (next_char): Remove a "break;" after a "return ...;".
        Reported by Tom McConnell.
\f
1993-11-08  François Pinard  <pinard@iro.umontreal.ca>

        * Release 1.1

        * configure.in: Do not copy check files in the build hierarchy.
        * checks/check-them: Identify the m4 version being checked.  For
        finding m4, look in $PATH instead of in the parent directory.
        * Makefile.in (check): Prepend `pwd` to $PATH before checking.
        * checks/Makefile.in (.all-stamp): Always create check files in
        the source hierarchy, not anymore in the build hierarchy.
        (check): cd to the source hierarchy before performing checks.
        Do not copy nor clean COPYING anymore, take it from `..'.
        Reported by Tom McConnell.

        * Makefile.in (Makefile): Use $(SHELL).
        (config.status): Use $(SHELL).  Use "config.status --recheck"
        instead of "configure --no-create", which is obsolete.
        Reported by Tom McConnell.

1993-11-05  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c (usage): Use "%s" instead of "m4" in format string.
        Reported by Jim Meyering.

        * Makefile.in: Distribute mkinstalldirs.
        Reported by Pierre Gaumond.
        Reported by Jim Meyering.
        Reported by Tom McConnell.
        Reported by Andreas Gustafsson.

        * checks/check-them: Renamed from checks/check_them.
        * checks/get-them: Renamed from checks/get_them.
        * checks/.all-stamp: Renamed from checks/.all_stamp.
        * checks/Makefile.in: Changed accordingly.
        Reported by Jim Meyering.

1993-11-04  François Pinard  <pinard@iro.umontreal.ca>

        * lib/Makefile.in (dist): Correct permissions on files.

        * output.c: Declare tmpfile, some systems don't.

1993-11-03  François Pinard  <pinard@iro.umontreal.ca>

        * checks/Makefile.in (dist): Correct permissions on files.

        * Makefile.in (dist): Ensure recursive linking for subdirectory
        `examples', also set read/write permissions on all its files.

        * mkinstalldirs: New, from elsewhere.
        * Makefile.in: Use it.

        * debug.c: Synchronize debug messages and regular output when
        the debug file and stdout are redirected to the same file.
        * configure.in: Add (commented) checks for fileno and fstat.
        Reported by Jim Avera.

        * builtin.c (m4_ifelse): Diagnose excess arguments if 5, 8, 11,
        etc., arguments, then ignore the superfluous one.  m4 used to
        diagnose missing arguments and return the empty string.
        Reported by Nick S. Kanakakorn.

1993-11-02  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c (main): At end of all input, ensure all undiverted text
        goes to the main output stream.
        Reported by Andreas Gustafsson.

        * m4.c (main): exit (0), instead of return 0.

        * m4.c: Implement -P and --prefix-builtins.
        * builtin.c: Delete const specifier on builtin_tab.
        (prefix_all_builtins): New.
        Reported by Noah Friedman.
        Reported by Scott Bartram.

        * c-boxes.el: New, from elsewhere.
        * Makefile.in: Distribute it.

        * m4.h: Do not define bcopy if <string.h> defines it.
        Reported by Stephen Perkins.

        * builtin.c (define_macro): Allow a missing second argument, in
        which case it is implied empty.  Affects define and pushdef.
        Reported by Eric Allman.

1993-11-01  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Add blind_if_no_args in struct builtin, blind_no_args in
        struct symbol adn SYMBOL_BLIND_NO_ARGS macro.
        * builtin.c: Initialize all the blindness fields in builtin_tab.
        (define_builtin): Copy the blindness of a builtin into its symbol.
        * macro.c (expand_token): Avoid processing a blind builtin if the
        next character is not an opening parenthesis.
        Reported by David MacKenzie.
        Reported by Noah Friedman.

        * configure.in: Ensure an exit status of 0 on completion.
        Reported by Vivek P. Singhal.

        * eval.c (eval_lex): Admit both lower and upper case letters for
        bases greater than 10.  Only lower case letters were accepted.

        * eval.c (eval_lex): Recognize 0bDIGITS and 0rRADIX:DIGITS syntax.
        Reported by Krste Asanovic.

