1 * Major changes in Autoconf 2.61a (??)
3 ** AC_FUNC_SETVBUF_REVERSED is now obsolete. It is still defined for backward
4 compatibility but it does nothing. The macro was already
5 obsolescent, as the last systems to have the problem were those
6 based on SVR2, which became obsolete in 1987. The macro had bugs
7 on some modern systems and could no longer be maintained reliably
8 due to lack of ancient systems to test it on.
10 ** config.status now uses awk instead of sed for most substitutions, for speed.
11 It is now documented that Makefile.in should not contain
12 overlapping variable occurrences, e.g., @VAR1@VAR2@. Autoconf's
13 behavior was always iffy in such cases, and the awk implementation
14 has changed the behavior.
16 * Major changes in Autoconf 2.61 (2006-11-17)
18 ** New macros AC_C_FLEXIBLE_ARRAY_MEMBER, AC_C_VARARRAYS.
20 ** AC_ARG_ENABLE and AC_ARG_WITH now allow '.' in feature and package names.
22 * Major changes in Autoconf 2.60b (2006-10-22)
25 Autoconf-generated shell scripts no longer export BIN_SH, due to
26 configuration hassles with this. Installers who need BIN_SH in
27 their environment should set it before invoking 'configure' and
28 'make'. As far as we know, this affects only Unixware installations.
31 The documentation now says that the following macros are obsolescent,
32 as they are superseded by Gnulib:
34 AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
36 New programs should use the Gnulib counterparts of these macros.
37 We have no current plans to remove them from Autoconf.
39 ** AC_COMPUTE_INT no longer caches or reports results.
41 ** AC_CHECK_DECL now also works with aggregate objects.
43 ** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
45 ** GNU M4 1.4.7 or later is now recommended.
48 New M4sugar macro, which is more secure than the POSIX M4 maketemp.
51 Now an alias for m4_mkstemp.
53 * Major changes in Autoconf 2.60a (2006-08-25)
55 ** GNU M4 1.4.6 or later is now recommended.
57 ** The check for C99 now tests for varargs macros, as documented.
58 It also tests that the preprocessor supports 64-bit integers.
60 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
61 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
63 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
64 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
65 two macros are different, so autoupdate will not change the old private name
66 to the new one. _AC_COMPUTE_INT may be removed in a future release.
68 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
69 that long long types be at least 64 bits wide, as C99 and tradition
70 requires. Formerly, they accepted implementations of any width.
73 * Major changes in Autoconf 2.60
75 Released 2006-06-23, by Ralf Wildenhues.
77 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
78 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
79 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
81 ** Provide a way to turn off warnings about the changed directory variables.
83 * Major changes in Autoconf 2.59d
85 Released 2006-06-05, by Ralf Wildenhues.
87 ** GNU make now recommended for VPATH builds
88 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
89 only if you use GNU make. In practice, other 'make' implementations
90 have too many subtle incompatibilities in their support for VPATH.
91 Many packages (including Autoconf itself) are portable to other
92 'make' implementations, but some packages are not, and recommending
93 GNU make keeps the installation instructions simpler.
95 ** Even more safety checks for the new Directory variables:
96 Warn about suspicious `${datarootdir}' found in config files output.
98 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
99 These never-documented macros and variables have been marked with
100 comments saying that they may be removed in a future release,
101 because their use can lead to unintended code being executed.
102 If you need functionality that only these macros or variables
103 currently supply, please write bug-autoconf@gnu.org.
105 ** AC_SUBST, AC_DEFINE
106 Literal arguments to these are passed to m4_pattern_allow now.
109 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
110 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
111 obsolete K&R tests in the Automake test suite.
120 Now more robust with special characters in file names, or when
121 multiple processes create the same directory at the same time.
123 ** Obsolescent macros
124 The documentation now says that the following macros are obsolescent:
125 they test for problems that are so old that they are no longer of
126 practical importance on current systems.
128 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
129 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
130 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
131 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
132 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
133 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
134 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
135 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
137 New programs need not use these macros. We have no current plans to
141 For compatibility with future Libtool 2.0, autoreconf will invoke
142 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
145 * Major changes in Autoconf 2.59c
147 Released 2006-04-12, by Ralf Wildenhues.
149 ** The configure command now redirects standard input from /dev/null,
150 to help avoid problems with subsidiary commands that might mistakenly
151 read standard input. AS_ORIGINAL_STDIN_FD points to the original
152 standard input before this redirection, if you really want configure to
153 read from standard input.
155 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
156 The following directory variables are new:
158 datarootdir read-only architecture-independent data root [PREFIX/share]
159 localedir locale-specific message catalogs [DATAROOTDIR/locale]
160 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
161 htmldir html documentation [DOCDIR]
162 dvidir dvi documentation [DOCDIR]
163 pdfdir pdf documentation [DOCDIR]
164 psdir ps documentation [DOCDIR]
166 The following variables have new default values:
168 datadir read-only architecture-independent data [DATAROOTDIR]
169 infodir info documentation [DATAROOTDIR/info]
170 mandir man documentation [DATAROOTDIR/man]
172 This means that if you use any of `@datadir@', `@infodir@', or
173 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
174 defined in this file. As a temporary measure, if any of those are
175 found but no mention of `datarootdir', the substitutions will be
176 replaced with values that do not contain `${datarootdir}', and a
177 warning will be issued.
