1 * Major changes in Autoconf 2.60b (??)
4 Autoconf-generated shell scripts no longer export BIN_SH, due to
5 configuration hassles with this. Installers who need BIN_SH in
6 their environment should set it before invoking 'configure' and
7 'make'. As far as we know, this affects only Unixware installations.
10 The documentation now says that the following macros are obsolescent,
11 as they are superseded by Gnulib:
13 AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
15 New programs should use the Gnulib counterparts of these macros.
16 We have no current plans to remove them from Autoconf.
19 New macro, with the behavior of the 2.60a AC_COMPUTE_INT macro.
20 AC_COMPUTE_INT no longer caches or reports results.
22 ** AC_CHECK_DECL now also works with aggregate objects.
24 ** GNU M4 1.4.7 or later is now recommended.
26 * Major changes in Autoconf 2.60a (2006-08-25)
28 ** GNU M4 1.4.6 or later is now recommended. At least one "make check"
29 test fails with earlier versions of M4.
31 ** The check for C99 now tests for varargs macros, as documented.
32 It also tests that the preprocessor supports 64-bit integers.
34 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
35 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
37 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
38 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
39 two macros are different, so autoupdate will not change the old private name
40 to the new one. _AC_COMPUTE_INT may be removed in a future release.
42 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
43 that long long types be at least 64 bits wide, as C99 and tradition
44 requires. Formerly, they accepted implementations of any width.
47 * Major changes in Autoconf 2.60
49 Released 2006-06-23, by Ralf Wildenhues.
51 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
52 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
53 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
55 ** Provide a way to turn off warnings about the changed directory variables.
57 * Major changes in Autoconf 2.59d
59 Released 2006-06-05, by Ralf Wildenhues.
61 ** GNU make now recommended for VPATH builds
62 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
63 only if you use GNU make. In practice, other 'make' implementations
64 have too many subtle incompatibilities in their support for VPATH.
65 Many packages (including Autoconf itself) are portable to other
66 'make' implementations, but some packages are not, and recommending
67 GNU make keeps the installation instructions simpler.
69 ** Even more safety checks for the new Directory variables:
70 Warn about suspicious `${datarootdir}' found in config files output.
72 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
73 These never-documented macros and variables have been marked with
74 comments saying that they may be removed in a future release,
75 because their use can lead to unintended code being executed.
76 If you need functionality that only these macros or variables
77 currently supply, please write bug-autoconf@gnu.org.
79 ** AC_SUBST, AC_DEFINE
80 Literal arguments to these are passed to m4_pattern_allow now.
83 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
84 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
85 obsolete K&R tests in the Automake test suite.
94 Now more robust with special characters in file names, or when
95 multiple processes create the same directory at the same time.
98 The documentation now says that the following macros are obsolescent:
99 they test for problems that are so old that they are no longer of
100 practical importance on current systems.
102 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
103 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
104 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
105 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
106 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
107 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
108 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
109 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
111 New programs need not use these macros. We have no current plans to
115 For compatibility with future Libtool 2.0, autoreconf will invoke
116 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
119 * Major changes in Autoconf 2.59c
121 Released 2006-04-12, by Ralf Wildenhues.
123 ** The configure command now redirects standard input from /dev/null,
124 to help avoid problems with subsidiary commands that might mistakenly
125 read standard input. AS_ORIGINAL_STDIN_FD points to the original
126 standard input before this redirection, if you really want configure to
127 read from standard input.
129 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
130 The following directory variables are new:
132 datarootdir read-only architecture-independent data root [PREFIX/share]
133 localedir locale-specific message catalogs [DATAROOTDIR/locale]
134 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
135 htmldir html documentation [DOCDIR]
136 dvidir dvi documentation [DOCDIR]
137 pdfdir pdf documentation [DOCDIR]
138 psdir ps documentation [DOCDIR]
140 The following variables have new default values:
142 datadir read-only architecture-independent data [DATAROOTDIR]
143 infodir info documentation [DATAROOTDIR/info]
144 mandir man documentation [DATAROOTDIR/man]
146 This means that if you use any of `@datadir@', `@infodir@', or
147 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
148 defined in this file. As a temporary measure, if any of those are
149 found but no mention of `datarootdir', the substitutions will be
150 replaced with values that do not contain `${datarootdir}', and a
151 warning will be issued.
153 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
154 a trailing slash. Similar change will be made to ac_top_builddir in a
155 future release; the old style value, which matches (../)*, is (and will
156 continue to be) available as ac_top_build_prefix.
159 New macro to check for support of 'typeof' syntax a la GNU C.
161 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
162 New "once-only" variants of commonly-used macros, to make 'configure'
163 smaller and faster in common cases.
166 New macro to check for strtold with C99 semantics.
169 New macro that lets builder disable assertions at 'configure'-time.
172 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
173 X11/Intrinsic.h and XtMalloc (Xt).
175 ** AC_PRESERVE_HELP_ORDER
176 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
177 and AC_ARG_WITH arguments in one region, in the order defined. The default
178 behavior is to group options of each classes separately.
