1 * Major changes in Autoconf 2.57g -*- outline -*-
3 ** autoreconf and auxiliary directory
4 Autoreconf creates the auxiliary directory if needed. This is
5 especially useful for initial "bootstrapping" of fresh CVS checkouts.
8 Use this macro to declare the directory for local m4 macros for aclocal.
10 * Major changes in Autoconf 2.57f
12 Released 2003-10-01, by Akim Demaille.
14 * Major changes in Autoconf 2.57e
16 Released 2003-09-29, by Akim Demaille.
19 The directory for its first argument is automatically created. For
22 AC_CONFIG_COMMANDS([src/modules.hh], [...])
24 $top_builddir/src/ is created if needed.
26 * Major changes in Autoconf 2.57d
28 Released 2003-09-25, by Akim Demaille.
30 * Major changes in Autoconf 2.57b
32 Released 2003-08-24, by Akim Demaille.
34 ** Autotest and local.at
35 The optional file local.at is always included in Autotest test suites.
38 The warnings are always issued, including with cached runs.
39 This became a significant problem since aclocal and automake can
40 run autoconf behind the scene.
42 ** autoheader warnings
43 The warnings of autoheader can be turned off, using --warning.
44 For instance, -Wno-obsolete disables the complaints about acconfig.h
45 and other deprecated constructs.
47 * Major changes in Autoconf 2.57a
49 Released 2003-06-20 by Akim Demaille.
52 AC_C_RESTRICT, AC_INCLUDES_DEFAULT.
54 ** AC_DECL_SYS_SIGLIST
58 Now checks that mktime is the inverse of localtime.
60 ** Improve DJGPP portability
61 The Autoconf tools and configure behave better under DJGPP.
63 ** Present But Cannot Be Compiled
64 New FAQ section dedicated to the mystic
66 configure: WARNING: pi.h: present but cannot be compiled
67 configure: WARNING: pi.h: check for missing prerequisite headers?
68 configure: WARNING: pi.h: proceeding with the preprocessor's result
71 ** Concurrent executions of autom4te
72 autom4te now locks its internal files, which enables concurrent
73 executions of autom4te, likely to happen if automake, autoconf,
74 autoheader etc. are run simultaneously.
77 Use of Libtool 1.5 and higher is encouraged. Compatibility with
78 Libtool pre-1.4 is not checked.
81 Testsuites no longer rerun failed tests in verbose mode; instead,
82 failures are logged while the test is run.
84 In addition, expected failures can be marked as such.
86 * Major changes in Autoconf 2.57
88 Released 2002-12-03 by Paul Eggert.
90 Bug fixes for problems with AIX linker, with freestanding C compilers,
91 with GNU m4 limitations, and with obsolete copies of GNU documents.
93 The Free Documentation License has been upgraded from 1.1 to 1.2.
95 * Major changes in Autoconf 2.56
97 Released 2002-11-15 by Akim Demaille.
99 One packaging problem fixed (config/install-sh was not executable).
101 * Major changes in Autoconf 2.55
103 Released 2002-11-14 by Akim Demaille.
107 Have your configure.ac checked by autoscan ("autoscan").
108 Try the warning options ("autoreconf -fv -Wall").
112 - AC_CHECK_HEADER, AC_CHECK_HEADERS
113 More information on proper use.
115 - Writing Test Programs
117 This sections explains how to write good test sources to use with
118 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAMS and so forth.
120 - AC_FOO_IFELSE vs. AC_TRY_FOO
122 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
123 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
127 - Is more robust to different Gettext installations.
129 - Produces messages (when --verbose) to be understood by Emacs'
132 - Supports -W/--warnings.
135 Once the GNU Build System reinstalled, run `./config.status
136 --recheck && ./config.status && make' if possible.
140 - Supports --cache, and --no-cache.
142 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
143 (autom4te.cache). See `Customizing autom4te' in the documentation.
