1 GNU Autoconf NEWS - User visible changes.
3 * Major changes in Autoconf 2.61b (????-??-??)
5 ** Many optimizations have been applied to make overall execution faster.
7 ** Autotest now makes use of shell functions.
9 ** config.status now uses awk instead of sed also for config headers.
11 - As a side effect, AC_DEFINE and AC_DEFINE_UNQUOTED now handle multi-line
12 values, i.e., backslash-newline combinations are handled correctly.
13 Further, for config headers, the total size of values is not limited by
14 the POSIX length limit of text lines any more, only each single line.
16 ** Autoconf is now licensed under the General Public License version 3
17 or later (GPLv3+). As with earlier versions, the license includes
18 an exception clause so that you may release a configure script
19 generated by autoconf under the license of your own program.
20 FIXME - revisit this line once exception clause is finalized.
22 ** New Autoconf macros:
23 AC_AUTOCONF_VERSION AC_OPENMP AC_PATH_PROGS_FEATURE_CHECK
25 ** AC_C_BIGENDIAN now supports universal binaries a la Mac OS X.
27 ** AC_C_RESTRICT now prefers to #define 'restrict' to a variant spelling
28 like '__restrict' if the variant spelling is available, as this is
29 more likely to work when mixing C and C++ code.
31 ** AC_CHECK_ALIGNOF's type argument T is now documented better: it must
32 be a string of tokens such that "T y;" is a valid member declaration
35 ** AC_CHECK_SIZEOF now accepts objects as well as types: the general rule
36 is that sizeof (X) works, then AC_CHECK_SIZEOF (X) should work.
38 ** AC_CHECK_TYPE and AC_CHECK_TYPES now work on any C type-name; formerly,
39 they did not work for function types. In C++, they now work on any
40 type-id that can be the operand of sizeof; this is similar to C,
41 except it excludes anonymous struct and union types. Formerly,
42 some (but not all) C++ types involving anonymous struct and union
43 were accepted, though this was not documented.
45 ** AC_CONFIG_LINKS now prefers to link against files in the build tree
46 if found, and it works to link against a file of the same name in
47 the source tree, even if both trees coincide.
49 ** AC_INIT no longer alters $@; regression introduced in 2.60.
51 ** AC_USE_SYSTEM_EXTENSIONS now defines _ALL_SOURCE for Interix platforms.
53 ** AS_HELP_STRING no longer underquotes its first argument; it also handles
54 the case where the first argument contains single-quoted commas.
55 For example, "AS_HELP_STRING([-a, [--arg[=foo]]], [bar])" produces:
56 " -a, --arg=[foo] bar"
57 Additionally, the macro now takes two additional arguments,
58 indent-column and wrap-column; these should not normally be needed,
59 but can be used to fine-tune how the output text is wrapped.
61 ** The command 'autoconf -' now correctly processes a file from stdin.
63 ** For all of the directory arguments for 'configure', such as '--prefix'
64 or '--bindir', trailing slashes are stripped. As an example, if
65 tab completion in the user's shell appends trailing slashes, the
66 command './configure --prefix=/usr/' will still result in an
67 expanded libdir value of /usr/lib, not /usr//lib.
69 ** `configure --help=recursive' now works in read-only trees and from
70 unconfigured build trees.
72 ** AT_BANNER is now documented.
74 ** AT_SETUP now handles macro expansions properly when calculating line
77 ** Autotest now determines $srcdir correctly.
79 ** Autoconf now requires GNU M4 1.4.5 or later. Earlier versions of M4 have
80 a bug in macro tracing that interferes with the interaction between
81 Autoconf and Automake. GNU M4 1.4.8 or later is recommended. The
82 configure search for a working M4 is improved.
84 ** Documentation for m4sugar is improved.
86 - The following macros were previously available as undocumented
87 interfaces; the macros are now documented as stable interfaces.
89 __oline__ m4_assert m4_bmatch m4_bpatsubsts m4_car m4_case
90 m4_cdr m4_default m4_divert_once m4_divert_pop m4_divert_push
91 m4_divert_text m4_do m4_errprintn m4_fatal m4_flatten
92 m4_ifndef m4_ifset m4_ifval m4_ifvaln m4_location
93 m4_n m4_shiftn m4_strip m4_warn
95 - The following macros were previously available as undocumented
96 interfaces, but had bug fixes or semantic changes as part of this
97 release. Packages that relied on the undocumented behavior
98 should be analyzed to make sure they will still work with the
99 new documented behavior.
101 m4_cmp m4_list_cmp m4_join m4_map m4_map_sep m4_sign
102 m4_text_box m4_text_wrap m4_version_compare
104 - Packages using the undocumented m4sugar macro m4_PACKAGE_VERSION
105 should consider using the new AC_AUTOCONF_VERSION instead.
107 - m4sugar macros that are not documented in the manual are still
108 deemed experimental, and should not be used outside of Autoconf.
110 ** The m4sugar macros m4_append and m4_append_uniq, first documented in
111 2.60, have been fixed to treat both the string and the separator
112 arguments consistently with regards to quoting. Prior to this fix,
113 m4_append_uniq could mistakenly duplicate entries if the expansion
114 of the separator resulted in a different string (for example, if it
115 contained quotes, a comma, or a macro name). However, it means
116 that programs previously using
117 m4_append([name], [string], [[, ]])
118 are now using a four-character separator instead of the intended
119 comma and space. If you need portability to earlier versions of
120 Autoconf, you can insert the following snippet after AC_INIT but
121 before any other macro expansions, to enforce the new semantics:
122 m4_pushdef([m4_append], [m4_define([$1],
123 m4_ifdef([$1], [m4_defn([$1])[$3]])[$2])])
124 Additionally, m4_append_uniq now takes optional parameters that can
125 be used to take action depending on whether anything was appended,
126 and warns if a non-empty separator occurs within the string being
127 appended, since that can lead to duplicates.
129 ** The following m4sugar macros are new:
130 m4_append_uniq_w m4_apply m4_combine m4_cond m4_count
131 m4_dquote_elt m4_echo m4_expand m4_ignore m4_make_list m4_max
132 m4_min m4_newline m4_shift2 m4_shift3 m4_unquote
134 ** Warnings are now generated by default when an installer invokes
135 'configure' with an unknown --enable-* or --with-* option.
