1 * Major changes in Autoconf 2.52 -*- outline -*-
5 This feature was present in autoconf 2.50 but was not documented.
6 For example, `@<:@' is translated to `[' just before output. This
7 is useful when writing strings that contain unbalanced quotes, or
8 other hard-to-quote constructs.
9 - m4_pattern_forbid, m4_pattern_allow
10 - Tips for upgrading from 2.13.
11 - Using autoscan to maintain a configure.ac.
14 - Now include stdint.h.
15 - sys/types.h and sys/stat.h are guarded.
16 - strings.h is included if available, and not conflicting with string.h.
19 - The test suite is more robust and presents less false failures.
20 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
21 - configure accepts --prefix='' again.
22 - AC_CHECK_LIB works properly when its first argument is not a
24 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
25 - build_, host_, and target_alias are AC_SUBST as in 2.13.
26 - AC_ARG_VAR properly propagates precious variables inherited from the
27 environment to ./config.status.
28 - Using --program-suffix/--program-prefix is portable.
29 - Failures to detect the default compiler's output extension are less
31 - `config.status foo' works properly when `foo' depends on variables
32 set in an AC_CONFIG_THING INIT-CMD.
33 - autoheader is more robust to broken input.
34 - Fixed Fortran name-mangling and link tests on a number of systems,
35 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
38 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
39 specify pre-includes. In this case, the headers are compiled with
40 cc, not merely preprocessed by cpp. Therefore it is the _usability_
41 of a header which is checked for, not just its availability.
42 - AC_ARG_VAR refuses to run configure when precious variables have
44 - Versions of compilers are dumped in the logs.
45 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
48 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
49 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
50 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
51 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
52 Be sure to read `Upgrading from Version 2.13' to understand why
53 running `autoupdate' is needed.
54 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
55 a main-like routine is required/possible when linking C/C++ with
56 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
57 - AC_FUNC_GETPGRG behaves better when cross-compiling.
59 * Major changes in Autoconf 2.50
62 There have been far too many to enumerate them here. Check out
63 ChangeLog if you really want to know more.
65 ** Improved documentation
66 In particular, portability issues are better covered.
69 All the standard GNU Makefile targets are supported. The layout has
70 changed: m4/ holds the m4 extensions Autoconf needs for its
71 configuration, doc/ contains the documentation, and tests/ contains
74 ** Man pages are provided
75 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
76 config.guess, config.sub.
80 Provides a safe and powerful means to trace the macro uses. This
81 provide the parsing layer for tools which need to `study'
85 Specify what category of warnings should be enabled.
87 - When recursing into subdirectories, try for configure.gnu before
88 configure to adapt for packages not using autoconf on case-insensitive
92 More errors are now caught (circular AC_REQUIRE dependencies,
93 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
94 etc.). In addition, their location and call stack are given.
97 autoupdate is much more powerful, and is able to provide the glue code
98 which might be needed to move from an old macro to its newer
101 You are strongly encouraged to use it to modernize both your
102 `configure.in' and your .m4 extension files.
105 The internal machinery of autoheader has completely changed. As a
106 result, using `acconfig.h' should be considered to be obsoleted, and
107 you are encouraged to get rid of it using the AH macros.
112 ** Fortran 77 compilers
113 Globally, the support for Fortran 77 is considerably improved.
115 Support for automatically determining a Fortran 77 compiler's
116 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
117 provided to wrap C/C++ identifiers, thus making it easier and more
118 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
119 call C/C++ routines. See the Texinfo documentation for details.
122 The test suite no longer uses DejaGNU. It should be easy to submit
123 test cases in this new framework.
126 - --help, --help=long, -hl
127 no longer dumps useless items.
129 lists only specific options.
130 - --help=recursive, -hr
131 displays the help of all the embedded packages.
132 - Remembers environment variables when reconfiguring.
133 The previous scheme to set envvar before running configure was
135 what prevented configure from remembering the environment in which
136 it was run, therefore --recheck was run in an inconsistent
137 environment. Now, one should run
139 and then --recheck will work properly. Variables declared with
140 AC_ARG_VAR are also preserved.
142 $build defaults to `config.guess`, $host to $build, and then $target
144 Cross-compilation is a global status of the package, it no longer
145 depends upon the current language.
146 Cross compilation is enabled iff the user specified `--host'.
147 `configure' now fails if it can't run the executables it compiles,
148 unless cross-compilation is enabled.
150 The cache file is disabled by default. The new options
151 `--config-cache', `-C' set the cache to `config.cache'.
