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11 as they are superseded by Gnulib: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 No longer caches or reports results.
21 ** AC_CHECK_DECL now also works with aggregate objects.
23 ** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
25 ** GNU M4 1.4.7 or later is now recommended.
28 New M4sugar macro, which is more secure than the POSIX M4 maketemp.
31 Now an alias for m4_mkstemp.
33 * Major changes in Autoconf 2.60a (2006-08-25)
35 ** GNU M4 1.4.6 or later is now recommended. At least one "make check"
36 test fails with earlier versions of M4.
38 ** The check for C99 now tests for varargs macros, as documented.
39 It also tests that the preprocessor supports 64-bit integers.
41 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
42 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
44 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
45 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
46 two macros are different, so autoupdate will not change the old private name
47 to the new one. _AC_COMPUTE_INT may be removed in a future release.
49 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
50 that long long types be at least 64 bits wide, as C99 and tradition
51 requires. Formerly, they accepted implementations of any width.
54 * Major changes in Autoconf 2.60
56 Released 2006-06-23, by Ralf Wildenhues.
58 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
59 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
60 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
62 ** Provide a way to turn off warnings about the changed directory variables.
64 * Major changes in Autoconf 2.59d
66 Released 2006-06-05, by Ralf Wildenhues.
68 ** GNU make now recommended for VPATH builds
69 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
70 only if you use GNU make. In practice, other 'make' implementations
71 have too many subtle incompatibilities in their support for VPATH.
72 Many packages (including Autoconf itself) are portable to other
73 'make' implementations, but some packages are not, and recommending
74 GNU make keeps the installation instructions simpler.
76 ** Even more safety checks for the new Directory variables:
77 Warn about suspicious `${datarootdir}' found in config files output.
79 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
80 These never-documented macros and variables have been marked with
81 comments saying that they may be removed in a future release,
82 because their use can lead to unintended code being executed.
83 If you need functionality that only these macros or variables
84 currently supply, please write bug-autoconf@gnu.org.
86 ** AC_SUBST, AC_DEFINE
87 Literal arguments to these are passed to m4_pattern_allow now.
90 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
91 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
92 obsolete K&R tests in the Automake test suite.
101 Now more robust with special characters in file names, or when
102 multiple processes create the same directory at the same time.
104 ** Obsolescent macros
105 The documentation now says that the following macros are obsolescent:
106 they test for problems that are so old that they are no longer of
107 practical importance on current systems.
109 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
110 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
111 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
112 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
113 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
114 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
115 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
116 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
118 New programs need not use these macros. We have no current plans to
122 For compatibility with future Libtool 2.0, autoreconf will invoke
123 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
126 * Major changes in Autoconf 2.59c
128 Released 2006-04-12, by Ralf Wildenhues.
130 ** The configure command now redirects standard input from /dev/null,
131 to help avoid problems with subsidiary commands that might mistakenly
132 read standard input. AS_ORIGINAL_STDIN_FD points to the original
133 standard input before this redirection, if you really want configure to
134 read from standard input.
136 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
137 The following directory variables are new:
139 datarootdir read-only architecture-independent data root [PREFIX/share]
140 localedir locale-specific message catalogs [DATAROOTDIR/locale]
141 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
142 htmldir html documentation [DOCDIR]
143 dvidir dvi documentation [DOCDIR]
144 pdfdir pdf documentation [DOCDIR]
145 psdir ps documentation [DOCDIR]
147 The following variables have new default values:
149 datadir read-only architecture-independent data [DATAROOTDIR]
150 infodir info documentation [DATAROOTDIR/info]
151 mandir man documentation [DATAROOTDIR/man]
153 This means that if you use any of `@datadir@', `@infodir@', or
154 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
155 defined in this file. As a temporary measure, if any of those are
156 found but no mention of `datarootdir', the substitutions will be
157 replaced with values that do not contain `${datarootdir}', and a
158 warning will be issued.
160 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
161 a trailing slash. Similar change will be made to ac_top_builddir in a
162 future release; the old style value, which matches (../)*, is (and will
163 continue to be) available as ac_top_build_prefix.
166 New macro to check for support of 'typeof' syntax a la GNU C.
168 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
169 New "once-only" variants of commonly-used macros, to make 'configure'
170 smaller and faster in common cases.
173 New macro to check for strtold with C99 semantics.
176 New macro that lets builder disable assertions at 'configure'-time.
179 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
180 X11/Intrinsic.h and XtMalloc (Xt).
182 ** AC_PRESERVE_HELP_ORDER
183 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
184 and AC_ARG_WITH arguments in one region, in the order defined. The default
185 behavior is to group options of each classes separately.
187 ** AC_PROG_CC, AC_PROG_CXX
188 No longer automatically arrange to declare the 'exit' function of C,
189 when a C++ compiler is used. Standard Autoconf macros no longer use
190 'exit', so this is no longer an issue for them. If you use C++, and
191 want to call 'exit', you'll have to arrange for its declaration
192 yourself. But we now suggest you return from 'main' instead.
