1 * Major changes in Autoconf 2.59d
3 ** ac_config_guess, ac_config_sub, ac_configure
4 These never-documented variables have been marked with a comment
5 saying that we intend to remove them in a future release.
8 Literal arguments to these are passed to m4_pattern_allow now.
11 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
12 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
13 obsolete K&R tests in the Automake test suite.
22 Now more robust with special characters in file names, or when
23 multiple processes create the same directory at the same time.
25 * Major changes in Autoconf 2.59c
27 Released 2006-04-12, by Ralf Wildenhues.
29 ** The configure command now redirects standard input from /dev/null,
30 to help avoid problems with subsidiary commands that might mistakenly
31 read standard input. AS_ORIGINAL_STDIN_FD points to the original
32 standard input before this redirection, if you really want configure to
33 read from standard input.
35 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
36 The following directory variables are new:
38 datarootdir read-only architecture-independent data root [PREFIX/share]
39 localedir locale-specific message catalogs [DATAROOTDIR/locale]
40 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
41 htmldir html documentation [DOCDIR]
42 dvidir dvi documentation [DOCDIR]
43 pdfdir pdf documentation [DOCDIR]
44 psdir ps documentation [DOCDIR]
46 The following variables have new default values:
48 datadir read-only architecture-independent data [DATAROOTDIR]
49 infodir info documentation [DATAROOTDIR/info]
50 mandir man documentation [DATAROOTDIR/man]
52 This means that if you use any of `@datadir@', `@infodir@', or
53 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
54 defined in this file. As a temporary measure, if any of those are
55 found but no mention of `datarootdir', the substitutions will be
56 replaced with values that do not contain `${datarootdir}', and a
57 warning will be issued.
59 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
60 a trailing slash. Similar change will be made to ac_top_builddir in a
61 future release; the old style value, which matches (../)*, is (and will
62 continue to be) available as ac_top_build_prefix.
65 New macro to check for support of 'typeof' syntax a la GNU C.
67 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
68 New "once-only" variants of commonly-used macros, to make 'configure'
69 smaller and faster in common cases.
72 New macro to check for strtold with C99 semantics.
75 New macro that lets builder disable assertions at 'configure'-time.
78 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
79 X11/Intrinsic.h and XtMalloc (Xt).
81 ** AC_PRESERVE_HELP_ORDER
82 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
83 and AC_ARG_WITH arguments in one region, in the order defined. The default
84 behavior is to group options of each classes separately.
86 ** AC_PROG_CC, AC_PROG_CXX
87 No longer automatically arrange to declare the 'exit' function of C,
88 when a C++ compiler is used. Standard Autoconf macros no longer use
89 'exit', so this is no longer an issue for them. If you use C++, and
90 want to call 'exit', you'll have to arrange for its declaration
91 yourself. But we now suggest you return from 'main' instead.
93 ** AC_PROG_CC_C89, AC_PROG_CC_C99
94 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
95 check for ANSI C89 and ISO C99 support respectively.
98 Has been unobsoleted, and will check if the compiler supports ISO
99 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
100 retained for backwards compatibility, assuming the value of
101 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
104 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
105 New macros for checking commonly-used members of struct dirent.
108 The subtituted value can now contain newlines.
111 The substitution now occurs only when @variable@ is on a line by itself,
112 optionally surrounded by spaces and tabs. The whole line is replaced.
114 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
115 New macros to check for long double, and whether it is wider than double.
116 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
117 applications should switch to the new macro.
119 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
120 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
121 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
122 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
123 New macros to check for C99 and POSIX types.
125 ** AC_USE_SYSTEM_EXTENSIONS
126 New macro to enable extensions to Posix.
129 New macro which is defined to the name of the first declared config header
130 or undefined if no config headers have been declared yet.
133 The macro correctly handles quadrigraphs now.
135 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
136 These macros are new or published now.
139 New macro for copyright notices in testsuite files.
141 ** ALLOCA, LIBOBJS, LTLIBOBJS
142 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
143 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
144 `Makefile.in' in case the object files lie in a different directory.
145 The LIBOBJDIR feature is experimental.
148 Supports --no-recursive now.
150 ** New macros to support Erlang/OTP.
151 New macros for configuring paths to Erlang tools and libraries:
152 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
153 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
154 AC_ERLANG_SUBST_LIB_DIR.
156 New macros for configuring installation of Erlang libraries:
157 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
159 ** The manual now mentions Gnulib more prominently.
161 ** New macros to support Objective C.