        * eval.c:  Rename NOT to LNOT.  Add XOR, NOT, LSHIFT and RSHIFT.
        * eval.c (logical_not_term): New name for not_term.
        * eval.c (xor_term): New, between or_term and and_term.
        * eval.c (not_term): New, between and_term and logical_not_term.
        * eval.c (shift_term): New, between cmp_term and add_term.
        Reported by Krste Asanovic: ~, ^, <<, >>.
        Reported by Ben A. Mesander: ** vs ^.

        * m4.c: Delete xmalloc.c, xrealloc.c, xstrdup.c.
        * m4.h: Delete xrealloc.c.
        * lib/xmalloc.c: New, from elsewhere.
        * lib/xstrdup.c: New, from elsewhere.
        * lib/Makefile.in: Distribute and compile them.

        * m4.c: Change progname to program_name.
        * builtin.c, eval.c, m4.c, m4.h: Rename error to m4error.
        * lib/error.c: New, from elsewhere.
        * lib/Makefile.in: Distribute and compile error.c.
        * configure.in: Check AC_VPRINTF and for strerror.
        * m4.c: Delete cmd_error.  Use error instead.
        * m4.c: Change label capitalisation to "ERROR", "Warning", etc.

        * m4.h: Delete #define const, let Autoconf takes care of this.

        * m4.c: Remove all code conditionalized by IMPLEMENT_M4OPTS.
        Merge parse_args into main.  Declare argv to be `char *const *',
        then remove superfluous casts.

        * m4.c: Rename --no-gnu-extensions to --traditional.
        Reported by Ben A. Mesander.

        * m4.c (usage): Add a status parameter.  Supply one in various
        calls.  Add --help processing.  Remove -V for --version.

        * lib/Makefile.in: Put $(CFLAGS) last in .c.o rule.

        * lib/Makefile.in: Have an AR=ar declaration.
        Reported by Eric Backus.
        Reported by Bjorn R. Bjornsson.
        Reported by Tom Tromey.
        Reported by Kristine Lund.
        Reported by Marion Hakanson.

1993-10-30  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (m4.info): Use -I$(srcdir) on $(MAKEINFO).
        Reported by Noah Friedman.

1993-10-25  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Remove MDEFINES and cleanup.

1993-06-09  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (dist): Replace "echo `pwd`" by a mere "pwd".
        Create a gzip file.

1993-02-06  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in, lib/Makefile.in, check/Makefile.in: In dist goals,
        ensure 777 mode for directories, so older tar's will restore file
        modes properly.

1993-01-17  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in, lib/Makefile.in: Put $(CFLAGS) after $(CPPFLAGS),
        so the installer can override automatically configured choices.
        Reported by Karl Berry.

1993-01-15  François Pinard  <pinard@iro.umontreal.ca>

        * lib/vfprintf.c: Stolen from Oleo distribution and adapted.  The
        previous version was not working properly on m68k-hp-bsd4.3.
        Reported by Roland McGrath.

        * lib/_doprnt.c: Stolen from Oleo distribution.
        * configure.in: Check for _doprnt.c if vfprintf.c selected.
        * lib/Makefile.in: Distribute _doprnt.c.
        Do not distribute regex.[ch].old anymore.

1993-01-01  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in, lib/Makefile.in: Reinstate $(CPPFLAGS), use it.
        Richard wants it there.

1992-12-27  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Add DEFS to MDEFINES.
        * lib/Makefile.in (.c.o): Remove $(CPPFLAGS).
        (libm4.a): Remove the library before creating it.
        (distclean): Remove tags and TAGS too.

1992-12-23  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (dvi, m4.dvi): New goals.

        * builtin.c, eval.c, format.c, input.c, m4.[ch], m4.texinfo,
        macro.c, output.c, path.c, symtab.c: Change Copyright from
        1989-1992 to the explicit enumeration 1989, 1990, 1991, 1992.

        * examples/divert.m4: Deleted, this bug has been corrected.

        * Makefile.in (texclean, mostlyclean): New goals.

        * Makefile.in (clean): Remove clutter from ansi2knr.
        Reported by Pierre Gaumond.

