1 # This file is part of Autoconf. -*- Autoconf -*-
2 # Macros that test for specific, unclassified, features.
4 # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
5 # 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 # As a special exception, the Free Software Foundation gives unlimited
23 # permission to copy, distribute and modify the configure scripts that
24 # are the output of Autoconf. You need not follow the terms of the GNU
25 # General Public License when using or distributing such scripts, even
26 # though portions of the text of Autoconf appear in them. The GNU
27 # General Public License (GPL) does govern all other use of the material
28 # that constitutes the Autoconf program.
30 # Certain portions of the Autoconf source text are designed to be copied
31 # (in certain cases, depending on the input) into the output of
32 # Autoconf. We call these the "data" portions. The rest of the Autoconf
33 # source text consists of comments plus executable code that decides which
34 # of the data portions to output in any given case. We call these
35 # comments and executable code the "non-data" portions. Autoconf never
36 # copies any of the non-data portions into its output.
38 # This special exception to the GPL applies to versions of Autoconf
39 # released by the Free Software Foundation. When you make and
40 # distribute a modified version of Autoconf, you may extend this special
41 # exception to the GPL to apply to your modified version as well, *unless*
42 # your modified version has the potential to copy into its output some
43 # of the text that was the non-data portion of the version that you started
44 # with. (In other words, unless your change moves or copies text from
45 # the non-data portions to the data portions.) If your modification has
46 # such potential, you must delete any notice of this special exception
47 # to the GPL from your modified version.
49 # Written by David MacKenzie, with help from
50 # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
51 # Roland McGrath, Noah Friedman, david d zuhn, and many others.
54 ## ------------------------- ##
55 ## Checks for declarations. ##
56 ## ------------------------- ##
61 AN_IDENTIFIER([sys_siglist], [AC_CHECK_DECLS([sys_siglist])])
62 AU_DEFUN([AC_DECL_SYS_SIGLIST],
63 [AC_CHECK_DECLS([sys_siglist],,,
65 /* NetBSD declares sys_siglist in unistd.h. */
70 ])# AC_DECL_SYS_SIGLIST
75 ## -------------------------------------- ##
76 ## Checks for operating system services. ##
77 ## -------------------------------------- ##
82 AC_DEFUN([AC_SYS_INTERPRETER],
83 [AC_CACHE_CHECK(whether @%:@! works in shell scripts, ac_cv_sys_interpreter,
88 (SHELL=/bin/sh; export SHELL; ./conftest >/dev/null 2>&1)
89 if test $? -ne 69; then
90 ac_cv_sys_interpreter=yes
92 ac_cv_sys_interpreter=no
95 interpval=$ac_cv_sys_interpreter
99 AU_DEFUN([AC_HAVE_POUNDBANG],
100 [AC_SYS_INTERPRETER],
101 [Remove this warning when you adjust your code to use
102 `AC_SYS_INTERPRETER'.])
105 AU_DEFUN([AC_ARG_ARRAY], [],
106 [$0 is no longer implemented: don't do unportable things
107 with arguments. Remove this warning when you adjust your code.])
110 # _AC_SYS_LARGEFILE_TEST_INCLUDES
111 # -------------------------------
112 m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
113 [@%:@include <sys/types.h>
114 /* Check that off_t can represent 2**63 - 1 correctly.
115 We can't simply define LARGE_OFF_T to be 9223372036854775807,
116 since some C++ compilers masquerading as C compilers
117 incorrectly reject 9223372036854775807. */
118 @%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
119 int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
120 && LARGE_OFF_T % 2147483647 == 1)
125 # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
128 # PROLOGUE, [FUNCTION-BODY])
129 # ----------------------------------------------------------
130 m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
131 [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
133 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
134 [AC_LANG_PROGRAM([$5], [$6])],
136 m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
137 [AC_LANG_PROGRAM([@%:@define $1 $2
145 *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
148 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
153 # By default, many hosts won't let programs access large files;
154 # one must use special compiler options to get large-file access to work.
155 # For more details about this brain damage please see:
156 # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
157 AC_DEFUN([AC_SYS_LARGEFILE],
158 [AC_ARG_ENABLE(largefile,
159 [ --disable-largefile omit support for large files])
160 if test "$enable_largefile" != no; then
162 AC_CACHE_CHECK([for special C compiler options needed for large files],
163 ac_cv_sys_largefile_CC,
164 [ac_cv_sys_largefile_CC=no
165 if test "$GCC" != yes; then
168 # IRIX 6.2 and later do not support large files by default,
169 # so use the C compiler's -n32 option if that helps.
