1 * Major changes in Autoconf 2.59d
3 * Major changes in Autoconf 2.59c
5 Released 2006-04-12, by Ralf Wildenhues.
7 ** The configure command now redirects standard input from /dev/null,
8 to help avoid problems with subsidiary commands that might mistakenly
9 read standard input. AS_ORIGINAL_STDIN_FD points to the original
10 standard input before this redirection, if you really want configure to
11 read from standard input.
13 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
14 The following directory variables are new:
16 datarootdir read-only architecture-independent data root [PREFIX/share]
17 localedir locale-specific message catalogs [DATAROOTDIR/locale]
18 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
19 htmldir html documentation [DOCDIR]
20 dvidir dvi documentation [DOCDIR]
21 pdfdir pdf documentation [DOCDIR]
22 psdir ps documentation [DOCDIR]
24 The following variables have new default values:
26 datadir read-only architecture-independent data [DATAROOTDIR]
27 infodir info documentation [DATAROOTDIR/info]
28 mandir man documentation [DATAROOTDIR/man]
30 This means that if you use any of `@datadir@', `@infodir@', or
31 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
32 defined in this file. As a temporary measure, if any of those are
33 found but no mention of `datarootdir', the substitutions will be
34 replaced with values that do not contain `${datarootdir}', and a
35 warning will be issued.
37 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
38 a trailing slash. Similar change will be made to ac_top_builddir in a
39 future release; the old style value, which matches (../)*, is (and will
40 continue to be) available as ac_top_build_prefix.
43 New macro to check for support of 'typeof' syntax a la GNU C.
45 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
46 New "once-only" variants of commonly-used macros, to make 'configure'
47 smaller and faster in common cases.
50 New macro to check for strtold with C99 semantics.
53 New macro that lets builder disable assertions at 'configure'-time.
56 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
57 X11/Intrinsic.h and XtMalloc (Xt).
59 ** AC_PRESERVE_HELP_ORDER
60 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
61 and AC_ARG_WITH arguments in one region, in the order defined. The default
62 behavior is to group options of each classes separately.
64 ** AC_PROG_CC, AC_PROG_CXX
65 No longer automatically arrange to declare the 'exit' function of C,
66 when a C++ compiler is used. Standard Autoconf macros no longer use
67 'exit', so this is no longer an issue for them. If you use C++, and
68 want to call 'exit', you'll have to arrange for its declaration
69 yourself. But we now suggest you return from 'main' instead.
71 ** AC_PROG_CC_C89, AC_PROG_CC_C99
72 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
73 check for ANSI C89 and ISO C99 support respectively.
76 Has been unobsoleted, and will check if the compiler supports ISO
77 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
78 retained for backwards compatibility, assuming the value of
79 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
82 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
83 New macros for checking commonly-used members of struct dirent.
86 The subtituted value can now contain newlines.
89 The substitution now occurs only when @variable@ is on a line by itself,
90 optionally surrounded by spaces and tabs. The whole line is replaced.
92 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
93 New macros to check for long double, and whether it is wider than double.
94 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
95 applications should switch to the new macro.
97 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
98 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
99 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
100 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
101 New macros to check for C99 and POSIX types.
103 ** AC_USE_SYSTEM_EXTENSIONS
104 New macro to enable extensions to Posix.
107 New macro which is defined to the name of the first declared config header
108 or undefined if no config headers have been declared yet.
111 The macro correctly handles quadrigraphs now.
113 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
114 These macros are new or published now.
117 New macro for copyright notices in testsuite files.
119 ** ALLOCA, LIBOBJS, LTLIBOBJS
120 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
121 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
122 `Makefile.in' in case the object files lie in a different directory.
123 The LIBOBJDIR feature is experimental.
126 Supports --no-recursive now.
128 ** New macros to support Erlang/OTP.
129 New macros for configuring paths to Erlang tools and libraries:
130 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
131 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
132 AC_ERLANG_SUBST_LIB_DIR.
134 New macros for configuring installation of Erlang libraries:
135 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
137 ** The manual now mentions Gnulib more prominently.
139 ** New macros to support Objective C.
140 AC_PROG_OBJC, AC_PROG_OBJCPP.
142 * Major changes in Autoconf 2.59b
144 Released 2004-08-20, by Paul Eggert.
147 New macro that computes the default alignment of a type.
149 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
150 When cross-compiling, these macros will give a warning if the tool
151 is not prefixed. In the future, unprefixed cross tools will not
152 be detected; please consult the info documentation for information
153 about the reason of this change.