179 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
180 a trailing slash. Similar change will be made to ac_top_builddir in a
181 future release; the old style value, which matches (../)*, is (and will
182 continue to be) available as ac_top_build_prefix.
185 New macro to check for support of 'typeof' syntax a la GNU C.
187 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
188 New "once-only" variants of commonly-used macros, to make 'configure'
189 smaller and faster in common cases.
192 New macro to check for strtold with C99 semantics.
195 New macro that lets builder disable assertions at 'configure'-time.
198 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
199 X11/Intrinsic.h and XtMalloc (Xt).
201 ** AC_PRESERVE_HELP_ORDER
202 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
203 and AC_ARG_WITH arguments in one region, in the order defined. The default
204 behavior is to group options of each classes separately.
206 ** AC_PROG_CC, AC_PROG_CXX
207 No longer automatically arrange to declare the 'exit' function of C,
208 when a C++ compiler is used. Standard Autoconf macros no longer use
209 'exit', so this is no longer an issue for them. If you use C++, and
210 want to call 'exit', you'll have to arrange for its declaration
211 yourself. But we now suggest you return from 'main' instead.
213 ** AC_PROG_CC_C89, AC_PROG_CC_C99
214 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
215 check for ANSI C89 and ISO C99 support respectively.
218 Has been unobsoleted, and will check if the compiler supports ISO
219 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
220 retained for backwards compatibility, assuming the value of
221 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
224 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
225 New macros for checking commonly-used members of struct dirent.
228 The substituted value can now contain newlines.
231 The substitution now occurs only when @variable@ is on a line by itself,
232 optionally surrounded by spaces and tabs. The whole line is replaced.
234 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
235 New macros to check for long double, and whether it is wider than double.
236 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
237 applications should switch to the new macro.
239 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
240 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
241 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
242 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
243 New macros to check for C99 and POSIX types.
245 ** AC_USE_SYSTEM_EXTENSIONS
246 New macro to enable extensions to Posix.
249 New macro which is defined to the name of the first declared config header
250 or undefined if no config headers have been declared yet.
253 The macro correctly handles quadrigraphs now.
255 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
256 These macros are new or published now.
259 New macro for copyright notices in testsuite files.
261 ** ALLOCA, LIBOBJS, LTLIBOBJS
262 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
263 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
264 `Makefile.in' in case the object files lie in a different directory.
265 The LIBOBJDIR feature is experimental.
268 Supports --no-recursive now.
270 ** New macros to support Erlang/OTP.
271 New macros for configuring paths to Erlang tools and libraries:
272 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
273 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
274 AC_ERLANG_SUBST_LIB_DIR.
276 New macros for configuring installation of Erlang libraries:
277 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
279 ** The manual now mentions Gnulib more prominently.
281 ** New macros to support Objective C.
282 AC_PROG_OBJC, AC_PROG_OBJCPP.
284 * Major changes in Autoconf 2.59b
286 Released 2004-08-20, by Paul Eggert.
289 New macro that computes the default alignment of a type.
291 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
292 When cross-compiling, these macros will give a warning if the tool
293 is not prefixed. In the future, unprefixed cross tools will not
294 be detected; please consult the info documentation for information
295 about the reason of this change.
297 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
298 New macros that detect programs whose name is prefixed with the
299 target type, if the build type and target type are different.
301 ** AC_REQUIRE_AUX_FILE
302 New trace macro that declares expected auxiliary files.
305 New macro that tests for a grep program that accepts as a long a line
308 ** AC_PROG_EGREP, AC_PROG_FGREP
309 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
310 FGREP="$GREP -F" respectively if possible, or else run a path search for
311 a program that accepts as long a line as possible.
314 New macro that tests for a sed program that truncates as few characters
317 * Major changes in Autoconf 2.59
319 Released 2003-11-04, by Akim Demaille
321 ** ac_abs_builddir etc.
322 Absolute file names were actually relative in 2.58.
324 * Major changes in Autoconf 2.58
326 Released 2003-11-04, by Akim Demaille
329 core.* files are no longer removed, as they may be valid user files.
331 ** autoreconf and auxiliary directory
332 Autoreconf creates the auxiliary directory if needed. This is
333 especially useful for initial "bootstrapping" of fresh CVS checkouts.
335 ** AC_CONFIG_MACRO_DIR
336 Use this macro to declare the directory for local M4 macros for aclocal.
339 No longer includes twice the same file in LIBOBJS if invoked
342 ** AC_CONFIG_COMMANDS
343 The directory for its first argument is automatically created. For
346 AC_CONFIG_COMMANDS([src/modules.hh], [...])
348 $top_builddir/src/ is created if needed.