170 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
171 AC_COMPILE_IFELSE([], [break])
173 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
177 rm -f conftest.$ac_ext
179 if test "$ac_cv_sys_largefile_CC" != no; then
180 CC=$CC$ac_cv_sys_largefile_CC
183 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
184 ac_cv_sys_file_offset_bits,
185 [Number of bits in a file offset, on hosts where this is settable.],
186 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
187 if test $ac_cv_sys_file_offset_bits = unknown; then
188 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
189 ac_cv_sys_large_files,
190 [Define for large files, on AIX-style hosts.],
191 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
197 # AC_SYS_LONG_FILE_NAMES
198 # ----------------------
199 # Security: use a temporary directory as the most portable way of
200 # creating files in /tmp securely. Removing them leaves a race
201 # condition, set -C is not portably guaranteed to use O_EXCL, so still
202 # leaves a race, and not all systems have the `mktemp' utility. We
203 # still test for existence first in case of broken systems where the
204 # mkdir succeeds even when the directory exists. Broken systems may
205 # retain a race, but they probably have other security problems
206 # anyway; this should be secure on well-behaved systems. In any case,
207 # use of `mktemp' is probably inappropriate here since it would fail in
208 # attempting to create different file names differing after the 14th
209 # character on file systems without long file names.
210 AC_DEFUN([AC_SYS_LONG_FILE_NAMES],
211 [AC_CACHE_CHECK(for long file names, ac_cv_sys_long_file_names,
212 [ac_cv_sys_long_file_names=yes
213 # Test for long file names in all the places we know might matter:
214 # . the current directory, where building will happen
215 # $prefix/lib where we will be installing things
216 # $exec_prefix/lib likewise
217 # $TMPDIR if set, where it might want to write temporary files
218 # /tmp where it might want to write temporary files
221 for ac_dir in . "$TMPDIR" /tmp /var/tmp /usr/tmp "$prefix/lib" "$exec_prefix/lib"; do
222 # Skip $TMPDIR if it is empty or bogus, and skip $exec_prefix/lib
223 # in the usual case where exec_prefix is '${prefix}'.
225 . | /* | ?:[[\\/]]*) ;; #(
228 test -w "$ac_dir/." || continue # It is less confusing to not echo anything here.
230 (umask 077 && mkdir "$ac_xdir" 2>/dev/null) || continue
231 ac_tf1=$ac_xdir/conftest9012345
232 ac_tf2=$ac_xdir/conftest9012346
233 touch "$ac_tf1" 2>/dev/null && test -f "$ac_tf1" && test ! -f "$ac_tf2" ||
234 ac_cv_sys_long_file_names=no
235 rm -f -r "$ac_xdir" 2>/dev/null
236 test $ac_cv_sys_long_file_names = no && break
238 if test $ac_cv_sys_long_file_names = yes; then
239 AC_DEFINE(HAVE_LONG_FILE_NAMES, 1,
240 [Define to 1 if you support file names longer than 14 characters.])
245 # AC_SYS_RESTARTABLE_SYSCALLS
246 # ---------------------------
247 # If the system automatically restarts a system call that is
248 # interrupted by a signal, define `HAVE_RESTARTABLE_SYSCALLS'.
249 AC_DEFUN([AC_SYS_RESTARTABLE_SYSCALLS],
250 [AC_DIAGNOSE([obsolete],
251 [$0: AC_SYS_RESTARTABLE_SYSCALLS is useful only when supporting very
252 old systems that lack `sigaction' and `SA_RESTART'. Don't bother with
253 this macro unless you need to support very old systems like 4.2BSD and
255 AC_REQUIRE([AC_HEADER_SYS_WAIT])dnl
256 AC_CACHE_CHECK(for restartable system calls, ac_cv_sys_restartable_syscalls,
257 [AC_RUN_IFELSE([AC_LANG_SOURCE(
258 [/* Exit 0 (true) if wait returns something other than -1,
259 i.e. the pid of the child, which means that wait was restarted
260 after getting the signal. */
264 #ifdef HAVE_SYS_WAIT_H
265 # include <sys/wait.h>
268 /* Some platforms explicitly require an extern "C" signal handler
271 extern "C" void ucatch (int dummy) { }
273 void ucatch (dummy) int dummy; { }
279 int i = fork (), status;
284 kill (getppid (), SIGINT);
289 signal (SIGINT, ucatch);
297 [ac_cv_sys_restartable_syscalls=yes],
298 [ac_cv_sys_restartable_syscalls=no])])
299 if test $ac_cv_sys_restartable_syscalls = yes; then
300 AC_DEFINE(HAVE_RESTARTABLE_SYSCALLS, 1,
301 [Define to 1 if system calls automatically restart after
302 interruption by a signal.])