150 Support for the obsoleted options -m, --macrodir, -l, --localdir is
151 dropped in favor of the safer --include/--prepend-include scheme.
156 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
157 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
158 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
161 Obsoleted macros are kept for Autoconf backward compatibility, but
162 should be avoided in configure.ac. Running autoupdate is advised.
165 - AC_DEFINE/AC_DEFINE_UNQUOTED
167 We have to stop using the old compatibility scheme --that tried to
168 avoid useless backslashes-- because Libtool 1.4.3 contains a
170 AC_DEFINE([error_t], [int],
171 [Define to a type to use for \`error_t' if it is not
172 otherwise available.])
174 We have to quote the single quotes and backslashes with \. The old
175 compatibility scheme saw that ` was backslashed, and therefore did
176 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
177 compatible with Libtool. Autoconf 2.55 is, but in some cases might
178 produce more \ than wanted.
180 Please, note that in the future the same problem will happen with
181 AC_MSG_*: use `autoreconf -f -Wall'.
185 - Portability of the Autoconf package to Solaris.
187 - Spurious warnings caused by config.status.
188 This bug is benign, but painful: on some systems (typically
189 FreeBSD), warnings such as:
191 config.status: creating Makefile
192 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
194 could be issued. This is fixed.
197 Simultaneous executions of config.status are possible again.
199 - Precious variables accumulation
201 config.status could stack several copies of the precious variables
205 ** Plans for later versions
209 The compatibility hooks with the old scheme will be completely
210 removed. Please, advice/use `--build', `--host', and `--target'
213 - AC_CHECK_HEADER, AC_CHECK_HEADERS
215 The tests will be stricter, please make sure your invocations are
220 Shell functions will gradually be introduced, probably starting with
221 Autotest. If you know machines which are in use that you suspect
222 *not* to support shell functions, please run the test suite of
223 Autoconf 2.55 on it, and report the results to
224 bug-autoconf@gnu.org.
228 Special characters in AC_MSG_* need not be quoted. Currently,
229 Autoconf has heuristics to decide when a string is escaped, or has
230 to be escaped. This scheme is fragile, and will be removed; the
231 only risk is uglified messages. Please, run `autoreconf -f -Wall'
232 to find occurrences that will be affected.
234 * Major changes in Autoconf 2.54
236 Released 2002-09-13 by Akim Demaille.
240 - autoreconf no longer changes the version of the gettext/po/intl
241 support files. It now adds the files the correspond to the
242 AM_GNU_GETTEXT_VERSION declared in configure.ac.
244 Warning: It now relies on the 'autopoint' program, which is part
245 of GNU gettext 0.11.4 and newer.
247 Please note that you need to have a GNU gettext version that
248 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
249 in configure.ac. You can upgrade to newer GNU gettext versions,
250 though, without needing to change configure.ac.
252 - The -I DIR or --include=DIR option now appends DIR to the include path
253 instead of prepending; this is for consistency with other GNU tools.
254 The new -B DIR or --prepend-include=DIR option has the old behavior.
259 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
260 Please, remove lines such as
262 # This is necessary so that .o files in LIBOBJS are also
263 # built via the ANSI2KNR-filtering rules.
264 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
266 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
267 your Makefiles either.
269 - AC_CONFIG_LINKS now makes copies if it can't make links.
271 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
272 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
273 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
275 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
277 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
279 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
283 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
284 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
285 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
288 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
291 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
292 for an AC_LIBOBJ replacement.
296 - Spurious complaints from `m4_bmatch' about invalid regular
297 expressions are suppressed.
299 - Empty top_builddirs are properly handled.
301 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
304 Now colon in the optional path arguments are properly handled.
306 ** Improved portability
308 - Both Autoconf the package, and the scripts it produces, should run
309 more reliably with Zsh. Bear in mind it is the default Bourne shell
312 - Autoconf and the scripts it produces no longer assume the existence of
313 the obsolescent commands egrep and fgrep.