180 ** AC_PROG_CC, AC_PROG_CXX
181 No longer automatically arrange to declare the 'exit' function of C,
182 when a C++ compiler is used. Standard Autoconf macros no longer use
183 'exit', so this is no longer an issue for them. If you use C++, and
184 want to call 'exit', you'll have to arrange for its declaration
185 yourself. But we now suggest you return from 'main' instead.
187 ** AC_PROG_CC_C89, AC_PROG_CC_C99
188 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
189 check for ANSI C89 and ISO C99 support respectively.
192 Has been unobsoleted, and will check if the compiler supports ISO
193 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
194 retained for backwards compatibility, assuming the value of
195 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
198 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
199 New macros for checking commonly-used members of struct dirent.
202 The substituted value can now contain newlines.
205 The substitution now occurs only when @variable@ is on a line by itself,
206 optionally surrounded by spaces and tabs. The whole line is replaced.
208 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
209 New macros to check for long double, and whether it is wider than double.
210 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
211 applications should switch to the new macro.
213 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
214 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
215 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
216 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
217 New macros to check for C99 and POSIX types.
219 ** AC_USE_SYSTEM_EXTENSIONS
220 New macro to enable extensions to Posix.
223 New macro which is defined to the name of the first declared config header
224 or undefined if no config headers have been declared yet.
227 The macro correctly handles quadrigraphs now.
229 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
230 These macros are new or published now.
233 New macro for copyright notices in testsuite files.
235 ** ALLOCA, LIBOBJS, LTLIBOBJS
236 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
237 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
238 `Makefile.in' in case the object files lie in a different directory.
239 The LIBOBJDIR feature is experimental.
242 Supports --no-recursive now.
244 ** New macros to support Erlang/OTP.
245 New macros for configuring paths to Erlang tools and libraries:
246 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
247 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
248 AC_ERLANG_SUBST_LIB_DIR.
250 New macros for configuring installation of Erlang libraries:
251 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
253 ** The manual now mentions Gnulib more prominently.
255 ** New macros to support Objective C.
256 AC_PROG_OBJC, AC_PROG_OBJCPP.
258 * Major changes in Autoconf 2.59b
260 Released 2004-08-20, by Paul Eggert.
263 New macro that computes the default alignment of a type.
265 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
266 When cross-compiling, these macros will give a warning if the tool
267 is not prefixed. In the future, unprefixed cross tools will not
268 be detected; please consult the info documentation for information
269 about the reason of this change.
271 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
272 New macros that detect programs whose name is prefixed with the
273 target type, if the build type and target type are different.
275 ** AC_REQUIRE_AUX_FILE
276 New trace macro that declares expected auxiliary files.
279 New macro that tests for a grep program that accepts as a long a line
282 ** AC_PROG_EGREP, AC_PROG_FGREP
283 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
284 FGREP="$GREP -F" respectively if possible, or else run a path search for
285 a program that accepts as long a line as possible.
288 New macro that tests for a sed program that truncates as few characters
291 * Major changes in Autoconf 2.59
293 Released 2003-11-04, by Akim Demaille
295 ** ac_abs_builddir etc.
296 Absolute file names were actually relative in 2.58.
298 * Major changes in Autoconf 2.58
300 Released 2003-11-04, by Akim Demaille
303 core.* files are no longer removed, as they may be valid user files.
305 ** autoreconf and auxiliary directory
306 Autoreconf creates the auxiliary directory if needed. This is
307 especially useful for initial "bootstrapping" of fresh CVS checkouts.
309 ** AC_CONFIG_MACRO_DIR
310 Use this macro to declare the directory for local M4 macros for aclocal.
313 No longer includes twice the same file in LIBOBJS if invoked
316 ** AC_CONFIG_COMMANDS
317 The directory for its first argument is automatically created. For
320 AC_CONFIG_COMMANDS([src/modules.hh], [...])
322 $top_builddir/src/ is created if needed.
324 ** Autotest and local.at
325 The optional file local.at is always included in Autotest test suites.
328 The warnings are always issued, including with cached runs.
329 This became a significant problem since aclocal and automake can
330 run autoconf behind the scene.
332 ** autoheader warnings
333 The warnings of autoheader can be turned off, using --warning.
334 For instance, -Wno-obsolete disables the complaints about acconfig.h
335 and other deprecated constructs.
338 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
341 ** AC_DECL_SYS_SIGLIST
345 Now checks that mktime is the inverse of localtime.
347 ** Improve DJGPP portability
348 The Autoconf tools and configure behave better under DJGPP.
350 ** Present But Cannot Be Compiled
351 New FAQ section dedicated to the mystic
353 configure: WARNING: pi.h: present but cannot be compiled
354 configure: WARNING: pi.h: check for missing prerequisite headers?