136 These warnings can be disabled with the new AC_DISABLE_OPTION_CHECKING
137 macro, or by invoking 'configure' with --disable-option-checking.
139 ** For portability with the eventual M4 2.0, macros should no longer use
140 anything larger than $9 to refer to arguments.
142 ** Existing obsolete macros
143 The documentation for the following macros is adjusted to make it
144 more clear that they have previously been marked obsolete, as their
145 functionality can be accomplished by other macros. We have no
146 current plans to remove them from Autoconf.
148 AC_ENABLE AC_STRUCT_ST_BLKSIZE AC_STRUCT_ST_RDEV AC_WITH
150 ** Newly obsolete macros
151 The following macros have been marked obsolete, as they only
152 perform a subset of AC_USE_SYSTEM_EXTENSIONS. We have no current
153 plans to remove them.
155 AC_AIX AC_GNU_SOURCE AC_ISC_POSIX AC_MINIX
157 ** AC_C_LONG_DOUBLE is obsolescent.
158 The documentation now says that AC_C_LONG_DOUBLE is obsolescent: it
159 tests for problems that are so old that it is no longer of
160 practical importance on current systems. New programs need not use
161 AC_C_LONG_DOUBLE. We have no current plans to remove it.
163 ** AC_DIAGNOSE, AC_WARNING, and AC_FATAL are obsolescent.
164 The documentation now favors the use of M4sugar macros m4_warn and
165 m4_fatal, since the naming makes it more obvious that the
166 diagnostics are associated with M4 expansion (ie. when running
167 `autoconf'), and offers less confusion with the AC_MSG_ERROR,
168 AC_MSG_FAILURE, and AC_MSG_WARN macros which manage diagnostics
169 when running `configure'. We have no current plans to remove these
172 * Major changes in Autoconf 2.61a (2006-12-11)
174 ** AC_FUNC_FSEEKO was broken in 2.61; it didn't make fseeko and ftello visible
175 on many platforms. This has been fixed.
177 ** AC_FUNC_SETVBUF_REVERSED is now obsolete. It is still defined for backward
178 compatibility but it does nothing. The macro was already
179 obsolescent, as the last systems to have the problem were those
180 based on SVR2, which became obsolete in 1987. The macro had bugs
181 on some modern systems and could no longer be maintained reliably
182 due to lack of ancient systems to test it on.
184 ** config.status now uses awk instead of sed for most substitutions, for speed.
186 - As a side effect multi-line values of substituted variables no
187 longer have a small limit in total size, though for portability
188 each line should not exceed the POSIX length limit for text lines.
190 - It is now documented that Makefile.in should not contain
191 overlapping variable occurrences, e.g., @VAR1@VAR2@.
192 Autoconf's behavior was always iffy in such cases, and the
193 awk implementation has changed the behavior.
195 ** Many uses of 'echo' have been rewritten so that Autoconf-generated
196 scripts have fewer problems with strings or file names containing
197 embedded special characters such as backslash or leading "-". This
198 was implemented by using `printf '%s\n' "$foo"' instead of `echo
199 "$foo"' when printf works. Due to the implementation technique
200 used, Autoconf-generated scripts now run considerably more slowly
201 on ancient implementations lacking printf. However, this should
202 not be a problem, since Autoconf-generated scripts in practice
203 invariably find a more-modern shell these days.
205 * Major changes in Autoconf 2.61 (2006-11-17)
207 ** New macros AC_C_FLEXIBLE_ARRAY_MEMBER, AC_C_VARARRAYS.
209 ** AC_ARG_ENABLE and AC_ARG_WITH now allow '.' in feature and package names.
211 * Major changes in Autoconf 2.60b (2006-10-22)
214 Autoconf-generated shell scripts no longer export BIN_SH, due to
215 configuration hassles with this. Installers who need BIN_SH in
216 their environment should set it before invoking 'configure' and
217 'make'. As far as we know, this affects only Unixware installations.
219 ** Obsolescent macros
220 The documentation now says that the following macros are obsolescent,
221 as they are superseded by Gnulib:
223 AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
225 New programs should use the Gnulib counterparts of these macros.
226 We have no current plans to remove them from Autoconf.
228 ** AC_COMPUTE_INT no longer caches or reports results.
230 ** AC_CHECK_DECL now also works with aggregate objects.
232 ** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
234 ** GNU M4 1.4.7 or later is now recommended.
237 New M4sugar macro, which is more secure than the POSIX M4 maketemp.
240 Now an alias for m4_mkstemp.
242 * Major changes in Autoconf 2.60a (2006-08-25)
244 ** GNU M4 1.4.6 or later is now recommended.
246 ** The check for C99 now tests for varargs macros, as documented.
247 It also tests that the preprocessor supports 64-bit integers.
249 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
250 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
252 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
253 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
254 two macros are different, so autoupdate will not change the old private name
255 to the new one. _AC_COMPUTE_INT may be removed in a future release.
257 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
258 that long long types be at least 64 bits wide, as C99 and tradition
259 requires. Formerly, they accepted implementations of any width.
262 * Major changes in Autoconf 2.60
264 Released 2006-06-23, by Ralf Wildenhues.
266 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
267 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
268 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
270 ** Provide a way to turn off warnings about the changed directory variables.
272 * Major changes in Autoconf 2.59d
274 Released 2006-06-05, by Ralf Wildenhues.
276 ** GNU make now recommended for VPATH builds
277 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
278 only if you use GNU make. In practice, other 'make' implementations
279 have too many subtle incompatibilities in their support for VPATH.
280 Many packages (including Autoconf itself) are portable to other
281 'make' implementations, but some packages are not, and recommending
282 GNU make keeps the installation instructions simpler.
284 ** Even more safety checks for the new Directory variables:
285 Warn about suspicious `${datarootdir}' found in config files output.
287 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
288 These never-documented macros and variables have been marked with
289 comments saying that they may be removed in a future release,
290 because their use can lead to unintended code being executed.
291 If you need functionality that only these macros or variables
292 currently supply, please write bug-autoconf@gnu.org.
