1 * Major changes in Autoconf 2.60c (??)
3 * Major changes in Autoconf 2.60b (2006-10-22)
6 Autoconf-generated shell scripts no longer export BIN_SH, due to
7 configuration hassles with this. Installers who need BIN_SH in
8 their environment should set it before invoking 'configure' and
9 'make'. As far as we know, this affects only Unixware installations.
12 The documentation now says that the following macros are obsolescent,
13 as they are superseded by Gnulib:
15 AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
17 New programs should use the Gnulib counterparts of these macros.
18 We have no current plans to remove them from Autoconf.
20 ** AC_COMPUTE_INT no longer caches or reports results.
22 ** New macros AC_C_FLEXIBLE_ARRAY_MEMBER, AC_C_VARARRAYS.
24 ** AC_CHECK_DECL now also works with aggregate objects.
26 ** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
28 ** GNU M4 1.4.7 or later is now recommended.
31 New M4sugar macro, which is more secure than the POSIX M4 maketemp.
34 Now an alias for m4_mkstemp.
36 * Major changes in Autoconf 2.60a (2006-08-25)
38 ** GNU M4 1.4.6 or later is now recommended. At least one "make check"
39 test fails with earlier versions of M4.
41 ** The check for C99 now tests for varargs macros, as documented.
42 It also tests that the preprocessor supports 64-bit integers.
44 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
45 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
47 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
48 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
49 two macros are different, so autoupdate will not change the old private name
50 to the new one. _AC_COMPUTE_INT may be removed in a future release.
52 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
53 that long long types be at least 64 bits wide, as C99 and tradition
54 requires. Formerly, they accepted implementations of any width.
57 * Major changes in Autoconf 2.60
59 Released 2006-06-23, by Ralf Wildenhues.
61 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
62 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
63 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
65 ** Provide a way to turn off warnings about the changed directory variables.
67 * Major changes in Autoconf 2.59d
69 Released 2006-06-05, by Ralf Wildenhues.
71 ** GNU make now recommended for VPATH builds
72 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
73 only if you use GNU make. In practice, other 'make' implementations
74 have too many subtle incompatibilities in their support for VPATH.
75 Many packages (including Autoconf itself) are portable to other
76 'make' implementations, but some packages are not, and recommending
77 GNU make keeps the installation instructions simpler.
79 ** Even more safety checks for the new Directory variables:
80 Warn about suspicious `${datarootdir}' found in config files output.
82 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
83 These never-documented macros and variables have been marked with
84 comments saying that they may be removed in a future release,
85 because their use can lead to unintended code being executed.
86 If you need functionality that only these macros or variables
87 currently supply, please write bug-autoconf@gnu.org.
89 ** AC_SUBST, AC_DEFINE
90 Literal arguments to these are passed to m4_pattern_allow now.
93 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
94 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
95 obsolete K&R tests in the Automake test suite.
104 Now more robust with special characters in file names, or when
105 multiple processes create the same directory at the same time.
107 ** Obsolescent macros
108 The documentation now says that the following macros are obsolescent:
109 they test for problems that are so old that they are no longer of
110 practical importance on current systems.
112 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
113 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
114 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
115 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
116 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
117 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
118 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
119 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
121 New programs need not use these macros. We have no current plans to
125 For compatibility with future Libtool 2.0, autoreconf will invoke
126 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
129 * Major changes in Autoconf 2.59c
131 Released 2006-04-12, by Ralf Wildenhues.
133 ** The configure command now redirects standard input from /dev/null,
134 to help avoid problems with subsidiary commands that might mistakenly
135 read standard input. AS_ORIGINAL_STDIN_FD points to the original
136 standard input before this redirection, if you really want configure to
137 read from standard input.
139 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
140 The following directory variables are new:
142 datarootdir read-only architecture-independent data root [PREFIX/share]
143 localedir locale-specific message catalogs [DATAROOTDIR/locale]
144 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
145 htmldir html documentation [DOCDIR]
146 dvidir dvi documentation [DOCDIR]
147 pdfdir pdf documentation [DOCDIR]
148 psdir ps documentation [DOCDIR]
150 The following variables have new default values:
152 datadir read-only architecture-independent data [DATAROOTDIR]
153 infodir info documentation [DATAROOTDIR/info]
154 mandir man documentation [DATAROOTDIR/man]
156 This means that if you use any of `@datadir@', `@infodir@', or
157 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
158 defined in this file. As a temporary measure, if any of those are
159 found but no mention of `datarootdir', the substitutions will be
160 replaced with values that do not contain `${datarootdir}', and a
161 warning will be issued.
163 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
164 a trailing slash. Similar change will be made to ac_top_builddir in a
165 future release; the old style value, which matches (../)*, is (and will
166 continue to be) available as ac_top_build_prefix.
169 New macro to check for support of 'typeof' syntax a la GNU C.
171 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
172 New "once-only" variants of commonly-used macros, to make 'configure'
173 smaller and faster in common cases.