1992-12-20  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Remove $(CPPFLAGS) from the .c.o rule.  The user
        might well use CFLAGS is s/he needs it.

        * Makefile.in: Allow installation of info files from a separate
        build directory.
        Reported by Jason Merrill.
        Reported by David MacKenzie.
        Reported by Skip Montanaro.
        Reported by Erez Zadok.
        Reported by Assar Westerlund.
\f
1992-12-19  François Pinard  <pinard@iro.umontreal.ca>

        * Release 1.0.3
        This is still a beta release for the future GNU m4 version 1.1.

        * lib/alloca.c: New, from elsewhere.
        * lib/Makefile.in: Distribute it.  Define and use $(ALLOCA).

        * m4.h: Do not define index/rindex if already defined.  If
        FALSE/TRUE are already defined, do not redefine them, but merely
        define boolean typedef to int.

        * Makefile.in: Use $(DEFS) while compiling ansi2knr.
        * ansi2knr.c: Rewrite #ifdef HAVE_STRING_H || STDC_HEADERS,
        because some C compilers do not like connectives with #ifdef.
        * m4.h: Define `volatile' only if __GNUC__, instead of once for
        __GNUC__ and once for __STDC__.
        * lib/regex.h: Leave const alone, AC_CONST will take care of it.

        * checks/Makefile.in: Use .all_stamp instead of $(CHECKS) for
        Makefile dependencies.  Without it, make keeps destroying and
        remaking $(CHECKS) in a loop (why?).  Distribute .all_stamp.

        * m4.h, m4.c, builtin.c, output.c: Change all divertion/DIVERTION
        to diversion/DIVERSION, this was a spelling error.

        * m4.c: Declare version[], remove #include "version.h".
        * version.h: Deleted.
        * Makefile.in: Remove references to version.h.

        * output.c (shipout_text): Centralize all `#line NUM ["FILE"]'
        production, by using a simpler and more robust algorithm.  This
        solves the problem of synclines sometimes written in the middle of
        an output line.  Delete sync_line() and output_lines variable.
        * m4.h: Remove sync_line prototype and output_lines declaration.
        * input.c (next_char), output.c (shipout_text): Remove references
        to output_lines.
        * input.c (push_file, pop_file): Merely put the value -1 in
        output_current_line instead of calling sync_line, for delaying a
        single `#line NUM FILE' before next output line.  Do not test
        for sync_output, because this is unnecessary clutter.
        * output.c (make_divertion, insert_divertion): Idem.
        * input.c: Rename must_advance_line to start_of_input_line, for
        consistency.

        * debug.c (trace_header): Select a new debug line format, which
        better complies with GNU standards for formatting error messages.
        With option `-dfl', M-x next-error might be used on the output.
        * m4.c (vmesg): Adjust format of error output to GNU standards.
        * m4.texinfo: Adjust examples for `make check' to work.

        * m4.h, builtin.c, debug.c, input.c, macro.c, path.c: Use upper
        case for enum debug_info constants, which were all lower case.

        * builtin.c (m4_regexp, m4_patsubst): Use re_search instead of
        re_search_2.
        * lib/regex.[ch]: Use new version from textutils 1.3.6, with some
        collected patches.  I tried a few times using newer regex.[ch], it
        mysteriously stopped aborting with this one.  Insecure feeling...
        * lib/Makefile.in: Distribute regex.[ch].old, just in case!

1992-12-18  François Pinard  <pinard@iro.umontreal.ca>

        * m4.c: Change `--no-warnings' to `--silent'.
        Reported by David MacKenzie.

        * m4.c: Put all M4OPTS code upon IMPLEMENT_M4OPTS control, and
        leave it off for now.  See comment in m4.c for justification.
        Reported by David MacKenzie.

        * configure.in: Replace AC_USG by AC_HAVE_HEADERS(string.h).
        * m4.h, ansi2knr.c, lib/regex.h: Replace USG by HAVE_STRING_H.

        * Makefile.in: Add a new `info' goal.  Use macro MAKEINFO.

        * Makefile.in: Ensure recursive cleaning is done before local
        cleaning for all clean goals.