155 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
156 New macros that detect programs whose name is prefixed with the
157 target type, if the build type and target type are different.
159 ** AC_REQUIRE_AUX_FILE
160 New trace macro that declares expected auxiliary files.
163 New macro that tests for a grep program that accepts as a long a line
166 ** AC_PROG_EGREP, AC_PROG_FGREP
167 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
168 FGREP="$GREP -F" respectively if possible, or else run a path search for
169 a program that accepts as long a line as possible.
172 New macro that tests for a sed program that truncates as few characters
175 * Major changes in Autoconf 2.59
177 Released 2003-11-04, by Akim Demaille
179 ** ac_abs_builddir etc.
180 Absolute file names were actually relative in 2.58.
182 * Major changes in Autoconf 2.58
184 Released 2003-11-04, by Akim Demaille
187 core.* files are no longer removed, as they may be valid user files.
189 ** autoreconf and auxiliary directory
190 Autoreconf creates the auxiliary directory if needed. This is
191 especially useful for initial "bootstrapping" of fresh CVS checkouts.
193 ** AC_CONFIG_MACRO_DIR
194 Use this macro to declare the directory for local m4 macros for aclocal.
197 No longer includes twice the same file in LIBOBJS if invoked
200 ** AC_CONFIG_COMMANDS
201 The directory for its first argument is automatically created. For
204 AC_CONFIG_COMMANDS([src/modules.hh], [...])
206 $top_builddir/src/ is created if needed.
208 ** Autotest and local.at
209 The optional file local.at is always included in Autotest test suites.
212 The warnings are always issued, including with cached runs.
213 This became a significant problem since aclocal and automake can
214 run autoconf behind the scene.
216 ** autoheader warnings
217 The warnings of autoheader can be turned off, using --warning.
218 For instance, -Wno-obsolete disables the complaints about acconfig.h
219 and other deprecated constructs.
222 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
225 ** AC_DECL_SYS_SIGLIST
229 Now checks that mktime is the inverse of localtime.
231 ** Improve DJGPP portability
232 The Autoconf tools and configure behave better under DJGPP.
234 ** Present But Cannot Be Compiled
235 New FAQ section dedicated to the mystic
237 configure: WARNING: pi.h: present but cannot be compiled
238 configure: WARNING: pi.h: check for missing prerequisite headers?
239 configure: WARNING: pi.h: proceeding with the preprocessor's result
242 ** Concurrent executions of autom4te
243 autom4te now locks its internal files, which enables concurrent
244 executions of autom4te, likely to happen if automake, autoconf,
245 autoheader etc. are run simultaneously.
248 Use of Libtool 1.5 and higher is encouraged. Compatibility with
249 Libtool pre-1.4 is not checked.
252 Testsuites no longer rerun failed tests in verbose mode; instead,
253 failures are logged while the test is run.
255 In addition, expected failures can be marked as such.
257 * Major changes in Autoconf 2.57
259 Released 2002-12-03 by Paul Eggert.
261 Bug fixes for problems with AIX linker, with freestanding C compilers,
262 with GNU m4 limitations, and with obsolete copies of GNU documents.
264 The Free Documentation License has been upgraded from 1.1 to 1.2.
266 * Major changes in Autoconf 2.56
268 Released 2002-11-15 by Akim Demaille.
270 One packaging problem fixed (config/install-sh was not executable).
272 * Major changes in Autoconf 2.55
274 Released 2002-11-14 by Akim Demaille.
278 Have your configure.ac checked by autoscan ("autoscan").
279 Try the warning options ("autoreconf -fv -Wall").
283 - AC_CHECK_HEADER, AC_CHECK_HEADERS
284 More information on proper use.
286 - Writing Test Programs
288 This sections explains how to write good test sources to use with
289 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
291 - AC_FOO_IFELSE vs. AC_TRY_FOO
293 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
294 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
298 - Is more robust to different Gettext installations.
300 - Produces messages (when --verbose) to be understood by Emacs'
303 - Supports -W/--warnings.
306 Once the GNU Build System reinstalled, run `./config.status
307 --recheck && ./config.status && make' if possible.
311 - Supports --cache, and --no-cache.
313 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
314 (autom4te.cache). See `Customizing autom4te' in the documentation.
321 Support for the obsoleted options -m, --macrodir, -l, --localdir is
322 dropped in favor of the safer --include/--prepend-include scheme.
327 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
328 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
329 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
332 Obsoleted macros are kept for Autoconf backward compatibility, but
333 should be avoided in configure.ac. Running autoupdate is advised.