162 AC_PROG_OBJC, AC_PROG_OBJCPP.
164 * Major changes in Autoconf 2.59b
166 Released 2004-08-20, by Paul Eggert.
169 New macro that computes the default alignment of a type.
171 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
172 When cross-compiling, these macros will give a warning if the tool
173 is not prefixed. In the future, unprefixed cross tools will not
174 be detected; please consult the info documentation for information
175 about the reason of this change.
177 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
178 New macros that detect programs whose name is prefixed with the
179 target type, if the build type and target type are different.
181 ** AC_REQUIRE_AUX_FILE
182 New trace macro that declares expected auxiliary files.
185 New macro that tests for a grep program that accepts as a long a line
188 ** AC_PROG_EGREP, AC_PROG_FGREP
189 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
190 FGREP="$GREP -F" respectively if possible, or else run a path search for
191 a program that accepts as long a line as possible.
194 New macro that tests for a sed program that truncates as few characters
197 * Major changes in Autoconf 2.59
199 Released 2003-11-04, by Akim Demaille
201 ** ac_abs_builddir etc.
202 Absolute file names were actually relative in 2.58.
204 * Major changes in Autoconf 2.58
206 Released 2003-11-04, by Akim Demaille
209 core.* files are no longer removed, as they may be valid user files.
211 ** autoreconf and auxiliary directory
212 Autoreconf creates the auxiliary directory if needed. This is
213 especially useful for initial "bootstrapping" of fresh CVS checkouts.
215 ** AC_CONFIG_MACRO_DIR
216 Use this macro to declare the directory for local m4 macros for aclocal.
219 No longer includes twice the same file in LIBOBJS if invoked
222 ** AC_CONFIG_COMMANDS
223 The directory for its first argument is automatically created. For
226 AC_CONFIG_COMMANDS([src/modules.hh], [...])
228 $top_builddir/src/ is created if needed.
230 ** Autotest and local.at
231 The optional file local.at is always included in Autotest test suites.
234 The warnings are always issued, including with cached runs.
235 This became a significant problem since aclocal and automake can
236 run autoconf behind the scene.
238 ** autoheader warnings
239 The warnings of autoheader can be turned off, using --warning.
240 For instance, -Wno-obsolete disables the complaints about acconfig.h
241 and other deprecated constructs.
244 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
247 ** AC_DECL_SYS_SIGLIST
251 Now checks that mktime is the inverse of localtime.
253 ** Improve DJGPP portability
254 The Autoconf tools and configure behave better under DJGPP.
256 ** Present But Cannot Be Compiled
257 New FAQ section dedicated to the mystic
259 configure: WARNING: pi.h: present but cannot be compiled
260 configure: WARNING: pi.h: check for missing prerequisite headers?
261 configure: WARNING: pi.h: proceeding with the preprocessor's result
264 ** Concurrent executions of autom4te
265 autom4te now locks its internal files, which enables concurrent
266 executions of autom4te, likely to happen if automake, autoconf,
267 autoheader etc. are run simultaneously.
270 Use of Libtool 1.5 and higher is encouraged. Compatibility with
271 Libtool pre-1.4 is not checked.
274 Testsuites no longer rerun failed tests in verbose mode; instead,
275 failures are logged while the test is run.
277 In addition, expected failures can be marked as such.
279 * Major changes in Autoconf 2.57
281 Released 2002-12-03 by Paul Eggert.
283 Bug fixes for problems with AIX linker, with freestanding C compilers,
284 with GNU m4 limitations, and with obsolete copies of GNU documents.
286 The Free Documentation License has been upgraded from 1.1 to 1.2.
288 * Major changes in Autoconf 2.56
290 Released 2002-11-15 by Akim Demaille.
292 One packaging problem fixed (config/install-sh was not executable).
294 * Major changes in Autoconf 2.55
296 Released 2002-11-14 by Akim Demaille.
300 Have your configure.ac checked by autoscan ("autoscan").
301 Try the warning options ("autoreconf -fv -Wall").
305 - AC_CHECK_HEADER, AC_CHECK_HEADERS
306 More information on proper use.
308 - Writing Test Programs
310 This sections explains how to write good test sources to use with
311 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
313 - AC_FOO_IFELSE vs. AC_TRY_FOO
315 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
316 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
320 - Is more robust to different Gettext installations.
322 - Produces messages (when --verbose) to be understood by Emacs'
325 - Supports -W/--warnings.
328 Once the GNU Build System reinstalled, run `./config.status
329 --recheck && ./config.status && make' if possible.
333 - Supports --cache, and --no-cache.
335 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
336 (autom4te.cache). See `Customizing autom4te' in the documentation.