176 New macro to check for strtold with C99 semantics.
179 New macro that lets builder disable assertions at 'configure'-time.
182 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
183 X11/Intrinsic.h and XtMalloc (Xt).
185 ** AC_PRESERVE_HELP_ORDER
186 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
187 and AC_ARG_WITH arguments in one region, in the order defined. The default
188 behavior is to group options of each classes separately.
190 ** AC_PROG_CC, AC_PROG_CXX
191 No longer automatically arrange to declare the 'exit' function of C,
192 when a C++ compiler is used. Standard Autoconf macros no longer use
193 'exit', so this is no longer an issue for them. If you use C++, and
194 want to call 'exit', you'll have to arrange for its declaration
195 yourself. But we now suggest you return from 'main' instead.
197 ** AC_PROG_CC_C89, AC_PROG_CC_C99
198 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
199 check for ANSI C89 and ISO C99 support respectively.
202 Has been unobsoleted, and will check if the compiler supports ISO
203 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
204 retained for backwards compatibility, assuming the value of
205 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
208 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
209 New macros for checking commonly-used members of struct dirent.
212 The substituted value can now contain newlines.
215 The substitution now occurs only when @variable@ is on a line by itself,
216 optionally surrounded by spaces and tabs. The whole line is replaced.
218 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
219 New macros to check for long double, and whether it is wider than double.
220 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
221 applications should switch to the new macro.
223 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
224 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
225 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
226 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
227 New macros to check for C99 and POSIX types.
229 ** AC_USE_SYSTEM_EXTENSIONS
230 New macro to enable extensions to Posix.
233 New macro which is defined to the name of the first declared config header
234 or undefined if no config headers have been declared yet.
237 The macro correctly handles quadrigraphs now.
239 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
240 These macros are new or published now.
243 New macro for copyright notices in testsuite files.
245 ** ALLOCA, LIBOBJS, LTLIBOBJS
246 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
247 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
248 `Makefile.in' in case the object files lie in a different directory.
249 The LIBOBJDIR feature is experimental.
252 Supports --no-recursive now.
254 ** New macros to support Erlang/OTP.
255 New macros for configuring paths to Erlang tools and libraries:
256 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
257 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
258 AC_ERLANG_SUBST_LIB_DIR.
260 New macros for configuring installation of Erlang libraries:
261 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
263 ** The manual now mentions Gnulib more prominently.
265 ** New macros to support Objective C.
266 AC_PROG_OBJC, AC_PROG_OBJCPP.
268 * Major changes in Autoconf 2.59b
270 Released 2004-08-20, by Paul Eggert.
273 New macro that computes the default alignment of a type.
275 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
276 When cross-compiling, these macros will give a warning if the tool
277 is not prefixed. In the future, unprefixed cross tools will not
278 be detected; please consult the info documentation for information
279 about the reason of this change.
281 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
282 New macros that detect programs whose name is prefixed with the
283 target type, if the build type and target type are different.
285 ** AC_REQUIRE_AUX_FILE
286 New trace macro that declares expected auxiliary files.
289 New macro that tests for a grep program that accepts as a long a line
292 ** AC_PROG_EGREP, AC_PROG_FGREP
293 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
294 FGREP="$GREP -F" respectively if possible, or else run a path search for
295 a program that accepts as long a line as possible.
298 New macro that tests for a sed program that truncates as few characters
301 * Major changes in Autoconf 2.59
303 Released 2003-11-04, by Akim Demaille
305 ** ac_abs_builddir etc.
306 Absolute file names were actually relative in 2.58.
308 * Major changes in Autoconf 2.58
310 Released 2003-11-04, by Akim Demaille
313 core.* files are no longer removed, as they may be valid user files.
315 ** autoreconf and auxiliary directory
316 Autoreconf creates the auxiliary directory if needed. This is
317 especially useful for initial "bootstrapping" of fresh CVS checkouts.
319 ** AC_CONFIG_MACRO_DIR
320 Use this macro to declare the directory for local M4 macros for aclocal.
323 No longer includes twice the same file in LIBOBJS if invoked
326 ** AC_CONFIG_COMMANDS
327 The directory for its first argument is automatically created. For
330 AC_CONFIG_COMMANDS([src/modules.hh], [...])
332 $top_builddir/src/ is created if needed.
334 ** Autotest and local.at
335 The optional file local.at is always included in Autotest test suites.
338 The warnings are always issued, including with cached runs.
339 This became a significant problem since aclocal and automake can
340 run autoconf behind the scene.
342 ** autoheader warnings
343 The warnings of autoheader can be turned off, using --warning.
344 For instance, -Wno-obsolete disables the complaints about acconfig.h
345 and other deprecated constructs.