294 ** AC_SUBST, AC_DEFINE
295 Literal arguments to these are passed to m4_pattern_allow now.
298 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
299 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
300 obsolete K&R tests in the Automake test suite.
309 Now more robust with special characters in file names, or when
310 multiple processes create the same directory at the same time.
312 ** Obsolescent macros
313 The documentation now says that the following macros are obsolescent:
314 they test for problems that are so old that they are no longer of
315 practical importance on current systems.
317 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
318 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
319 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
320 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
321 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
322 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
323 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
324 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
326 New programs need not use these macros. We have no current plans to
330 For compatibility with future Libtool 2.0, autoreconf will invoke
331 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
334 * Major changes in Autoconf 2.59c
336 Released 2006-04-12, by Ralf Wildenhues.
338 ** The configure command now redirects standard input from /dev/null,
339 to help avoid problems with subsidiary commands that might mistakenly
340 read standard input. AS_ORIGINAL_STDIN_FD points to the original
341 standard input before this redirection, if you really want configure to
342 read from standard input.
344 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
345 The following directory variables are new:
347 datarootdir read-only architecture-independent data root [PREFIX/share]
348 localedir locale-specific message catalogs [DATAROOTDIR/locale]
349 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
350 htmldir html documentation [DOCDIR]
351 dvidir dvi documentation [DOCDIR]
352 pdfdir pdf documentation [DOCDIR]
353 psdir ps documentation [DOCDIR]
355 The following variables have new default values:
357 datadir read-only architecture-independent data [DATAROOTDIR]
358 infodir info documentation [DATAROOTDIR/info]
359 mandir man documentation [DATAROOTDIR/man]
361 This means that if you use any of `@datadir@', `@infodir@', or
362 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
363 defined in this file. As a temporary measure, if any of those are
364 found but no mention of `datarootdir', the substitutions will be
365 replaced with values that do not contain `${datarootdir}', and a
366 warning will be issued.
368 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
369 a trailing slash. Similar change will be made to ac_top_builddir in a
370 future release; the old style value, which matches (../)*, is (and will
371 continue to be) available as ac_top_build_prefix.
374 New macro to check for support of 'typeof' syntax a la GNU C.
376 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
377 New "once-only" variants of commonly-used macros, to make 'configure'
378 smaller and faster in common cases.
381 New macro to check for strtold with C99 semantics.
384 New macro that lets builder disable assertions at 'configure'-time.
387 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
388 X11/Intrinsic.h and XtMalloc (Xt).
390 ** AC_PRESERVE_HELP_ORDER
391 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
392 and AC_ARG_WITH arguments in one region, in the order defined. The default
393 behavior is to group options of each classes separately.
395 ** AC_PROG_CC, AC_PROG_CXX
396 No longer automatically arrange to declare the 'exit' function of C,
397 when a C++ compiler is used. Standard Autoconf macros no longer use
398 'exit', so this is no longer an issue for them. If you use C++, and
399 want to call 'exit', you'll have to arrange for its declaration
400 yourself. But we now suggest you return from 'main' instead.
402 ** AC_PROG_CC_C89, AC_PROG_CC_C99
403 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
404 check for ANSI C89 and ISO C99 support respectively.
407 Has been unobsoleted, and will check if the compiler supports ISO
408 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
409 retained for backwards compatibility, assuming the value of
410 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
413 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
414 New macros for checking commonly-used members of struct dirent.
417 The substituted value can now contain newlines.
420 The substitution now occurs only when @variable@ is on a line by itself,
421 optionally surrounded by spaces and tabs. The whole line is replaced.
423 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
424 New macros to check for long double, and whether it is wider than double.
425 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
426 applications should switch to the new macro.
428 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
429 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
430 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
431 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
432 New macros to check for C99 and POSIX types.
434 ** AC_USE_SYSTEM_EXTENSIONS
435 New macro to enable extensions to Posix.
438 New macro which is defined to the name of the first declared config header
439 or undefined if no config headers have been declared yet.
442 The macro correctly handles quadrigraphs now.
444 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
445 These macros are new or published now.
448 New macro for copyright notices in testsuite files.
450 ** ALLOCA, LIBOBJS, LTLIBOBJS
451 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
452 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
453 `Makefile.in' in case the object files lie in a different directory.
454 The LIBOBJDIR feature is experimental.
457 Supports --no-recursive now.
459 ** New macros to support Erlang/OTP.
460 New macros for configuring paths to Erlang tools and libraries:
461 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
462 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
463 AC_ERLANG_SUBST_LIB_DIR.
465 New macros for configuring installation of Erlang libraries:
466 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
468 ** The manual now mentions Gnulib more prominently.
470 ** New macros to support Objective C.
471 AC_PROG_OBJC, AC_PROG_OBJCPP.
473 * Major changes in Autoconf 2.59b
475 Released 2004-08-20, by Paul Eggert.
478 New macro that computes the default alignment of a type.
480 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
481 When cross-compiling, these macros will give a warning if the tool
482 is not prefixed. In the future, unprefixed cross tools will not
483 be detected; please consult the info documentation for information
484 about the reason of this change.
486 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
487 New macros that detect programs whose name is prefixed with the
488 target type, if the build type and target type are different.
490 ** AC_REQUIRE_AUX_FILE
491 New trace macro that declares expected auxiliary files.
494 New macro that tests for a grep program that accepts as a long a line
497 ** AC_PROG_EGREP, AC_PROG_FGREP
498 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
499 FGREP="$GREP -F" respectively if possible, or else run a path search for
500 a program that accepts as long a line as possible.
503 New macro that tests for a sed program that truncates as few characters
506 * Major changes in Autoconf 2.59
508 Released 2003-11-04, by Akim Demaille
510 ** ac_abs_builddir etc.
511 Absolute file names were actually relative in 2.58.
513 * Major changes in Autoconf 2.58
515 Released 2003-11-04, by Akim Demaille
518 core.* files are no longer removed, as they may be valid user files.
520 ** autoreconf and auxiliary directory
521 Autoreconf creates the auxiliary directory if needed. This is
522 especially useful for initial "bootstrapping" of fresh CVS checkouts.