355 configure: WARNING: pi.h: proceeding with the preprocessor's result
358 ** Concurrent executions of autom4te
359 autom4te now locks its internal files, which enables concurrent
360 executions of autom4te, likely to happen if automake, autoconf,
361 autoheader etc. are run simultaneously.
364 Use of Libtool 1.5 and higher is encouraged. Compatibility with
365 Libtool pre-1.4 is not checked.
368 Testsuites no longer rerun failed tests in verbose mode; instead,
369 failures are logged while the test is run.
371 In addition, expected failures can be marked as such.
373 * Major changes in Autoconf 2.57
375 Released 2002-12-03 by Paul Eggert.
377 Bug fixes for problems with AIX linker, with freestanding C compilers,
378 with GNU M4 limitations, and with obsolete copies of GNU documents.
380 The Free Documentation License has been upgraded from 1.1 to 1.2.
382 * Major changes in Autoconf 2.56
384 Released 2002-11-15 by Akim Demaille.
386 One packaging problem fixed (config/install-sh was not executable).
388 * Major changes in Autoconf 2.55
390 Released 2002-11-14 by Akim Demaille.
394 Have your configure.ac checked by autoscan ("autoscan").
395 Try the warning options ("autoreconf -fv -Wall").
399 - AC_CHECK_HEADER, AC_CHECK_HEADERS
400 More information on proper use.
402 - Writing Test Programs
404 This sections explains how to write good test sources to use with
405 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
407 - AC_FOO_IFELSE vs. AC_TRY_FOO
409 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
410 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
414 - Is more robust to different Gettext installations.
416 - Produces messages (when --verbose) to be understood by Emacs'
419 - Supports -W/--warnings.
422 Once the GNU Build System reinstalled, run `./config.status
423 --recheck && ./config.status && make' if possible.
427 - Supports --cache, and --no-cache.
429 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
430 (autom4te.cache). See `Customizing autom4te' in the documentation.
437 Support for the obsoleted options -m, --macrodir, -l, --localdir is
438 dropped in favor of the safer --include/--prepend-include scheme.
443 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
444 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
445 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
448 Obsoleted macros are kept for Autoconf backward compatibility, but
449 should be avoided in configure.ac. Running autoupdate is advised.
452 - AC_DEFINE/AC_DEFINE_UNQUOTED
454 We have to stop using the old compatibility scheme --that tried to
455 avoid useless backslashes-- because Libtool 1.4.3 contains a
457 AC_DEFINE([error_t], [int],
458 [Define to a type to use for \`error_t' if it is not
459 otherwise available.])
461 We have to quote the single quotes and backslashes with \. The old
462 compatibility scheme saw that ` was backslashed, and therefore did
463 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
464 compatible with Libtool. Autoconf 2.55 is, but in some cases might
465 produce more \ than wanted.
467 Please, note that in the future the same problem will happen with
468 AC_MSG_*: use `autoreconf -f -Wall'.
472 - Portability of the Autoconf package to Solaris.
474 - Spurious warnings caused by config.status.
475 This bug is benign, but painful: on some systems (typically
476 FreeBSD), warnings such as:
478 config.status: creating Makefile
479 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
481 could be issued. This is fixed.
484 Simultaneous executions of config.status are possible again.
486 - Precious variables accumulation
488 config.status could stack several copies of the precious variables
492 ** Plans for later versions
496 The compatibility hooks with the old scheme will be completely
497 removed. Please, advice/use `--build', `--host', and `--target'
500 - AC_CHECK_HEADER, AC_CHECK_HEADERS
502 The tests will be stricter, please make sure your invocations are
507 Shell functions will gradually be introduced, probably starting with
508 Autotest. If you know machines which are in use that you suspect
509 *not* to support shell functions, please run the test suite of
510 Autoconf 2.55 on it, and report the results to
511 bug-autoconf@gnu.org.
515 Special characters in AC_MSG_* need not be quoted. Currently,
516 Autoconf has heuristics to decide when a string is escaped, or has
517 to be escaped. This scheme is fragile, and will be removed; the
518 only risk is uglified messages. Please, run `autoreconf -f -Wall'
519 to find occurrences that will be affected.
521 * Major changes in Autoconf 2.54
523 Released 2002-09-13 by Akim Demaille.
527 - autoreconf no longer changes the version of the gettext/po/intl
528 support files. It now adds the files the correspond to the
529 AM_GNU_GETTEXT_VERSION declared in configure.ac.
531 Warning: It now relies on the 'autopoint' program, which is part
532 of GNU gettext 0.11.4 and newer.
534 Please note that you need to have a GNU gettext version that
535 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
536 in configure.ac. You can upgrade to newer GNU gettext versions,
537 though, without needing to change configure.ac.
539 - The -I DIR or --include=DIR option now appends DIR to the include path
540 instead of prepending; this is for consistency with other GNU tools.
