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 2, 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],
134 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
136 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@define $1 $2
141 if test "$$3" != no; then
142 AC_DEFINE_UNQUOTED([$1], [$$3], [$4])
145 ])# _AC_SYS_LARGEFILE_MACRO_VALUE
150 # By default, many hosts won't let programs access large files;
151 # one must use special compiler options to get large-file access to work.
152 # For more details about this brain damage please see:
153 # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
154 AC_DEFUN([AC_SYS_LARGEFILE],
155 [AC_ARG_ENABLE(largefile,
156 [ --disable-largefile omit support for large files])
157 if test "$enable_largefile" != no; then
159 AC_CACHE_CHECK([for special C compiler options needed for large files],
160 ac_cv_sys_largefile_CC,
161 [ac_cv_sys_largefile_CC=no
162 if test "$GCC" != yes; then
165 # IRIX 6.2 and later do not support large files by default,
166 # so use the C compiler's -n32 option if that helps.
167 AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
168 AC_COMPILE_IFELSE([], [break])
170 AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
174 rm -f conftest.$ac_ext
176 if test "$ac_cv_sys_largefile_CC" != no; then
177 CC=$CC$ac_cv_sys_largefile_CC
180 _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
181 ac_cv_sys_file_offset_bits,
182 [Number of bits in a file offset, on hosts where this is settable.],
183 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
184 _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
185 ac_cv_sys_large_files,
186 [Define for large files, on AIX-style hosts.],
187 [_AC_SYS_LARGEFILE_TEST_INCLUDES])
192 # AC_SYS_LONG_FILE_NAMES
193 # ----------------------
194 # Security: use a temporary directory as the most portable way of
195 # creating files in /tmp securely. Removing them leaves a race
196 # condition, set -C is not portably guaranteed to use O_EXCL, so still
197 # leaves a race, and not all systems have the `mktemp' utility. We
198 # still test for existence first in case of broken systems where the
199 # mkdir succeeds even when the directory exists. Broken systems may
200 # retain a race, but they probably have other security problems
201 # anyway; this should be secure on well-behaved systems. In any case,
202 # use of `mktemp' is probably inappropriate here since it would fail in
203 # attempting to create different file names differing after the 14th
204 # character on file systems without long file names.
205 AC_DEFUN([AC_SYS_LONG_FILE_NAMES],
206 [AC_CACHE_CHECK(for long file names, ac_cv_sys_long_file_names,
207 [ac_cv_sys_long_file_names=yes
208 # Test for long file names in all the places we know might matter:
209 # . the current directory, where building will happen
210 # $prefix/lib where we will be installing things
211 # $exec_prefix/lib likewise
212 # $TMPDIR if set, where it might want to write temporary files
213 # /tmp where it might want to write temporary files
216 for ac_dir in . "$TMPDIR" /tmp /var/tmp /usr/tmp "$prefix/lib" "$exec_prefix/lib"; do
217 # Skip $TMPDIR if it is empty or bogus, and skip $exec_prefix/lib
218 # in the usual case where exec_prefix is '${prefix}'.
220 . | /* | ?:[[\\/]]*) ;; #(
223 test -w "$ac_dir/." || continue # It is less confusing to not echo anything here.
225 (umask 077 && mkdir "$ac_xdir" 2>/dev/null) || continue
226 ac_tf1=$ac_xdir/conftest9012345
227 ac_tf2=$ac_xdir/conftest9012346
228 touch "$ac_tf1" 2>/dev/null && test -f "$ac_tf1" && test ! -f "$ac_tf2" ||
229 ac_cv_sys_long_file_names=no
230 rm -f -r "$ac_xdir" 2>/dev/null
231 test $ac_cv_sys_long_file_names = no && break
233 if test $ac_cv_sys_long_file_names = yes; then
234 AC_DEFINE(HAVE_LONG_FILE_NAMES, 1,
235 [Define to 1 if you support file names longer than 14 characters.])
240 # AC_SYS_RESTARTABLE_SYSCALLS
241 # ---------------------------
242 # If the system automatically restarts a system call that is
243 # interrupted by a signal, define `HAVE_RESTARTABLE_SYSCALLS'.