343 Support for the obsoleted options -m, --macrodir, -l, --localdir is
344 dropped in favor of the safer --include/--prepend-include scheme.
349 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
350 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
351 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
354 Obsoleted macros are kept for Autoconf backward compatibility, but
355 should be avoided in configure.ac. Running autoupdate is advised.
358 - AC_DEFINE/AC_DEFINE_UNQUOTED
360 We have to stop using the old compatibility scheme --that tried to
361 avoid useless backslashes-- because Libtool 1.4.3 contains a
363 AC_DEFINE([error_t], [int],
364 [Define to a type to use for \`error_t' if it is not
365 otherwise available.])
367 We have to quote the single quotes and backslashes with \. The old
368 compatibility scheme saw that ` was backslashed, and therefore did
369 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
370 compatible with Libtool. Autoconf 2.55 is, but in some cases might
371 produce more \ than wanted.
373 Please, note that in the future the same problem will happen with
374 AC_MSG_*: use `autoreconf -f -Wall'.
378 - Portability of the Autoconf package to Solaris.
380 - Spurious warnings caused by config.status.
381 This bug is benign, but painful: on some systems (typically
382 FreeBSD), warnings such as:
384 config.status: creating Makefile
385 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
387 could be issued. This is fixed.
390 Simultaneous executions of config.status are possible again.
392 - Precious variables accumulation
394 config.status could stack several copies of the precious variables
398 ** Plans for later versions
402 The compatibility hooks with the old scheme will be completely
403 removed. Please, advice/use `--build', `--host', and `--target'
406 - AC_CHECK_HEADER, AC_CHECK_HEADERS
408 The tests will be stricter, please make sure your invocations are
413 Shell functions will gradually be introduced, probably starting with
414 Autotest. If you know machines which are in use that you suspect
415 *not* to support shell functions, please run the test suite of
416 Autoconf 2.55 on it, and report the results to
417 bug-autoconf@gnu.org.
421 Special characters in AC_MSG_* need not be quoted. Currently,
422 Autoconf has heuristics to decide when a string is escaped, or has
423 to be escaped. This scheme is fragile, and will be removed; the
424 only risk is uglified messages. Please, run `autoreconf -f -Wall'
425 to find occurrences that will be affected.
427 * Major changes in Autoconf 2.54
429 Released 2002-09-13 by Akim Demaille.
433 - autoreconf no longer changes the version of the gettext/po/intl
434 support files. It now adds the files the correspond to the
435 AM_GNU_GETTEXT_VERSION declared in configure.ac.
437 Warning: It now relies on the 'autopoint' program, which is part
438 of GNU gettext 0.11.4 and newer.
440 Please note that you need to have a GNU gettext version that
441 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
442 in configure.ac. You can upgrade to newer GNU gettext versions,
443 though, without needing to change configure.ac.
445 - The -I DIR or --include=DIR option now appends DIR to the include path
446 instead of prepending; this is for consistency with other GNU tools.
447 The new -B DIR or --prepend-include=DIR option has the old behavior.
452 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
453 Please, remove lines such as
455 # This is necessary so that .o files in LIBOBJS are also
456 # built via the ANSI2KNR-filtering rules.
457 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
459 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
460 your Makefiles either.
462 - AC_CONFIG_LINKS now makes copies if it can't make links.
464 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
465 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
466 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
468 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
470 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
472 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
476 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
477 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
478 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
481 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
484 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
485 for an AC_LIBOBJ replacement.
489 - Spurious complaints from `m4_bmatch' about invalid regular
490 expressions are suppressed.
492 - Empty top_builddirs are properly handled.
494 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
497 Now colon in the optional path arguments are properly handled.
499 ** Improved portability
501 - Both Autoconf the package, and the scripts it produces, should run
502 more reliably with Zsh. Bear in mind it is the default Bourne shell
505 - Autoconf and the scripts it produces no longer assume the existence of
506 the obsolescent commands egrep and fgrep.
510 - Limitations of Make
514 The GNATS base moved to
515 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
516 (It is no longer available, though.)
521 Now contains the list of ouput variables and files (AC_SUBST,
524 * Major changes in Autoconf 2.53
526 Released 2002-03-08 by Akim Demaille.
530 Perl 5.005_03 or later is required: autom4te is written in Perl and is
531 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
537 Argument requirements, output variables, defined macros.
538 - M4sugar, M4sh, Autotest
540 - Double quoting macros
541 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
543 The Autoconf manual is now distributed under the terms of the GNU FDL.
544 - Section `Hosts and Cross-Compilation'
545 Explains the rationale for the 2.5x changes in the cross-compilation
546 chain, and in the relationships between build, host, and target
548 Emphasizes that `cross-compilation' == `--host is given'.
549 If you are working on compilers etc., be sure to read this section.
550 - Section `AC_LIBOBJ vs. LIBOBJS'
551 Explains why assigning LIBOBJS directly is now an error.
552 Details how to update the code.
557 Now used instead of hard coded line numbers.
558 This eases the comparison of `configure's, and diminishes the
559 pressure over control version archives.