336 - AC_DEFINE/AC_DEFINE_UNQUOTED
338 We have to stop using the old compatibility scheme --that tried to
339 avoid useless backslashes-- because Libtool 1.4.3 contains a
341 AC_DEFINE([error_t], [int],
342 [Define to a type to use for \`error_t' if it is not
343 otherwise available.])
345 We have to quote the single quotes and backslashes with \. The old
346 compatibility scheme saw that ` was backslashed, and therefore did
347 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
348 compatible with Libtool. Autoconf 2.55 is, but in some cases might
349 produce more \ than wanted.
351 Please, note that in the future the same problem will happen with
352 AC_MSG_*: use `autoreconf -f -Wall'.
356 - Portability of the Autoconf package to Solaris.
358 - Spurious warnings caused by config.status.
359 This bug is benign, but painful: on some systems (typically
360 FreeBSD), warnings such as:
362 config.status: creating Makefile
363 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
365 could be issued. This is fixed.
368 Simultaneous executions of config.status are possible again.
370 - Precious variables accumulation
372 config.status could stack several copies of the precious variables
376 ** Plans for later versions
380 The compatibility hooks with the old scheme will be completely
381 removed. Please, advice/use `--build', `--host', and `--target'
384 - AC_CHECK_HEADER, AC_CHECK_HEADERS
386 The tests will be stricter, please make sure your invocations are
391 Shell functions will gradually be introduced, probably starting with
392 Autotest. If you know machines which are in use that you suspect
393 *not* to support shell functions, please run the test suite of
394 Autoconf 2.55 on it, and report the results to
395 bug-autoconf@gnu.org.
399 Special characters in AC_MSG_* need not be quoted. Currently,
400 Autoconf has heuristics to decide when a string is escaped, or has
401 to be escaped. This scheme is fragile, and will be removed; the
402 only risk is uglified messages. Please, run `autoreconf -f -Wall'
403 to find occurrences that will be affected.
405 * Major changes in Autoconf 2.54
407 Released 2002-09-13 by Akim Demaille.
411 - autoreconf no longer changes the version of the gettext/po/intl
412 support files. It now adds the files the correspond to the
413 AM_GNU_GETTEXT_VERSION declared in configure.ac.
415 Warning: It now relies on the 'autopoint' program, which is part
416 of GNU gettext 0.11.4 and newer.
418 Please note that you need to have a GNU gettext version that
419 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
420 in configure.ac. You can upgrade to newer GNU gettext versions,
421 though, without needing to change configure.ac.
423 - The -I DIR or --include=DIR option now appends DIR to the include path
424 instead of prepending; this is for consistency with other GNU tools.
425 The new -B DIR or --prepend-include=DIR option has the old behavior.
430 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
431 Please, remove lines such as
433 # This is necessary so that .o files in LIBOBJS are also
434 # built via the ANSI2KNR-filtering rules.
435 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
437 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
438 your Makefiles either.
440 - AC_CONFIG_LINKS now makes copies if it can't make links.
442 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
443 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
444 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
446 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
448 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
450 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
454 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
455 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
456 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
459 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
462 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
463 for an AC_LIBOBJ replacement.
467 - Spurious complaints from `m4_bmatch' about invalid regular
468 expressions are suppressed.
470 - Empty top_builddirs are properly handled.
472 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
475 Now colon in the optional path arguments are properly handled.
477 ** Improved portability
479 - Both Autoconf the package, and the scripts it produces, should run
480 more reliably with Zsh. Bear in mind it is the default Bourne shell
483 - Autoconf and the scripts it produces no longer assume the existence of
484 the obsolescent commands egrep and fgrep.
488 - Limitations of Make
492 The GNATS base moved to
493 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
494 (It is no longer available, though.)
499 Now contains the list of ouput variables and files (AC_SUBST,
502 * Major changes in Autoconf 2.53
504 Released 2002-03-08 by Akim Demaille.
508 Perl 5.005_03 or later is required: autom4te is written in Perl and is
509 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
515 Argument requirements, output variables, defined macros.
516 - M4sugar, M4sh, Autotest
518 - Double quoting macros
519 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
521 The Autoconf manual is now distributed under the terms of the GNU FDL.
522 - Section `Hosts and Cross-Compilation'
523 Explains the rationale for the 2.5x changes in the cross-compilation
524 chain, and in the relationships between build, host, and target
526 Emphasizes that `cross-compilation' == `--host is given'.
527 If you are working on compilers etc., be sure to read this section.
528 - Section `AC_LIBOBJ vs. LIBOBJS'
529 Explains why assigning LIBOBJS directly is now an error.
530 Details how to update the code.
535 Now used instead of hard coded line numbers.
536 This eases the comparison of `configure's, and diminishes the
537 pressure over control version archives.