524 ** AC_CONFIG_MACRO_DIR
525 Use this macro to declare the directory for local M4 macros for aclocal.
528 No longer includes twice the same file in LIBOBJS if invoked
531 ** AC_CONFIG_COMMANDS
532 The directory for its first argument is automatically created. For
535 AC_CONFIG_COMMANDS([src/modules.hh], [...])
537 $top_builddir/src/ is created if needed.
539 ** Autotest and local.at
540 The optional file local.at is always included in Autotest test suites.
543 The warnings are always issued, including with cached runs.
544 This became a significant problem since aclocal and automake can
545 run autoconf behind the scene.
547 ** autoheader warnings
548 The warnings of autoheader can be turned off, using --warning.
549 For instance, -Wno-obsolete disables the complaints about acconfig.h
550 and other deprecated constructs.
553 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
556 ** AC_DECL_SYS_SIGLIST
560 Now checks that mktime is the inverse of localtime.
562 ** Improve DJGPP portability
563 The Autoconf tools and configure behave better under DJGPP.
565 ** Present But Cannot Be Compiled
566 New FAQ section dedicated to the mystic
568 configure: WARNING: pi.h: present but cannot be compiled
569 configure: WARNING: pi.h: check for missing prerequisite headers?
570 configure: WARNING: pi.h: proceeding with the preprocessor's result
573 ** Concurrent executions of autom4te
574 autom4te now locks its internal files, which enables concurrent
575 executions of autom4te, likely to happen if automake, autoconf,
576 autoheader etc. are run simultaneously.
579 Use of Libtool 1.5 and higher is encouraged. Compatibility with
580 Libtool pre-1.4 is not checked.
583 Testsuites no longer rerun failed tests in verbose mode; instead,
584 failures are logged while the test is run.
586 In addition, expected failures can be marked as such.
588 * Major changes in Autoconf 2.57
590 Released 2002-12-03 by Paul Eggert.
592 Bug fixes for problems with AIX linker, with freestanding C compilers,
593 with GNU M4 limitations, and with obsolete copies of GNU documents.
595 The Free Documentation License has been upgraded from 1.1 to 1.2.
597 * Major changes in Autoconf 2.56
599 Released 2002-11-15 by Akim Demaille.
601 One packaging problem fixed (config/install-sh was not executable).
603 * Major changes in Autoconf 2.55
605 Released 2002-11-14 by Akim Demaille.
609 Have your configure.ac checked by autoscan ("autoscan").
610 Try the warning options ("autoreconf -fv -Wall").
614 - AC_CHECK_HEADER, AC_CHECK_HEADERS
615 More information on proper use.
617 - Writing Test Programs
619 This sections explains how to write good test sources to use with
620 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
622 - AC_FOO_IFELSE vs. AC_TRY_FOO
624 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
625 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
629 - Is more robust to different Gettext installations.
631 - Produces messages (when --verbose) to be understood by Emacs'
634 - Supports -W/--warnings.
637 Once the GNU Build System reinstalled, run `./config.status
638 --recheck && ./config.status && make' if possible.
642 - Supports --cache, and --no-cache.
644 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
645 (autom4te.cache). See `Customizing autom4te' in the documentation.
652 Support for the obsoleted options -m, --macrodir, -l, --localdir is
653 dropped in favor of the safer --include/--prepend-include scheme.
658 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
659 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
660 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
663 Obsoleted macros are kept for Autoconf backward compatibility, but
664 should be avoided in configure.ac. Running autoupdate is advised.
667 - AC_DEFINE/AC_DEFINE_UNQUOTED
669 We have to stop using the old compatibility scheme --that tried to
670 avoid useless backslashes-- because Libtool 1.4.3 contains a
672 AC_DEFINE([error_t], [int],
673 [Define to a type to use for \`error_t' if it is not
674 otherwise available.])
676 We have to quote the single quotes and backslashes with \. The old
677 compatibility scheme saw that ` was backslashed, and therefore did
678 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
679 compatible with Libtool. Autoconf 2.55 is, but in some cases might
680 produce more \ than wanted.
682 Please, note that in the future the same problem will happen with
683 AC_MSG_*: use `autoreconf -f -Wall'.
687 - Portability of the Autoconf package to Solaris.
689 - Spurious warnings caused by config.status.
690 This bug is benign, but painful: on some systems (typically
691 FreeBSD), warnings such as:
693 config.status: creating Makefile
694 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
696 could be issued. This is fixed.
699 Simultaneous executions of config.status are possible again.
701 - Precious variables accumulation
703 config.status could stack several copies of the precious variables
707 ** Plans for later versions
711 The compatibility hooks with the old scheme will be completely
712 removed. Please, advice/use `--build', `--host', and `--target'
715 - AC_CHECK_HEADER, AC_CHECK_HEADERS
717 The tests will be stricter, please make sure your invocations are
722 Shell functions will gradually be introduced, probably starting with
723 Autotest. If you know machines which are in use that you suspect
724 *not* to support shell functions, please run the test suite of
725 Autoconf 2.55 on it, and report the results to
726 bug-autoconf@gnu.org.
730 Special characters in AC_MSG_* need not be quoted. Currently,
731 Autoconf has heuristics to decide when a string is escaped, or has
732 to be escaped. This scheme is fragile, and will be removed; the
733 only risk is uglified messages. Please, run `autoreconf -f -Wall'
734 to find occurrences that will be affected.
736 * Major changes in Autoconf 2.54
738 Released 2002-09-13 by Akim Demaille.
742 - autoreconf no longer changes the version of the gettext/po/intl
743 support files. It now adds the files the correspond to the
744 AM_GNU_GETTEXT_VERSION declared in configure.ac.
746 Warning: It now relies on the 'autopoint' program, which is part
747 of GNU gettext 0.11.4 and newer.
749 Please note that you need to have a GNU gettext version that
750 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
751 in configure.ac. You can upgrade to newer GNU gettext versions,
752 though, without needing to change configure.ac.
754 - The -I DIR or --include=DIR option now appends DIR to the include path
755 instead of prepending; this is for consistency with other GNU tools.
756 The new -B DIR or --prepend-include=DIR option has the old behavior.
761 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
762 Please, remove lines such as
764 # This is necessary so that .o files in LIBOBJS are also
765 # built via the ANSI2KNR-filtering rules.