560 Automatic replacement for shells that don't support this feature.
561 - New output variables
562 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
567 Autoconf and Autotest modes are provided.
572 New, used by the Autoconf suite to cache and speed up most processing.
574 Supported by autom4te, autoconf and autoheader.
576 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
577 autoupdate, and autoreconf.
579 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
580 automake options are to be given via AUTOMAKE_OPTIONS.
582 Runs gettextize and libtoolize when appropriate.
584 --m4dir is no longer supported.
586 Now runs only in the specified directories, defaulting to `.',
587 but understands AC_CONFIG_SUBDIRS for dependent directories.
588 Before, it used to run on all the `configure.ac' found in the
590 Independent packages are properly updated.
594 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
596 Under the user pressure, $? is finally available. Probably a mistake.
597 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
598 - Precious variables accumulation
599 config.status could stack several copies of the precious variables
601 - AC_PATH_PROG and family.
602 Works properly when given a literal path.
604 Somewhere since 2.13, the result had been reversed.
608 - AC_C_BIGENDIAN supports the cross-compiling case.
609 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
610 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
611 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
613 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
614 precision than `double'.
619 It now defines the preprocessor symbols PACKAGE_NAME,
620 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
624 Admits a fourth optional parameter: the tar name.
626 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
627 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
628 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
631 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
632 Are much less expensive when using long lists of files.
635 Works with shell variables, and non alphanumeric names.
639 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
640 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
642 - AC_FUNC_STRTOD substitutes POW_LIB.
647 * Major changes in Autoconf 2.52
649 Released 2001-07-18 by Akim Demaille.
654 This feature was present in autoconf 2.50 but was not documented.
655 For example, `@<:@' is translated to `[' just before output. This
656 is useful when writing strings that contain unbalanced quotes, or
657 other hard-to-quote constructs.
658 - m4_pattern_forbid, m4_pattern_allow
659 - Tips for upgrading from 2.13.
660 - Using autoscan to maintain a configure.ac.
663 - Now include stdint.h.
664 - sys/types.h and sys/stat.h are guarded.
665 - strings.h is included if available, and not conflicting with string.h.
668 - The test suite is more robust and presents less false failures.
669 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
670 - configure accepts --prefix='' again.
671 - AC_CHECK_LIB works properly when its first argument is not a
673 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
674 - build_, host_, and target_alias are AC_SUBST as in 2.13.
675 - AC_ARG_VAR properly propagates precious variables inherited from the
676 environment to ./config.status.
677 - Using --program-suffix/--program-prefix is portable.
678 - Failures to detect the default compiler's output extension are less
680 - `config.status foo' works properly when `foo' depends on variables
681 set in an AC_CONFIG_THING INIT-CMD.
682 - autoheader is more robust to broken input.
683 - Fixed Fortran name-mangling and link tests on a number of systems,
684 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
687 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
688 specify pre-includes. In this case, the headers are compiled with
689 cc, not merely preprocessed by cpp. Therefore it is the _usability_
690 of a header which is checked for, not just its availability.
691 - AC_ARG_VAR refuses to run configure when precious variables have
693 - Versions of compilers are dumped in the logs.
694 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
697 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
698 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
699 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
700 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
701 Be sure to read `Upgrading from Version 2.13' to understand why
702 running `autoupdate' is needed.
703 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
704 a main-like routine is required/possible when linking C/C++ with
705 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
706 - AC_FUNC_GETPGRG behaves better when cross-compiling.
708 * Major changes in Autoconf 2.51
709 There was no release of Autoconf 2.51 since some packagers had used
710 this version number without permission to ship intermediary versions
711 of 2.50. The version was skipped to avoid confusion.
713 * Major changes in Autoconf 2.50
715 Released 2001-05-21 by Akim Demaille.
718 There have been far too many to enumerate them here. Check out
719 ChangeLog if you really want to know more.
721 ** Improved documentation
722 In particular, portability issues are better covered.
725 All the standard GNU Makefile targets are supported. The layout has
726 changed: m4/ holds the m4 extensions Autoconf needs for its
727 configuration, doc/ contains the documentation, and tests/ contains
730 ** Man pages are provided
731 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
732 config.guess, config.sub.