        * builtin.c (ntoa): Ensure the value is always interpreted as a
        signed quantity, whatever the radix is.

1992-11-18  Jim Meyering  <meyering@idefix>

        * builtin.c, format.c, input.c: Split long lines.
        * m4.c: Use typedef macro_definition instead of struct
        macro_definition.
        * symtab.c: Use typedef symbol instead of struct symbol.

1992-11-17  François Pinard  <pinard@iro.umontreal.ca>

        * *.[ch]: Remove all trailing whitespace, in code and comments.

        * configure.in: Find some awk.
        * Makefile.in: Add $(AWK) to MDEFINES.
        * checks/Makefile.in: Transmit $(AWK) to get_them.
        * checks/get_them: Use $AWK instead of gawk.  Add a close in the
        awk script when switching files, because without this, mawk runs
        out of file descriptors.

1992-11-16  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (realclean): Delete m4.info*.
        Reported by Jim Meyering.

        * Makefile.in: Adjust and link with checks/Makefile.
        * checks/Makefile.in: New.
        * configure.in: Output checks/Makefile.

        * checks/get_them: Have the dnl header of each test more
        recognizable by next-error, also use a better message.

1992-11-16  Jim Meyering  <meyering@idefix>

        * m4.h [__GNUC__]: Use __volatile__ instead of `volatile.'
        And use that only if __GNUC__ since we're using it's GCC-specific
        semantics that tell the compiler the associated function doesn't
        return.

        * builtin.c (substitute): Don't use character as an array index.
        (dumpdef_cmp): Make formal arguments `const void *' to avoid
        warnings with gcc -W -Wall on systems with qsort prototype.
        (m4_errprint): Cast obstack_finish to `char *' to avoid warnings
        from gcc -W -Wall.

        * eval.c (most functions): Add parentheses to assignments used
        as truth values go avoid warnings from gcc -Wall.

        * input.c, m4.c, output.c, path.c, symtab.c: Declare static
        any functions that don't need external scope.

        * builtin.c, debug.c, format.c, m4.c, m4.h, macro.c, symtab.c
        (many functions and arrays): Declare `const'.

1992-11-15  François Pinard  <pinard@iro.umontreal.ca>

        * *.[ch]: Rename nil to NULL, using the declaration from <stdio.h>,
        removing the declaration from m4.h.  Also rename false to FALSE
        and true to TRUE.

        * lib/Makefile.in (Makefile): New goal.

        * Makefile.in, lib/Makefile.in: Add a .c.o rule, so CFLAGS is not
        so heavily loaded.  It gets more easily overridable, calling make.
        Reported by Jim Meyering.

        * Makefile.in (dist): Get .fname from the current directory name,
        instead of from version.h.  I need updating many files manually,
        when the version changes, version.h is just one of them.

1992-11-14  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Remove the tag `boolean' on the enum introducing typedef
        `boolean'.  This tag conflicts with <sys/types.h> on SVR4.
        Reported by Tom McConnell.

1992-11-13  François Pinard  <pinard@iro.umontreal.ca>

        * m4.texinfo: Correct the examples for 33.divert, 38.divnum,
        39.cleardiv, which were describing missing or spurious newlines.
        Modify examples 52.eval, 53.esyscmd and 54.sysval so the results
        do not depend on machine word size, `/bin/false' implementation,
        or `wc' output format.  `make check' is more dependable, now.

        * checks/check_them: Summarize the failed tests by listing their
        name, at end.  If none, issue `All checks successful'.  Output
        `Checking' instead of `Input file:'.

        * checks/get_them, checks/check_them: Reindented.

        * Makefile.in (dist): chmod a+r before making the tar file.

1992-11-12  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c (m4_dnl): Diagnose any parameter to `dnl'.

        * input.c (next_token): Reinitialize token_buttom just after using
        it as a watermark with obstack_free.  Or else, a future token, big
        enough for triggering reallocation of the obstack chunk, could
        void the initialized value of token_buttom, later causing panic in
        obstack_free.  Rename token_buttom to token_bottom everywhere.

        * m4.h: Before declaring errno, first include <errno.h> and
        ensure that it does not define errno.
        Reported by Richard Stallman.