766 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
768 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
769 your Makefiles either.
771 - AC_CONFIG_LINKS now makes copies if it can't make links.
773 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
774 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
775 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
777 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
779 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
781 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
785 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
786 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
787 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
790 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
793 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
794 for an AC_LIBOBJ replacement.
798 - Spurious complaints from `m4_bmatch' about invalid regular
799 expressions are suppressed.
801 - Empty top_builddirs are properly handled.
803 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
806 Now colon in the optional path arguments are properly handled.
808 ** Improved portability
810 - Both Autoconf the package, and the scripts it produces, should run
811 more reliably with Zsh. Bear in mind it is the default Bourne shell
814 - Autoconf and the scripts it produces no longer assume the existence of
815 the obsolescent commands egrep and fgrep.
819 - Limitations of Make
823 The GNATS base moved to
824 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
825 (It is no longer available, though.)
830 Now contains the list of ouput variables and files (AC_SUBST,
833 * Major changes in Autoconf 2.53
835 Released 2002-03-08 by Akim Demaille.
839 Perl 5.005_03 or later is required: autom4te is written in Perl and is
840 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
846 Argument requirements, output variables, defined macros.
847 - M4sugar, M4sh, Autotest
849 - Double quoting macros
850 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
852 The Autoconf manual is now distributed under the terms of the GNU FDL.
853 - Section `Hosts and Cross-Compilation'
854 Explains the rationale for the 2.5x changes in the cross-compilation
855 chain, and in the relationships between build, host, and target
857 Emphasizes that `cross-compilation' == `--host is given'.
858 If you are working on compilers etc., be sure to read this section.
859 - Section `AC_LIBOBJ vs. LIBOBJS'
860 Explains why assigning LIBOBJS directly is now an error.
861 Details how to update the code.
866 Now used instead of hard coded line numbers.
867 This eases the comparison of `configure's, and diminishes the
868 pressure over control version archives.
869 Automatic replacement for shells that don't support this feature.
870 - New output variables
871 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
876 Autoconf and Autotest modes are provided.
881 New, used by the Autoconf suite to cache and speed up most processing.
883 Supported by autom4te, autoconf and autoheader.
885 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
886 autoupdate, and autoreconf.
888 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
889 automake options are to be given via AUTOMAKE_OPTIONS.
891 Runs gettextize and libtoolize when appropriate.
893 --m4dir is no longer supported.
895 Now runs only in the specified directories, defaulting to `.',
896 but understands AC_CONFIG_SUBDIRS for dependent directories.
897 Before, it used to run on all the `configure.ac' found in the
899 Independent packages are properly updated.
903 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
905 Under the user pressure, $? is finally available. Probably a mistake.
906 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
907 - Precious variables accumulation
908 config.status could stack several copies of the precious variables
910 - AC_PATH_PROG and family.
911 Works properly when given a literal path.
913 Somewhere since 2.13, the result had been reversed.
917 - AC_C_BIGENDIAN supports the cross-compiling case.
918 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
919 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
920 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
922 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
923 precision than `double'.
928 It now defines the preprocessor symbols PACKAGE_NAME,
929 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
933 Admits a fourth optional parameter: the tar name.
935 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
936 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
937 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
940 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
941 Are much less expensive when using long lists of files.
944 Works with shell variables, and non alphanumeric names.
948 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
949 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
951 - AC_FUNC_STRTOD substitutes POW_LIB.
956 * Major changes in Autoconf 2.52
958 Released 2001-07-18 by Akim Demaille.
963 This feature was present in autoconf 2.50 but was not documented.
964 For example, `@<:@' is translated to `[' just before output. This
965 is useful when writing strings that contain unbalanced quotes, or
966 other hard-to-quote constructs.
967 - m4_pattern_forbid, m4_pattern_allow
968 - Tips for upgrading from 2.13.
969 - Using autoscan to maintain a configure.ac.
972 - Now include stdint.h.
973 - sys/types.h and sys/stat.h are guarded.
974 - strings.h is included if available, and not conflicting with string.h.
977 - The test suite is more robust and presents less false failures.
978 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
979 - configure accepts --prefix='' again.
980 - AC_CHECK_LIB works properly when its first argument is not a
982 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
983 - build_, host_, and target_alias are AC_SUBST as in 2.13.
984 - AC_ARG_VAR properly propagates precious variables inherited from the
985 environment to ./config.status.
986 - Using --program-suffix/--program-prefix is portable.
987 - Failures to detect the default compiler's output extension are less
989 - `config.status foo' works properly when `foo' depends on variables
990 set in an AC_CONFIG_THING INIT-CMD.
991 - autoheader is more robust to broken input.
992 - Fixed Fortran name-mangling and link tests on a number of systems,
993 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
996 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
997 specify pre-includes. In this case, the headers are compiled with
998 cc, not merely preprocessed by cpp. Therefore it is the _usability_
999 of a header which is checked for, not just its availability.
1000 - AC_ARG_VAR refuses to run configure when precious variables have
1002 - Versions of compilers are dumped in the logs.
1003 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
1006 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
1007 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
1008 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
1009 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
1010 Be sure to read `Upgrading from Version 2.13' to understand why
1011 running `autoupdate' is needed.
1012 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
1013 a main-like routine is required/possible when linking C/C++ with
1014 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
1015 - AC_FUNC_GETPGRG behaves better when cross-compiling.
1017 * Major changes in Autoconf 2.51
1018 There was no release of Autoconf 2.51 since some packagers had used
1019 this version number without permission to ship intermediary versions
1020 of 2.50. The version was skipped to avoid confusion.
1022 * Major changes in Autoconf 2.50
1024 Released 2001-05-21 by Akim Demaille.
1026 ** Lots of bug fixes
1027 There have been far too many to enumerate them here. Check out
1028 ChangeLog if you really want to know more.
1030 ** Improved documentation
1031 In particular, portability issues are better covered.
1034 All the standard GNU Makefile targets are supported. The layout has
1035 changed: m4/ holds the M4 extensions Autoconf needs for its
1036 configuration, doc/ contains the documentation, and tests/ contains
1039 ** Man pages are provided
1040 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
1041 config.guess, config.sub.