350 ** Autotest and local.at
351 The optional file local.at is always included in Autotest test suites.
354 The warnings are always issued, including with cached runs.
355 This became a significant problem since aclocal and automake can
356 run autoconf behind the scene.
358 ** autoheader warnings
359 The warnings of autoheader can be turned off, using --warning.
360 For instance, -Wno-obsolete disables the complaints about acconfig.h
361 and other deprecated constructs.
364 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
367 ** AC_DECL_SYS_SIGLIST
371 Now checks that mktime is the inverse of localtime.
373 ** Improve DJGPP portability
374 The Autoconf tools and configure behave better under DJGPP.
376 ** Present But Cannot Be Compiled
377 New FAQ section dedicated to the mystic
379 configure: WARNING: pi.h: present but cannot be compiled
380 configure: WARNING: pi.h: check for missing prerequisite headers?
381 configure: WARNING: pi.h: proceeding with the preprocessor's result
384 ** Concurrent executions of autom4te
385 autom4te now locks its internal files, which enables concurrent
386 executions of autom4te, likely to happen if automake, autoconf,
387 autoheader etc. are run simultaneously.
390 Use of Libtool 1.5 and higher is encouraged. Compatibility with
391 Libtool pre-1.4 is not checked.
394 Testsuites no longer rerun failed tests in verbose mode; instead,
395 failures are logged while the test is run.
397 In addition, expected failures can be marked as such.
399 * Major changes in Autoconf 2.57
401 Released 2002-12-03 by Paul Eggert.
403 Bug fixes for problems with AIX linker, with freestanding C compilers,
404 with GNU M4 limitations, and with obsolete copies of GNU documents.
406 The Free Documentation License has been upgraded from 1.1 to 1.2.
408 * Major changes in Autoconf 2.56
410 Released 2002-11-15 by Akim Demaille.
412 One packaging problem fixed (config/install-sh was not executable).
414 * Major changes in Autoconf 2.55
416 Released 2002-11-14 by Akim Demaille.
420 Have your configure.ac checked by autoscan ("autoscan").
421 Try the warning options ("autoreconf -fv -Wall").
425 - AC_CHECK_HEADER, AC_CHECK_HEADERS
426 More information on proper use.
428 - Writing Test Programs
430 This sections explains how to write good test sources to use with
431 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
433 - AC_FOO_IFELSE vs. AC_TRY_FOO
435 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
436 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
440 - Is more robust to different Gettext installations.
442 - Produces messages (when --verbose) to be understood by Emacs'
445 - Supports -W/--warnings.
448 Once the GNU Build System reinstalled, run `./config.status
449 --recheck && ./config.status && make' if possible.
453 - Supports --cache, and --no-cache.
455 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
456 (autom4te.cache). See `Customizing autom4te' in the documentation.
463 Support for the obsoleted options -m, --macrodir, -l, --localdir is
464 dropped in favor of the safer --include/--prepend-include scheme.
469 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
470 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
471 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
474 Obsoleted macros are kept for Autoconf backward compatibility, but
475 should be avoided in configure.ac. Running autoupdate is advised.
478 - AC_DEFINE/AC_DEFINE_UNQUOTED
480 We have to stop using the old compatibility scheme --that tried to
481 avoid useless backslashes-- because Libtool 1.4.3 contains a
483 AC_DEFINE([error_t], [int],
484 [Define to a type to use for \`error_t' if it is not
485 otherwise available.])
487 We have to quote the single quotes and backslashes with \. The old
488 compatibility scheme saw that ` was backslashed, and therefore did
489 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
490 compatible with Libtool. Autoconf 2.55 is, but in some cases might
491 produce more \ than wanted.
493 Please, note that in the future the same problem will happen with
494 AC_MSG_*: use `autoreconf -f -Wall'.
498 - Portability of the Autoconf package to Solaris.
500 - Spurious warnings caused by config.status.
501 This bug is benign, but painful: on some systems (typically
502 FreeBSD), warnings such as:
504 config.status: creating Makefile
505 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
507 could be issued. This is fixed.
510 Simultaneous executions of config.status are possible again.
512 - Precious variables accumulation
514 config.status could stack several copies of the precious variables
518 ** Plans for later versions
522 The compatibility hooks with the old scheme will be completely
523 removed. Please, advice/use `--build', `--host', and `--target'
526 - AC_CHECK_HEADER, AC_CHECK_HEADERS
528 The tests will be stricter, please make sure your invocations are
533 Shell functions will gradually be introduced, probably starting with
534 Autotest. If you know machines which are in use that you suspect
535 *not* to support shell functions, please run the test suite of
536 Autoconf 2.55 on it, and report the results to
537 bug-autoconf@gnu.org.
541 Special characters in AC_MSG_* need not be quoted. Currently,
542 Autoconf has heuristics to decide when a string is escaped, or has
543 to be escaped. This scheme is fragile, and will be removed; the
544 only risk is uglified messages. Please, run `autoreconf -f -Wall'
545 to find occurrences that will be affected.