194 ** AC_PROG_CC_C89, AC_PROG_CC_C99
195 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
196 check for ANSI C89 and ISO C99 support respectively.
199 Has been unobsoleted, and will check if the compiler supports ISO
200 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
201 retained for backwards compatibility, assuming the value of
202 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
205 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
206 New macros for checking commonly-used members of struct dirent.
209 The substituted value can now contain newlines.
212 The substitution now occurs only when @variable@ is on a line by itself,
213 optionally surrounded by spaces and tabs. The whole line is replaced.
215 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
216 New macros to check for long double, and whether it is wider than double.
217 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
218 applications should switch to the new macro.
220 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
221 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
222 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
223 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
224 New macros to check for C99 and POSIX types.
226 ** AC_USE_SYSTEM_EXTENSIONS
227 New macro to enable extensions to Posix.
230 New macro which is defined to the name of the first declared config header
231 or undefined if no config headers have been declared yet.
234 The macro correctly handles quadrigraphs now.
236 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
237 These macros are new or published now.
240 New macro for copyright notices in testsuite files.
242 ** ALLOCA, LIBOBJS, LTLIBOBJS
243 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
244 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
245 `Makefile.in' in case the object files lie in a different directory.
246 The LIBOBJDIR feature is experimental.
249 Supports --no-recursive now.
251 ** New macros to support Erlang/OTP.
252 New macros for configuring paths to Erlang tools and libraries:
253 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
254 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
255 AC_ERLANG_SUBST_LIB_DIR.
257 New macros for configuring installation of Erlang libraries:
258 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
260 ** The manual now mentions Gnulib more prominently.
262 ** New macros to support Objective C.
263 AC_PROG_OBJC, AC_PROG_OBJCPP.
265 * Major changes in Autoconf 2.59b
267 Released 2004-08-20, by Paul Eggert.
270 New macro that computes the default alignment of a type.
272 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
273 When cross-compiling, these macros will give a warning if the tool
274 is not prefixed. In the future, unprefixed cross tools will not
275 be detected; please consult the info documentation for information
276 about the reason of this change.
278 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
279 New macros that detect programs whose name is prefixed with the
280 target type, if the build type and target type are different.
282 ** AC_REQUIRE_AUX_FILE
283 New trace macro that declares expected auxiliary files.
286 New macro that tests for a grep program that accepts as a long a line
289 ** AC_PROG_EGREP, AC_PROG_FGREP
290 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
291 FGREP="$GREP -F" respectively if possible, or else run a path search for
292 a program that accepts as long a line as possible.
295 New macro that tests for a sed program that truncates as few characters
298 * Major changes in Autoconf 2.59
300 Released 2003-11-04, by Akim Demaille
302 ** ac_abs_builddir etc.
303 Absolute file names were actually relative in 2.58.
305 * Major changes in Autoconf 2.58
307 Released 2003-11-04, by Akim Demaille
310 core.* files are no longer removed, as they may be valid user files.
312 ** autoreconf and auxiliary directory
313 Autoreconf creates the auxiliary directory if needed. This is
314 especially useful for initial "bootstrapping" of fresh CVS checkouts.
316 ** AC_CONFIG_MACRO_DIR
317 Use this macro to declare the directory for local M4 macros for aclocal.
320 No longer includes twice the same file in LIBOBJS if invoked
323 ** AC_CONFIG_COMMANDS
324 The directory for its first argument is automatically created. For
327 AC_CONFIG_COMMANDS([src/modules.hh], [...])
329 $top_builddir/src/ is created if needed.
331 ** Autotest and local.at
332 The optional file local.at is always included in Autotest test suites.
335 The warnings are always issued, including with cached runs.
336 This became a significant problem since aclocal and automake can
337 run autoconf behind the scene.
339 ** autoheader warnings
340 The warnings of autoheader can be turned off, using --warning.
341 For instance, -Wno-obsolete disables the complaints about acconfig.h
342 and other deprecated constructs.
345 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
348 ** AC_DECL_SYS_SIGLIST
352 Now checks that mktime is the inverse of localtime.
354 ** Improve DJGPP portability
355 The Autoconf tools and configure behave better under DJGPP.
357 ** Present But Cannot Be Compiled
358 New FAQ section dedicated to the mystic
360 configure: WARNING: pi.h: present but cannot be compiled
361 configure: WARNING: pi.h: check for missing prerequisite headers?
362 configure: WARNING: pi.h: proceeding with the preprocessor's result
365 ** Concurrent executions of autom4te
366 autom4te now locks its internal files, which enables concurrent
367 executions of autom4te, likely to happen if automake, autoconf,
368 autoheader etc. are run simultaneously.