155 Much faster on most architectures.
156 - concurrent executions
157 It is safe to use `make -j' with config.status.
158 - human interface improved
159 It is possible to invoke
160 ./config.status foobar
161 instead of the former form (still valid)
162 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
163 CONFIG_FILES=foobar:foo.in:bar.in \
165 The same holds for configuration headers and links.
166 You can instantiate unknown files and headers:
167 ./config.status --header foo.h:foo.h.in --file bar:baz
168 - has a useful --help
169 - accepts special file name "-" for stdin/stdout
174 Specify additional copyright information.
177 Now expects the identity of the package as argument.
181 Most macros, if not all, now strictly follow the `one quotation
182 level' rule. This results in a more predictable expansion.
185 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
186 configure scripts, was fixed by Axel Thimm.
190 Document and ask for the registration of an envvar.
193 Specifies the file which `configure' should look for when trying to
194 find the source tree (used to be handled by AC_INIT).
197 To add new actions to config.status. Should be used instead of
201 Replaces AC_LINK_FILES.
203 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
204 AC_CONFIG_LINKS, and AC_CONFIG_FILES
205 They now obey sh: you should no longer use shell variables as
208 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
209 AC_CONFIG_SUBDIRS($my_subdirs)
213 if test "$package_foo_enabled" = yes; then
214 AC_CONFIG_SUBDIRS(foo)
218 To format an Autoconf macro's help string so that it looks pretty
219 when the user executes `configure --help'.
222 ** Generic Test Macros
224 The interface of the AC_CHECK families of macros (decl, header,
225 type, member, func) is now uniform. They support the same set of
228 - AC_CHECK_DECL, AC_CHECK_DECLS
229 To check whether a symbol is declared.
231 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
232 No longer need a cross-compilation default.
235 The test it performs is much more robust than previously, and makes
236 it possible to test builtin types in addition to typedefs.
237 It is now schizophrenic:
238 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
239 remains for backward compatibility, but its use is discouraged.
240 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
241 behaves exactly like the other AC_CHECK macros.
244 Checks whether given types are supported by the system.
246 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
247 Check for given members in aggregates (e.g., pw_gecos in struct
251 Checks if the compiler supports ISO C, included when needs special
255 Checking whether the preprocessor indicates missing includes by the
256 error code. stderr is checked by AC_TRY_CPP only as a fallback.
259 Takes a language as argument and replaces AC_LANG_C,
260 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
262 - AC_LANG_PUSH, AC_LANG_POP
263 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
266 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
267 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
268 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
275 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
278 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
281 Arrange for large-file support.
283 - AC_EXEEXT, AC_OBJEXT
284 You are no longer expected to use them: their computation is
285 performed by default.
288 Every macro has been revisited in order to support at best CC=c++.
290 Major changes in Autoconf 2.14:
291 There was no release of GNU Autoconf 2.14.
293 Major changes in Autoconf 2.13:
295 * Support for building on Win32 systems where the only available C or
296 C++ compiler is the Microsoft Visual C++ command line compiler
297 (`cl'). Additional support for building on Win32 systems which are
298 using the Cygwin or Mingw32 environments.
299 * Support for alternative object file and executable file extensions.
300 On Win32, for example, these are .obj and .exe. These are discovered
301 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
302 @EXEEXT@ in the output, respectively.
303 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
304 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
305 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
306 * AC_DEFINE now has an optional third argument for a description to be
307 placed in the config header input file (e.g. config.h.in).
308 * The C++ code fragment compiled for the C++ compiler test had to be
309 improved to include an explicit return type for main(). This was
310 causing failures on systems using recent versions of the EGCS C++
312 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
313 script to report that `sometype_t' was present when only `type_t'
315 * Merge of the FSF version of config.guess and config.sub to modernise
316 these scripts. Add support for a few new hosts in config.guess.
317 Incorporate latest versions of install-sh, mkinstalldirs and
318 texinfo.tex from the FSF.
319 * autoreconf is capable of running automake if necessary (and
321 * Support for Fortran 77. See the Texinfo documentation for details.
322 * Bug fixes and workarounds for quirky bugs in vendor utilities.
324 Major changes in Autoconf 2.12:
326 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
327 concatenating multiple input files separated by colons, like so:
328 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
329 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
330 The arguments may be shell variables, to compute the lists on the fly.
331 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
332 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
335 Major changes in Autoconf 2.11:
337 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
338 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
339 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
340 * AC_CONFIG_HEADER expands shell variables in its argument.
341 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
342 * The "checking..." messages and the source code for test programs that
343 fail are saved in config.log.
344 * Another workaround has been added for seds with small command length limits.
345 * config.sub and config.guess recognize more system types.
348 Major changes in Autoconf 2.10:
351 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
352 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
354 Major changes in Autoconfs 2.6 through 2.9:
358 Major changes in Autoconf 2.5:
360 * New configure options --bindir, --libdir, --datadir, etc., with
361 corresponding output variables.
362 * New macro: AC_CACHE_CHECK, to make using the cache easier.
363 * config.log contains the command being run as well as any output from it.