1992-11-11  François Pinard  <pinard@iro.umontreal.ca>

        * builtin.c: Define and use DECLARE macro for builtins.

        * builtin.c (m4_ifelse): Avoid any diagnostic when exactly one
        argument, this is a common idiom for introducing long comments.

        * builtin.c (m4_ifelse): If 3n + 2 arguments, diagnose missing
        arguments.  The last argument was silently ignored.

        * m4.c (cmd_error): Add a missing semicolon before va_end().

1992-11-10  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in: Now handle protoized sources.  Define and use U.
        Compile and use ansi2knr with old compilers.  Update DISTFILES.
        Add `aclocal.m4' to `configure' dependencies.
        * ansi2knr.c: New, from Ghostscript distribution.
        * configure.in: Define U through FP_PROTOTYPES for old compilers.
        Add AC_ISC_POSIX, AC_CONST, AC_SIZE_T.
        * aclocal.m4: New, provide FP_PROTOTYPES.
        * m4.h: Conditionnaly protoized through Args, save for varags.
        * builtin.c: Protoized.  Then:
        Include <sys/types.h> if size_t is not defined, before "regex.h".
        (m4_ifelse): Fetch built-in name properly for diagnostic.
        (m4_dumpdef): Remove wrong (char *) cast calling dump_symbol.
        (m4_regexp): Add const to `msg' declaration.
        (m4_patsubst): Add const to `msg' declaration.
        * debug.c: Protoized, save for varargs.
        * eval.c: Protoized.
        * format.c: Protoized.
        * input.c: Protoized.
        * m4.c: Protoized, save for varargs.  Then:
        (xfree): Accept void * instead of char *.
        (xmalloc): Return void * instead of char *.
        (xrealloc): Accept and return void * instead of char *.
        * macro.c: Protoized.
        * output.c: Protoized.
        * path.c: Protoized.  Then cast some (char *) over xmalloc's.
        * symtab.c: Protoized.

1992-11-06  François Pinard  <pinard@iro.umontreal.ca>

        * m4.texinfo: Remove directory from diagnostics in 30.include,
        51.eval, 56.errprint and 57.m4exit tests.

        * m4.h: Remove declarations for int or void system functions, they
        cause more conflicting trouble than they make good.

        * configure.in: Avoid configuration header file.  Add some tests.
        * m4.h: Remove #include "config.h".
        * Makefile.in, lib/Makefile.in: Implement Autoconf interface.
        Then, rewritten for better compliance with GNU standards.

1992-11-05  François Pinard  <pinard@iro.umontreal.ca>

        * format.c (format): Avoid syntax error if not HAVE_EFGCVT,
        because of a misplaced #endif.

        * Many *.[hc] files: Correct intra-line spacing here and there,
        according to GNU indent 1.6 advice.

        * configure.in: New, using Autoconf 1.2.
        * m4.h: Reverse NO_MEMORY_H to NEED_MEMORY_H.
        * Delete old configure.in, configure, etc/configure.in,
        etc/configure, lib/configure.in, lib/configure and config/*.
        Reported by Jason Merrill.

        * symtab.c (hash): Change (char) NULL to '\0'.
        Reported by Jason Merrill.

        * Delete .vers, etc/newdist.sh, etc/newvers.sh and
        etc/nextvers.sh.  Release numbers will be edited `by hand'.
        * version.h: De-automatize, force value in.

        * m4.c: Changes in order to use a newer getopt.h.
        Reported by David MacKenzie.

        * checks/: New name for examples/.
        * checks/get_them: New location for etc/get_examples.
        * checks/check_them: New location for etc/check_examples.
        * Makefile.in, checks/get_them, checks/check_them: Adjust.
        * lib/vfprintf.c: New location for etc/vfprintf.c.
        * Delete empty etc/.
        * examples/: New name for test/.

1992-03-10  François Pinard  <pinard@iro.umontreal.ca>

        * Makefile.in (check): Add m4 as dependency.

        * m4.c: Accept --no-warnings instead of --no_warnings, and
        --no-gnu-extensions instead of --no_gnu_extensions.  Make the
        usage message more informative.
        Reported by David MacKenzie.