348 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
351 ** AC_DECL_SYS_SIGLIST
355 Now checks that mktime is the inverse of localtime.
357 ** Improve DJGPP portability
358 The Autoconf tools and configure behave better under DJGPP.
360 ** Present But Cannot Be Compiled
361 New FAQ section dedicated to the mystic
363 configure: WARNING: pi.h: present but cannot be compiled
364 configure: WARNING: pi.h: check for missing prerequisite headers?
365 configure: WARNING: pi.h: proceeding with the preprocessor's result
368 ** Concurrent executions of autom4te
369 autom4te now locks its internal files, which enables concurrent
370 executions of autom4te, likely to happen if automake, autoconf,
371 autoheader etc. are run simultaneously.
374 Use of Libtool 1.5 and higher is encouraged. Compatibility with
375 Libtool pre-1.4 is not checked.
378 Testsuites no longer rerun failed tests in verbose mode; instead,
379 failures are logged while the test is run.
381 In addition, expected failures can be marked as such.
383 * Major changes in Autoconf 2.57
385 Released 2002-12-03 by Paul Eggert.
387 Bug fixes for problems with AIX linker, with freestanding C compilers,
388 with GNU M4 limitations, and with obsolete copies of GNU documents.
390 The Free Documentation License has been upgraded from 1.1 to 1.2.
392 * Major changes in Autoconf 2.56
394 Released 2002-11-15 by Akim Demaille.
396 One packaging problem fixed (config/install-sh was not executable).
398 * Major changes in Autoconf 2.55
400 Released 2002-11-14 by Akim Demaille.
404 Have your configure.ac checked by autoscan ("autoscan").
405 Try the warning options ("autoreconf -fv -Wall").
409 - AC_CHECK_HEADER, AC_CHECK_HEADERS
410 More information on proper use.
412 - Writing Test Programs
414 This sections explains how to write good test sources to use with
415 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
417 - AC_FOO_IFELSE vs. AC_TRY_FOO
419 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
420 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
424 - Is more robust to different Gettext installations.
426 - Produces messages (when --verbose) to be understood by Emacs'
429 - Supports -W/--warnings.
432 Once the GNU Build System reinstalled, run `./config.status
433 --recheck && ./config.status && make' if possible.
437 - Supports --cache, and --no-cache.
439 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
440 (autom4te.cache). See `Customizing autom4te' in the documentation.
447 Support for the obsoleted options -m, --macrodir, -l, --localdir is
448 dropped in favor of the safer --include/--prepend-include scheme.
453 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
454 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
455 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
458 Obsoleted macros are kept for Autoconf backward compatibility, but
459 should be avoided in configure.ac. Running autoupdate is advised.
462 - AC_DEFINE/AC_DEFINE_UNQUOTED
464 We have to stop using the old compatibility scheme --that tried to
465 avoid useless backslashes-- because Libtool 1.4.3 contains a
467 AC_DEFINE([error_t], [int],
468 [Define to a type to use for \`error_t' if it is not
469 otherwise available.])
471 We have to quote the single quotes and backslashes with \. The old
472 compatibility scheme saw that ` was backslashed, and therefore did
473 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
474 compatible with Libtool. Autoconf 2.55 is, but in some cases might
475 produce more \ than wanted.
477 Please, note that in the future the same problem will happen with
478 AC_MSG_*: use `autoreconf -f -Wall'.
482 - Portability of the Autoconf package to Solaris.
484 - Spurious warnings caused by config.status.
485 This bug is benign, but painful: on some systems (typically
486 FreeBSD), warnings such as:
488 config.status: creating Makefile
489 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
491 could be issued. This is fixed.
494 Simultaneous executions of config.status are possible again.
496 - Precious variables accumulation
498 config.status could stack several copies of the precious variables
502 ** Plans for later versions
506 The compatibility hooks with the old scheme will be completely
507 removed. Please, advice/use `--build', `--host', and `--target'
510 - AC_CHECK_HEADER, AC_CHECK_HEADERS
512 The tests will be stricter, please make sure your invocations are
517 Shell functions will gradually be introduced, probably starting with
518 Autotest. If you know machines which are in use that you suspect
519 *not* to support shell functions, please run the test suite of
520 Autoconf 2.55 on it, and report the results to
521 bug-autoconf@gnu.org.
525 Special characters in AC_MSG_* need not be quoted. Currently,
526 Autoconf has heuristics to decide when a string is escaped, or has
527 to be escaped. This scheme is fragile, and will be removed; the
528 only risk is uglified messages. Please, run `autoreconf -f -Wall'
529 to find occurrences that will be affected.
531 * Major changes in Autoconf 2.54
533 Released 2002-09-13 by Akim Demaille.
537 - autoreconf no longer changes the version of the gettext/po/intl
538 support files. It now adds the files the correspond to the
539 AM_GNU_GETTEXT_VERSION declared in configure.ac.
541 Warning: It now relies on the 'autopoint' program, which is part
542 of GNU gettext 0.11.4 and newer.