371 Use of Libtool 1.5 and higher is encouraged. Compatibility with
372 Libtool pre-1.4 is not checked.
375 Testsuites no longer rerun failed tests in verbose mode; instead,
376 failures are logged while the test is run.
378 In addition, expected failures can be marked as such.
380 * Major changes in Autoconf 2.57
382 Released 2002-12-03 by Paul Eggert.
384 Bug fixes for problems with AIX linker, with freestanding C compilers,
385 with GNU M4 limitations, and with obsolete copies of GNU documents.
387 The Free Documentation License has been upgraded from 1.1 to 1.2.
389 * Major changes in Autoconf 2.56
391 Released 2002-11-15 by Akim Demaille.
393 One packaging problem fixed (config/install-sh was not executable).
395 * Major changes in Autoconf 2.55
397 Released 2002-11-14 by Akim Demaille.
401 Have your configure.ac checked by autoscan ("autoscan").
402 Try the warning options ("autoreconf -fv -Wall").
406 - AC_CHECK_HEADER, AC_CHECK_HEADERS
407 More information on proper use.
409 - Writing Test Programs
411 This sections explains how to write good test sources to use with
412 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
414 - AC_FOO_IFELSE vs. AC_TRY_FOO
416 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
417 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
421 - Is more robust to different Gettext installations.
423 - Produces messages (when --verbose) to be understood by Emacs'
426 - Supports -W/--warnings.
429 Once the GNU Build System reinstalled, run `./config.status
430 --recheck && ./config.status && make' if possible.
434 - Supports --cache, and --no-cache.
436 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
437 (autom4te.cache). See `Customizing autom4te' in the documentation.
444 Support for the obsoleted options -m, --macrodir, -l, --localdir is
445 dropped in favor of the safer --include/--prepend-include scheme.
450 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
451 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
452 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
455 Obsoleted macros are kept for Autoconf backward compatibility, but
456 should be avoided in configure.ac. Running autoupdate is advised.
459 - AC_DEFINE/AC_DEFINE_UNQUOTED
461 We have to stop using the old compatibility scheme --that tried to
462 avoid useless backslashes-- because Libtool 1.4.3 contains a
464 AC_DEFINE([error_t], [int],
465 [Define to a type to use for \`error_t' if it is not
466 otherwise available.])
468 We have to quote the single quotes and backslashes with \. The old
469 compatibility scheme saw that ` was backslashed, and therefore did
470 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
471 compatible with Libtool. Autoconf 2.55 is, but in some cases might
472 produce more \ than wanted.
474 Please, note that in the future the same problem will happen with
475 AC_MSG_*: use `autoreconf -f -Wall'.
479 - Portability of the Autoconf package to Solaris.
481 - Spurious warnings caused by config.status.
482 This bug is benign, but painful: on some systems (typically
483 FreeBSD), warnings such as:
485 config.status: creating Makefile
486 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
488 could be issued. This is fixed.
491 Simultaneous executions of config.status are possible again.
493 - Precious variables accumulation
495 config.status could stack several copies of the precious variables
499 ** Plans for later versions
503 The compatibility hooks with the old scheme will be completely
504 removed. Please, advice/use `--build', `--host', and `--target'
507 - AC_CHECK_HEADER, AC_CHECK_HEADERS
509 The tests will be stricter, please make sure your invocations are
514 Shell functions will gradually be introduced, probably starting with
515 Autotest. If you know machines which are in use that you suspect
516 *not* to support shell functions, please run the test suite of
517 Autoconf 2.55 on it, and report the results to
518 bug-autoconf@gnu.org.
522 Special characters in AC_MSG_* need not be quoted. Currently,
523 Autoconf has heuristics to decide when a string is escaped, or has
524 to be escaped. This scheme is fragile, and will be removed; the
525 only risk is uglified messages. Please, run `autoreconf -f -Wall'
526 to find occurrences that will be affected.
528 * Major changes in Autoconf 2.54
530 Released 2002-09-13 by Akim Demaille.
534 - autoreconf no longer changes the version of the gettext/po/intl
535 support files. It now adds the files the correspond to the
536 AM_GNU_GETTEXT_VERSION declared in configure.ac.
538 Warning: It now relies on the 'autopoint' program, which is part
539 of GNU gettext 0.11.4 and newer.
541 Please note that you need to have a GNU gettext version that
542 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
543 in configure.ac. You can upgrade to newer GNU gettext versions,
544 though, without needing to change configure.ac.
546 - The -I DIR or --include=DIR option now appends DIR to the include path
547 instead of prepending; this is for consistency with other GNU tools.
548 The new -B DIR or --prepend-include=DIR option has the old behavior.
553 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
554 Please, remove lines such as
556 # This is necessary so that .o files in LIBOBJS are also
557 # built via the ANSI2KNR-filtering rules.
558 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
560 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
561 your Makefiles either.
563 - AC_CONFIG_LINKS now makes copies if it can't make links.