736 Provides a safe and powerful means to trace the macro uses. This
737 provide the parsing layer for tools which need to `study'
741 Specify what category of warnings should be enabled.
743 - When recursing into subdirectories, try for configure.gnu before
744 configure to adapt for packages not using autoconf on case-insensitive
748 More errors are now caught (circular AC_REQUIRE dependencies,
749 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
750 etc.). In addition, their location and call stack are given.
753 autoupdate is much more powerful, and is able to provide the glue code
754 which might be needed to move from an old macro to its newer
757 You are strongly encouraged to use it to modernize both your
758 `configure.in' and your .m4 extension files.
761 The internal machinery of autoheader has completely changed. As a
762 result, using `acconfig.h' should be considered to be obsoleted, and
763 you are encouraged to get rid of it using the AH macros.
768 ** Fortran 77 compilers
769 Globally, the support for Fortran 77 is considerably improved.
771 Support for automatically determining a Fortran 77 compiler's
772 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
773 provided to wrap C/C++ identifiers, thus making it easier and more
774 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
775 call C/C++ routines. See the Texinfo documentation for details.
778 The test suite no longer uses DejaGNU. It should be easy to submit
779 test cases in this new framework.
782 - --help, --help=long, -hl
783 no longer dumps useless items.
785 lists only specific options.
786 - --help=recursive, -hr
787 displays the help of all the embedded packages.
788 - Remembers environment variables when reconfiguring.
789 The previous scheme to set envvar before running configure was
791 what prevented configure from remembering the environment in which
792 it was run, therefore --recheck was run in an inconsistent
793 environment. Now, one should run
795 and then --recheck will work properly. Variables declared with
796 AC_ARG_VAR are also preserved.
798 $build defaults to `config.guess`, $host to $build, and then $target
800 Cross-compilation is a global status of the package, it no longer
801 depends upon the current language.
802 Cross compilation is enabled iff the user specified `--host'.
803 `configure' now fails if it can't run the executables it compiles,
804 unless cross-compilation is enabled.
806 The cache file is disabled by default. The new options
807 `--config-cache', `-C' set the cache to `config.cache'.
811 Much faster on most architectures.
812 - concurrent executions
813 It is safe to use `make -j' with config.status.
814 - human interface improved
815 It is possible to invoke
816 ./config.status foobar
817 instead of the former form (still valid)
818 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
819 CONFIG_FILES=foobar:foo.in:bar.in \
821 The same holds for configuration headers and links.
822 You can instantiate unknown files and headers:
823 ./config.status --header foo.h:foo.h.in --file bar:baz
824 - has a useful --help
825 - accepts special file name "-" for stdin/stdout
830 Specify additional copyright information.
833 Now expects the identity of the package as argument.
837 Most macros, if not all, now strictly follow the `one quotation
838 level' rule. This results in a more predictable expansion.
841 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
842 configure scripts, was fixed by Axel Thimm.
846 Document and ask for the registration of an envvar.
849 Specifies the file which `configure' should look for when trying to
850 find the source tree (used to be handled by AC_INIT).
853 To add new actions to config.status. Should be used instead of
857 Replaces AC_LINK_FILES.
859 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
860 AC_CONFIG_LINKS, and AC_CONFIG_FILES
861 They now obey sh: you should no longer use shell variables as
864 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
865 AC_CONFIG_SUBDIRS($my_subdirs)
869 if test "$package_foo_enabled" = yes; then
870 AC_CONFIG_SUBDIRS(foo)
874 To format an Autoconf macro's help string so that it looks pretty
875 when the user executes `configure --help'.
878 ** Generic Test Macros
880 The interface of the AC_CHECK families of macros (decl, header,
881 type, member, func) is now uniform. They support the same set of
884 - AC_CHECK_DECL, AC_CHECK_DECLS
885 To check whether a symbol is declared.
887 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
888 No longer need a cross-compilation default.
891 The test it performs is much more robust than previously, and makes
892 it possible to test builtin types in addition to typedefs.
893 It is now schizophrenic:
894 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
895 remains for backward compatibility, but its use is discouraged.
896 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
897 behaves exactly like the other AC_CHECK macros.
900 Checks whether given types are supported by the system.
902 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
903 Check for given members in aggregates (e.g., pw_gecos in struct
907 Checks if the compiler supports ISO C, included when needs special
911 Checking whether the preprocessor indicates missing includes by the
912 error code. stderr is checked by AC_TRY_CPP only as a fallback.