547 * Major changes in Autoconf 2.54
549 Released 2002-09-13 by Akim Demaille.
553 - autoreconf no longer changes the version of the gettext/po/intl
554 support files. It now adds the files the correspond to the
555 AM_GNU_GETTEXT_VERSION declared in configure.ac.
557 Warning: It now relies on the 'autopoint' program, which is part
558 of GNU gettext 0.11.4 and newer.
560 Please note that you need to have a GNU gettext version that
561 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
562 in configure.ac. You can upgrade to newer GNU gettext versions,
563 though, without needing to change configure.ac.
565 - The -I DIR or --include=DIR option now appends DIR to the include path
566 instead of prepending; this is for consistency with other GNU tools.
567 The new -B DIR or --prepend-include=DIR option has the old behavior.
572 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
573 Please, remove lines such as
575 # This is necessary so that .o files in LIBOBJS are also
576 # built via the ANSI2KNR-filtering rules.
577 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
579 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
580 your Makefiles either.
582 - AC_CONFIG_LINKS now makes copies if it can't make links.
584 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
585 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
586 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
588 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
590 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
592 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
596 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
597 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
598 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
601 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
604 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
605 for an AC_LIBOBJ replacement.
609 - Spurious complaints from `m4_bmatch' about invalid regular
610 expressions are suppressed.
612 - Empty top_builddirs are properly handled.
614 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
617 Now colon in the optional path arguments are properly handled.
619 ** Improved portability
621 - Both Autoconf the package, and the scripts it produces, should run
622 more reliably with Zsh. Bear in mind it is the default Bourne shell
625 - Autoconf and the scripts it produces no longer assume the existence of
626 the obsolescent commands egrep and fgrep.
630 - Limitations of Make
634 The GNATS base moved to
635 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
636 (It is no longer available, though.)
641 Now contains the list of ouput variables and files (AC_SUBST,
644 * Major changes in Autoconf 2.53
646 Released 2002-03-08 by Akim Demaille.
650 Perl 5.005_03 or later is required: autom4te is written in Perl and is
651 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
657 Argument requirements, output variables, defined macros.
658 - M4sugar, M4sh, Autotest
660 - Double quoting macros
661 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
663 The Autoconf manual is now distributed under the terms of the GNU FDL.
664 - Section `Hosts and Cross-Compilation'
665 Explains the rationale for the 2.5x changes in the cross-compilation
666 chain, and in the relationships between build, host, and target
668 Emphasizes that `cross-compilation' == `--host is given'.
669 If you are working on compilers etc., be sure to read this section.
670 - Section `AC_LIBOBJ vs. LIBOBJS'
671 Explains why assigning LIBOBJS directly is now an error.
672 Details how to update the code.
677 Now used instead of hard coded line numbers.
678 This eases the comparison of `configure's, and diminishes the
679 pressure over control version archives.
680 Automatic replacement for shells that don't support this feature.
681 - New output variables
682 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
687 Autoconf and Autotest modes are provided.
692 New, used by the Autoconf suite to cache and speed up most processing.
694 Supported by autom4te, autoconf and autoheader.
696 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
697 autoupdate, and autoreconf.
699 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
700 automake options are to be given via AUTOMAKE_OPTIONS.
702 Runs gettextize and libtoolize when appropriate.
704 --m4dir is no longer supported.
706 Now runs only in the specified directories, defaulting to `.',
707 but understands AC_CONFIG_SUBDIRS for dependent directories.
708 Before, it used to run on all the `configure.ac' found in the
710 Independent packages are properly updated.
714 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
716 Under the user pressure, $? is finally available. Probably a mistake.
717 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
718 - Precious variables accumulation
719 config.status could stack several copies of the precious variables
721 - AC_PATH_PROG and family.
722 Works properly when given a literal path.
724 Somewhere since 2.13, the result had been reversed.
728 - AC_C_BIGENDIAN supports the cross-compiling case.
729 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
730 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
731 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
733 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
734 precision than `double'.
739 It now defines the preprocessor symbols PACKAGE_NAME,
740 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
744 Admits a fourth optional parameter: the tar name.
746 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
747 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
748 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
751 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
752 Are much less expensive when using long lists of files.
755 Works with shell variables, and non alphanumeric names.
759 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
760 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
762 - AC_FUNC_STRTOD substitutes POW_LIB.
767 * Major changes in Autoconf 2.52
769 Released 2001-07-18 by Akim Demaille.
774 This feature was present in autoconf 2.50 but was not documented.
775 For example, `@<:@' is translated to `[' just before output. This
776 is useful when writing strings that contain unbalanced quotes, or
777 other hard-to-quote constructs.
778 - m4_pattern_forbid, m4_pattern_allow
779 - Tips for upgrading from 2.13.
780 - Using autoscan to maintain a configure.ac.
783 - Now include stdint.h.
784 - sys/types.h and sys/stat.h are guarded.
785 - strings.h is included if available, and not conflicting with string.h.
788 - The test suite is more robust and presents less false failures.
789 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
790 - configure accepts --prefix='' again.
791 - AC_CHECK_LIB works properly when its first argument is not a
793 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
794 - build_, host_, and target_alias are AC_SUBST as in 2.13.