1045 Provides a safe and powerful means to trace the macro uses. This
1046 provide the parsing layer for tools which need to `study'
1050 Specify what category of warnings should be enabled.
1052 - When recursing into subdirectories, try for configure.gnu before
1053 configure to adapt for packages not using autoconf on case-insensitive
1057 More errors are now caught (circular AC_REQUIRE dependencies,
1058 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
1059 etc.). In addition, their location and call stack are given.
1062 autoupdate is much more powerful, and is able to provide the glue code
1063 which might be needed to move from an old macro to its newer
1066 You are strongly encouraged to use it to modernize both your
1067 `configure.in' and your .m4 extension files.
1070 The internal machinery of autoheader has completely changed. As a
1071 result, using `acconfig.h' should be considered to be obsoleted, and
1072 you are encouraged to get rid of it using the AH macros.
1077 ** Fortran 77 compilers
1078 Globally, the support for Fortran 77 is considerably improved.
1080 Support for automatically determining a Fortran 77 compiler's
1081 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
1082 provided to wrap C/C++ identifiers, thus making it easier and more
1083 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
1084 call C/C++ routines. See the Texinfo documentation for details.
1087 The test suite no longer uses DejaGNU. It should be easy to submit
1088 test cases in this new framework.
1091 - --help, --help=long, -hl
1092 no longer dumps useless items.
1094 lists only specific options.
1095 - --help=recursive, -hr
1096 displays the help of all the embedded packages.
1097 - Remembers environment variables when reconfiguring.
1098 The previous scheme to set envvar before running configure was
1100 what prevented configure from remembering the environment in which
1101 it was run, therefore --recheck was run in an inconsistent
1102 environment. Now, one should run
1104 and then --recheck will work properly. Variables declared with
1105 AC_ARG_VAR are also preserved.
1107 $build defaults to `config.guess`, $host to $build, and then $target
1109 Cross-compilation is a global status of the package, it no longer
1110 depends upon the current language.
1111 Cross compilation is enabled iff the user specified `--host'.
1112 `configure' now fails if it can't run the executables it compiles,
1113 unless cross-compilation is enabled.
1115 The cache file is disabled by default. The new options
1116 `--config-cache', `-C' set the cache to `config.cache'.
1120 Much faster on most architectures.
1121 - concurrent executions
1122 It is safe to use `make -j' with config.status.
1123 - human interface improved
1124 It is possible to invoke
1125 ./config.status foobar
1126 instead of the former form (still valid)
1127 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
1128 CONFIG_FILES=foobar:foo.in:bar.in \
1130 The same holds for configuration headers and links.
1131 You can instantiate unknown files and headers:
1132 ./config.status --header foo.h:foo.h.in --file bar:baz
1133 - has a useful --help
1134 - accepts special file name "-" for stdin/stdout
1139 Specify additional copyright information.
1142 Now expects the identity of the package as argument.
1146 Most macros, if not all, now strictly follow the `one quotation
1147 level' rule. This results in a more predictable expansion.
1150 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
1151 configure scripts, was fixed by Axel Thimm.
1155 Document and ask for the registration of an envvar.
1158 Specifies the file which `configure' should look for when trying to
1159 find the source tree (used to be handled by AC_INIT).
1161 - AC_CONFIG_COMMANDS
1162 To add new actions to config.status. Should be used instead of
1166 Replaces AC_LINK_FILES.
1168 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
1169 AC_CONFIG_LINKS, and AC_CONFIG_FILES
1170 They now obey sh: you should no longer use shell variables as
1171 argument. Instead of
1173 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
1174 AC_CONFIG_SUBDIRS($my_subdirs)
1178 if test "$package_foo_enabled" = yes; then
1179 AC_CONFIG_SUBDIRS(foo)
1183 To format an Autoconf macro's help string so that it looks pretty
1184 when the user executes `configure --help'.
1187 ** Generic Test Macros
1189 The interface of the AC_CHECK families of macros (decl, header,
1190 type, member, func) is now uniform. They support the same set of
1193 - AC_CHECK_DECL, AC_CHECK_DECLS
1194 To check whether a symbol is declared.
1196 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
1197 No longer need a cross-compilation default.
1200 The test it performs is much more robust than previously, and makes
1201 it possible to test builtin types in addition to typedefs.
1202 It is now schizophrenic:
1203 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
1204 remains for backward compatibility, but its use is discouraged.
1205 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
1206 behaves exactly like the other AC_CHECK macros.
1209 Checks whether given types are supported by the system.
1211 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
1212 Check for given members in aggregates (e.g., pw_gecos in struct
1216 Checks if the compiler supports ISO C, included when needs special
1220 Checking whether the preprocessor indicates missing includes by the
1221 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1224 Takes a language as argument and replaces AC_LANG_C,
1225 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1227 - AC_LANG_PUSH, AC_LANG_POP
1228 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1231 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1232 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1233 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1237 Sets GETGROUPS_LIBS.
1239 - AC_FUNC_GETLOADAVG
1240 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1243 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1246 Arrange for large-file support.
1248 - AC_EXEEXT, AC_OBJEXT
1249 You are no longer expected to use them: their computation is
1250 performed by default.
1252 ** C++ compatibility
1253 Every macro has been revisited in order to support at best CC=c++.
1255 Major changes in Autoconf 2.14:
1256 There was no release of GNU Autoconf 2.14.
1258 Major changes in Autoconf 2.13:
1260 Released 1999-05-01 by Ben Elliston.
1262 * Support for building on Win32 systems where the only available C or
1263 C++ compiler is the Microsoft Visual C++ command line compiler
1264 (`cl'). Additional support for building on Win32 systems which are
1265 using the Cygwin or Mingw32 environments.
1266 * Support for alternative object file and executable file extensions.
1267 On Win32, for example, these are .obj and .exe. These are discovered
1268 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1269 @EXEEXT@ in the output, respectively.
1270 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1271 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1272 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1273 * AC_DEFINE now has an optional third argument for a description to be
1274 placed in the config header input file (e.g. config.h.in).