317 - Limitations of Make
321 The GNATS base has moved to
322 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
327 Now contains the list of ouput variables and files (AC_SUBST,
330 * Major changes in Autoconf 2.53
332 Released 2002-03-08 by Akim Demaille.
336 Perl 5.005_03 or later is required: autom4te is written in Perl and is
337 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
343 Argument requirements, output variables, defined macros.
344 - M4sugar, M4sh, Autotest
346 - Double quoting macros
347 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
349 The Autoconf manual is now distributed under the terms of the GNU FDL.
350 - Section `Hosts and Cross-Compilation'
351 Explains the rationale for the 2.5x changes in the cross-compilation
352 chain, and in the relationships between build, host, and target
354 Emphasizes that `cross-compilation' == `--host is given'.
355 If you are working on compilers etc., be sure to read this section.
356 - Section `AC_LIBOBJ vs. LIBOBJS'
357 Explains why assigning LIBOBJS directly is now an error.
358 Details how to update the code.
363 Now used instead of hard coded line numbers.
364 This eases the comparison of `configure's, and diminishes the
365 pressure over control version archives.
366 Automatic replacement for shells that don't support this feature.
367 - New output variables
368 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
373 Autoconf and Autotest modes are provided.
378 New, used by the Autoconf suite to cache and speed up most processing.
380 Supported by autom4te, autoconf and autoheader.
382 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
383 autoupdate, and autoreconf.
385 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
386 automake options are to be given via AUTOMAKE_OPTIONS.
388 Runs gettextize and libtoolize when appropriate.
390 --m4dir is no longer supported.
392 Now runs only in the specified directories, defaulting to `.',
393 but understands AC_CONFIG_SUBDIRS for dependent directories.
394 Before, it used to run on all the `configure.ac' found in the
396 Independent packages are properly updated.
400 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
402 Under the user pressure, $? is finally available. Probably a mistake.
403 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
404 - Precious variables accumulation
405 config.status could stack several copies of the precious variables
407 - AC_PATH_PROG and family.
408 Works properly when given a literal path.
410 Somewhere since 2.13, the result had been reversed.
414 - AC_C_BIGENDIAN supports the cross-compiling case.
415 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
416 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
417 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
419 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
420 precision than `double'.
425 It now defines the preprocessor symbols PACKAGE_NAME,
426 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
430 Admits a fourth optional parameter: the tar name.
432 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
433 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
434 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
437 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
438 Are much less expensive when using long lists of files.
441 Works with shell variables, and non alphanumeric names.
445 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
446 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
448 - AC_FUNC_STRTOD substitutes POW_LIB.
453 * Major changes in Autoconf 2.52
455 Released 2001-07-18 by Akim Demaille.
460 This feature was present in autoconf 2.50 but was not documented.
461 For example, `@<:@' is translated to `[' just before output. This
462 is useful when writing strings that contain unbalanced quotes, or
463 other hard-to-quote constructs.
464 - m4_pattern_forbid, m4_pattern_allow
465 - Tips for upgrading from 2.13.
466 - Using autoscan to maintain a configure.ac.
469 - Now include stdint.h.
470 - sys/types.h and sys/stat.h are guarded.
471 - strings.h is included if available, and not conflicting with string.h.
474 - The test suite is more robust and presents less false failures.
475 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
476 - configure accepts --prefix='' again.
477 - AC_CHECK_LIB works properly when its first argument is not a
479 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
480 - build_, host_, and target_alias are AC_SUBST as in 2.13.
481 - AC_ARG_VAR properly propagates precious variables inherited from the
482 environment to ./config.status.
483 - Using --program-suffix/--program-prefix is portable.
484 - Failures to detect the default compiler's output extension are less
486 - `config.status foo' works properly when `foo' depends on variables
487 set in an AC_CONFIG_THING INIT-CMD.
488 - autoheader is more robust to broken input.
489 - Fixed Fortran name-mangling and link tests on a number of systems,
490 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
493 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
494 specify pre-includes. In this case, the headers are compiled with
495 cc, not merely preprocessed by cpp. Therefore it is the _usability_
496 of a header which is checked for, not just its availability.