915 Takes a language as argument and replaces AC_LANG_C,
916 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
918 - AC_LANG_PUSH, AC_LANG_POP
919 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
922 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
923 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
924 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
931 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
934 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
937 Arrange for large-file support.
939 - AC_EXEEXT, AC_OBJEXT
940 You are no longer expected to use them: their computation is
941 performed by default.
944 Every macro has been revisited in order to support at best CC=c++.
946 Major changes in Autoconf 2.14:
947 There was no release of GNU Autoconf 2.14.
949 Major changes in Autoconf 2.13:
951 Released 1999-05-01 by Ben Elliston.
953 * Support for building on Win32 systems where the only available C or
954 C++ compiler is the Microsoft Visual C++ command line compiler
955 (`cl'). Additional support for building on Win32 systems which are
956 using the Cygwin or Mingw32 environments.
957 * Support for alternative object file and executable file extensions.
958 On Win32, for example, these are .obj and .exe. These are discovered
959 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
960 @EXEEXT@ in the output, respectively.
961 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
962 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
963 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
964 * AC_DEFINE now has an optional third argument for a description to be
965 placed in the config header input file (e.g. config.h.in).
966 * The C++ code fragment compiled for the C++ compiler test had to be
967 improved to include an explicit return type for main(). This was
968 causing failures on systems using recent versions of the EGCS C++
970 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
971 script to report that `sometype_t' was present when only `type_t'
973 * Merge of the FSF version of config.guess and config.sub to modernize
974 these scripts. Add support for a few new hosts in config.guess.
975 Incorporate latest versions of install-sh, mkinstalldirs and
976 texinfo.tex from the FSF.
977 * autoreconf is capable of running automake if necessary (and
979 * Support for Fortran 77. See the Texinfo documentation for details.
980 * Bug fixes and workarounds for quirky bugs in vendor utilities.
982 Major changes in Autoconf 2.12:
984 Released 1996-11-26 by David J. MacKenzie
986 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
987 concatenating multiple input files separated by colons, like so:
988 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
989 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
990 The arguments may be shell variables, to compute the lists on the fly.
991 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
992 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
995 Major changes in Autoconf 2.11:
997 Released November 18th, 1996, by David J. MacKenzie
999 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1000 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1001 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1002 * AC_CONFIG_HEADER expands shell variables in its argument.
1003 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1004 * The "checking..." messages and the source code for test programs that
1005 fail are saved in config.log.
1006 * Another workaround has been added for seds with small command length limits.
1007 * config.sub and config.guess recognize more system types.
1010 Major changes in Autoconf 2.10:
1012 Released May 7th, 1996, by Roland McGrath
1015 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1016 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1018 Major changes in Autoconf 2.9:
1020 Released March 16th, 1996, by Roland McGrath
1024 Major changes in Autoconf 2.8:
1026 Released March 8th, 1996, by Roland McGrath
1030 Major changes in Autoconf 2.7:
1032 Released November 22nd, 1995, by David J. MacKenzie
1036 Major changes in Autoconf 2.6:
1038 Released November 20th, 1995, by David J. MacKenzie
1042 Major changes in Autoconf 2.5:
1044 Released November 17th, 1995, by Roland McGrath
1046 * New configure options --bindir, --libdir, --datadir, etc., with
1047 corresponding output variables.
1048 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1049 * config.log contains the command being run as well as any output from it.
1050 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1051 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1052 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1053 AC_CHECK_TOOL can search a path other than $PATH.
1054 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1056 Major changes in Autoconf 2.4:
1058 Released June 14th, 1995, by David J. MacKenzie
1060 * Fix a few bugs found by Emacs testers.
1062 Major changes in Autoconf 2.3:
1064 Released March 27th, 1995, by David J. MacKenzie
1066 * Fix the cleanup trap in several ways.
1067 * Handle C compilers that are picky about option placement.
1068 * ifnames gets the version number from the right directory.
1070 Major changes in Autoconf 2.2:
1072 Released March 8th, 1995, by David J. MacKenzie
1074 * The ifnames utility is much faster but requires a "new awk" interpreter.
1075 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1076 library before existing libs, not after, in case it uses them.
1077 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1078 * Lots of bug fixes.
1079 * Many additions to the TODO file :-)
1081 Major changes in Autoconf 2.1:
1083 Released November 4th, 1994, by David J. MacKenzie
1086 * More explanations in the manual.
1087 * Fix a spurious failure in the testsuite.
1088 * Clarify some warning messages.
1089 * autoreconf by default only rebuilds configure and config.h.in files
1090 that are older than any of their particular input files; there is a
1091 --force option to use after installing a new version of Autoconf.