538 Automatic replacement for shells that don't support this feature.
539 - New output variables
540 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
545 Autoconf and Autotest modes are provided.
550 New, used by the Autoconf suite to cache and speed up most processing.
552 Supported by autom4te, autoconf and autoheader.
554 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
555 autoupdate, and autoreconf.
557 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
558 automake options are to be given via AUTOMAKE_OPTIONS.
560 Runs gettextize and libtoolize when appropriate.
562 --m4dir is no longer supported.
564 Now runs only in the specified directories, defaulting to `.',
565 but understands AC_CONFIG_SUBDIRS for dependent directories.
566 Before, it used to run on all the `configure.ac' found in the
568 Independent packages are properly updated.
572 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
574 Under the user pressure, $? is finally available. Probably a mistake.
575 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
576 - Precious variables accumulation
577 config.status could stack several copies of the precious variables
579 - AC_PATH_PROG and family.
580 Works properly when given a literal path.
582 Somewhere since 2.13, the result had been reversed.
586 - AC_C_BIGENDIAN supports the cross-compiling case.
587 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
588 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
589 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
591 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
592 precision than `double'.
597 It now defines the preprocessor symbols PACKAGE_NAME,
598 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
602 Admits a fourth optional parameter: the tar name.
604 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
605 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
606 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
609 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
610 Are much less expensive when using long lists of files.
613 Works with shell variables, and non alphanumeric names.
617 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
618 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
620 - AC_FUNC_STRTOD substitutes POW_LIB.
625 * Major changes in Autoconf 2.52
627 Released 2001-07-18 by Akim Demaille.
632 This feature was present in autoconf 2.50 but was not documented.
633 For example, `@<:@' is translated to `[' just before output. This
634 is useful when writing strings that contain unbalanced quotes, or
635 other hard-to-quote constructs.
636 - m4_pattern_forbid, m4_pattern_allow
637 - Tips for upgrading from 2.13.
638 - Using autoscan to maintain a configure.ac.
641 - Now include stdint.h.
642 - sys/types.h and sys/stat.h are guarded.
643 - strings.h is included if available, and not conflicting with string.h.
646 - The test suite is more robust and presents less false failures.
647 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
648 - configure accepts --prefix='' again.
649 - AC_CHECK_LIB works properly when its first argument is not a
651 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
652 - build_, host_, and target_alias are AC_SUBST as in 2.13.
653 - AC_ARG_VAR properly propagates precious variables inherited from the
654 environment to ./config.status.
655 - Using --program-suffix/--program-prefix is portable.
656 - Failures to detect the default compiler's output extension are less
658 - `config.status foo' works properly when `foo' depends on variables
659 set in an AC_CONFIG_THING INIT-CMD.
660 - autoheader is more robust to broken input.
661 - Fixed Fortran name-mangling and link tests on a number of systems,
662 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
665 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
666 specify pre-includes. In this case, the headers are compiled with
667 cc, not merely preprocessed by cpp. Therefore it is the _usability_
668 of a header which is checked for, not just its availability.
669 - AC_ARG_VAR refuses to run configure when precious variables have
671 - Versions of compilers are dumped in the logs.
672 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
675 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
676 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
677 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
678 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
679 Be sure to read `Upgrading from Version 2.13' to understand why
680 running `autoupdate' is needed.
681 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
682 a main-like routine is required/possible when linking C/C++ with
683 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
684 - AC_FUNC_GETPGRG behaves better when cross-compiling.
686 * Major changes in Autoconf 2.51
687 There was no release of Autoconf 2.51 since some packagers had used
688 this version number without permission to ship intermediary versions
689 of 2.50. The version was skipped to avoid confusion.
691 * Major changes in Autoconf 2.50
693 Released 2001-05-21 by Akim Demaille.
696 There have been far too many to enumerate them here. Check out
697 ChangeLog if you really want to know more.
699 ** Improved documentation
700 In particular, portability issues are better covered.
703 All the standard GNU Makefile targets are supported. The layout has
704 changed: m4/ holds the m4 extensions Autoconf needs for its
705 configuration, doc/ contains the documentation, and tests/ contains
708 ** Man pages are provided
709 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
710 config.guess, config.sub.