541 The new -B DIR or --prepend-include=DIR option has the old behavior.
546 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
547 Please, remove lines such as
549 # This is necessary so that .o files in LIBOBJS are also
550 # built via the ANSI2KNR-filtering rules.
551 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
553 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
554 your Makefiles either.
556 - AC_CONFIG_LINKS now makes copies if it can't make links.
558 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
559 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
560 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
562 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
564 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
566 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
570 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
571 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
572 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
575 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
578 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
579 for an AC_LIBOBJ replacement.
583 - Spurious complaints from `m4_bmatch' about invalid regular
584 expressions are suppressed.
586 - Empty top_builddirs are properly handled.
588 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
591 Now colon in the optional path arguments are properly handled.
593 ** Improved portability
595 - Both Autoconf the package, and the scripts it produces, should run
596 more reliably with Zsh. Bear in mind it is the default Bourne shell
599 - Autoconf and the scripts it produces no longer assume the existence of
600 the obsolescent commands egrep and fgrep.
604 - Limitations of Make
608 The GNATS base moved to
609 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
610 (It is no longer available, though.)
615 Now contains the list of ouput variables and files (AC_SUBST,
618 * Major changes in Autoconf 2.53
620 Released 2002-03-08 by Akim Demaille.
624 Perl 5.005_03 or later is required: autom4te is written in Perl and is
625 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
631 Argument requirements, output variables, defined macros.
632 - M4sugar, M4sh, Autotest
634 - Double quoting macros
635 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
637 The Autoconf manual is now distributed under the terms of the GNU FDL.
638 - Section `Hosts and Cross-Compilation'
639 Explains the rationale for the 2.5x changes in the cross-compilation
640 chain, and in the relationships between build, host, and target
642 Emphasizes that `cross-compilation' == `--host is given'.
643 If you are working on compilers etc., be sure to read this section.
644 - Section `AC_LIBOBJ vs. LIBOBJS'
645 Explains why assigning LIBOBJS directly is now an error.
646 Details how to update the code.
651 Now used instead of hard coded line numbers.
652 This eases the comparison of `configure's, and diminishes the
653 pressure over control version archives.
654 Automatic replacement for shells that don't support this feature.
655 - New output variables
656 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
661 Autoconf and Autotest modes are provided.
666 New, used by the Autoconf suite to cache and speed up most processing.
668 Supported by autom4te, autoconf and autoheader.
670 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
671 autoupdate, and autoreconf.
673 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
674 automake options are to be given via AUTOMAKE_OPTIONS.
676 Runs gettextize and libtoolize when appropriate.
678 --m4dir is no longer supported.
680 Now runs only in the specified directories, defaulting to `.',
681 but understands AC_CONFIG_SUBDIRS for dependent directories.
682 Before, it used to run on all the `configure.ac' found in the
684 Independent packages are properly updated.
688 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
690 Under the user pressure, $? is finally available. Probably a mistake.
691 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
692 - Precious variables accumulation
693 config.status could stack several copies of the precious variables
695 - AC_PATH_PROG and family.
696 Works properly when given a literal path.
698 Somewhere since 2.13, the result had been reversed.
702 - AC_C_BIGENDIAN supports the cross-compiling case.
703 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
704 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
705 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
707 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
708 precision than `double'.
713 It now defines the preprocessor symbols PACKAGE_NAME,
714 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
718 Admits a fourth optional parameter: the tar name.
720 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
721 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
722 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
725 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
726 Are much less expensive when using long lists of files.
729 Works with shell variables, and non alphanumeric names.
733 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
734 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
736 - AC_FUNC_STRTOD substitutes POW_LIB.
741 * Major changes in Autoconf 2.52
743 Released 2001-07-18 by Akim Demaille.
748 This feature was present in autoconf 2.50 but was not documented.
749 For example, `@<:@' is translated to `[' just before output. This
750 is useful when writing strings that contain unbalanced quotes, or
751 other hard-to-quote constructs.
752 - m4_pattern_forbid, m4_pattern_allow
753 - Tips for upgrading from 2.13.
754 - Using autoscan to maintain a configure.ac.
757 - Now include stdint.h.
758 - sys/types.h and sys/stat.h are guarded.
759 - strings.h is included if available, and not conflicting with string.h.
762 - The test suite is more robust and presents less false failures.
763 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
764 - configure accepts --prefix='' again.
765 - AC_CHECK_LIB works properly when its first argument is not a
767 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
768 - build_, host_, and target_alias are AC_SUBST as in 2.13.
769 - AC_ARG_VAR properly propagates precious variables inherited from the
770 environment to ./config.status.
771 - Using --program-suffix/--program-prefix is portable.
772 - Failures to detect the default compiler's output extension are less
774 - `config.status foo' works properly when `foo' depends on variables
775 set in an AC_CONFIG_THING INIT-CMD.
776 - autoheader is more robust to broken input.