364 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
365 * AC_PROG_INSTALL doesn't cache a path to install-sh, for sharing caches.
366 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
367 AC_CHECK_TOOL can search a path other than $PATH.
368 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
370 Major changes in Autoconf 2.4:
372 * Fix a few bugs found by Emacs testers.
374 Major changes in Autoconf 2.3:
376 * Fix the cleanup trap in several ways.
377 * Handle C compilers that are picky about option placement.
378 * ifnames gets the version number from the right directory.
380 Major changes in Autoconf 2.2:
382 * The ifnames utility is much faster but requires a "new awk" interpreter.
383 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
384 library before existing libs, not after, in case it uses them.
385 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
387 * Many additions to the TODO file :-)
389 Major changes in Autoconf 2.1:
392 * More explanations in the manual.
393 * Fix a spurious failure in the testsuite.
394 * Clarify some warning messages.
395 * autoreconf by default only rebuilds configure and config.h.in files
396 that are older than any of their particular input files; there is a
397 --force option to use after installing a new version of Autoconf.
399 Thanks to everybody who's submitted changes and additions to Autoconf!
400 I've incorporated many of them, and am still considering others for
401 future releases -- but I didn't want to postpone this release indefinitely.
403 Caution: don't indiscriminately rebuild configure scripts with
404 Autoconf version 2. Some configure.in files need minor adjustments to
405 work with it; the documentation has a chapter on upgrading. A few
406 configure.in files, including those for GNU Emacs and the GNU C
407 Library, need major changes because they relied on undocumented
408 internals of version 1. Future releases of those packages will have
409 updated configure.in files.
411 It's best to use GNU m4 1.3 (or later) with Autoconf version 2.
412 Autoconf now makes heavy use of m4 diversions, which were implemented
413 inefficiently in GNU m4 releases before 1.3.
415 Major changes in Autoconf 2.0:
417 ** New copyright terms:
418 * There are no restrictions on distribution or use of configure scripts.
421 * Autoconf manual is reorganized to make information easier to find
422 and has several new indexes.
423 * INSTALL is reorganized and clearer and is now made from Texinfo source.
426 * autoscan to generate a preliminary configure.in for a package by
427 scanning its source code for commonly used nonportable functions,
428 programs, and header files.
429 * ifnames to list the symbols used in #if and #ifdef directives in a
431 * autoupdate to update a configure.in to use the version 2 macro names.
432 * autoreconf to recursively remake configure and configuration header
433 files in a source tree.
435 ** Changed utilities:
436 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
437 * autoconf and autoheader can look for package-local definition files
438 in an alternate directory.
441 * AC_CACHE_VAL to share results of tests between configure runs.
442 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
443 that macros invoked with AC_REQUIRE don't interrupt other macros.
444 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
445 support deciding unguessable features based on the host and target types.
446 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
447 * AC_ARG_PROGRAM to use the options --program-prefix,
448 --program-suffix, and --program-transform-name to change the names
449 of programs being installed.
450 * AC_PREFIX_DEFAULT to change the default installation prefix.
451 * AC_TRY_COMPILE to compile a test program without linking it.
452 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
453 * AC_CHECK_LIB to check for a particular function and library.
454 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
455 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
456 * AC_SUBST_FILE to insert one file into another.
457 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
458 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
459 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
460 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
463 * Many macros renamed systematically, but old names are accepted for
464 backward compatibility.
465 * AC_OUTPUT adds the "automatically generated" comment to
466 non-Makefiles where it finds @configure_input@ in an input file, to
467 support files with various comment syntaxes.
468 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
469 files when they are not enclosed in @ signs.
470 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
471 override the file name "config.status".
472 * AC_OUTPUT takes an optional argument for passing variables from
473 configure to config.status.
474 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
475 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
476 CPPFLAGS, and LDFLAGS from the environment.
477 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
478 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
479 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
480 srcdir/../.. by default.
481 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
482 * AC_DEFINE no longer prints anything, because of the new result reporting
483 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
484 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
485 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
486 --enable- and --with- options.
487 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
488 execute on success or failure.
489 * Checking for C functions in C++ works.
492 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
493 better maintained with them.
494 * AC_ARG_ARRAY removed because no one was likely using it.
495 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
496 take arguments, for consistency with all of the other specific checks.
499 * Comes with config.sub and config.guess, and uses them optionally.
500 * Uses config.cache to cache test results. An alternate cache file
501 can be selected with the --cache-file=FILE option.
502 * Uses optional shell scripts $prefix/share/config.site and
503 $prefix/etc/config.site to perform site or system specific initializations.
504 * configure saves compiler output to ./config.log for debugging.
505 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
506 * acsite.m4 is the new name for the system-wide aclocal.m4.
507 * Has a DejaGnu test suite.
509 Major changes in Autoconf 1.11:
511 * AC_PROG_INSTALL calls install.sh with the -c option.