497 - AC_ARG_VAR refuses to run configure when precious variables have
499 - Versions of compilers are dumped in the logs.
500 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
503 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
504 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
505 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
506 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
507 Be sure to read `Upgrading from Version 2.13' to understand why
508 running `autoupdate' is needed.
509 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
510 a main-like routine is required/possible when linking C/C++ with
511 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
512 - AC_FUNC_GETPGRG behaves better when cross-compiling.
514 * Major changes in Autoconf 2.51
515 There was no release of Autoconf 2.51 since some packagers had used
516 this version number without permission to ship intermediary versions
517 of 2.50. The version was skipped to avoid confusion.
520 * Major changes in Autoconf 2.50
522 Released 2001-05-21 by Akim Demaille.
525 There have been far too many to enumerate them here. Check out
526 ChangeLog if you really want to know more.
528 ** Improved documentation
529 In particular, portability issues are better covered.
532 All the standard GNU Makefile targets are supported. The layout has
533 changed: m4/ holds the m4 extensions Autoconf needs for its
534 configuration, doc/ contains the documentation, and tests/ contains
537 ** Man pages are provided
538 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
539 config.guess, config.sub.
543 Provides a safe and powerful means to trace the macro uses. This
544 provide the parsing layer for tools which need to `study'
548 Specify what category of warnings should be enabled.
550 - When recursing into subdirectories, try for configure.gnu before
551 configure to adapt for packages not using autoconf on case-insensitive
555 More errors are now caught (circular AC_REQUIRE dependencies,
556 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
557 etc.). In addition, their location and call stack are given.
560 autoupdate is much more powerful, and is able to provide the glue code
561 which might be needed to move from an old macro to its newer
564 You are strongly encouraged to use it to modernize both your
565 `configure.in' and your .m4 extension files.
568 The internal machinery of autoheader has completely changed. As a
569 result, using `acconfig.h' should be considered to be obsoleted, and
570 you are encouraged to get rid of it using the AH macros.
575 ** Fortran 77 compilers
576 Globally, the support for Fortran 77 is considerably improved.
578 Support for automatically determining a Fortran 77 compiler's
579 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
580 provided to wrap C/C++ identifiers, thus making it easier and more
581 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
582 call C/C++ routines. See the Texinfo documentation for details.
585 The test suite no longer uses DejaGNU. It should be easy to submit
586 test cases in this new framework.
589 - --help, --help=long, -hl
590 no longer dumps useless items.
592 lists only specific options.
593 - --help=recursive, -hr
594 displays the help of all the embedded packages.
595 - Remembers environment variables when reconfiguring.
596 The previous scheme to set envvar before running configure was
598 what prevented configure from remembering the environment in which
599 it was run, therefore --recheck was run in an inconsistent
600 environment. Now, one should run
602 and then --recheck will work properly. Variables declared with
603 AC_ARG_VAR are also preserved.
605 $build defaults to `config.guess`, $host to $build, and then $target
607 Cross-compilation is a global status of the package, it no longer
608 depends upon the current language.
609 Cross compilation is enabled iff the user specified `--host'.
610 `configure' now fails if it can't run the executables it compiles,
611 unless cross-compilation is enabled.
613 The cache file is disabled by default. The new options
614 `--config-cache', `-C' set the cache to `config.cache'.
618 Much faster on most architectures.
619 - concurrent executions
620 It is safe to use `make -j' with config.status.
621 - human interface improved
622 It is possible to invoke
623 ./config.status foobar
624 instead of the former form (still valid)
625 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
626 CONFIG_FILES=foobar:foo.in:bar.in \
628 The same holds for configuration headers and links.
629 You can instantiate unknown files and headers:
630 ./config.status --header foo.h:foo.h.in --file bar:baz
631 - has a useful --help
632 - accepts special file name "-" for stdin/stdout
637 Specify additional copyright information.
640 Now expects the identity of the package as argument.
644 Most macros, if not all, now strictly follow the `one quotation
645 level' rule. This results in a more predictable expansion.