1275 * The C++ code fragment compiled for the C++ compiler test had to be
1276 improved to include an explicit return type for main(). This was
1277 causing failures on systems using recent versions of the EGCS C++
1279 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1280 script to report that `sometype_t' was present when only `type_t'
1282 * Merge of the FSF version of config.guess and config.sub to modernize
1283 these scripts. Add support for a few new hosts in config.guess.
1284 Incorporate latest versions of install-sh, mkinstalldirs and
1285 texinfo.tex from the FSF.
1286 * autoreconf is capable of running automake if necessary (and
1288 * Support for Fortran 77. See the Texinfo documentation for details.
1289 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1291 Major changes in Autoconf 2.12:
1293 Released 1996-11-26 by David J. MacKenzie
1295 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1296 concatenating multiple input files separated by colons, like so:
1297 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1298 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1299 The arguments may be shell variables, to compute the lists on the fly.
1300 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1301 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1304 Major changes in Autoconf 2.11:
1306 Released November 18th, 1996, by David J. MacKenzie
1308 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1309 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1310 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1311 * AC_CONFIG_HEADER expands shell variables in its argument.
1312 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1313 * The "checking..." messages and the source code for test programs that
1314 fail are saved in config.log.
1315 * Another workaround has been added for seds with small command length limits.
1316 * config.sub and config.guess recognize more system types.
1319 Major changes in Autoconf 2.10:
1321 Released May 7th, 1996, by Roland McGrath
1324 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1325 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1327 Major changes in Autoconf 2.9:
1329 Released March 16th, 1996, by Roland McGrath
1333 Major changes in Autoconf 2.8:
1335 Released March 8th, 1996, by Roland McGrath
1339 Major changes in Autoconf 2.7:
1341 Released November 22nd, 1995, by David J. MacKenzie
1345 Major changes in Autoconf 2.6:
1347 Released November 20th, 1995, by David J. MacKenzie
1351 Major changes in Autoconf 2.5:
1353 Released November 17th, 1995, by Roland McGrath
1355 * New configure options --bindir, --libdir, --datadir, etc., with
1356 corresponding output variables.
1357 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1358 * config.log contains the command being run as well as any output from it.
1359 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1360 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1361 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1362 AC_CHECK_TOOL can search a path other than $PATH.
1363 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1365 Major changes in Autoconf 2.4:
1367 Released June 14th, 1995, by David J. MacKenzie
1369 * Fix a few bugs found by Emacs testers.
1371 Major changes in Autoconf 2.3:
1373 Released March 27th, 1995, by David J. MacKenzie
1375 * Fix the cleanup trap in several ways.
1376 * Handle C compilers that are picky about option placement.
1377 * ifnames gets the version number from the right directory.
1379 Major changes in Autoconf 2.2:
1381 Released March 8th, 1995, by David J. MacKenzie
1383 * The ifnames utility is much faster but requires a "new awk" interpreter.
1384 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1385 library before existing libs, not after, in case it uses them.
1386 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1387 * Lots of bug fixes.
1388 * Many additions to the TODO file :-)
1390 Major changes in Autoconf 2.1:
1392 Released November 4th, 1994, by David J. MacKenzie
1395 * More explanations in the manual.
1396 * Fix a spurious failure in the testsuite.
1397 * Clarify some warning messages.
1398 * autoreconf by default only rebuilds configure and config.h.in files
1399 that are older than any of their particular input files; there is a
1400 --force option to use after installing a new version of Autoconf.
1402 Thanks to everybody who's submitted changes and additions to Autoconf!
1403 I've incorporated many of them, and am still considering others for
1404 future releases -- but I didn't want to postpone this release indefinitely.
1406 Caution: don't indiscriminately rebuild configure scripts with
1407 Autoconf version 2. Some configure.in files need minor adjustments to
1408 work with it; the documentation has a chapter on upgrading. A few
1409 configure.in files, including those for GNU Emacs and the GNU C
1410 Library, need major changes because they relied on undocumented
1411 internals of version 1. Future releases of those packages will have
1412 updated configure.in files.
1414 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1415 Autoconf now makes heavy use of M4 diversions, which were implemented
1416 inefficiently in GNU M4 releases before 1.3.
1418 Major changes in Autoconf 2.0:
1420 Released October 26th, 1994, by David J. MacKenzie
1422 ** New copyright terms:
1423 * There are no restrictions on distribution or use of configure scripts.
1426 * Autoconf manual is reorganized to make information easier to find
1427 and has several new indexes.
1428 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1431 * autoscan to generate a preliminary configure.in for a package by
1432 scanning its source code for commonly used nonportable functions,
1433 programs, and header files.
1434 * ifnames to list the symbols used in #if and #ifdef directives in a
1436 * autoupdate to update a configure.in to use the version 2 macro names.
1437 * autoreconf to recursively remake configure and configuration header
1438 files in a source tree.
1440 ** Changed utilities:
1441 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1442 * autoconf and autoheader can look for package-local definition files
1443 in an alternate directory.
1446 * AC_CACHE_VAL to share results of tests between configure runs.
1447 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1448 that macros invoked with AC_REQUIRE don't interrupt other macros.
1449 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1450 support deciding unguessable features based on the host and target types.
1451 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1452 * AC_ARG_PROGRAM to use the options --program-prefix,
1453 --program-suffix, and --program-transform-name to change the names
1454 of programs being installed.
1455 * AC_PREFIX_DEFAULT to change the default installation prefix.
1456 * AC_TRY_COMPILE to compile a test program without linking it.
1457 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1458 * AC_CHECK_LIB to check for a particular function and library.
1459 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1460 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1461 * AC_SUBST_FILE to insert one file into another.
1462 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1463 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1464 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1465 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1468 * Many macros renamed systematically, but old names are accepted for
1469 backward compatibility.
1470 * AC_OUTPUT adds the "automatically generated" comment to
1471 non-Makefiles where it finds @configure_input@ in an input file, to
1472 support files with various comment syntaxes.
1473 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1474 files when they are not enclosed in @ signs.
1475 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1476 override the file name "config.status".
1477 * AC_OUTPUT takes an optional argument for passing variables from
1478 configure to config.status.
1479 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1480 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1481 CPPFLAGS, and LDFLAGS from the environment.