777 - Fixed Fortran name-mangling and link tests on a number of systems,
778 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
781 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
782 specify pre-includes. In this case, the headers are compiled with
783 cc, not merely preprocessed by cpp. Therefore it is the _usability_
784 of a header which is checked for, not just its availability.
785 - AC_ARG_VAR refuses to run configure when precious variables have
787 - Versions of compilers are dumped in the logs.
788 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
791 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
792 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
793 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
794 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
795 Be sure to read `Upgrading from Version 2.13' to understand why
796 running `autoupdate' is needed.
797 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
798 a main-like routine is required/possible when linking C/C++ with
799 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
800 - AC_FUNC_GETPGRG behaves better when cross-compiling.
802 * Major changes in Autoconf 2.51
803 There was no release of Autoconf 2.51 since some packagers had used
804 this version number without permission to ship intermediary versions
805 of 2.50. The version was skipped to avoid confusion.
807 * Major changes in Autoconf 2.50
809 Released 2001-05-21 by Akim Demaille.
812 There have been far too many to enumerate them here. Check out
813 ChangeLog if you really want to know more.
815 ** Improved documentation
816 In particular, portability issues are better covered.
819 All the standard GNU Makefile targets are supported. The layout has
820 changed: m4/ holds the M4 extensions Autoconf needs for its
821 configuration, doc/ contains the documentation, and tests/ contains
824 ** Man pages are provided
825 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
826 config.guess, config.sub.
830 Provides a safe and powerful means to trace the macro uses. This
831 provide the parsing layer for tools which need to `study'
835 Specify what category of warnings should be enabled.
837 - When recursing into subdirectories, try for configure.gnu before
838 configure to adapt for packages not using autoconf on case-insensitive
842 More errors are now caught (circular AC_REQUIRE dependencies,
843 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
844 etc.). In addition, their location and call stack are given.
847 autoupdate is much more powerful, and is able to provide the glue code
848 which might be needed to move from an old macro to its newer
851 You are strongly encouraged to use it to modernize both your
852 `configure.in' and your .m4 extension files.
855 The internal machinery of autoheader has completely changed. As a
856 result, using `acconfig.h' should be considered to be obsoleted, and
857 you are encouraged to get rid of it using the AH macros.
862 ** Fortran 77 compilers
863 Globally, the support for Fortran 77 is considerably improved.
865 Support for automatically determining a Fortran 77 compiler's
866 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
867 provided to wrap C/C++ identifiers, thus making it easier and more
868 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
869 call C/C++ routines. See the Texinfo documentation for details.
872 The test suite no longer uses DejaGNU. It should be easy to submit
873 test cases in this new framework.
876 - --help, --help=long, -hl
877 no longer dumps useless items.
879 lists only specific options.
880 - --help=recursive, -hr
881 displays the help of all the embedded packages.
882 - Remembers environment variables when reconfiguring.
883 The previous scheme to set envvar before running configure was
885 what prevented configure from remembering the environment in which
886 it was run, therefore --recheck was run in an inconsistent
887 environment. Now, one should run
889 and then --recheck will work properly. Variables declared with
890 AC_ARG_VAR are also preserved.
892 $build defaults to `config.guess`, $host to $build, and then $target
894 Cross-compilation is a global status of the package, it no longer
895 depends upon the current language.
896 Cross compilation is enabled iff the user specified `--host'.
897 `configure' now fails if it can't run the executables it compiles,
898 unless cross-compilation is enabled.
900 The cache file is disabled by default. The new options
901 `--config-cache', `-C' set the cache to `config.cache'.
905 Much faster on most architectures.
906 - concurrent executions
907 It is safe to use `make -j' with config.status.
908 - human interface improved
909 It is possible to invoke
910 ./config.status foobar
911 instead of the former form (still valid)
912 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
913 CONFIG_FILES=foobar:foo.in:bar.in \
915 The same holds for configuration headers and links.
916 You can instantiate unknown files and headers:
917 ./config.status --header foo.h:foo.h.in --file bar:baz
918 - has a useful --help
919 - accepts special file name "-" for stdin/stdout
924 Specify additional copyright information.
927 Now expects the identity of the package as argument.
931 Most macros, if not all, now strictly follow the `one quotation
932 level' rule. This results in a more predictable expansion.
935 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
936 configure scripts, was fixed by Axel Thimm.
940 Document and ask for the registration of an envvar.
943 Specifies the file which `configure' should look for when trying to
944 find the source tree (used to be handled by AC_INIT).
947 To add new actions to config.status. Should be used instead of
951 Replaces AC_LINK_FILES.
953 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
954 AC_CONFIG_LINKS, and AC_CONFIG_FILES
955 They now obey sh: you should no longer use shell variables as
958 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
959 AC_CONFIG_SUBDIRS($my_subdirs)
963 if test "$package_foo_enabled" = yes; then
964 AC_CONFIG_SUBDIRS(foo)
968 To format an Autoconf macro's help string so that it looks pretty
969 when the user executes `configure --help'.