648 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
649 configure scripts, was fixed by Axel Thimm.
653 Document and ask for the registration of an envvar.
656 Specifies the file which `configure' should look for when trying to
657 find the source tree (used to be handled by AC_INIT).
660 To add new actions to config.status. Should be used instead of
664 Replaces AC_LINK_FILES.
666 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
667 AC_CONFIG_LINKS, and AC_CONFIG_FILES
668 They now obey sh: you should no longer use shell variables as
671 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
672 AC_CONFIG_SUBDIRS($my_subdirs)
676 if test "$package_foo_enabled" = yes; then
677 AC_CONFIG_SUBDIRS(foo)
681 To format an Autoconf macro's help string so that it looks pretty
682 when the user executes `configure --help'.
685 ** Generic Test Macros
687 The interface of the AC_CHECK families of macros (decl, header,
688 type, member, func) is now uniform. They support the same set of
691 - AC_CHECK_DECL, AC_CHECK_DECLS
692 To check whether a symbol is declared.
694 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
695 No longer need a cross-compilation default.
698 The test it performs is much more robust than previously, and makes
699 it possible to test builtin types in addition to typedefs.
700 It is now schizophrenic:
701 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
702 remains for backward compatibility, but its use is discouraged.
703 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
704 behaves exactly like the other AC_CHECK macros.
707 Checks whether given types are supported by the system.
709 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
710 Check for given members in aggregates (e.g., pw_gecos in struct
714 Checks if the compiler supports ISO C, included when needs special
718 Checking whether the preprocessor indicates missing includes by the
719 error code. stderr is checked by AC_TRY_CPP only as a fallback.
722 Takes a language as argument and replaces AC_LANG_C,
723 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
725 - AC_LANG_PUSH, AC_LANG_POP
726 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
729 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
730 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
731 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
738 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
741 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
744 Arrange for large-file support.
746 - AC_EXEEXT, AC_OBJEXT
747 You are no longer expected to use them: their computation is
748 performed by default.
751 Every macro has been revisited in order to support at best CC=c++.
753 Major changes in Autoconf 2.14:
754 There was no release of GNU Autoconf 2.14.
756 Major changes in Autoconf 2.13:
758 Released 1999-05-01 by Ben Elliston.
760 * Support for building on Win32 systems where the only available C or
761 C++ compiler is the Microsoft Visual C++ command line compiler
762 (`cl'). Additional support for building on Win32 systems which are
763 using the Cygwin or Mingw32 environments.
764 * Support for alternative object file and executable file extensions.
765 On Win32, for example, these are .obj and .exe. These are discovered
766 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
767 @EXEEXT@ in the output, respectively.
768 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
769 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
770 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
771 * AC_DEFINE now has an optional third argument for a description to be
772 placed in the config header input file (e.g. config.h.in).
773 * The C++ code fragment compiled for the C++ compiler test had to be
774 improved to include an explicit return type for main(). This was
775 causing failures on systems using recent versions of the EGCS C++
777 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
778 script to report that `sometype_t' was present when only `type_t'
780 * Merge of the FSF version of config.guess and config.sub to modernize
781 these scripts. Add support for a few new hosts in config.guess.
782 Incorporate latest versions of install-sh, mkinstalldirs and
783 texinfo.tex from the FSF.
784 * autoreconf is capable of running automake if necessary (and
786 * Support for Fortran 77. See the Texinfo documentation for details.
787 * Bug fixes and workarounds for quirky bugs in vendor utilities.
789 Major changes in Autoconf 2.12:
791 Released 1996-11-26 by David J. MacKenzie
793 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
794 concatenating multiple input files separated by colons, like so:
795 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
796 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
797 The arguments may be shell variables, to compute the lists on the fly.
798 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
799 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
802 Major changes in Autoconf 2.11:
804 Released November 18th, 1996, by David J. MacKenzie
806 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
807 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
808 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
809 * AC_CONFIG_HEADER expands shell variables in its argument.