544 Please note that you need to have a GNU gettext version that
545 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
546 in configure.ac. You can upgrade to newer GNU gettext versions,
547 though, without needing to change configure.ac.
549 - The -I DIR or --include=DIR option now appends DIR to the include path
550 instead of prepending; this is for consistency with other GNU tools.
551 The new -B DIR or --prepend-include=DIR option has the old behavior.
556 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
557 Please, remove lines such as
559 # This is necessary so that .o files in LIBOBJS are also
560 # built via the ANSI2KNR-filtering rules.
561 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
563 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
564 your Makefiles either.
566 - AC_CONFIG_LINKS now makes copies if it can't make links.
568 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
569 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
570 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
572 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
574 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
576 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
580 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
581 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
582 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
585 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
588 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
589 for an AC_LIBOBJ replacement.
593 - Spurious complaints from `m4_bmatch' about invalid regular
594 expressions are suppressed.
596 - Empty top_builddirs are properly handled.
598 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
601 Now colon in the optional path arguments are properly handled.
603 ** Improved portability
605 - Both Autoconf the package, and the scripts it produces, should run
606 more reliably with Zsh. Bear in mind it is the default Bourne shell
609 - Autoconf and the scripts it produces no longer assume the existence of
610 the obsolescent commands egrep and fgrep.
614 - Limitations of Make
618 The GNATS base moved to
619 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
620 (It is no longer available, though.)
625 Now contains the list of ouput variables and files (AC_SUBST,
628 * Major changes in Autoconf 2.53
630 Released 2002-03-08 by Akim Demaille.
634 Perl 5.005_03 or later is required: autom4te is written in Perl and is
635 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
641 Argument requirements, output variables, defined macros.
642 - M4sugar, M4sh, Autotest
644 - Double quoting macros
645 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
647 The Autoconf manual is now distributed under the terms of the GNU FDL.
648 - Section `Hosts and Cross-Compilation'
649 Explains the rationale for the 2.5x changes in the cross-compilation
650 chain, and in the relationships between build, host, and target
652 Emphasizes that `cross-compilation' == `--host is given'.
653 If you are working on compilers etc., be sure to read this section.
654 - Section `AC_LIBOBJ vs. LIBOBJS'
655 Explains why assigning LIBOBJS directly is now an error.
656 Details how to update the code.
661 Now used instead of hard coded line numbers.
662 This eases the comparison of `configure's, and diminishes the
663 pressure over control version archives.
664 Automatic replacement for shells that don't support this feature.
665 - New output variables
666 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
671 Autoconf and Autotest modes are provided.
676 New, used by the Autoconf suite to cache and speed up most processing.
678 Supported by autom4te, autoconf and autoheader.
680 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
681 autoupdate, and autoreconf.
683 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
684 automake options are to be given via AUTOMAKE_OPTIONS.
686 Runs gettextize and libtoolize when appropriate.
688 --m4dir is no longer supported.
690 Now runs only in the specified directories, defaulting to `.',
691 but understands AC_CONFIG_SUBDIRS for dependent directories.
692 Before, it used to run on all the `configure.ac' found in the
694 Independent packages are properly updated.
698 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
700 Under the user pressure, $? is finally available. Probably a mistake.
701 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
702 - Precious variables accumulation
703 config.status could stack several copies of the precious variables
705 - AC_PATH_PROG and family.
706 Works properly when given a literal path.
708 Somewhere since 2.13, the result had been reversed.
712 - AC_C_BIGENDIAN supports the cross-compiling case.
713 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
714 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
715 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
717 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
718 precision than `double'.
723 It now defines the preprocessor symbols PACKAGE_NAME,
724 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
728 Admits a fourth optional parameter: the tar name.
730 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
731 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
732 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
735 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
736 Are much less expensive when using long lists of files.
739 Works with shell variables, and non alphanumeric names.
743 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
744 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
746 - AC_FUNC_STRTOD substitutes POW_LIB.
751 * Major changes in Autoconf 2.52
753 Released 2001-07-18 by Akim Demaille.
758 This feature was present in autoconf 2.50 but was not documented.
759 For example, `@<:@' is translated to `[' just before output. This
760 is useful when writing strings that contain unbalanced quotes, or
761 other hard-to-quote constructs.
762 - m4_pattern_forbid, m4_pattern_allow
763 - Tips for upgrading from 2.13.
764 - Using autoscan to maintain a configure.ac.
767 - Now include stdint.h.
768 - sys/types.h and sys/stat.h are guarded.
769 - strings.h is included if available, and not conflicting with string.h.
772 - The test suite is more robust and presents less false failures.
773 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
774 - configure accepts --prefix='' again.
775 - AC_CHECK_LIB works properly when its first argument is not a
777 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
778 - build_, host_, and target_alias are AC_SUBST as in 2.13.
779 - AC_ARG_VAR properly propagates precious variables inherited from the
780 environment to ./config.status.
781 - Using --program-suffix/--program-prefix is portable.