972 ** Generic Test Macros
974 The interface of the AC_CHECK families of macros (decl, header,
975 type, member, func) is now uniform. They support the same set of
978 - AC_CHECK_DECL, AC_CHECK_DECLS
979 To check whether a symbol is declared.
981 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
982 No longer need a cross-compilation default.
985 The test it performs is much more robust than previously, and makes
986 it possible to test builtin types in addition to typedefs.
987 It is now schizophrenic:
988 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
989 remains for backward compatibility, but its use is discouraged.
990 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
991 behaves exactly like the other AC_CHECK macros.
994 Checks whether given types are supported by the system.
996 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
997 Check for given members in aggregates (e.g., pw_gecos in struct
1001 Checks if the compiler supports ISO C, included when needs special
1005 Checking whether the preprocessor indicates missing includes by the
1006 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1009 Takes a language as argument and replaces AC_LANG_C,
1010 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1012 - AC_LANG_PUSH, AC_LANG_POP
1013 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1016 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1017 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1018 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1022 Sets GETGROUPS_LIBS.
1024 - AC_FUNC_GETLOADAVG
1025 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1028 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1031 Arrange for large-file support.
1033 - AC_EXEEXT, AC_OBJEXT
1034 You are no longer expected to use them: their computation is
1035 performed by default.
1037 ** C++ compatibility
1038 Every macro has been revisited in order to support at best CC=c++.
1040 Major changes in Autoconf 2.14:
1041 There was no release of GNU Autoconf 2.14.
1043 Major changes in Autoconf 2.13:
1045 Released 1999-05-01 by Ben Elliston.
1047 * Support for building on Win32 systems where the only available C or
1048 C++ compiler is the Microsoft Visual C++ command line compiler
1049 (`cl'). Additional support for building on Win32 systems which are
1050 using the Cygwin or Mingw32 environments.
1051 * Support for alternative object file and executable file extensions.
1052 On Win32, for example, these are .obj and .exe. These are discovered
1053 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1054 @EXEEXT@ in the output, respectively.
1055 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1056 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1057 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1058 * AC_DEFINE now has an optional third argument for a description to be
1059 placed in the config header input file (e.g. config.h.in).
1060 * The C++ code fragment compiled for the C++ compiler test had to be
1061 improved to include an explicit return type for main(). This was
1062 causing failures on systems using recent versions of the EGCS C++
1064 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1065 script to report that `sometype_t' was present when only `type_t'
1067 * Merge of the FSF version of config.guess and config.sub to modernize
1068 these scripts. Add support for a few new hosts in config.guess.
1069 Incorporate latest versions of install-sh, mkinstalldirs and
1070 texinfo.tex from the FSF.
1071 * autoreconf is capable of running automake if necessary (and
1073 * Support for Fortran 77. See the Texinfo documentation for details.
1074 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1076 Major changes in Autoconf 2.12:
1078 Released 1996-11-26 by David J. MacKenzie
1080 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1081 concatenating multiple input files separated by colons, like so:
1082 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1083 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1084 The arguments may be shell variables, to compute the lists on the fly.
1085 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1086 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1089 Major changes in Autoconf 2.11:
1091 Released November 18th, 1996, by David J. MacKenzie
1093 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1094 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1095 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1096 * AC_CONFIG_HEADER expands shell variables in its argument.
1097 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1098 * The "checking..." messages and the source code for test programs that
1099 fail are saved in config.log.
1100 * Another workaround has been added for seds with small command length limits.
1101 * config.sub and config.guess recognize more system types.
1104 Major changes in Autoconf 2.10:
1106 Released May 7th, 1996, by Roland McGrath
1109 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1110 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1112 Major changes in Autoconf 2.9:
1114 Released March 16th, 1996, by Roland McGrath
1118 Major changes in Autoconf 2.8:
1120 Released March 8th, 1996, by Roland McGrath
1124 Major changes in Autoconf 2.7:
1126 Released November 22nd, 1995, by David J. MacKenzie
1130 Major changes in Autoconf 2.6:
1132 Released November 20th, 1995, by David J. MacKenzie
1136 Major changes in Autoconf 2.5:
1138 Released November 17th, 1995, by Roland McGrath
1140 * New configure options --bindir, --libdir, --datadir, etc., with
1141 corresponding output variables.
1142 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1143 * config.log contains the command being run as well as any output from it.
1144 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1145 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1146 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1147 AC_CHECK_TOOL can search a path other than $PATH.
1148 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1150 Major changes in Autoconf 2.4:
1152 Released June 14th, 1995, by David J. MacKenzie
1154 * Fix a few bugs found by Emacs testers.
1156 Major changes in Autoconf 2.3:
1158 Released March 27th, 1995, by David J. MacKenzie
1160 * Fix the cleanup trap in several ways.
1161 * Handle C compilers that are picky about option placement.
1162 * ifnames gets the version number from the right directory.