810 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
811 * The "checking..." messages and the source code for test programs that
812 fail are saved in config.log.
813 * Another workaround has been added for seds with small command length limits.
814 * config.sub and config.guess recognize more system types.
817 Major changes in Autoconf 2.10:
819 Released May 7th, 1996, by Roland McGrath
822 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
823 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
825 Major changes in Autoconf 2.9:
827 Released March 16th, 1996, by Roland McGrath
831 Major changes in Autoconf 2.8:
833 Released March 8th, 1996, by Roland McGrath
837 Major changes in Autoconf 2.7:
839 Released November 22nd, 1995, by David J. MacKenzie
843 Major changes in Autoconf 2.6:
845 Released November 20th, 1995, by David J. MacKenzie
849 Major changes in Autoconf 2.5:
851 Released November 17th, 1995, by Roland McGrath
853 * New configure options --bindir, --libdir, --datadir, etc., with
854 corresponding output variables.
855 * New macro: AC_CACHE_CHECK, to make using the cache easier.
856 * config.log contains the command being run as well as any output from it.
857 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
858 * AC_PROG_INSTALL doesn't cache a path to install-sh, for sharing caches.
859 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
860 AC_CHECK_TOOL can search a path other than $PATH.
861 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
863 Major changes in Autoconf 2.4:
865 Released June 14th, 1995, by David J. MacKenzie
867 * Fix a few bugs found by Emacs testers.
869 Major changes in Autoconf 2.3:
871 Released March 27th, 1995, by David J. MacKenzie
873 * Fix the cleanup trap in several ways.
874 * Handle C compilers that are picky about option placement.
875 * ifnames gets the version number from the right directory.
877 Major changes in Autoconf 2.2:
879 Released March 8th, 1995, by David J. MacKenzie
881 * The ifnames utility is much faster but requires a "new awk" interpreter.
882 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
883 library before existing libs, not after, in case it uses them.
884 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
886 * Many additions to the TODO file :-)
888 Major changes in Autoconf 2.1:
890 Released November 4th, 1994, by David J. MacKenzie
893 * More explanations in the manual.
894 * Fix a spurious failure in the testsuite.
895 * Clarify some warning messages.
896 * autoreconf by default only rebuilds configure and config.h.in files
897 that are older than any of their particular input files; there is a
898 --force option to use after installing a new version of Autoconf.
900 Thanks to everybody who's submitted changes and additions to Autoconf!
901 I've incorporated many of them, and am still considering others for
902 future releases -- but I didn't want to postpone this release indefinitely.
904 Caution: don't indiscriminately rebuild configure scripts with
905 Autoconf version 2. Some configure.in files need minor adjustments to
906 work with it; the documentation has a chapter on upgrading. A few
907 configure.in files, including those for GNU Emacs and the GNU C
908 Library, need major changes because they relied on undocumented
909 internals of version 1. Future releases of those packages will have
910 updated configure.in files.
912 It's best to use GNU m4 1.3 (or later) with Autoconf version 2.
913 Autoconf now makes heavy use of m4 diversions, which were implemented
914 inefficiently in GNU m4 releases before 1.3.
916 Major changes in Autoconf 2.0:
918 Released October 26th, 1994, by David J. MacKenzie
920 ** New copyright terms:
921 * There are no restrictions on distribution or use of configure scripts.
924 * Autoconf manual is reorganized to make information easier to find
925 and has several new indexes.
926 * INSTALL is reorganized and clearer and is now made from Texinfo source.
929 * autoscan to generate a preliminary configure.in for a package by
930 scanning its source code for commonly used nonportable functions,
931 programs, and header files.
932 * ifnames to list the symbols used in #if and #ifdef directives in a
934 * autoupdate to update a configure.in to use the version 2 macro names.