714 Provides a safe and powerful means to trace the macro uses. This
715 provide the parsing layer for tools which need to `study'
719 Specify what category of warnings should be enabled.
721 - When recursing into subdirectories, try for configure.gnu before
722 configure to adapt for packages not using autoconf on case-insensitive
726 More errors are now caught (circular AC_REQUIRE dependencies,
727 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
728 etc.). In addition, their location and call stack are given.
731 autoupdate is much more powerful, and is able to provide the glue code
732 which might be needed to move from an old macro to its newer
735 You are strongly encouraged to use it to modernize both your
736 `configure.in' and your .m4 extension files.
739 The internal machinery of autoheader has completely changed. As a
740 result, using `acconfig.h' should be considered to be obsoleted, and
741 you are encouraged to get rid of it using the AH macros.
746 ** Fortran 77 compilers
747 Globally, the support for Fortran 77 is considerably improved.
749 Support for automatically determining a Fortran 77 compiler's
750 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
751 provided to wrap C/C++ identifiers, thus making it easier and more
752 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
753 call C/C++ routines. See the Texinfo documentation for details.
756 The test suite no longer uses DejaGNU. It should be easy to submit
757 test cases in this new framework.
760 - --help, --help=long, -hl
761 no longer dumps useless items.
763 lists only specific options.
764 - --help=recursive, -hr
765 displays the help of all the embedded packages.
766 - Remembers environment variables when reconfiguring.
767 The previous scheme to set envvar before running configure was
769 what prevented configure from remembering the environment in which
770 it was run, therefore --recheck was run in an inconsistent
771 environment. Now, one should run
773 and then --recheck will work properly. Variables declared with
774 AC_ARG_VAR are also preserved.
776 $build defaults to `config.guess`, $host to $build, and then $target
778 Cross-compilation is a global status of the package, it no longer
779 depends upon the current language.
780 Cross compilation is enabled iff the user specified `--host'.
781 `configure' now fails if it can't run the executables it compiles,
782 unless cross-compilation is enabled.
784 The cache file is disabled by default. The new options
785 `--config-cache', `-C' set the cache to `config.cache'.
789 Much faster on most architectures.
790 - concurrent executions
791 It is safe to use `make -j' with config.status.
792 - human interface improved
793 It is possible to invoke
794 ./config.status foobar
795 instead of the former form (still valid)
796 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
797 CONFIG_FILES=foobar:foo.in:bar.in \
799 The same holds for configuration headers and links.
800 You can instantiate unknown files and headers:
801 ./config.status --header foo.h:foo.h.in --file bar:baz
802 - has a useful --help
803 - accepts special file name "-" for stdin/stdout
808 Specify additional copyright information.
811 Now expects the identity of the package as argument.
815 Most macros, if not all, now strictly follow the `one quotation
816 level' rule. This results in a more predictable expansion.
819 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
820 configure scripts, was fixed by Axel Thimm.
824 Document and ask for the registration of an envvar.
827 Specifies the file which `configure' should look for when trying to
828 find the source tree (used to be handled by AC_INIT).
831 To add new actions to config.status. Should be used instead of
835 Replaces AC_LINK_FILES.
837 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
838 AC_CONFIG_LINKS, and AC_CONFIG_FILES
839 They now obey sh: you should no longer use shell variables as
842 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
843 AC_CONFIG_SUBDIRS($my_subdirs)
847 if test "$package_foo_enabled" = yes; then
848 AC_CONFIG_SUBDIRS(foo)
852 To format an Autoconf macro's help string so that it looks pretty
853 when the user executes `configure --help'.
856 ** Generic Test Macros
858 The interface of the AC_CHECK families of macros (decl, header,
859 type, member, func) is now uniform. They support the same set of
862 - AC_CHECK_DECL, AC_CHECK_DECLS
863 To check whether a symbol is declared.
865 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
866 No longer need a cross-compilation default.
869 The test it performs is much more robust than previously, and makes
870 it possible to test builtin types in addition to typedefs.
871 It is now schizophrenic:
872 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
873 remains for backward compatibility, but its use is discouraged.
874 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
875 behaves exactly like the other AC_CHECK macros.
878 Checks whether given types are supported by the system.
880 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
881 Check for given members in aggregates (e.g., pw_gecos in struct
885 Checks if the compiler supports ISO C, included when needs special
889 Checking whether the preprocessor indicates missing includes by the
890 error code. stderr is checked by AC_TRY_CPP only as a fallback.
893 Takes a language as argument and replaces AC_LANG_C,
894 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
896 - AC_LANG_PUSH, AC_LANG_POP
897 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
900 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
901 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
902 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
909 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
912 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
915 Arrange for large-file support.
917 - AC_EXEEXT, AC_OBJEXT
918 You are no longer expected to use them: their computation is
919 performed by default.