512 * AC_SET_MAKE cleans up after itself.
513 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
514 * AC_OUTPUT prevents shells from looking in PATH for config.status.
516 Plus a few other bug fixes.
518 Major changes in Autoconf 1.10:
520 * autoheader uses config.h.bot if present, analogous to config.h.top.
521 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
523 * AC_PROG_CXX looks for cxx as a C++ compiler.
525 Plus several bugs fixed.
527 Major changes in Autoconf 1.9:
529 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
530 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
531 and autoheader generates entries for those names automatically.
532 * AC_FIND_X gets the result from xmkmf correctly.
533 * AC_FIND_X assumes no X if --without-x was given.
534 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
535 * AC_PROG_INSTALL finds OSF/1 installbsd.
537 Major changes in Autoconf 1.8:
540 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
541 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
542 for checking both C++ and C features in one configure script.
543 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
544 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
545 AC_SET_MAKE, AC_ENABLE.
548 * AC_FIND_X looks for X in more places.
549 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
550 install.sh is distributed with Autoconf.
551 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
552 a rewrite of quoting in AC_DEFINE.
553 * AC_OUTPUT adds its comments in C format when substituting in C files.
554 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
556 ** New or changed command line options:
557 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
558 * configure accepts --without-PACKAGE, which sets withval=no.
559 * configure accepts --x-includes=DIR and --x-libraries=DIR.
560 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
561 * configure accepts --help, --version, --silent/--quiet, --no-create options.
562 * configure accepts and ignores most other Cygnus configure options, and
563 warns about unknown options.
564 * config.status accepts --help, --version options.
566 ** Paths and other changes:
567 * Relative srcdir values are not made absolute.
568 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
569 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
570 * autoheader optionally copies config.h.top to the beginning of config.h.in.
571 * The example Makefile dependencies for configure et al. work better.
572 * Namespace cleanup: all shell variables used internally by Autoconf
573 have names beginning with `ac_'.
575 More big improvements are in process for future releases, but have not
576 yet been (variously) finished, integrated, tested, or documented enough
579 Major changes in Autoconf 1.7:
581 * New macro AC_OBSOLETE.
582 * Bugs in Makefile.in fixed.
583 * AC_LONG_FILE_NAMES improved.
585 Major changes in Autoconf 1.6:
587 * New macro AC_LONG_64_BITS.
588 * Multiple .h files can be created.
589 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
590 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
591 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
592 * Unused --no-create option to configure removed.
593 * autoheader doesn't change the timestamp of its output file if
594 the file didn't change.
595 * All macros that look for libraries now use AC_HAVE_LIBRARY.
596 * config.status checks three optional environment variables to
598 * The usual bug fixes.
600 Major changes in Autoconf 1.5:
602 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
603 * autoconf and autoheader scripts have GNU standards conforming
604 --version and --help options (they print their message and exit).
607 Major changes in Autoconf 1.4:
609 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
610 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
611 * autoconf and autoheader use the M4 environment variable to determine the
612 path of the m4 program to use.
613 * The --macrodir option to autoconf and autoheader specifies the directory
614 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
615 * autoconf and autoheader can take `-' as their file names, which means to
617 * Resulting configure scripts can take a --verbose option which causes them
618 to print the results of their tests.
619 * AC_DEFINE quotes its second argument in such a way that spaces, magic
620 shell characters, etc. will be preserved during various stages of
621 expansion done by the shell. If you don't want this, use
622 AC_DEFINE_UNQUOTED instead.
623 * Much textual processing done with external calls to tr and sed have been
624 internalized with builtin m4 `patsubst' and `translit' calls.
625 * AC_OUTPUT doesn't hardwire the filenames it outputs. Instead, you can
626 set the shell variables `gen_files' and `gen_config' to the list of
628 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
629 "lex.yy" or "lexyy", depending on the system.
630 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
632 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
633 * AC_CONST works much more reliably on more systems.
636 Major changes in Autoconf 1.3:
638 configure no longer requires awk for packages that use a config.h.
639 Support handling --with-PACKAGE options.
640 New `autoheader' script to create `config.h.in' from `configure.in'.
641 Ignore troublesome -lucb and -lPW when searching for alloca.
642 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
643 Improve detection of STDC library.
644 Add AC_HAVE_LIBRARY to check for non-default libraries.
645 Function checking should work with future GNU libc releases.
647 Major changes in Autoconf 1.2:
649 The --srcdir option is now usually unnecessary.
650 Add a file containing sample comments describing CPP macros.
651 A comment in config.status tells which host it was configured on.
652 Substituted variable values can now contain commas.
653 Fix bugs in various feature checks.
655 Major changes in Autoconf 1.1:
657 Added AC_STRCOLL macro.
658 Made AC_GETLOADAVG check for more things.
659 AC_OUTPUT argument is now optional.