795 - AC_ARG_VAR properly propagates precious variables inherited from the
796 environment to ./config.status.
797 - Using --program-suffix/--program-prefix is portable.
798 - Failures to detect the default compiler's output extension are less
800 - `config.status foo' works properly when `foo' depends on variables
801 set in an AC_CONFIG_THING INIT-CMD.
802 - autoheader is more robust to broken input.
803 - Fixed Fortran name-mangling and link tests on a number of systems,
804 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
807 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
808 specify pre-includes. In this case, the headers are compiled with
809 cc, not merely preprocessed by cpp. Therefore it is the _usability_
810 of a header which is checked for, not just its availability.
811 - AC_ARG_VAR refuses to run configure when precious variables have
813 - Versions of compilers are dumped in the logs.
814 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
817 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
818 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
819 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
820 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
821 Be sure to read `Upgrading from Version 2.13' to understand why
822 running `autoupdate' is needed.
823 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
824 a main-like routine is required/possible when linking C/C++ with
825 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
826 - AC_FUNC_GETPGRG behaves better when cross-compiling.
828 * Major changes in Autoconf 2.51
829 There was no release of Autoconf 2.51 since some packagers had used
830 this version number without permission to ship intermediary versions
831 of 2.50. The version was skipped to avoid confusion.
833 * Major changes in Autoconf 2.50
835 Released 2001-05-21 by Akim Demaille.
838 There have been far too many to enumerate them here. Check out
839 ChangeLog if you really want to know more.
841 ** Improved documentation
842 In particular, portability issues are better covered.
845 All the standard GNU Makefile targets are supported. The layout has
846 changed: m4/ holds the M4 extensions Autoconf needs for its
847 configuration, doc/ contains the documentation, and tests/ contains
850 ** Man pages are provided
851 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
852 config.guess, config.sub.
856 Provides a safe and powerful means to trace the macro uses. This
857 provide the parsing layer for tools which need to `study'
861 Specify what category of warnings should be enabled.
863 - When recursing into subdirectories, try for configure.gnu before
864 configure to adapt for packages not using autoconf on case-insensitive
868 More errors are now caught (circular AC_REQUIRE dependencies,
869 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
870 etc.). In addition, their location and call stack are given.
873 autoupdate is much more powerful, and is able to provide the glue code
874 which might be needed to move from an old macro to its newer
877 You are strongly encouraged to use it to modernize both your
878 `configure.in' and your .m4 extension files.
881 The internal machinery of autoheader has completely changed. As a
882 result, using `acconfig.h' should be considered to be obsoleted, and
883 you are encouraged to get rid of it using the AH macros.
888 ** Fortran 77 compilers
889 Globally, the support for Fortran 77 is considerably improved.
891 Support for automatically determining a Fortran 77 compiler's
892 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
893 provided to wrap C/C++ identifiers, thus making it easier and more
894 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
895 call C/C++ routines. See the Texinfo documentation for details.
898 The test suite no longer uses DejaGNU. It should be easy to submit
899 test cases in this new framework.
902 - --help, --help=long, -hl
903 no longer dumps useless items.
905 lists only specific options.
906 - --help=recursive, -hr
907 displays the help of all the embedded packages.
908 - Remembers environment variables when reconfiguring.
909 The previous scheme to set envvar before running configure was
911 what prevented configure from remembering the environment in which
912 it was run, therefore --recheck was run in an inconsistent
913 environment. Now, one should run
915 and then --recheck will work properly. Variables declared with
916 AC_ARG_VAR are also preserved.
918 $build defaults to `config.guess`, $host to $build, and then $target
920 Cross-compilation is a global status of the package, it no longer
921 depends upon the current language.
922 Cross compilation is enabled iff the user specified `--host'.
923 `configure' now fails if it can't run the executables it compiles,
924 unless cross-compilation is enabled.
926 The cache file is disabled by default. The new options
927 `--config-cache', `-C' set the cache to `config.cache'.
931 Much faster on most architectures.
932 - concurrent executions
933 It is safe to use `make -j' with config.status.
934 - human interface improved
935 It is possible to invoke
936 ./config.status foobar
937 instead of the former form (still valid)
938 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
939 CONFIG_FILES=foobar:foo.in:bar.in \
941 The same holds for configuration headers and links.
942 You can instantiate unknown files and headers:
943 ./config.status --header foo.h:foo.h.in --file bar:baz
944 - has a useful --help
945 - accepts special file name "-" for stdin/stdout
950 Specify additional copyright information.
953 Now expects the identity of the package as argument.
957 Most macros, if not all, now strictly follow the `one quotation
958 level' rule. This results in a more predictable expansion.
961 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
962 configure scripts, was fixed by Axel Thimm.
966 Document and ask for the registration of an envvar.
969 Specifies the file which `configure' should look for when trying to
970 find the source tree (used to be handled by AC_INIT).