565 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
566 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
567 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
569 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
571 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
573 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
577 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
578 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
579 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
582 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
585 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
586 for an AC_LIBOBJ replacement.
590 - Spurious complaints from `m4_bmatch' about invalid regular
591 expressions are suppressed.
593 - Empty top_builddirs are properly handled.
595 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
598 Now colon in the optional path arguments are properly handled.
600 ** Improved portability
602 - Both Autoconf the package, and the scripts it produces, should run
603 more reliably with Zsh. Bear in mind it is the default Bourne shell
606 - Autoconf and the scripts it produces no longer assume the existence of
607 the obsolescent commands egrep and fgrep.
611 - Limitations of Make
615 The GNATS base moved to
616 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
617 (It is no longer available, though.)
622 Now contains the list of ouput variables and files (AC_SUBST,
625 * Major changes in Autoconf 2.53
627 Released 2002-03-08 by Akim Demaille.
631 Perl 5.005_03 or later is required: autom4te is written in Perl and is
632 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
638 Argument requirements, output variables, defined macros.
639 - M4sugar, M4sh, Autotest
641 - Double quoting macros
642 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
644 The Autoconf manual is now distributed under the terms of the GNU FDL.
645 - Section `Hosts and Cross-Compilation'
646 Explains the rationale for the 2.5x changes in the cross-compilation
647 chain, and in the relationships between build, host, and target
649 Emphasizes that `cross-compilation' == `--host is given'.
650 If you are working on compilers etc., be sure to read this section.
651 - Section `AC_LIBOBJ vs. LIBOBJS'
652 Explains why assigning LIBOBJS directly is now an error.
653 Details how to update the code.
658 Now used instead of hard coded line numbers.
659 This eases the comparison of `configure's, and diminishes the
660 pressure over control version archives.
661 Automatic replacement for shells that don't support this feature.
662 - New output variables
663 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
668 Autoconf and Autotest modes are provided.
673 New, used by the Autoconf suite to cache and speed up most processing.
675 Supported by autom4te, autoconf and autoheader.
677 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
678 autoupdate, and autoreconf.
680 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
681 automake options are to be given via AUTOMAKE_OPTIONS.
683 Runs gettextize and libtoolize when appropriate.
685 --m4dir is no longer supported.
687 Now runs only in the specified directories, defaulting to `.',
688 but understands AC_CONFIG_SUBDIRS for dependent directories.
689 Before, it used to run on all the `configure.ac' found in the
691 Independent packages are properly updated.
695 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
697 Under the user pressure, $? is finally available. Probably a mistake.
698 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
699 - Precious variables accumulation
700 config.status could stack several copies of the precious variables
702 - AC_PATH_PROG and family.
703 Works properly when given a literal path.
705 Somewhere since 2.13, the result had been reversed.
709 - AC_C_BIGENDIAN supports the cross-compiling case.
710 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
711 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
712 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
714 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
715 precision than `double'.
720 It now defines the preprocessor symbols PACKAGE_NAME,
721 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
725 Admits a fourth optional parameter: the tar name.
727 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
728 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
729 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
732 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
733 Are much less expensive when using long lists of files.
736 Works with shell variables, and non alphanumeric names.
740 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
741 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
743 - AC_FUNC_STRTOD substitutes POW_LIB.
748 * Major changes in Autoconf 2.52
750 Released 2001-07-18 by Akim Demaille.
755 This feature was present in autoconf 2.50 but was not documented.
756 For example, `@<:@' is translated to `[' just before output. This
757 is useful when writing strings that contain unbalanced quotes, or
758 other hard-to-quote constructs.
759 - m4_pattern_forbid, m4_pattern_allow
760 - Tips for upgrading from 2.13.
761 - Using autoscan to maintain a configure.ac.
764 - Now include stdint.h.
765 - sys/types.h and sys/stat.h are guarded.
766 - strings.h is included if available, and not conflicting with string.h.
769 - The test suite is more robust and presents less false failures.
770 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
771 - configure accepts --prefix='' again.
772 - AC_CHECK_LIB works properly when its first argument is not a
774 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
775 - build_, host_, and target_alias are AC_SUBST as in 2.13.
776 - AC_ARG_VAR properly propagates precious variables inherited from the
777 environment to ./config.status.
778 - Using --program-suffix/--program-prefix is portable.
779 - Failures to detect the default compiler's output extension are less
781 - `config.status foo' works properly when `foo' depends on variables
782 set in an AC_CONFIG_THING INIT-CMD.
783 - autoheader is more robust to broken input.
784 - Fixed Fortran name-mangling and link tests on a number of systems,
785 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
788 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
789 specify pre-includes. In this case, the headers are compiled with
790 cc, not merely preprocessed by cpp. Therefore it is the _usability_
791 of a header which is checked for, not just its availability.
792 - AC_ARG_VAR refuses to run configure when precious variables have
794 - Versions of compilers are dumped in the logs.