782 - Failures to detect the default compiler's output extension are less
784 - `config.status foo' works properly when `foo' depends on variables
785 set in an AC_CONFIG_THING INIT-CMD.
786 - autoheader is more robust to broken input.
787 - Fixed Fortran name-mangling and link tests on a number of systems,
788 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
791 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
792 specify pre-includes. In this case, the headers are compiled with
793 cc, not merely preprocessed by cpp. Therefore it is the _usability_
794 of a header which is checked for, not just its availability.
795 - AC_ARG_VAR refuses to run configure when precious variables have
797 - Versions of compilers are dumped in the logs.
798 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
801 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
802 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
803 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
804 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
805 Be sure to read `Upgrading from Version 2.13' to understand why
806 running `autoupdate' is needed.
807 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
808 a main-like routine is required/possible when linking C/C++ with
809 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
810 - AC_FUNC_GETPGRG behaves better when cross-compiling.
812 * Major changes in Autoconf 2.51
813 There was no release of Autoconf 2.51 since some packagers had used
814 this version number without permission to ship intermediary versions
815 of 2.50. The version was skipped to avoid confusion.
817 * Major changes in Autoconf 2.50
819 Released 2001-05-21 by Akim Demaille.
822 There have been far too many to enumerate them here. Check out
823 ChangeLog if you really want to know more.
825 ** Improved documentation
826 In particular, portability issues are better covered.
829 All the standard GNU Makefile targets are supported. The layout has
830 changed: m4/ holds the M4 extensions Autoconf needs for its
831 configuration, doc/ contains the documentation, and tests/ contains
834 ** Man pages are provided
835 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
836 config.guess, config.sub.
840 Provides a safe and powerful means to trace the macro uses. This
841 provide the parsing layer for tools which need to `study'
845 Specify what category of warnings should be enabled.
847 - When recursing into subdirectories, try for configure.gnu before
848 configure to adapt for packages not using autoconf on case-insensitive
852 More errors are now caught (circular AC_REQUIRE dependencies,
853 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
854 etc.). In addition, their location and call stack are given.
857 autoupdate is much more powerful, and is able to provide the glue code
858 which might be needed to move from an old macro to its newer
861 You are strongly encouraged to use it to modernize both your
862 `configure.in' and your .m4 extension files.
865 The internal machinery of autoheader has completely changed. As a
866 result, using `acconfig.h' should be considered to be obsoleted, and
867 you are encouraged to get rid of it using the AH macros.
872 ** Fortran 77 compilers
873 Globally, the support for Fortran 77 is considerably improved.
875 Support for automatically determining a Fortran 77 compiler's
876 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
877 provided to wrap C/C++ identifiers, thus making it easier and more
878 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
879 call C/C++ routines. See the Texinfo documentation for details.
882 The test suite no longer uses DejaGNU. It should be easy to submit
883 test cases in this new framework.
886 - --help, --help=long, -hl
887 no longer dumps useless items.
889 lists only specific options.
890 - --help=recursive, -hr
891 displays the help of all the embedded packages.
892 - Remembers environment variables when reconfiguring.
893 The previous scheme to set envvar before running configure was
895 what prevented configure from remembering the environment in which
896 it was run, therefore --recheck was run in an inconsistent
897 environment. Now, one should run
899 and then --recheck will work properly. Variables declared with
900 AC_ARG_VAR are also preserved.
902 $build defaults to `config.guess`, $host to $build, and then $target
904 Cross-compilation is a global status of the package, it no longer
905 depends upon the current language.
906 Cross compilation is enabled iff the user specified `--host'.
907 `configure' now fails if it can't run the executables it compiles,
908 unless cross-compilation is enabled.
910 The cache file is disabled by default. The new options
911 `--config-cache', `-C' set the cache to `config.cache'.
915 Much faster on most architectures.
916 - concurrent executions
917 It is safe to use `make -j' with config.status.
918 - human interface improved
919 It is possible to invoke
920 ./config.status foobar
921 instead of the former form (still valid)
922 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
923 CONFIG_FILES=foobar:foo.in:bar.in \
925 The same holds for configuration headers and links.
926 You can instantiate unknown files and headers:
927 ./config.status --header foo.h:foo.h.in --file bar:baz
928 - has a useful --help
929 - accepts special file name "-" for stdin/stdout
934 Specify additional copyright information.
937 Now expects the identity of the package as argument.
941 Most macros, if not all, now strictly follow the `one quotation
942 level' rule. This results in a more predictable expansion.
945 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
946 configure scripts, was fixed by Axel Thimm.
950 Document and ask for the registration of an envvar.
953 Specifies the file which `configure' should look for when trying to
954 find the source tree (used to be handled by AC_INIT).