973 To add new actions to config.status. Should be used instead of
977 Replaces AC_LINK_FILES.
979 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
980 AC_CONFIG_LINKS, and AC_CONFIG_FILES
981 They now obey sh: you should no longer use shell variables as
984 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
985 AC_CONFIG_SUBDIRS($my_subdirs)
989 if test "$package_foo_enabled" = yes; then
990 AC_CONFIG_SUBDIRS(foo)
994 To format an Autoconf macro's help string so that it looks pretty
995 when the user executes `configure --help'.
998 ** Generic Test Macros
1000 The interface of the AC_CHECK families of macros (decl, header,
1001 type, member, func) is now uniform. They support the same set of
1004 - AC_CHECK_DECL, AC_CHECK_DECLS
1005 To check whether a symbol is declared.
1007 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
1008 No longer need a cross-compilation default.
1011 The test it performs is much more robust than previously, and makes
1012 it possible to test builtin types in addition to typedefs.
1013 It is now schizophrenic:
1014 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
1015 remains for backward compatibility, but its use is discouraged.
1016 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
1017 behaves exactly like the other AC_CHECK macros.
1020 Checks whether given types are supported by the system.
1022 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
1023 Check for given members in aggregates (e.g., pw_gecos in struct
1027 Checks if the compiler supports ISO C, included when needs special
1031 Checking whether the preprocessor indicates missing includes by the
1032 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1035 Takes a language as argument and replaces AC_LANG_C,
1036 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1038 - AC_LANG_PUSH, AC_LANG_POP
1039 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1042 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1043 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1044 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1048 Sets GETGROUPS_LIBS.
1050 - AC_FUNC_GETLOADAVG
1051 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1054 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1057 Arrange for large-file support.
1059 - AC_EXEEXT, AC_OBJEXT
1060 You are no longer expected to use them: their computation is
1061 performed by default.
1063 ** C++ compatibility
1064 Every macro has been revisited in order to support at best CC=c++.
1066 Major changes in Autoconf 2.14:
1067 There was no release of GNU Autoconf 2.14.
1069 Major changes in Autoconf 2.13:
1071 Released 1999-05-01 by Ben Elliston.
1073 * Support for building on Win32 systems where the only available C or
1074 C++ compiler is the Microsoft Visual C++ command line compiler
1075 (`cl'). Additional support for building on Win32 systems which are
1076 using the Cygwin or Mingw32 environments.
1077 * Support for alternative object file and executable file extensions.
1078 On Win32, for example, these are .obj and .exe. These are discovered
1079 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1080 @EXEEXT@ in the output, respectively.
1081 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1082 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1083 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1084 * AC_DEFINE now has an optional third argument for a description to be
1085 placed in the config header input file (e.g. config.h.in).
1086 * The C++ code fragment compiled for the C++ compiler test had to be
1087 improved to include an explicit return type for main(). This was
1088 causing failures on systems using recent versions of the EGCS C++
1090 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1091 script to report that `sometype_t' was present when only `type_t'
1093 * Merge of the FSF version of config.guess and config.sub to modernize
1094 these scripts. Add support for a few new hosts in config.guess.
1095 Incorporate latest versions of install-sh, mkinstalldirs and
1096 texinfo.tex from the FSF.
1097 * autoreconf is capable of running automake if necessary (and
1099 * Support for Fortran 77. See the Texinfo documentation for details.
1100 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1102 Major changes in Autoconf 2.12:
1104 Released 1996-11-26 by David J. MacKenzie
1106 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1107 concatenating multiple input files separated by colons, like so:
1108 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1109 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1110 The arguments may be shell variables, to compute the lists on the fly.
1111 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1112 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1115 Major changes in Autoconf 2.11:
1117 Released November 18th, 1996, by David J. MacKenzie
1119 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1120 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1121 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1122 * AC_CONFIG_HEADER expands shell variables in its argument.
1123 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1124 * The "checking..." messages and the source code for test programs that
1125 fail are saved in config.log.
1126 * Another workaround has been added for seds with small command length limits.
1127 * config.sub and config.guess recognize more system types.
1130 Major changes in Autoconf 2.10:
1132 Released May 7th, 1996, by Roland McGrath
1135 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1136 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1138 Major changes in Autoconf 2.9:
1140 Released March 16th, 1996, by Roland McGrath
1144 Major changes in Autoconf 2.8:
1146 Released March 8th, 1996, by Roland McGrath
1150 Major changes in Autoconf 2.7:
1152 Released November 22nd, 1995, by David J. MacKenzie
1156 Major changes in Autoconf 2.6:
1158 Released November 20th, 1995, by David J. MacKenzie
1162 Major changes in Autoconf 2.5:
1164 Released November 17th, 1995, by Roland McGrath
1166 * New configure options --bindir, --libdir, --datadir, etc., with
1167 corresponding output variables.
1168 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1169 * config.log contains the command being run as well as any output from it.
1170 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1171 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1172 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1173 AC_CHECK_TOOL can search a path other than $PATH.
1174 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1176 Major changes in Autoconf 2.4:
1178 Released June 14th, 1995, by David J. MacKenzie
1180 * Fix a few bugs found by Emacs testers.