1093 Thanks to everybody who's submitted changes and additions to Autoconf!
1094 I've incorporated many of them, and am still considering others for
1095 future releases -- but I didn't want to postpone this release indefinitely.
1097 Caution: don't indiscriminately rebuild configure scripts with
1098 Autoconf version 2. Some configure.in files need minor adjustments to
1099 work with it; the documentation has a chapter on upgrading. A few
1100 configure.in files, including those for GNU Emacs and the GNU C
1101 Library, need major changes because they relied on undocumented
1102 internals of version 1. Future releases of those packages will have
1103 updated configure.in files.
1105 It's best to use GNU m4 1.3 (or later) with Autoconf version 2.
1106 Autoconf now makes heavy use of m4 diversions, which were implemented
1107 inefficiently in GNU m4 releases before 1.3.
1109 Major changes in Autoconf 2.0:
1111 Released October 26th, 1994, by David J. MacKenzie
1113 ** New copyright terms:
1114 * There are no restrictions on distribution or use of configure scripts.
1117 * Autoconf manual is reorganized to make information easier to find
1118 and has several new indexes.
1119 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1122 * autoscan to generate a preliminary configure.in for a package by
1123 scanning its source code for commonly used nonportable functions,
1124 programs, and header files.
1125 * ifnames to list the symbols used in #if and #ifdef directives in a
1127 * autoupdate to update a configure.in to use the version 2 macro names.
1128 * autoreconf to recursively remake configure and configuration header
1129 files in a source tree.
1131 ** Changed utilities:
1132 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1133 * autoconf and autoheader can look for package-local definition files
1134 in an alternate directory.
1137 * AC_CACHE_VAL to share results of tests between configure runs.
1138 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1139 that macros invoked with AC_REQUIRE don't interrupt other macros.
1140 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1141 support deciding unguessable features based on the host and target types.
1142 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1143 * AC_ARG_PROGRAM to use the options --program-prefix,
1144 --program-suffix, and --program-transform-name to change the names
1145 of programs being installed.
1146 * AC_PREFIX_DEFAULT to change the default installation prefix.
1147 * AC_TRY_COMPILE to compile a test program without linking it.
1148 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1149 * AC_CHECK_LIB to check for a particular function and library.
1150 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1151 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1152 * AC_SUBST_FILE to insert one file into another.
1153 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1154 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1155 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1156 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1159 * Many macros renamed systematically, but old names are accepted for
1160 backward compatibility.
1161 * AC_OUTPUT adds the "automatically generated" comment to
1162 non-Makefiles where it finds @configure_input@ in an input file, to
1163 support files with various comment syntaxes.
1164 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1165 files when they are not enclosed in @ signs.
1166 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1167 override the file name "config.status".
1168 * AC_OUTPUT takes an optional argument for passing variables from
1169 configure to config.status.
1170 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1171 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1172 CPPFLAGS, and LDFLAGS from the environment.
1173 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1174 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1175 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1176 srcdir/../.. by default.
1177 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1178 * AC_DEFINE no longer prints anything, because of the new result reporting
1179 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1180 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1181 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1182 --enable- and --with- options.
1183 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1184 execute on success or failure.
1185 * Checking for C functions in C++ works.
1188 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1189 better maintained with them.
1190 * AC_ARG_ARRAY removed because no one was likely using it.
1191 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1192 take arguments, for consistency with all of the other specific checks.
1195 * Comes with config.sub and config.guess, and uses them optionally.
1196 * Uses config.cache to cache test results. An alternate cache file
1197 can be selected with the --cache-file=FILE option.
1198 * Uses optional shell scripts $prefix/share/config.site and
1199 $prefix/etc/config.site to perform site or system specific initializations.
1200 * configure saves compiler output to ./config.log for debugging.
1201 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1202 * acsite.m4 is the new name for the system-wide aclocal.m4.
1203 * Has a DejaGnu test suite.
1205 Major changes in Autoconf 1.11:
1207 * AC_PROG_INSTALL calls install.sh with the -c option.
1208 * AC_SET_MAKE cleans up after itself.
1209 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1210 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1212 Plus a few other bug fixes.
1214 Major changes in Autoconf 1.10:
1216 * autoheader uses config.h.bot if present, analogous to config.h.top.
1217 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1219 * AC_PROG_CXX looks for cxx as a C++ compiler.
1221 Plus several bugs fixed.
1223 Major changes in Autoconf 1.9:
1225 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1226 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1227 and autoheader generates entries for those names automatically.
1228 * AC_FIND_X gets the result from xmkmf correctly.
1229 * AC_FIND_X assumes no X if --without-x was given.