957 To add new actions to config.status. Should be used instead of
961 Replaces AC_LINK_FILES.
963 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
964 AC_CONFIG_LINKS, and AC_CONFIG_FILES
965 They now obey sh: you should no longer use shell variables as
968 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
969 AC_CONFIG_SUBDIRS($my_subdirs)
973 if test "$package_foo_enabled" = yes; then
974 AC_CONFIG_SUBDIRS(foo)
978 To format an Autoconf macro's help string so that it looks pretty
979 when the user executes `configure --help'.
982 ** Generic Test Macros
984 The interface of the AC_CHECK families of macros (decl, header,
985 type, member, func) is now uniform. They support the same set of
988 - AC_CHECK_DECL, AC_CHECK_DECLS
989 To check whether a symbol is declared.
991 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
992 No longer need a cross-compilation default.
995 The test it performs is much more robust than previously, and makes
996 it possible to test builtin types in addition to typedefs.
997 It is now schizophrenic:
998 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
999 remains for backward compatibility, but its use is discouraged.
1000 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
1001 behaves exactly like the other AC_CHECK macros.
1004 Checks whether given types are supported by the system.
1006 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
1007 Check for given members in aggregates (e.g., pw_gecos in struct
1011 Checks if the compiler supports ISO C, included when needs special
1015 Checking whether the preprocessor indicates missing includes by the
1016 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1019 Takes a language as argument and replaces AC_LANG_C,
1020 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1022 - AC_LANG_PUSH, AC_LANG_POP
1023 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1026 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1027 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1028 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1032 Sets GETGROUPS_LIBS.
1034 - AC_FUNC_GETLOADAVG
1035 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1038 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1041 Arrange for large-file support.
1043 - AC_EXEEXT, AC_OBJEXT
1044 You are no longer expected to use them: their computation is
1045 performed by default.
1047 ** C++ compatibility
1048 Every macro has been revisited in order to support at best CC=c++.
1050 Major changes in Autoconf 2.14:
1051 There was no release of GNU Autoconf 2.14.
1053 Major changes in Autoconf 2.13:
1055 Released 1999-05-01 by Ben Elliston.
1057 * Support for building on Win32 systems where the only available C or
1058 C++ compiler is the Microsoft Visual C++ command line compiler
1059 (`cl'). Additional support for building on Win32 systems which are
1060 using the Cygwin or Mingw32 environments.
1061 * Support for alternative object file and executable file extensions.
1062 On Win32, for example, these are .obj and .exe. These are discovered
1063 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1064 @EXEEXT@ in the output, respectively.
1065 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1066 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1067 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1068 * AC_DEFINE now has an optional third argument for a description to be
1069 placed in the config header input file (e.g. config.h.in).
1070 * The C++ code fragment compiled for the C++ compiler test had to be
1071 improved to include an explicit return type for main(). This was
1072 causing failures on systems using recent versions of the EGCS C++
1074 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1075 script to report that `sometype_t' was present when only `type_t'
1077 * Merge of the FSF version of config.guess and config.sub to modernize
1078 these scripts. Add support for a few new hosts in config.guess.
1079 Incorporate latest versions of install-sh, mkinstalldirs and
1080 texinfo.tex from the FSF.
1081 * autoreconf is capable of running automake if necessary (and
1083 * Support for Fortran 77. See the Texinfo documentation for details.
1084 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1086 Major changes in Autoconf 2.12:
1088 Released 1996-11-26 by David J. MacKenzie
1090 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1091 concatenating multiple input files separated by colons, like so:
1092 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1093 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1094 The arguments may be shell variables, to compute the lists on the fly.
1095 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1096 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1099 Major changes in Autoconf 2.11:
1101 Released November 18th, 1996, by David J. MacKenzie
1103 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1104 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1105 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1106 * AC_CONFIG_HEADER expands shell variables in its argument.
1107 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1108 * The "checking..." messages and the source code for test programs that
1109 fail are saved in config.log.
1110 * Another workaround has been added for seds with small command length limits.
1111 * config.sub and config.guess recognize more system types.
1114 Major changes in Autoconf 2.10:
1116 Released May 7th, 1996, by Roland McGrath
1119 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1120 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1122 Major changes in Autoconf 2.9:
1124 Released March 16th, 1996, by Roland McGrath
1128 Major changes in Autoconf 2.8:
1130 Released March 8th, 1996, by Roland McGrath
1134 Major changes in Autoconf 2.7:
1136 Released November 22nd, 1995, by David J. MacKenzie
1140 Major changes in Autoconf 2.6:
1142 Released November 20th, 1995, by David J. MacKenzie
1146 Major changes in Autoconf 2.5:
1148 Released November 17th, 1995, by Roland McGrath
1150 * New configure options --bindir, --libdir, --datadir, etc., with
1151 corresponding output variables.
1152 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1153 * config.log contains the command being run as well as any output from it.
1154 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1155 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1156 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1157 AC_CHECK_TOOL can search a path other than $PATH.
1158 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1160 Major changes in Autoconf 2.4:
1162 Released June 14th, 1995, by David J. MacKenzie
1164 * Fix a few bugs found by Emacs testers.