1992-03-09  François Pinard  <pinard@iro.umontreal.ca>

        * etc/check_examples: New name for check_examples.sh.
        * etc/get_examples: New name for get_examples.sh.
        * Makefile.in, etc/Makefile.in: Use new names.

        * Makefile.in: Transmit $(CC) while making in lib.

        * Many *.[hc] files: GNU indent'ed, with further fine tuning of
        code disposition by hand.

1992-03-08  François Pinard  <pinard@iro.umontreal.ca>

        * m4.h: Delete definitions for abort() and exit().
        Reported by Richard Stallman.

        * config/hmake-unicos, config/s-unicos.h: New files.
        Reported by Hal Peterson.

        * eval.c (exp_term): Have N^0 return 1.
        Reported by Michael Fetterman.

        * eval.c, input.c, m4.h: Remove last comma in enums.
        Reported by Mike Lijewski.

        * Transfer of maintenance duties from René to François.
\f
1991-10-24  René Seindal <seindal@diku.dk>

        * Release 1.0.  Many thanks to those, who provided me with bug
        reports and feedback.

        * Uses GNU configure, taken from the gdb distribution.

        * Uses GNU getopt(), with long option names.

        * The -Q/+quiet option is added, which suppresses warnings about
        missing or superflous arguments to built-in macros.

        * Added default options via the M4OPTS environment variable.

        * The built-in format can now be configured to use sprintf as
        the formatting engine, for systems without [efg]cvt(3).

        * GNU library code is moved to the ./lib subdirectory; other
        utility files are now in ./etc.

        * Several minor bugs have been fixed.
\f
1991-07-26  René Seindal <seindal@diku.dk>

        * Fixed various bugs.  Release 0.99, manual 0.09.  Many thanks to
        François Pinard and Roland H. Pesch for providing me with reports.

        * The builtins incr and decr are now implemented without use of
        eval.

        * The builtin indir is added, to allow for indirect macro calls
        (allows use of "illegal" macro names).

        * The debugging and tracing facilities has been enhanced
        considerably.  See the manual for details.

        * The -tMACRO option is added, marks MACRO for tracing as soon
        as it is defined.

        * Builtins are traced after renaming iff they were before.

        * Named files can now be undiverted.

        * The -Nnum option can be used to increase the number of
        divertions available.

        * Calling changecom without arguments now disables all comment
        handling.

        * The function m4_patsubst() is now consistently declared
        static.

        * A bug in dnl is fixed.

        * A bug in the multi-character quoting code is fixed.

        * Several typos in the manual has been corrected.  More probably
        persist.

        * The m4.info file is now installed along with the program.
\f
1990-11-15  René Seindal <seindal@diku.dk>

        * Updated and enhanced version.  Release 0.75, manual 0.07.

        * Implemented search path for include files (-I option and
        M4PATH envronment variable).

        * Implemented builtin "format" for printf-like formatting.

        * Implemented builtin "regexp" for searching for regular
        expressions.

        * Implemented builtin "patsubst" for substitution with regular
        expressions.

        * Implemented builtin "esyscmd", which expands to a shell
        commands output.

        * Implemented "__file__" and "__line__" for use in error
        messages.

        * Implemented character ranges in "translit".

        * Implemented control over debugging output.

        * Implemented multi-character quotes.

        * Implemented multi-character comment delimiters.

        * Changed predefined macro "gnu" to "__gnu__".

        * Changed predefined macro "unix" to "__unix__", when the -G
        option is not used.  With -G, "unix" is still defined.

        * Changed "shift", "$@" and "$*" to not insert spaces afters
        commas.

        * Added program name to error messages.

        * Fixed two missing null bytes bugs.
\f
1990-01-22  René Seindal <seindal@diku.dk>

        * Initial beta release.  Release 0.50, manual 0.05.


        -----

        Local Variables:
        coding: utf-8
        End:

        Copyright (C) 1990, 1991, 1992, 1993, 1994, 2000, 2001, 2003,
        2005, 2006, 2007, 2008 Free Software Foundation, Inc.

        Copying and distribution of this file, with or without
        modification, are permitted provided the copyright notice
        and this notice are preserved.