935 * autoreconf to recursively remake configure and configuration header
936 files in a source tree.
938 ** Changed utilities:
939 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
940 * autoconf and autoheader can look for package-local definition files
941 in an alternate directory.
944 * AC_CACHE_VAL to share results of tests between configure runs.
945 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
946 that macros invoked with AC_REQUIRE don't interrupt other macros.
947 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
948 support deciding unguessable features based on the host and target types.
949 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
950 * AC_ARG_PROGRAM to use the options --program-prefix,
951 --program-suffix, and --program-transform-name to change the names
952 of programs being installed.
953 * AC_PREFIX_DEFAULT to change the default installation prefix.
954 * AC_TRY_COMPILE to compile a test program without linking it.
955 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
956 * AC_CHECK_LIB to check for a particular function and library.
957 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
958 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
959 * AC_SUBST_FILE to insert one file into another.
960 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
961 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
962 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
963 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
966 * Many macros renamed systematically, but old names are accepted for
967 backward compatibility.
968 * AC_OUTPUT adds the "automatically generated" comment to
969 non-Makefiles where it finds @configure_input@ in an input file, to
970 support files with various comment syntaxes.
971 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
972 files when they are not enclosed in @ signs.
973 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
974 override the file name "config.status".
975 * AC_OUTPUT takes an optional argument for passing variables from
976 configure to config.status.
977 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
978 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
979 CPPFLAGS, and LDFLAGS from the environment.
980 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
981 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
982 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
983 srcdir/../.. by default.
984 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
985 * AC_DEFINE no longer prints anything, because of the new result reporting
986 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
987 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
988 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
989 --enable- and --with- options.
990 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
991 execute on success or failure.
992 * Checking for C functions in C++ works.
995 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
996 better maintained with them.
997 * AC_ARG_ARRAY removed because no one was likely using it.
998 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
999 take arguments, for consistency with all of the other specific checks.
1002 * Comes with config.sub and config.guess, and uses them optionally.
1003 * Uses config.cache to cache test results. An alternate cache file
1004 can be selected with the --cache-file=FILE option.
1005 * Uses optional shell scripts $prefix/share/config.site and
1006 $prefix/etc/config.site to perform site or system specific initializations.
1007 * configure saves compiler output to ./config.log for debugging.
1008 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1009 * acsite.m4 is the new name for the system-wide aclocal.m4.
1010 * Has a DejaGnu test suite.
1012 Major changes in Autoconf 1.11:
1014 * AC_PROG_INSTALL calls install.sh with the -c option.
1015 * AC_SET_MAKE cleans up after itself.
1016 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1017 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1019 Plus a few other bug fixes.
1021 Major changes in Autoconf 1.10:
1023 * autoheader uses config.h.bot if present, analogous to config.h.top.
1024 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1026 * AC_PROG_CXX looks for cxx as a C++ compiler.
1028 Plus several bugs fixed.
1030 Major changes in Autoconf 1.9:
1032 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1033 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1034 and autoheader generates entries for those names automatically.
1035 * AC_FIND_X gets the result from xmkmf correctly.
1036 * AC_FIND_X assumes no X if --without-x was given.
1037 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1038 * AC_PROG_INSTALL finds OSF/1 installbsd.
1040 Major changes in Autoconf 1.8:
1043 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1044 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1045 for checking both C++ and C features in one configure script.
1046 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1047 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1048 AC_SET_MAKE, AC_ENABLE.
1051 * AC_FIND_X looks for X in more places.
1052 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1053 install.sh is distributed with Autoconf.
1054 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1055 a rewrite of quoting in AC_DEFINE.
1056 * AC_OUTPUT adds its comments in C format when substituting in C files.
1057 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1059 ** New or changed command line options:
1060 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1061 * configure accepts --without-PACKAGE, which sets withval=no.
1062 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1063 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1064 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1065 * configure accepts and ignores most other Cygnus configure options, and
1066 warns about unknown options.
1067 * config.status accepts --help, --version options.