1230 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1231 * AC_PROG_INSTALL finds OSF/1 installbsd.
1233 Major changes in Autoconf 1.8:
1236 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1237 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1238 for checking both C++ and C features in one configure script.
1239 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1240 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1241 AC_SET_MAKE, AC_ENABLE.
1244 * AC_FIND_X looks for X in more places.
1245 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1246 install.sh is distributed with Autoconf.
1247 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1248 a rewrite of quoting in AC_DEFINE.
1249 * AC_OUTPUT adds its comments in C format when substituting in C files.
1250 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1252 ** New or changed command line options:
1253 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1254 * configure accepts --without-PACKAGE, which sets withval=no.
1255 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1256 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1257 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1258 * configure accepts and ignores most other Cygnus configure options, and
1259 warns about unknown options.
1260 * config.status accepts --help, --version options.
1262 ** File names and other changes:
1263 * Relative srcdir values are not made absolute.
1264 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1265 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1266 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1267 * The example Makefile dependencies for configure et al. work better.
1268 * Namespace cleanup: all shell variables used internally by Autoconf
1269 have names beginning with `ac_'.
1271 More big improvements are in process for future releases, but have not
1272 yet been (variously) finished, integrated, tested, or documented enough
1275 Major changes in Autoconf 1.7:
1277 * New macro AC_OBSOLETE.
1278 * Bugs in Makefile.in fixed.
1279 * AC_LONG_FILE_NAMES improved.
1281 Major changes in Autoconf 1.6:
1283 * New macro AC_LONG_64_BITS.
1284 * Multiple .h files can be created.
1285 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1286 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1287 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1288 * Unused --no-create option to configure removed.
1289 * autoheader doesn't change the timestamp of its output file if
1290 the file didn't change.
1291 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1292 * config.status checks three optional environment variables to
1293 modify its behavior.
1294 * The usual bug fixes.
1296 Major changes in Autoconf 1.5:
1298 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1299 * autoconf and autoheader scripts have GNU standards conforming
1300 --version and --help options (they print their message and exit).
1303 Major changes in Autoconf 1.4:
1305 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1306 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1307 * autoconf and autoheader use the M4 environment variable to determine the
1308 name of the m4 program to use.
1309 * The --macrodir option to autoconf and autoheader specifies the directory
1310 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1311 * autoconf and autoheader can take `-' as their file names, which means to
1312 read stdin as input.
1313 * Resulting configure scripts can take a --verbose option which causes them
1314 to print the results of their tests.
1315 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1316 shell characters, etc. will be preserved during various stages of
1317 expansion done by the shell. If you don't want this, use
1318 AC_DEFINE_UNQUOTED instead.
1319 * Much textual processing done with external calls to tr and sed have been
1320 internalized with builtin m4 `patsubst' and `translit' calls.
1321 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1322 set the shell variables `gen_files' and `gen_config' to the list of
1323 file names to output.
1324 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1325 "lex.yy" or "lexyy", depending on the system.
1326 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1328 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1329 * AC_CONST works much more reliably on more systems.
1332 Major changes in Autoconf 1.3:
1334 configure no longer requires awk for packages that use a config.h.
1335 Support handling --with-PACKAGE options.
1336 New `autoheader' script to create `config.h.in' from `configure.in'.
1337 Ignore troublesome -lucb and -lPW when searching for alloca.
1338 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1339 Improve detection of STDC library.
1340 Add AC_HAVE_LIBRARY to check for non-default libraries.
1341 Function checking should work with future GNU libc releases.
1343 Major changes in Autoconf 1.2:
1345 The --srcdir option is now usually unnecessary.
1346 Add a file containing sample comments describing CPP macros.
1347 A comment in config.status tells which host it was configured on.
1348 Substituted variable values can now contain commas.
1349 Fix bugs in various feature checks.
1351 Major changes in Autoconf 1.1:
1353 Added AC_STRCOLL macro.
1354 Made AC_GETLOADAVG check for more things.
1355 AC_OUTPUT argument is now optional.
1360 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1361 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1363 This file is part of GNU Autoconf.
1365 GNU Autoconf is free software; you can redistribute it and/or modify
1366 it under the terms of the GNU General Public License as published by
1367 the Free Software Foundation; either version 2, or (at your option)
1370 GNU Autoconf is distributed in the hope that it will be useful,
1371 but WITHOUT ANY WARRANTY; without even the implied warranty of
1372 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1373 GNU General Public License for more details.
1375 You should have received a copy of the GNU General Public License
1376 along with GNU Autoconf; see the file COPYING. If not, write to
1377 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
1378 Boston, MA 02110-1301, USA.