1164 Major changes in Autoconf 2.2:
1166 Released March 8th, 1995, by David J. MacKenzie
1168 * The ifnames utility is much faster but requires a "new awk" interpreter.
1169 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1170 library before existing libs, not after, in case it uses them.
1171 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1172 * Lots of bug fixes.
1173 * Many additions to the TODO file :-)
1175 Major changes in Autoconf 2.1:
1177 Released November 4th, 1994, by David J. MacKenzie
1180 * More explanations in the manual.
1181 * Fix a spurious failure in the testsuite.
1182 * Clarify some warning messages.
1183 * autoreconf by default only rebuilds configure and config.h.in files
1184 that are older than any of their particular input files; there is a
1185 --force option to use after installing a new version of Autoconf.
1187 Thanks to everybody who's submitted changes and additions to Autoconf!
1188 I've incorporated many of them, and am still considering others for
1189 future releases -- but I didn't want to postpone this release indefinitely.
1191 Caution: don't indiscriminately rebuild configure scripts with
1192 Autoconf version 2. Some configure.in files need minor adjustments to
1193 work with it; the documentation has a chapter on upgrading. A few
1194 configure.in files, including those for GNU Emacs and the GNU C
1195 Library, need major changes because they relied on undocumented
1196 internals of version 1. Future releases of those packages will have
1197 updated configure.in files.
1199 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1200 Autoconf now makes heavy use of M4 diversions, which were implemented
1201 inefficiently in GNU M4 releases before 1.3.
1203 Major changes in Autoconf 2.0:
1205 Released October 26th, 1994, by David J. MacKenzie
1207 ** New copyright terms:
1208 * There are no restrictions on distribution or use of configure scripts.
1211 * Autoconf manual is reorganized to make information easier to find
1212 and has several new indexes.
1213 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1216 * autoscan to generate a preliminary configure.in for a package by
1217 scanning its source code for commonly used nonportable functions,
1218 programs, and header files.
1219 * ifnames to list the symbols used in #if and #ifdef directives in a
1221 * autoupdate to update a configure.in to use the version 2 macro names.
1222 * autoreconf to recursively remake configure and configuration header
1223 files in a source tree.
1225 ** Changed utilities:
1226 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1227 * autoconf and autoheader can look for package-local definition files
1228 in an alternate directory.
1231 * AC_CACHE_VAL to share results of tests between configure runs.
1232 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1233 that macros invoked with AC_REQUIRE don't interrupt other macros.
1234 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1235 support deciding unguessable features based on the host and target types.
1236 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1237 * AC_ARG_PROGRAM to use the options --program-prefix,
1238 --program-suffix, and --program-transform-name to change the names
1239 of programs being installed.
1240 * AC_PREFIX_DEFAULT to change the default installation prefix.
1241 * AC_TRY_COMPILE to compile a test program without linking it.
1242 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1243 * AC_CHECK_LIB to check for a particular function and library.
1244 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1245 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1246 * AC_SUBST_FILE to insert one file into another.
1247 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1248 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1249 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1250 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1253 * Many macros renamed systematically, but old names are accepted for
1254 backward compatibility.
1255 * AC_OUTPUT adds the "automatically generated" comment to
1256 non-Makefiles where it finds @configure_input@ in an input file, to
1257 support files with various comment syntaxes.
1258 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1259 files when they are not enclosed in @ signs.
1260 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1261 override the file name "config.status".
1262 * AC_OUTPUT takes an optional argument for passing variables from
1263 configure to config.status.
1264 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1265 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1266 CPPFLAGS, and LDFLAGS from the environment.
1267 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1268 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1269 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1270 srcdir/../.. by default.
1271 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1272 * AC_DEFINE no longer prints anything, because of the new result reporting
1273 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1274 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1275 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1276 --enable- and --with- options.
1277 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1278 execute on success or failure.
1279 * Checking for C functions in C++ works.
1282 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1283 better maintained with them.
1284 * AC_ARG_ARRAY removed because no one was likely using it.
1285 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1286 take arguments, for consistency with all of the other specific checks.
1289 * Comes with config.sub and config.guess, and uses them optionally.
1290 * Uses config.cache to cache test results. An alternate cache file
1291 can be selected with the --cache-file=FILE option.
1292 * Uses optional shell scripts $prefix/share/config.site and
1293 $prefix/etc/config.site to perform site or system specific initializations.
1294 * configure saves compiler output to ./config.log for debugging.
1295 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1296 * acsite.m4 is the new name for the system-wide aclocal.m4.
1297 * Has a DejaGnu test suite.
1299 Major changes in Autoconf 1.11:
1301 * AC_PROG_INSTALL calls install.sh with the -c option.
1302 * AC_SET_MAKE cleans up after itself.
1303 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1304 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1306 Plus a few other bug fixes.
1308 Major changes in Autoconf 1.10:
1310 * autoheader uses config.h.bot if present, analogous to config.h.top.
1311 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1313 * AC_PROG_CXX looks for cxx as a C++ compiler.