795 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
798 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
799 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
800 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
801 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
802 Be sure to read `Upgrading from Version 2.13' to understand why
803 running `autoupdate' is needed.
804 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
805 a main-like routine is required/possible when linking C/C++ with
806 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
807 - AC_FUNC_GETPGRG behaves better when cross-compiling.
809 * Major changes in Autoconf 2.51
810 There was no release of Autoconf 2.51 since some packagers had used
811 this version number without permission to ship intermediary versions
812 of 2.50. The version was skipped to avoid confusion.
814 * Major changes in Autoconf 2.50
816 Released 2001-05-21 by Akim Demaille.
819 There have been far too many to enumerate them here. Check out
820 ChangeLog if you really want to know more.
822 ** Improved documentation
823 In particular, portability issues are better covered.
826 All the standard GNU Makefile targets are supported. The layout has
827 changed: m4/ holds the M4 extensions Autoconf needs for its
828 configuration, doc/ contains the documentation, and tests/ contains
831 ** Man pages are provided
832 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
833 config.guess, config.sub.
837 Provides a safe and powerful means to trace the macro uses. This
838 provide the parsing layer for tools which need to `study'
842 Specify what category of warnings should be enabled.
844 - When recursing into subdirectories, try for configure.gnu before
845 configure to adapt for packages not using autoconf on case-insensitive
849 More errors are now caught (circular AC_REQUIRE dependencies,
850 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
851 etc.). In addition, their location and call stack are given.
854 autoupdate is much more powerful, and is able to provide the glue code
855 which might be needed to move from an old macro to its newer
858 You are strongly encouraged to use it to modernize both your
859 `configure.in' and your .m4 extension files.
862 The internal machinery of autoheader has completely changed. As a
863 result, using `acconfig.h' should be considered to be obsoleted, and
864 you are encouraged to get rid of it using the AH macros.
869 ** Fortran 77 compilers
870 Globally, the support for Fortran 77 is considerably improved.
872 Support for automatically determining a Fortran 77 compiler's
873 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
874 provided to wrap C/C++ identifiers, thus making it easier and more
875 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
876 call C/C++ routines. See the Texinfo documentation for details.
879 The test suite no longer uses DejaGNU. It should be easy to submit
880 test cases in this new framework.
883 - --help, --help=long, -hl
884 no longer dumps useless items.
886 lists only specific options.
887 - --help=recursive, -hr
888 displays the help of all the embedded packages.
889 - Remembers environment variables when reconfiguring.
890 The previous scheme to set envvar before running configure was
892 what prevented configure from remembering the environment in which
893 it was run, therefore --recheck was run in an inconsistent
894 environment. Now, one should run
896 and then --recheck will work properly. Variables declared with
897 AC_ARG_VAR are also preserved.
899 $build defaults to `config.guess`, $host to $build, and then $target
901 Cross-compilation is a global status of the package, it no longer
902 depends upon the current language.
903 Cross compilation is enabled iff the user specified `--host'.
904 `configure' now fails if it can't run the executables it compiles,
905 unless cross-compilation is enabled.
907 The cache file is disabled by default. The new options
908 `--config-cache', `-C' set the cache to `config.cache'.
912 Much faster on most architectures.
913 - concurrent executions
914 It is safe to use `make -j' with config.status.
915 - human interface improved
916 It is possible to invoke
917 ./config.status foobar
918 instead of the former form (still valid)
919 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
920 CONFIG_FILES=foobar:foo.in:bar.in \
922 The same holds for configuration headers and links.
923 You can instantiate unknown files and headers:
924 ./config.status --header foo.h:foo.h.in --file bar:baz
925 - has a useful --help
926 - accepts special file name "-" for stdin/stdout
931 Specify additional copyright information.
934 Now expects the identity of the package as argument.
938 Most macros, if not all, now strictly follow the `one quotation
939 level' rule. This results in a more predictable expansion.
942 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
943 configure scripts, was fixed by Axel Thimm.
947 Document and ask for the registration of an envvar.
950 Specifies the file which `configure' should look for when trying to
951 find the source tree (used to be handled by AC_INIT).
954 To add new actions to config.status. Should be used instead of
958 Replaces AC_LINK_FILES.
960 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
961 AC_CONFIG_LINKS, and AC_CONFIG_FILES
962 They now obey sh: you should no longer use shell variables as
965 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
966 AC_CONFIG_SUBDIRS($my_subdirs)
970 if test "$package_foo_enabled" = yes; then
971 AC_CONFIG_SUBDIRS(foo)
975 To format an Autoconf macro's help string so that it looks pretty
976 when the user executes `configure --help'.