922 Every macro has been revisited in order to support at best CC=c++.
924 Major changes in Autoconf 2.14:
925 There was no release of GNU Autoconf 2.14.
927 Major changes in Autoconf 2.13:
929 Released 1999-05-01 by Ben Elliston.
931 * Support for building on Win32 systems where the only available C or
932 C++ compiler is the Microsoft Visual C++ command line compiler
933 (`cl'). Additional support for building on Win32 systems which are
934 using the Cygwin or Mingw32 environments.
935 * Support for alternative object file and executable file extensions.
936 On Win32, for example, these are .obj and .exe. These are discovered
937 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
938 @EXEEXT@ in the output, respectively.
939 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
940 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
941 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
942 * AC_DEFINE now has an optional third argument for a description to be
943 placed in the config header input file (e.g. config.h.in).
944 * The C++ code fragment compiled for the C++ compiler test had to be
945 improved to include an explicit return type for main(). This was
946 causing failures on systems using recent versions of the EGCS C++
948 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
949 script to report that `sometype_t' was present when only `type_t'
951 * Merge of the FSF version of config.guess and config.sub to modernize
952 these scripts. Add support for a few new hosts in config.guess.
953 Incorporate latest versions of install-sh, mkinstalldirs and
954 texinfo.tex from the FSF.
955 * autoreconf is capable of running automake if necessary (and
957 * Support for Fortran 77. See the Texinfo documentation for details.
958 * Bug fixes and workarounds for quirky bugs in vendor utilities.
960 Major changes in Autoconf 2.12:
962 Released 1996-11-26 by David J. MacKenzie
964 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
965 concatenating multiple input files separated by colons, like so:
966 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
967 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
968 The arguments may be shell variables, to compute the lists on the fly.
969 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
970 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
973 Major changes in Autoconf 2.11:
975 Released November 18th, 1996, by David J. MacKenzie
977 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
978 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
979 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
980 * AC_CONFIG_HEADER expands shell variables in its argument.
981 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
982 * The "checking..." messages and the source code for test programs that
983 fail are saved in config.log.
984 * Another workaround has been added for seds with small command length limits.
985 * config.sub and config.guess recognize more system types.
988 Major changes in Autoconf 2.10:
990 Released May 7th, 1996, by Roland McGrath
993 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
994 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
996 Major changes in Autoconf 2.9:
998 Released March 16th, 1996, by Roland McGrath
1002 Major changes in Autoconf 2.8:
1004 Released March 8th, 1996, by Roland McGrath
1008 Major changes in Autoconf 2.7:
1010 Released November 22nd, 1995, by David J. MacKenzie
1014 Major changes in Autoconf 2.6:
1016 Released November 20th, 1995, by David J. MacKenzie
1020 Major changes in Autoconf 2.5:
1022 Released November 17th, 1995, by Roland McGrath
1024 * New configure options --bindir, --libdir, --datadir, etc., with
1025 corresponding output variables.
1026 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1027 * config.log contains the command being run as well as any output from it.
1028 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1029 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1030 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1031 AC_CHECK_TOOL can search a path other than $PATH.
1032 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1034 Major changes in Autoconf 2.4:
1036 Released June 14th, 1995, by David J. MacKenzie
1038 * Fix a few bugs found by Emacs testers.
1040 Major changes in Autoconf 2.3:
1042 Released March 27th, 1995, by David J. MacKenzie
1044 * Fix the cleanup trap in several ways.
1045 * Handle C compilers that are picky about option placement.
1046 * ifnames gets the version number from the right directory.
1048 Major changes in Autoconf 2.2:
1050 Released March 8th, 1995, by David J. MacKenzie
1052 * The ifnames utility is much faster but requires a "new awk" interpreter.
1053 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1054 library before existing libs, not after, in case it uses them.
1055 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1056 * Lots of bug fixes.
1057 * Many additions to the TODO file :-)
1059 Major changes in Autoconf 2.1:
1061 Released November 4th, 1994, by David J. MacKenzie
1064 * More explanations in the manual.
1065 * Fix a spurious failure in the testsuite.
1066 * Clarify some warning messages.
1067 * autoreconf by default only rebuilds configure and config.h.in files
1068 that are older than any of their particular input files; there is a
1069 --force option to use after installing a new version of Autoconf.
1071 Thanks to everybody who's submitted changes and additions to Autoconf!
1072 I've incorporated many of them, and am still considering others for
1073 future releases -- but I didn't want to postpone this release indefinitely.