1182 Major changes in Autoconf 2.3:
1184 Released March 27th, 1995, by David J. MacKenzie
1186 * Fix the cleanup trap in several ways.
1187 * Handle C compilers that are picky about option placement.
1188 * ifnames gets the version number from the right directory.
1190 Major changes in Autoconf 2.2:
1192 Released March 8th, 1995, by David J. MacKenzie
1194 * The ifnames utility is much faster but requires a "new awk" interpreter.
1195 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1196 library before existing libs, not after, in case it uses them.
1197 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1198 * Lots of bug fixes.
1199 * Many additions to the TODO file :-)
1201 Major changes in Autoconf 2.1:
1203 Released November 4th, 1994, by David J. MacKenzie
1206 * More explanations in the manual.
1207 * Fix a spurious failure in the testsuite.
1208 * Clarify some warning messages.
1209 * autoreconf by default only rebuilds configure and config.h.in files
1210 that are older than any of their particular input files; there is a
1211 --force option to use after installing a new version of Autoconf.
1213 Thanks to everybody who's submitted changes and additions to Autoconf!
1214 I've incorporated many of them, and am still considering others for
1215 future releases -- but I didn't want to postpone this release indefinitely.
1217 Caution: don't indiscriminately rebuild configure scripts with
1218 Autoconf version 2. Some configure.in files need minor adjustments to
1219 work with it; the documentation has a chapter on upgrading. A few
1220 configure.in files, including those for GNU Emacs and the GNU C
1221 Library, need major changes because they relied on undocumented
1222 internals of version 1. Future releases of those packages will have
1223 updated configure.in files.
1225 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1226 Autoconf now makes heavy use of M4 diversions, which were implemented
1227 inefficiently in GNU M4 releases before 1.3.
1229 Major changes in Autoconf 2.0:
1231 Released October 26th, 1994, by David J. MacKenzie
1233 ** New copyright terms:
1234 * There are no restrictions on distribution or use of configure scripts.
1237 * Autoconf manual is reorganized to make information easier to find
1238 and has several new indexes.
1239 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1242 * autoscan to generate a preliminary configure.in for a package by
1243 scanning its source code for commonly used nonportable functions,
1244 programs, and header files.
1245 * ifnames to list the symbols used in #if and #ifdef directives in a
1247 * autoupdate to update a configure.in to use the version 2 macro names.
1248 * autoreconf to recursively remake configure and configuration header
1249 files in a source tree.
1251 ** Changed utilities:
1252 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1253 * autoconf and autoheader can look for package-local definition files
1254 in an alternate directory.
1257 * AC_CACHE_VAL to share results of tests between configure runs.
1258 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1259 that macros invoked with AC_REQUIRE don't interrupt other macros.
1260 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1261 support deciding unguessable features based on the host and target types.
1262 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1263 * AC_ARG_PROGRAM to use the options --program-prefix,
1264 --program-suffix, and --program-transform-name to change the names
1265 of programs being installed.
1266 * AC_PREFIX_DEFAULT to change the default installation prefix.
1267 * AC_TRY_COMPILE to compile a test program without linking it.
1268 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1269 * AC_CHECK_LIB to check for a particular function and library.
1270 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1271 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1272 * AC_SUBST_FILE to insert one file into another.
1273 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1274 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1275 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1276 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1279 * Many macros renamed systematically, but old names are accepted for
1280 backward compatibility.
1281 * AC_OUTPUT adds the "automatically generated" comment to
1282 non-Makefiles where it finds @configure_input@ in an input file, to
1283 support files with various comment syntaxes.
1284 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1285 files when they are not enclosed in @ signs.
1286 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1287 override the file name "config.status".
1288 * AC_OUTPUT takes an optional argument for passing variables from
1289 configure to config.status.
1290 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1291 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1292 CPPFLAGS, and LDFLAGS from the environment.
1293 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1294 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1295 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1296 srcdir/../.. by default.
1297 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1298 * AC_DEFINE no longer prints anything, because of the new result reporting
1299 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1300 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1301 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1302 --enable- and --with- options.
1303 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1304 execute on success or failure.
1305 * Checking for C functions in C++ works.
1308 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1309 better maintained with them.
1310 * AC_ARG_ARRAY removed because no one was likely using it.
1311 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1312 take arguments, for consistency with all of the other specific checks.
1315 * Comes with config.sub and config.guess, and uses them optionally.
1316 * Uses config.cache to cache test results. An alternate cache file
1317 can be selected with the --cache-file=FILE option.
1318 * Uses optional shell scripts $prefix/share/config.site and
1319 $prefix/etc/config.site to perform site or system specific initializations.
1320 * configure saves compiler output to ./config.log for debugging.
1321 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1322 * acsite.m4 is the new name for the system-wide aclocal.m4.
1323 * Has a DejaGnu test suite.
1325 Major changes in Autoconf 1.11:
1327 * AC_PROG_INSTALL calls install.sh with the -c option.
1328 * AC_SET_MAKE cleans up after itself.
1329 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1330 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1332 Plus a few other bug fixes.
1334 Major changes in Autoconf 1.10:
1336 * autoheader uses config.h.bot if present, analogous to config.h.top.