979 ** Generic Test Macros
981 The interface of the AC_CHECK families of macros (decl, header,
982 type, member, func) is now uniform. They support the same set of
985 - AC_CHECK_DECL, AC_CHECK_DECLS
986 To check whether a symbol is declared.
988 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
989 No longer need a cross-compilation default.
992 The test it performs is much more robust than previously, and makes
993 it possible to test builtin types in addition to typedefs.
994 It is now schizophrenic:
995 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
996 remains for backward compatibility, but its use is discouraged.
997 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
998 behaves exactly like the other AC_CHECK macros.
1001 Checks whether given types are supported by the system.
1003 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
1004 Check for given members in aggregates (e.g., pw_gecos in struct
1008 Checks if the compiler supports ISO C, included when needs special
1012 Checking whether the preprocessor indicates missing includes by the
1013 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1016 Takes a language as argument and replaces AC_LANG_C,
1017 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1019 - AC_LANG_PUSH, AC_LANG_POP
1020 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1023 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1024 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1025 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1029 Sets GETGROUPS_LIBS.
1031 - AC_FUNC_GETLOADAVG
1032 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1035 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1038 Arrange for large-file support.
1040 - AC_EXEEXT, AC_OBJEXT
1041 You are no longer expected to use them: their computation is
1042 performed by default.
1044 ** C++ compatibility
1045 Every macro has been revisited in order to support at best CC=c++.
1047 Major changes in Autoconf 2.14:
1048 There was no release of GNU Autoconf 2.14.
1050 Major changes in Autoconf 2.13:
1052 Released 1999-05-01 by Ben Elliston.
1054 * Support for building on Win32 systems where the only available C or
1055 C++ compiler is the Microsoft Visual C++ command line compiler
1056 (`cl'). Additional support for building on Win32 systems which are
1057 using the Cygwin or Mingw32 environments.
1058 * Support for alternative object file and executable file extensions.
1059 On Win32, for example, these are .obj and .exe. These are discovered
1060 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1061 @EXEEXT@ in the output, respectively.
1062 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1063 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1064 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1065 * AC_DEFINE now has an optional third argument for a description to be
1066 placed in the config header input file (e.g. config.h.in).
1067 * The C++ code fragment compiled for the C++ compiler test had to be
1068 improved to include an explicit return type for main(). This was
1069 causing failures on systems using recent versions of the EGCS C++
1071 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1072 script to report that `sometype_t' was present when only `type_t'
1074 * Merge of the FSF version of config.guess and config.sub to modernize
1075 these scripts. Add support for a few new hosts in config.guess.
1076 Incorporate latest versions of install-sh, mkinstalldirs and
1077 texinfo.tex from the FSF.
1078 * autoreconf is capable of running automake if necessary (and
1080 * Support for Fortran 77. See the Texinfo documentation for details.
1081 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1083 Major changes in Autoconf 2.12:
1085 Released 1996-11-26 by David J. MacKenzie
1087 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1088 concatenating multiple input files separated by colons, like so:
1089 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1090 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1091 The arguments may be shell variables, to compute the lists on the fly.
1092 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1093 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1096 Major changes in Autoconf 2.11:
1098 Released November 18th, 1996, by David J. MacKenzie
1100 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1101 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1102 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1103 * AC_CONFIG_HEADER expands shell variables in its argument.
1104 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1105 * The "checking..." messages and the source code for test programs that
1106 fail are saved in config.log.
1107 * Another workaround has been added for seds with small command length limits.
1108 * config.sub and config.guess recognize more system types.
1111 Major changes in Autoconf 2.10:
1113 Released May 7th, 1996, by Roland McGrath
1116 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1117 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1119 Major changes in Autoconf 2.9:
1121 Released March 16th, 1996, by Roland McGrath
1125 Major changes in Autoconf 2.8:
1127 Released March 8th, 1996, by Roland McGrath
1131 Major changes in Autoconf 2.7:
1133 Released November 22nd, 1995, by David J. MacKenzie
1137 Major changes in Autoconf 2.6:
1139 Released November 20th, 1995, by David J. MacKenzie
1143 Major changes in Autoconf 2.5:
1145 Released November 17th, 1995, by Roland McGrath
1147 * New configure options --bindir, --libdir, --datadir, etc., with
1148 corresponding output variables.
1149 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1150 * config.log contains the command being run as well as any output from it.
1151 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1152 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1153 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1154 AC_CHECK_TOOL can search a path other than $PATH.
1155 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1157 Major changes in Autoconf 2.4:
1159 Released June 14th, 1995, by David J. MacKenzie
1161 * Fix a few bugs found by Emacs testers.
1163 Major changes in Autoconf 2.3:
1165 Released March 27th, 1995, by David J. MacKenzie
1167 * Fix the cleanup trap in several ways.
1168 * Handle C compilers that are picky about option placement.
1169 * ifnames gets the version number from the right directory.
1171 Major changes in Autoconf 2.2:
1173 Released March 8th, 1995, by David J. MacKenzie
1175 * The ifnames utility is much faster but requires a "new awk" interpreter.