1075 Caution: don't indiscriminately rebuild configure scripts with
1076 Autoconf version 2. Some configure.in files need minor adjustments to
1077 work with it; the documentation has a chapter on upgrading. A few
1078 configure.in files, including those for GNU Emacs and the GNU C
1079 Library, need major changes because they relied on undocumented
1080 internals of version 1. Future releases of those packages will have
1081 updated configure.in files.
1083 It's best to use GNU m4 1.3 (or later) with Autoconf version 2.
1084 Autoconf now makes heavy use of m4 diversions, which were implemented
1085 inefficiently in GNU m4 releases before 1.3.
1087 Major changes in Autoconf 2.0:
1089 Released October 26th, 1994, by David J. MacKenzie
1091 ** New copyright terms:
1092 * There are no restrictions on distribution or use of configure scripts.
1095 * Autoconf manual is reorganized to make information easier to find
1096 and has several new indexes.
1097 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1100 * autoscan to generate a preliminary configure.in for a package by
1101 scanning its source code for commonly used nonportable functions,
1102 programs, and header files.
1103 * ifnames to list the symbols used in #if and #ifdef directives in a
1105 * autoupdate to update a configure.in to use the version 2 macro names.
1106 * autoreconf to recursively remake configure and configuration header
1107 files in a source tree.
1109 ** Changed utilities:
1110 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1111 * autoconf and autoheader can look for package-local definition files
1112 in an alternate directory.
1115 * AC_CACHE_VAL to share results of tests between configure runs.
1116 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1117 that macros invoked with AC_REQUIRE don't interrupt other macros.
1118 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1119 support deciding unguessable features based on the host and target types.
1120 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1121 * AC_ARG_PROGRAM to use the options --program-prefix,
1122 --program-suffix, and --program-transform-name to change the names
1123 of programs being installed.
1124 * AC_PREFIX_DEFAULT to change the default installation prefix.
1125 * AC_TRY_COMPILE to compile a test program without linking it.
1126 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1127 * AC_CHECK_LIB to check for a particular function and library.
1128 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1129 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1130 * AC_SUBST_FILE to insert one file into another.
1131 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1132 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1133 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1134 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1137 * Many macros renamed systematically, but old names are accepted for
1138 backward compatibility.
1139 * AC_OUTPUT adds the "automatically generated" comment to
1140 non-Makefiles where it finds @configure_input@ in an input file, to
1141 support files with various comment syntaxes.
1142 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1143 files when they are not enclosed in @ signs.
1144 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1145 override the file name "config.status".
1146 * AC_OUTPUT takes an optional argument for passing variables from
1147 configure to config.status.
1148 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1149 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1150 CPPFLAGS, and LDFLAGS from the environment.
1151 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1152 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1153 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1154 srcdir/../.. by default.
1155 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1156 * AC_DEFINE no longer prints anything, because of the new result reporting
1157 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1158 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1159 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1160 --enable- and --with- options.
1161 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1162 execute on success or failure.
1163 * Checking for C functions in C++ works.
1166 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1167 better maintained with them.
1168 * AC_ARG_ARRAY removed because no one was likely using it.
1169 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1170 take arguments, for consistency with all of the other specific checks.
1173 * Comes with config.sub and config.guess, and uses them optionally.
1174 * Uses config.cache to cache test results. An alternate cache file
1175 can be selected with the --cache-file=FILE option.
1176 * Uses optional shell scripts $prefix/share/config.site and
1177 $prefix/etc/config.site to perform site or system specific initializations.
1178 * configure saves compiler output to ./config.log for debugging.
1179 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1180 * acsite.m4 is the new name for the system-wide aclocal.m4.
1181 * Has a DejaGnu test suite.
1183 Major changes in Autoconf 1.11:
1185 * AC_PROG_INSTALL calls install.sh with the -c option.
1186 * AC_SET_MAKE cleans up after itself.
1187 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1188 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1190 Plus a few other bug fixes.
1192 Major changes in Autoconf 1.10:
1194 * autoheader uses config.h.bot if present, analogous to config.h.top.
1195 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1197 * AC_PROG_CXX looks for cxx as a C++ compiler.
1199 Plus several bugs fixed.
1201 Major changes in Autoconf 1.9:
1203 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1204 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1205 and autoheader generates entries for those names automatically.
1206 * AC_FIND_X gets the result from xmkmf correctly.
1207 * AC_FIND_X assumes no X if --without-x was given.
1208 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1209 * AC_PROG_INSTALL finds OSF/1 installbsd.