1482 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1483 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1484 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1485 srcdir/../.. by default.
1486 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1487 * AC_DEFINE no longer prints anything, because of the new result reporting
1488 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1489 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1490 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1491 --enable- and --with- options.
1492 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1493 execute on success or failure.
1494 * Checking for C functions in C++ works.
1497 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1498 better maintained with them.
1499 * AC_ARG_ARRAY removed because no one was likely using it.
1500 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1501 take arguments, for consistency with all of the other specific checks.
1504 * Comes with config.sub and config.guess, and uses them optionally.
1505 * Uses config.cache to cache test results. An alternate cache file
1506 can be selected with the --cache-file=FILE option.
1507 * Uses optional shell scripts $prefix/share/config.site and
1508 $prefix/etc/config.site to perform site or system specific initializations.
1509 * configure saves compiler output to ./config.log for debugging.
1510 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1511 * acsite.m4 is the new name for the system-wide aclocal.m4.
1512 * Has a DejaGnu test suite.
1514 Major changes in Autoconf 1.11:
1516 * AC_PROG_INSTALL calls install.sh with the -c option.
1517 * AC_SET_MAKE cleans up after itself.
1518 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1519 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1521 Plus a few other bug fixes.
1523 Major changes in Autoconf 1.10:
1525 * autoheader uses config.h.bot if present, analogous to config.h.top.
1526 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1528 * AC_PROG_CXX looks for cxx as a C++ compiler.
1530 Plus several bugs fixed.
1532 Major changes in Autoconf 1.9:
1534 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1535 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1536 and autoheader generates entries for those names automatically.
1537 * AC_FIND_X gets the result from xmkmf correctly.
1538 * AC_FIND_X assumes no X if --without-x was given.
1539 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1540 * AC_PROG_INSTALL finds OSF/1 installbsd.
1542 Major changes in Autoconf 1.8:
1545 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1546 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1547 for checking both C++ and C features in one configure script.
1548 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1549 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1550 AC_SET_MAKE, AC_ENABLE.
1553 * AC_FIND_X looks for X in more places.
1554 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1555 install.sh is distributed with Autoconf.
1556 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1557 a rewrite of quoting in AC_DEFINE.
1558 * AC_OUTPUT adds its comments in C format when substituting in C files.
1559 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1561 ** New or changed command line options:
1562 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1563 * configure accepts --without-PACKAGE, which sets withval=no.
1564 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1565 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1566 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1567 * configure accepts and ignores most other Cygnus configure options, and
1568 warns about unknown options.
1569 * config.status accepts --help, --version options.
1571 ** File names and other changes:
1572 * Relative srcdir values are not made absolute.
1573 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1574 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1575 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1576 * The example Makefile dependencies for configure et al. work better.
1577 * Namespace cleanup: all shell variables used internally by Autoconf
1578 have names beginning with `ac_'.
1580 More big improvements are in process for future releases, but have not
1581 yet been (variously) finished, integrated, tested, or documented enough
1584 Major changes in Autoconf 1.7:
1586 * New macro AC_OBSOLETE.
1587 * Bugs in Makefile.in fixed.
1588 * AC_LONG_FILE_NAMES improved.
1590 Major changes in Autoconf 1.6:
1592 * New macro AC_LONG_64_BITS.
1593 * Multiple .h files can be created.
1594 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1595 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1596 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1597 * Unused --no-create option to configure removed.
1598 * autoheader doesn't change the timestamp of its output file if
1599 the file didn't change.
1600 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1601 * config.status checks three optional environment variables to
1602 modify its behavior.
1603 * The usual bug fixes.
1605 Major changes in Autoconf 1.5:
1607 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1608 * autoconf and autoheader scripts have GNU standards conforming
1609 --version and --help options (they print their message and exit).
1612 Major changes in Autoconf 1.4:
1614 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1615 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1616 * autoconf and autoheader use the M4 environment variable to determine the
1617 name of the M4 program to use.
1618 * The --macrodir option to autoconf and autoheader specifies the directory
1619 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1620 * autoconf and autoheader can take `-' as their file names, which means to
1621 read stdin as input.
1622 * Resulting configure scripts can take a --verbose option which causes them
1623 to print the results of their tests.
1624 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1625 shell characters, etc. will be preserved during various stages of
1626 expansion done by the shell. If you don't want this, use
1627 AC_DEFINE_UNQUOTED instead.
1628 * Much textual processing done with external calls to tr and sed have been
1629 internalized with builtin M4 `patsubst' and `translit' calls.
1630 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1631 set the shell variables `gen_files' and `gen_config' to the list of
1632 file names to output.
1633 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1634 "lex.yy" or "lexyy", depending on the system.
1635 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1637 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1638 * AC_CONST works much more reliably on more systems.
1641 Major changes in Autoconf 1.3:
1643 configure no longer requires awk for packages that use a config.h.
1644 Support handling --with-PACKAGE options.
1645 New `autoheader' script to create `config.h.in' from `configure.in'.
1646 Ignore troublesome -lucb and -lPW when searching for alloca.
1647 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1648 Improve detection of STDC library.
1649 Add AC_HAVE_LIBRARY to check for non-default libraries.
1650 Function checking should work with future GNU libc releases.
1652 Major changes in Autoconf 1.2:
1654 The --srcdir option is now usually unnecessary.
1655 Add a file containing sample comments describing CPP macros.
1656 A comment in config.status tells which host it was configured on.
1657 Substituted variable values can now contain commas.
1658 Fix bugs in various feature checks.
1660 Major changes in Autoconf 1.1:
1662 Added AC_STRCOLL macro.
1663 Made AC_GETLOADAVG check for more things.
1664 AC_OUTPUT argument is now optional.
1669 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1670 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
1672 This program is free software: you can redistribute it and/or modify
1673 it under the terms of the GNU General Public License as published by
1674 the Free Software Foundation, either version 3 of the License, or
1675 (at your option) any later version.
1677 This program is distributed in the hope that it will be useful,
1678 but WITHOUT ANY WARRANTY; without even the implied warranty of
1679 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1680 GNU General Public License for more details.
1682 You should have received a copy of the GNU General Public License
1683 along with this program. If not, see <http://www.gnu.org/licenses/>.