304 ])# AC_SYS_RESTARTABLE_SYSCALLS
307 # AC_SYS_POSIX_TERMIOS
308 # --------------------
309 AC_DEFUN([AC_SYS_POSIX_TERMIOS],
310 [AC_CACHE_CHECK([POSIX termios], ac_cv_sys_posix_termios,
311 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
315 [/* SunOS 4.0.3 has termios.h but not the library calls. */
317 ac_cv_sys_posix_termios=yes,
318 ac_cv_sys_posix_termios=no)])
319 ])# AC_SYS_POSIX_TERMIOS
324 ## ------------------------------------ ##
325 ## Checks for not-quite-Unix variants. ##
326 ## ------------------------------------ ##
331 AC_DEFUN([AC_GNU_SOURCE],
332 [AH_VERBATIM([_GNU_SOURCE],
333 [/* Enable GNU extensions on systems that have them. */
337 AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
338 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
339 AC_DEFINE([_GNU_SOURCE])
345 # Check for Cygwin. This is a way to set the right value for
347 AU_DEFUN([AC_CYGWIN],
350 *cygwin* ) CYGWIN=yes;;
353 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
354 matches *cygwin*])# AC_CYGWIN
359 # Check for EMX on OS/2. This is another way to set the right value
361 AU_DEFUN([AC_EMXOS2],
367 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
368 matches *emx*])# AC_EMXOS2
373 # Check for mingw32. This is another way to set the right value for
375 AU_DEFUN([AC_MINGW32],
378 *mingw32* ) MINGW32=yes;;
381 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
382 matches *mingw32*])# AC_MINGW32
385 # AC_USE_SYSTEM_EXTENSIONS
386 # ------------------------
387 # Enable extensions on systems that normally disable them,
388 # typically due to standards-conformance issues.
389 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
391 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
392 AC_BEFORE([$0], [AC_RUN_IFELSE])
394 AC_REQUIRE([AC_GNU_SOURCE])
396 AC_REQUIRE([AC_MINIX])
398 AH_VERBATIM([__EXTENSIONS__],
399 [/* Enable extensions on Solaris. */
400 #ifndef __EXTENSIONS__
401 # undef __EXTENSIONS__
403 #ifndef _POSIX_PTHREAD_SEMANTICS
404 # undef _POSIX_PTHREAD_SEMANTICS
406 #ifndef _TANDEM_SOURCE
407 # undef _TANDEM_SOURCE
409 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
410 [ac_cv_safe_to_define___extensions__],
413 # define __EXTENSIONS__ 1
414 AC_INCLUDES_DEFAULT])],
415 [ac_cv_safe_to_define___extensions__=yes],
416 [ac_cv_safe_to_define___extensions__=no])])
417 test $ac_cv_safe_to_define___extensions__ = yes &&
418 AC_DEFINE([__EXTENSIONS__])
419 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
420 AC_DEFINE([_TANDEM_SOURCE])
426 ## -------------------------- ##
427 ## Checks for UNIX variants. ##
428 ## -------------------------- ##
431 # These are kludges which should be replaced by a single POSIX check.
432 # They aren't cached, to discourage their use.
437 [AH_VERBATIM([_ALL_SOURCE],
438 [/* Define to 1 if on AIX 3.
439 System headers sometimes define this.
440 We just want to avoid a redefinition error message. */
441 @%:@ifndef _ALL_SOURCE
442 @%:@ undef _ALL_SOURCE
444 AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
445 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
446 AC_MSG_CHECKING([for AIX])
452 [AC_MSG_RESULT([yes])
453 AC_DEFINE(_ALL_SOURCE)],
454 [AC_MSG_RESULT([no])])
461 [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
462 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
463 AC_CHECK_HEADER(minix/config.h, MINIX=yes, MINIX=)
464 if test "$MINIX" = yes; then
465 AC_DEFINE(_POSIX_SOURCE, 1,
466 [Define to 1 if you need to in order for `stat' and other things to
468 AC_DEFINE(_POSIX_1_SOURCE, 2,
469 [Define to 2 if the system does not provide POSIX.1 features except
472 [Define to 1 if on MINIX.])
479 AC_DEFUN([AC_ISC_POSIX], [AC_SEARCH_LIBS(strerror, cposix)])
484 AU_DEFUN([AC_XENIX_DIR],
485 [AC_MSG_CHECKING([for Xenix])
487 [#if defined M_XENIX && ! defined M_UNIX
490 [AC_MSG_RESULT([yes]); XENIX=yes],
491 [AC_MSG_RESULT([no]); XENIX=])
493 AC_HEADER_DIRENT[]dnl
495 [You shouldn't need to depend upon XENIX. Remove the
496 `AC_MSG_CHECKING', `AC_EGREP_CPP', and this warning if this part
497 of the test is useless.])
502 AU_DEFUN([AC_DYNIX_SEQ], [AC_FUNC_GETMNTENT])
507 AU_DEFUN([AC_IRIX_SUN],
509 AC_CHECK_LIB(sun, getpwnam)])
514 AU_DEFUN([AC_SCO_INTL], [AC_FUNC_STRFTIME])