1211 Major changes in Autoconf 1.8:
1214 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1215 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1216 for checking both C++ and C features in one configure script.
1217 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1218 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1219 AC_SET_MAKE, AC_ENABLE.
1222 * AC_FIND_X looks for X in more places.
1223 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1224 install.sh is distributed with Autoconf.
1225 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1226 a rewrite of quoting in AC_DEFINE.
1227 * AC_OUTPUT adds its comments in C format when substituting in C files.
1228 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1230 ** New or changed command line options:
1231 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1232 * configure accepts --without-PACKAGE, which sets withval=no.
1233 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1234 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1235 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1236 * configure accepts and ignores most other Cygnus configure options, and
1237 warns about unknown options.
1238 * config.status accepts --help, --version options.
1240 ** File names and other changes:
1241 * Relative srcdir values are not made absolute.
1242 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1243 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1244 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1245 * The example Makefile dependencies for configure et al. work better.
1246 * Namespace cleanup: all shell variables used internally by Autoconf
1247 have names beginning with `ac_'.
1249 More big improvements are in process for future releases, but have not
1250 yet been (variously) finished, integrated, tested, or documented enough
1253 Major changes in Autoconf 1.7:
1255 * New macro AC_OBSOLETE.
1256 * Bugs in Makefile.in fixed.
1257 * AC_LONG_FILE_NAMES improved.
1259 Major changes in Autoconf 1.6:
1261 * New macro AC_LONG_64_BITS.
1262 * Multiple .h files can be created.
1263 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1264 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1265 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1266 * Unused --no-create option to configure removed.
1267 * autoheader doesn't change the timestamp of its output file if
1268 the file didn't change.
1269 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1270 * config.status checks three optional environment variables to
1271 modify its behavior.
1272 * The usual bug fixes.
1274 Major changes in Autoconf 1.5:
1276 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1277 * autoconf and autoheader scripts have GNU standards conforming
1278 --version and --help options (they print their message and exit).
1281 Major changes in Autoconf 1.4:
1283 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1284 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1285 * autoconf and autoheader use the M4 environment variable to determine the
1286 name of the m4 program to use.
1287 * The --macrodir option to autoconf and autoheader specifies the directory
1288 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1289 * autoconf and autoheader can take `-' as their file names, which means to
1290 read stdin as input.
1291 * Resulting configure scripts can take a --verbose option which causes them
1292 to print the results of their tests.
1293 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1294 shell characters, etc. will be preserved during various stages of
1295 expansion done by the shell. If you don't want this, use
1296 AC_DEFINE_UNQUOTED instead.
1297 * Much textual processing done with external calls to tr and sed have been
1298 internalized with builtin m4 `patsubst' and `translit' calls.
1299 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1300 set the shell variables `gen_files' and `gen_config' to the list of
1301 file names to output.
1302 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1303 "lex.yy" or "lexyy", depending on the system.
1304 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1306 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1307 * AC_CONST works much more reliably on more systems.
1310 Major changes in Autoconf 1.3:
1312 configure no longer requires awk for packages that use a config.h.
1313 Support handling --with-PACKAGE options.
1314 New `autoheader' script to create `config.h.in' from `configure.in'.
1315 Ignore troublesome -lucb and -lPW when searching for alloca.
1316 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1317 Improve detection of STDC library.
1318 Add AC_HAVE_LIBRARY to check for non-default libraries.
1319 Function checking should work with future GNU libc releases.
1321 Major changes in Autoconf 1.2:
1323 The --srcdir option is now usually unnecessary.
1324 Add a file containing sample comments describing CPP macros.
1325 A comment in config.status tells which host it was configured on.
1326 Substituted variable values can now contain commas.
1327 Fix bugs in various feature checks.
1329 Major changes in Autoconf 1.1:
1331 Added AC_STRCOLL macro.
1332 Made AC_GETLOADAVG check for more things.
1333 AC_OUTPUT argument is now optional.
1338 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1339 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1341 This file is part of GNU Autoconf.
1343 GNU Autoconf is free software; you can redistribute it and/or modify
1344 it under the terms of the GNU General Public License as published by
1345 the Free Software Foundation; either version 2, or (at your option)
1348 GNU Autoconf is distributed in the hope that it will be useful,
1349 but WITHOUT ANY WARRANTY; without even the implied warranty of
1350 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1351 GNU General Public License for more details.
1353 You should have received a copy of the GNU General Public License
1354 along with GNU Autoconf; see the file COPYING. If not, write to
1355 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
1356 Boston, MA 02110-1301, USA.