1315 Plus several bugs fixed.
1317 Major changes in Autoconf 1.9:
1319 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1320 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1321 and autoheader generates entries for those names automatically.
1322 * AC_FIND_X gets the result from xmkmf correctly.
1323 * AC_FIND_X assumes no X if --without-x was given.
1324 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1325 * AC_PROG_INSTALL finds OSF/1 installbsd.
1327 Major changes in Autoconf 1.8:
1330 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1331 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1332 for checking both C++ and C features in one configure script.
1333 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1334 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1335 AC_SET_MAKE, AC_ENABLE.
1338 * AC_FIND_X looks for X in more places.
1339 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1340 install.sh is distributed with Autoconf.
1341 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1342 a rewrite of quoting in AC_DEFINE.
1343 * AC_OUTPUT adds its comments in C format when substituting in C files.
1344 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1346 ** New or changed command line options:
1347 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1348 * configure accepts --without-PACKAGE, which sets withval=no.
1349 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1350 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1351 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1352 * configure accepts and ignores most other Cygnus configure options, and
1353 warns about unknown options.
1354 * config.status accepts --help, --version options.
1356 ** File names and other changes:
1357 * Relative srcdir values are not made absolute.
1358 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1359 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1360 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1361 * The example Makefile dependencies for configure et al. work better.
1362 * Namespace cleanup: all shell variables used internally by Autoconf
1363 have names beginning with `ac_'.
1365 More big improvements are in process for future releases, but have not
1366 yet been (variously) finished, integrated, tested, or documented enough
1369 Major changes in Autoconf 1.7:
1371 * New macro AC_OBSOLETE.
1372 * Bugs in Makefile.in fixed.
1373 * AC_LONG_FILE_NAMES improved.
1375 Major changes in Autoconf 1.6:
1377 * New macro AC_LONG_64_BITS.
1378 * Multiple .h files can be created.
1379 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1380 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1381 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1382 * Unused --no-create option to configure removed.
1383 * autoheader doesn't change the timestamp of its output file if
1384 the file didn't change.
1385 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1386 * config.status checks three optional environment variables to
1387 modify its behavior.
1388 * The usual bug fixes.
1390 Major changes in Autoconf 1.5:
1392 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1393 * autoconf and autoheader scripts have GNU standards conforming
1394 --version and --help options (they print their message and exit).
1397 Major changes in Autoconf 1.4:
1399 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1400 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1401 * autoconf and autoheader use the M4 environment variable to determine the
1402 name of the M4 program to use.
1403 * The --macrodir option to autoconf and autoheader specifies the directory
1404 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1405 * autoconf and autoheader can take `-' as their file names, which means to
1406 read stdin as input.
1407 * Resulting configure scripts can take a --verbose option which causes them
1408 to print the results of their tests.
1409 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1410 shell characters, etc. will be preserved during various stages of
1411 expansion done by the shell. If you don't want this, use
1412 AC_DEFINE_UNQUOTED instead.
1413 * Much textual processing done with external calls to tr and sed have been
1414 internalized with builtin M4 `patsubst' and `translit' calls.
1415 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1416 set the shell variables `gen_files' and `gen_config' to the list of
1417 file names to output.
1418 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1419 "lex.yy" or "lexyy", depending on the system.
1420 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1422 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1423 * AC_CONST works much more reliably on more systems.
1426 Major changes in Autoconf 1.3:
1428 configure no longer requires awk for packages that use a config.h.
1429 Support handling --with-PACKAGE options.
1430 New `autoheader' script to create `config.h.in' from `configure.in'.
1431 Ignore troublesome -lucb and -lPW when searching for alloca.
1432 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1433 Improve detection of STDC library.
1434 Add AC_HAVE_LIBRARY to check for non-default libraries.
1435 Function checking should work with future GNU libc releases.
1437 Major changes in Autoconf 1.2:
1439 The --srcdir option is now usually unnecessary.
1440 Add a file containing sample comments describing CPP macros.
1441 A comment in config.status tells which host it was configured on.
1442 Substituted variable values can now contain commas.
1443 Fix bugs in various feature checks.
1445 Major changes in Autoconf 1.1:
1447 Added AC_STRCOLL macro.
1448 Made AC_GETLOADAVG check for more things.
1449 AC_OUTPUT argument is now optional.
1454 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1455 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1457 This file is part of GNU Autoconf.
1459 GNU Autoconf is free software; you can redistribute it and/or modify
1460 it under the terms of the GNU General Public License as published by
1461 the Free Software Foundation; either version 2, or (at your option)
1464 GNU Autoconf is distributed in the hope that it will be useful,
1465 but WITHOUT ANY WARRANTY; without even the implied warranty of
1466 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1467 GNU General Public License for more details.
1469 You should have received a copy of the GNU General Public License
1470 along with GNU Autoconf; see the file COPYING. If not, write to
1471 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
1472 Boston, MA 02110-1301, USA.