1166 Major changes in Autoconf 2.3:
1168 Released March 27th, 1995, by David J. MacKenzie
1170 * Fix the cleanup trap in several ways.
1171 * Handle C compilers that are picky about option placement.
1172 * ifnames gets the version number from the right directory.
1174 Major changes in Autoconf 2.2:
1176 Released March 8th, 1995, by David J. MacKenzie
1178 * The ifnames utility is much faster but requires a "new awk" interpreter.
1179 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1180 library before existing libs, not after, in case it uses them.
1181 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1182 * Lots of bug fixes.
1183 * Many additions to the TODO file :-)
1185 Major changes in Autoconf 2.1:
1187 Released November 4th, 1994, by David J. MacKenzie
1190 * More explanations in the manual.
1191 * Fix a spurious failure in the testsuite.
1192 * Clarify some warning messages.
1193 * autoreconf by default only rebuilds configure and config.h.in files
1194 that are older than any of their particular input files; there is a
1195 --force option to use after installing a new version of Autoconf.
1197 Thanks to everybody who's submitted changes and additions to Autoconf!
1198 I've incorporated many of them, and am still considering others for
1199 future releases -- but I didn't want to postpone this release indefinitely.
1201 Caution: don't indiscriminately rebuild configure scripts with
1202 Autoconf version 2. Some configure.in files need minor adjustments to
1203 work with it; the documentation has a chapter on upgrading. A few
1204 configure.in files, including those for GNU Emacs and the GNU C
1205 Library, need major changes because they relied on undocumented
1206 internals of version 1. Future releases of those packages will have
1207 updated configure.in files.
1209 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1210 Autoconf now makes heavy use of M4 diversions, which were implemented
1211 inefficiently in GNU M4 releases before 1.3.
1213 Major changes in Autoconf 2.0:
1215 Released October 26th, 1994, by David J. MacKenzie
1217 ** New copyright terms:
1218 * There are no restrictions on distribution or use of configure scripts.
1221 * Autoconf manual is reorganized to make information easier to find
1222 and has several new indexes.
1223 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1226 * autoscan to generate a preliminary configure.in for a package by
1227 scanning its source code for commonly used nonportable functions,
1228 programs, and header files.
1229 * ifnames to list the symbols used in #if and #ifdef directives in a
1231 * autoupdate to update a configure.in to use the version 2 macro names.
1232 * autoreconf to recursively remake configure and configuration header
1233 files in a source tree.
1235 ** Changed utilities:
1236 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1237 * autoconf and autoheader can look for package-local definition files
1238 in an alternate directory.
1241 * AC_CACHE_VAL to share results of tests between configure runs.
1242 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1243 that macros invoked with AC_REQUIRE don't interrupt other macros.
1244 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1245 support deciding unguessable features based on the host and target types.
1246 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1247 * AC_ARG_PROGRAM to use the options --program-prefix,
1248 --program-suffix, and --program-transform-name to change the names
1249 of programs being installed.
1250 * AC_PREFIX_DEFAULT to change the default installation prefix.
1251 * AC_TRY_COMPILE to compile a test program without linking it.
1252 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1253 * AC_CHECK_LIB to check for a particular function and library.
1254 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1255 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1256 * AC_SUBST_FILE to insert one file into another.
1257 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1258 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1259 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1260 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1263 * Many macros renamed systematically, but old names are accepted for
1264 backward compatibility.
1265 * AC_OUTPUT adds the "automatically generated" comment to
1266 non-Makefiles where it finds @configure_input@ in an input file, to
1267 support files with various comment syntaxes.
1268 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1269 files when they are not enclosed in @ signs.
1270 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1271 override the file name "config.status".
1272 * AC_OUTPUT takes an optional argument for passing variables from
1273 configure to config.status.
1274 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1275 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1276 CPPFLAGS, and LDFLAGS from the environment.
1277 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1278 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1279 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1280 srcdir/../.. by default.
1281 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1282 * AC_DEFINE no longer prints anything, because of the new result reporting
1283 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1284 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1285 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1286 --enable- and --with- options.
1287 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1288 execute on success or failure.
1289 * Checking for C functions in C++ works.
1292 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1293 better maintained with them.
1294 * AC_ARG_ARRAY removed because no one was likely using it.
1295 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1296 take arguments, for consistency with all of the other specific checks.
1299 * Comes with config.sub and config.guess, and uses them optionally.
1300 * Uses config.cache to cache test results. An alternate cache file
1301 can be selected with the --cache-file=FILE option.
1302 * Uses optional shell scripts $prefix/share/config.site and
1303 $prefix/etc/config.site to perform site or system specific initializations.
1304 * configure saves compiler output to ./config.log for debugging.
1305 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1306 * acsite.m4 is the new name for the system-wide aclocal.m4.
1307 * Has a DejaGnu test suite.