1337 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1339 * AC_PROG_CXX looks for cxx as a C++ compiler.
1341 Plus several bugs fixed.
1343 Major changes in Autoconf 1.9:
1345 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1346 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1347 and autoheader generates entries for those names automatically.
1348 * AC_FIND_X gets the result from xmkmf correctly.
1349 * AC_FIND_X assumes no X if --without-x was given.
1350 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1351 * AC_PROG_INSTALL finds OSF/1 installbsd.
1353 Major changes in Autoconf 1.8:
1356 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1357 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1358 for checking both C++ and C features in one configure script.
1359 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1360 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1361 AC_SET_MAKE, AC_ENABLE.
1364 * AC_FIND_X looks for X in more places.
1365 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1366 install.sh is distributed with Autoconf.
1367 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1368 a rewrite of quoting in AC_DEFINE.
1369 * AC_OUTPUT adds its comments in C format when substituting in C files.
1370 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1372 ** New or changed command line options:
1373 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1374 * configure accepts --without-PACKAGE, which sets withval=no.
1375 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1376 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1377 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1378 * configure accepts and ignores most other Cygnus configure options, and
1379 warns about unknown options.
1380 * config.status accepts --help, --version options.
1382 ** File names and other changes:
1383 * Relative srcdir values are not made absolute.
1384 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1385 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1386 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1387 * The example Makefile dependencies for configure et al. work better.
1388 * Namespace cleanup: all shell variables used internally by Autoconf
1389 have names beginning with `ac_'.
1391 More big improvements are in process for future releases, but have not
1392 yet been (variously) finished, integrated, tested, or documented enough
1395 Major changes in Autoconf 1.7:
1397 * New macro AC_OBSOLETE.
1398 * Bugs in Makefile.in fixed.
1399 * AC_LONG_FILE_NAMES improved.
1401 Major changes in Autoconf 1.6:
1403 * New macro AC_LONG_64_BITS.
1404 * Multiple .h files can be created.
1405 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1406 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1407 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1408 * Unused --no-create option to configure removed.
1409 * autoheader doesn't change the timestamp of its output file if
1410 the file didn't change.
1411 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1412 * config.status checks three optional environment variables to
1413 modify its behavior.
1414 * The usual bug fixes.
1416 Major changes in Autoconf 1.5:
1418 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1419 * autoconf and autoheader scripts have GNU standards conforming
1420 --version and --help options (they print their message and exit).
1423 Major changes in Autoconf 1.4:
1425 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1426 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1427 * autoconf and autoheader use the M4 environment variable to determine the
1428 name of the M4 program to use.
1429 * The --macrodir option to autoconf and autoheader specifies the directory
1430 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1431 * autoconf and autoheader can take `-' as their file names, which means to
1432 read stdin as input.
1433 * Resulting configure scripts can take a --verbose option which causes them
1434 to print the results of their tests.
1435 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1436 shell characters, etc. will be preserved during various stages of
1437 expansion done by the shell. If you don't want this, use
1438 AC_DEFINE_UNQUOTED instead.
1439 * Much textual processing done with external calls to tr and sed have been
1440 internalized with builtin M4 `patsubst' and `translit' calls.
1441 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1442 set the shell variables `gen_files' and `gen_config' to the list of
1443 file names to output.
1444 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1445 "lex.yy" or "lexyy", depending on the system.
1446 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1448 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1449 * AC_CONST works much more reliably on more systems.
1452 Major changes in Autoconf 1.3:
1454 configure no longer requires awk for packages that use a config.h.
1455 Support handling --with-PACKAGE options.
1456 New `autoheader' script to create `config.h.in' from `configure.in'.
1457 Ignore troublesome -lucb and -lPW when searching for alloca.
1458 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1459 Improve detection of STDC library.
1460 Add AC_HAVE_LIBRARY to check for non-default libraries.
1461 Function checking should work with future GNU libc releases.
1463 Major changes in Autoconf 1.2:
1465 The --srcdir option is now usually unnecessary.
1466 Add a file containing sample comments describing CPP macros.
1467 A comment in config.status tells which host it was configured on.
1468 Substituted variable values can now contain commas.
1469 Fix bugs in various feature checks.
1471 Major changes in Autoconf 1.1:
1473 Added AC_STRCOLL macro.
1474 Made AC_GETLOADAVG check for more things.
1475 AC_OUTPUT argument is now optional.
1480 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1481 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1483 This file is part of GNU Autoconf.
1485 GNU Autoconf is free software; you can redistribute it and/or modify
1486 it under the terms of the GNU General Public License as published by
1487 the Free Software Foundation; either version 2, or (at your option)
1490 GNU Autoconf is distributed in the hope that it will be useful,
1491 but WITHOUT ANY WARRANTY; without even the implied warranty of
1492 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1493 GNU General Public License for more details.
1495 You should have received a copy of the GNU General Public License
1496 along with GNU Autoconf; see the file COPYING. If not, write to
1497 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
1498 Boston, MA 02110-1301, USA.