1176 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1177 library before existing libs, not after, in case it uses them.
1178 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1179 * Lots of bug fixes.
1180 * Many additions to the TODO file :-)
1182 Major changes in Autoconf 2.1:
1184 Released November 4th, 1994, by David J. MacKenzie
1187 * More explanations in the manual.
1188 * Fix a spurious failure in the testsuite.
1189 * Clarify some warning messages.
1190 * autoreconf by default only rebuilds configure and config.h.in files
1191 that are older than any of their particular input files; there is a
1192 --force option to use after installing a new version of Autoconf.
1194 Thanks to everybody who's submitted changes and additions to Autoconf!
1195 I've incorporated many of them, and am still considering others for
1196 future releases -- but I didn't want to postpone this release indefinitely.
1198 Caution: don't indiscriminately rebuild configure scripts with
1199 Autoconf version 2. Some configure.in files need minor adjustments to
1200 work with it; the documentation has a chapter on upgrading. A few
1201 configure.in files, including those for GNU Emacs and the GNU C
1202 Library, need major changes because they relied on undocumented
1203 internals of version 1. Future releases of those packages will have
1204 updated configure.in files.
1206 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1207 Autoconf now makes heavy use of M4 diversions, which were implemented
1208 inefficiently in GNU M4 releases before 1.3.
1210 Major changes in Autoconf 2.0:
1212 Released October 26th, 1994, by David J. MacKenzie
1214 ** New copyright terms:
1215 * There are no restrictions on distribution or use of configure scripts.
1218 * Autoconf manual is reorganized to make information easier to find
1219 and has several new indexes.
1220 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1223 * autoscan to generate a preliminary configure.in for a package by
1224 scanning its source code for commonly used nonportable functions,
1225 programs, and header files.
1226 * ifnames to list the symbols used in #if and #ifdef directives in a
1228 * autoupdate to update a configure.in to use the version 2 macro names.
1229 * autoreconf to recursively remake configure and configuration header
1230 files in a source tree.
1232 ** Changed utilities:
1233 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1234 * autoconf and autoheader can look for package-local definition files
1235 in an alternate directory.
1238 * AC_CACHE_VAL to share results of tests between configure runs.
1239 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1240 that macros invoked with AC_REQUIRE don't interrupt other macros.
1241 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1242 support deciding unguessable features based on the host and target types.
1243 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1244 * AC_ARG_PROGRAM to use the options --program-prefix,
1245 --program-suffix, and --program-transform-name to change the names
1246 of programs being installed.
1247 * AC_PREFIX_DEFAULT to change the default installation prefix.
1248 * AC_TRY_COMPILE to compile a test program without linking it.
1249 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1250 * AC_CHECK_LIB to check for a particular function and library.
1251 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1252 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1253 * AC_SUBST_FILE to insert one file into another.
1254 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1255 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1256 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1257 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1260 * Many macros renamed systematically, but old names are accepted for
1261 backward compatibility.
1262 * AC_OUTPUT adds the "automatically generated" comment to
1263 non-Makefiles where it finds @configure_input@ in an input file, to
1264 support files with various comment syntaxes.
1265 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1266 files when they are not enclosed in @ signs.
1267 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1268 override the file name "config.status".
1269 * AC_OUTPUT takes an optional argument for passing variables from
1270 configure to config.status.
1271 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1272 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1273 CPPFLAGS, and LDFLAGS from the environment.
1274 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1275 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1276 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1277 srcdir/../.. by default.
1278 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1279 * AC_DEFINE no longer prints anything, because of the new result reporting
1280 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1281 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1282 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1283 --enable- and --with- options.
1284 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1285 execute on success or failure.
1286 * Checking for C functions in C++ works.
1289 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1290 better maintained with them.
1291 * AC_ARG_ARRAY removed because no one was likely using it.
1292 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1293 take arguments, for consistency with all of the other specific checks.
1296 * Comes with config.sub and config.guess, and uses them optionally.
1297 * Uses config.cache to cache test results. An alternate cache file
1298 can be selected with the --cache-file=FILE option.
1299 * Uses optional shell scripts $prefix/share/config.site and
1300 $prefix/etc/config.site to perform site or system specific initializations.
1301 * configure saves compiler output to ./config.log for debugging.
1302 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1303 * acsite.m4 is the new name for the system-wide aclocal.m4.
1304 * Has a DejaGnu test suite.
1306 Major changes in Autoconf 1.11:
1308 * AC_PROG_INSTALL calls install.sh with the -c option.
1309 * AC_SET_MAKE cleans up after itself.
1310 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1311 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1313 Plus a few other bug fixes.
1315 Major changes in Autoconf 1.10:
1317 * autoheader uses config.h.bot if present, analogous to config.h.top.
1318 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1320 * AC_PROG_CXX looks for cxx as a C++ compiler.