1309 Major changes in Autoconf 1.11:
1311 * AC_PROG_INSTALL calls install.sh with the -c option.
1312 * AC_SET_MAKE cleans up after itself.
1313 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1314 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1316 Plus a few other bug fixes.
1318 Major changes in Autoconf 1.10:
1320 * autoheader uses config.h.bot if present, analogous to config.h.top.
1321 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1323 * AC_PROG_CXX looks for cxx as a C++ compiler.
1325 Plus several bugs fixed.
1327 Major changes in Autoconf 1.9:
1329 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1330 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1331 and autoheader generates entries for those names automatically.
1332 * AC_FIND_X gets the result from xmkmf correctly.
1333 * AC_FIND_X assumes no X if --without-x was given.
1334 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1335 * AC_PROG_INSTALL finds OSF/1 installbsd.
1337 Major changes in Autoconf 1.8:
1340 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1341 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1342 for checking both C++ and C features in one configure script.
1343 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1344 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1345 AC_SET_MAKE, AC_ENABLE.
1348 * AC_FIND_X looks for X in more places.
1349 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1350 install.sh is distributed with Autoconf.
1351 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1352 a rewrite of quoting in AC_DEFINE.
1353 * AC_OUTPUT adds its comments in C format when substituting in C files.
1354 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1356 ** New or changed command line options:
1357 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1358 * configure accepts --without-PACKAGE, which sets withval=no.
1359 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1360 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1361 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1362 * configure accepts and ignores most other Cygnus configure options, and
1363 warns about unknown options.
1364 * config.status accepts --help, --version options.
1366 ** File names and other changes:
1367 * Relative srcdir values are not made absolute.
1368 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1369 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1370 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1371 * The example Makefile dependencies for configure et al. work better.
1372 * Namespace cleanup: all shell variables used internally by Autoconf
1373 have names beginning with `ac_'.
1375 More big improvements are in process for future releases, but have not
1376 yet been (variously) finished, integrated, tested, or documented enough
1379 Major changes in Autoconf 1.7:
1381 * New macro AC_OBSOLETE.
1382 * Bugs in Makefile.in fixed.
1383 * AC_LONG_FILE_NAMES improved.
1385 Major changes in Autoconf 1.6:
1387 * New macro AC_LONG_64_BITS.
1388 * Multiple .h files can be created.
1389 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1390 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1391 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1392 * Unused --no-create option to configure removed.
1393 * autoheader doesn't change the timestamp of its output file if
1394 the file didn't change.
1395 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1396 * config.status checks three optional environment variables to
1397 modify its behavior.
1398 * The usual bug fixes.
1400 Major changes in Autoconf 1.5:
1402 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1403 * autoconf and autoheader scripts have GNU standards conforming
1404 --version and --help options (they print their message and exit).
1407 Major changes in Autoconf 1.4:
1409 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1410 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1411 * autoconf and autoheader use the M4 environment variable to determine the
1412 name of the M4 program to use.
1413 * The --macrodir option to autoconf and autoheader specifies the directory
1414 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1415 * autoconf and autoheader can take `-' as their file names, which means to
1416 read stdin as input.
1417 * Resulting configure scripts can take a --verbose option which causes them
1418 to print the results of their tests.
1419 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1420 shell characters, etc. will be preserved during various stages of
1421 expansion done by the shell. If you don't want this, use
1422 AC_DEFINE_UNQUOTED instead.
1423 * Much textual processing done with external calls to tr and sed have been
1424 internalized with builtin M4 `patsubst' and `translit' calls.
1425 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1426 set the shell variables `gen_files' and `gen_config' to the list of
1427 file names to output.
1428 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1429 "lex.yy" or "lexyy", depending on the system.
1430 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1432 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1433 * AC_CONST works much more reliably on more systems.
1436 Major changes in Autoconf 1.3:
1438 configure no longer requires awk for packages that use a config.h.
1439 Support handling --with-PACKAGE options.
1440 New `autoheader' script to create `config.h.in' from `configure.in'.
1441 Ignore troublesome -lucb and -lPW when searching for alloca.
1442 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1443 Improve detection of STDC library.
1444 Add AC_HAVE_LIBRARY to check for non-default libraries.
1445 Function checking should work with future GNU libc releases.
1447 Major changes in Autoconf 1.2:
1449 The --srcdir option is now usually unnecessary.
1450 Add a file containing sample comments describing CPP macros.
1451 A comment in config.status tells which host it was configured on.
1452 Substituted variable values can now contain commas.
1453 Fix bugs in various feature checks.
1455 Major changes in Autoconf 1.1:
1457 Added AC_STRCOLL macro.
1458 Made AC_GETLOADAVG check for more things.
1459 AC_OUTPUT argument is now optional.
1464 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1465 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1467 This file is part of GNU Autoconf.
1469 GNU Autoconf is free software; you can redistribute it and/or modify
1470 it under the terms of the GNU General Public License as published by
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