1069 ** Paths and other changes:
1070 * Relative srcdir values are not made absolute.
1071 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1072 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1073 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1074 * The example Makefile dependencies for configure et al. work better.
1075 * Namespace cleanup: all shell variables used internally by Autoconf
1076 have names beginning with `ac_'.
1078 More big improvements are in process for future releases, but have not
1079 yet been (variously) finished, integrated, tested, or documented enough
1082 Major changes in Autoconf 1.7:
1084 * New macro AC_OBSOLETE.
1085 * Bugs in Makefile.in fixed.
1086 * AC_LONG_FILE_NAMES improved.
1088 Major changes in Autoconf 1.6:
1090 * New macro AC_LONG_64_BITS.
1091 * Multiple .h files can be created.
1092 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1093 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1094 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1095 * Unused --no-create option to configure removed.
1096 * autoheader doesn't change the timestamp of its output file if
1097 the file didn't change.
1098 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1099 * config.status checks three optional environment variables to
1100 modify its behavior.
1101 * The usual bug fixes.
1103 Major changes in Autoconf 1.5:
1105 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1106 * autoconf and autoheader scripts have GNU standards conforming
1107 --version and --help options (they print their message and exit).
1110 Major changes in Autoconf 1.4:
1112 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1113 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1114 * autoconf and autoheader use the M4 environment variable to determine the
1115 path of the m4 program to use.
1116 * The --macrodir option to autoconf and autoheader specifies the directory
1117 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1118 * autoconf and autoheader can take `-' as their file names, which means to
1119 read stdin as input.
1120 * Resulting configure scripts can take a --verbose option which causes them
1121 to print the results of their tests.
1122 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1123 shell characters, etc. will be preserved during various stages of
1124 expansion done by the shell. If you don't want this, use
1125 AC_DEFINE_UNQUOTED instead.
1126 * Much textual processing done with external calls to tr and sed have been
1127 internalized with builtin m4 `patsubst' and `translit' calls.
1128 * AC_OUTPUT doesn't hardwire the filenames it outputs. Instead, you can
1129 set the shell variables `gen_files' and `gen_config' to the list of
1130 filenames to output.
1131 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1132 "lex.yy" or "lexyy", depending on the system.
1133 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1135 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1136 * AC_CONST works much more reliably on more systems.
1139 Major changes in Autoconf 1.3:
1141 configure no longer requires awk for packages that use a config.h.
1142 Support handling --with-PACKAGE options.
1143 New `autoheader' script to create `config.h.in' from `configure.in'.
1144 Ignore troublesome -lucb and -lPW when searching for alloca.
1145 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1146 Improve detection of STDC library.
1147 Add AC_HAVE_LIBRARY to check for non-default libraries.
1148 Function checking should work with future GNU libc releases.
1150 Major changes in Autoconf 1.2:
1152 The --srcdir option is now usually unnecessary.
1153 Add a file containing sample comments describing CPP macros.
1154 A comment in config.status tells which host it was configured on.
1155 Substituted variable values can now contain commas.
1156 Fix bugs in various feature checks.
1158 Major changes in Autoconf 1.1:
1160 Added AC_STRCOLL macro.
1161 Made AC_GETLOADAVG check for more things.
1162 AC_OUTPUT argument is now optional.
1167 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003
1168 Free Software Foundation, Inc.
1170 This file is part of GNU Autoconf.
1172 GNU Autoconf is free software; you can redistribute it and/or modify
1173 it under the terms of the GNU General Public License as published by
1174 the Free Software Foundation; either version 2, or (at your option)
1177 GNU Autoconf is distributed in the hope that it will be useful,
1178 but WITHOUT ANY WARRANTY; without even the implied warranty of
1179 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1180 GNU General Public License for more details.
1182 You should have received a copy of the GNU General Public License
1183 along with GNU Autoconf; see the file COPYING. If not, write to
1184 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
1185 Boston, MA 02111-1307, USA.