1322 Plus several bugs fixed.
1324 Major changes in Autoconf 1.9:
1326 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1327 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1328 and autoheader generates entries for those names automatically.
1329 * AC_FIND_X gets the result from xmkmf correctly.
1330 * AC_FIND_X assumes no X if --without-x was given.
1331 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1332 * AC_PROG_INSTALL finds OSF/1 installbsd.
1334 Major changes in Autoconf 1.8:
1337 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1338 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1339 for checking both C++ and C features in one configure script.
1340 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1341 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1342 AC_SET_MAKE, AC_ENABLE.
1345 * AC_FIND_X looks for X in more places.
1346 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1347 install.sh is distributed with Autoconf.
1348 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1349 a rewrite of quoting in AC_DEFINE.
1350 * AC_OUTPUT adds its comments in C format when substituting in C files.
1351 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1353 ** New or changed command line options:
1354 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1355 * configure accepts --without-PACKAGE, which sets withval=no.
1356 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1357 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1358 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1359 * configure accepts and ignores most other Cygnus configure options, and
1360 warns about unknown options.
1361 * config.status accepts --help, --version options.
1363 ** File names and other changes:
1364 * Relative srcdir values are not made absolute.
1365 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1366 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1367 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1368 * The example Makefile dependencies for configure et al. work better.
1369 * Namespace cleanup: all shell variables used internally by Autoconf
1370 have names beginning with `ac_'.
1372 More big improvements are in process for future releases, but have not
1373 yet been (variously) finished, integrated, tested, or documented enough
1376 Major changes in Autoconf 1.7:
1378 * New macro AC_OBSOLETE.
1379 * Bugs in Makefile.in fixed.
1380 * AC_LONG_FILE_NAMES improved.
1382 Major changes in Autoconf 1.6:
1384 * New macro AC_LONG_64_BITS.
1385 * Multiple .h files can be created.
1386 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1387 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1388 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1389 * Unused --no-create option to configure removed.
1390 * autoheader doesn't change the timestamp of its output file if
1391 the file didn't change.
1392 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1393 * config.status checks three optional environment variables to
1394 modify its behavior.
1395 * The usual bug fixes.
1397 Major changes in Autoconf 1.5:
1399 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1400 * autoconf and autoheader scripts have GNU standards conforming
1401 --version and --help options (they print their message and exit).
1404 Major changes in Autoconf 1.4:
1406 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1407 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1408 * autoconf and autoheader use the M4 environment variable to determine the
1409 name of the M4 program to use.
1410 * The --macrodir option to autoconf and autoheader specifies the directory
1411 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1412 * autoconf and autoheader can take `-' as their file names, which means to
1413 read stdin as input.
1414 * Resulting configure scripts can take a --verbose option which causes them
1415 to print the results of their tests.
1416 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1417 shell characters, etc. will be preserved during various stages of
1418 expansion done by the shell. If you don't want this, use
1419 AC_DEFINE_UNQUOTED instead.
1420 * Much textual processing done with external calls to tr and sed have been
1421 internalized with builtin M4 `patsubst' and `translit' calls.
1422 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1423 set the shell variables `gen_files' and `gen_config' to the list of
1424 file names to output.
1425 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1426 "lex.yy" or "lexyy", depending on the system.
1427 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1429 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1430 * AC_CONST works much more reliably on more systems.
1433 Major changes in Autoconf 1.3:
1435 configure no longer requires awk for packages that use a config.h.
1436 Support handling --with-PACKAGE options.
1437 New `autoheader' script to create `config.h.in' from `configure.in'.
1438 Ignore troublesome -lucb and -lPW when searching for alloca.
1439 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1440 Improve detection of STDC library.
1441 Add AC_HAVE_LIBRARY to check for non-default libraries.
1442 Function checking should work with future GNU libc releases.
1444 Major changes in Autoconf 1.2:
1446 The --srcdir option is now usually unnecessary.
1447 Add a file containing sample comments describing CPP macros.
1448 A comment in config.status tells which host it was configured on.
1449 Substituted variable values can now contain commas.
1450 Fix bugs in various feature checks.
1452 Major changes in Autoconf 1.1:
1454 Added AC_STRCOLL macro.
1455 Made AC_GETLOADAVG check for more things.
1456 AC_OUTPUT argument is now optional.
1461 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1462 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1464 This file is part of GNU Autoconf.
1466 GNU Autoconf is free software; you can redistribute it and/or modify
1467 it under the terms of the GNU General Public License as published by
1468 the Free Software Foundation; either version 2, or (at your option)
1471 GNU Autoconf is distributed in the hope that it will be useful,
1472 but WITHOUT ANY WARRANTY; without even the implied warranty of
1473 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1474 GNU General Public License for more details.
1476 You should have received a copy of the GNU General Public License
1477 along with GNU Autoconf; see the file COPYING. If not, write to
1478 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
1479 Boston, MA 02110-1301, USA.