244 AC_DEFUN([AC_SYS_RESTARTABLE_SYSCALLS],
245 [AC_DIAGNOSE([obsolete],
246 [$0: AC_SYS_RESTARTABLE_SYSCALLS is useful only when supporting very
247 old systems that lack `sigaction' and `SA_RESTART'. Don't bother with
248 this macro unless you need to support very old systems like 4.2BSD and
250 AC_REQUIRE([AC_HEADER_SYS_WAIT])dnl
251 AC_CACHE_CHECK(for restartable system calls, ac_cv_sys_restartable_syscalls,
252 [AC_RUN_IFELSE([AC_LANG_SOURCE(
253 [/* Exit 0 (true) if wait returns something other than -1,
254 i.e. the pid of the child, which means that wait was restarted
255 after getting the signal. */
259 #ifdef HAVE_SYS_WAIT_H
260 # include <sys/wait.h>
263 /* Some platforms explicitly require an extern "C" signal handler
266 extern "C" void ucatch (int dummy) { }
268 void ucatch (dummy) int dummy; { }
274 int i = fork (), status;
279 kill (getppid (), SIGINT);
284 signal (SIGINT, ucatch);
292 [ac_cv_sys_restartable_syscalls=yes],
293 [ac_cv_sys_restartable_syscalls=no])])
294 if test $ac_cv_sys_restartable_syscalls = yes; then
295 AC_DEFINE(HAVE_RESTARTABLE_SYSCALLS, 1,
296 [Define to 1 if system calls automatically restart after
297 interruption by a signal.])
299 ])# AC_SYS_RESTARTABLE_SYSCALLS
302 # AC_SYS_POSIX_TERMIOS
303 # --------------------
304 AC_DEFUN([AC_SYS_POSIX_TERMIOS],
305 [AC_CACHE_CHECK([POSIX termios], ac_cv_sys_posix_termios,
306 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
310 [/* SunOS 4.0.3 has termios.h but not the library calls. */
312 ac_cv_sys_posix_termios=yes,
313 ac_cv_sys_posix_termios=no)])
314 ])# AC_SYS_POSIX_TERMIOS
319 ## ------------------------------------ ##
320 ## Checks for not-quite-Unix variants. ##
321 ## ------------------------------------ ##
326 AC_DEFUN([AC_GNU_SOURCE],
327 [AH_VERBATIM([_GNU_SOURCE],
328 [/* Enable GNU extensions on systems that have them. */
332 AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
333 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
334 AC_DEFINE([_GNU_SOURCE])
340 # Check for Cygwin. This is a way to set the right value for
342 AU_DEFUN([AC_CYGWIN],
345 *cygwin* ) CYGWIN=yes;;
348 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
349 matches *cygwin*])# AC_CYGWIN
354 # Check for EMX on OS/2. This is another way to set the right value
356 AU_DEFUN([AC_EMXOS2],
362 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
363 matches *emx*])# AC_EMXOS2
368 # Check for mingw32. This is another way to set the right value for
370 AU_DEFUN([AC_MINGW32],
373 *mingw32* ) MINGW32=yes;;
376 ], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
377 matches *mingw32*])# AC_MINGW32
380 # AC_USE_SYSTEM_EXTENSIONS
381 # ------------------------
382 # Enable extensions on systems that normally disable them,
383 # typically due to standards-conformance issues.
384 AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
386 AC_BEFORE([$0], [AC_COMPILE_IFELSE])
387 AC_BEFORE([$0], [AC_RUN_IFELSE])
389 AC_REQUIRE([AC_GNU_SOURCE])
391 AC_REQUIRE([AC_MINIX])
393 AH_VERBATIM([__EXTENSIONS__],
394 [/* Enable extensions on Solaris. */
395 #ifndef __EXTENSIONS__
396 # undef __EXTENSIONS__
398 #ifndef _POSIX_PTHREAD_SEMANTICS
399 # undef _POSIX_PTHREAD_SEMANTICS
401 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
402 [ac_cv_safe_to_define___extensions__],
405 # define __EXTENSIONS__ 1
406 AC_INCLUDES_DEFAULT])],
407 [ac_cv_safe_to_define___extensions__=yes],
408 [ac_cv_safe_to_define___extensions__=no])])
409 test $ac_cv_safe_to_define___extensions__ = yes &&
410 AC_DEFINE([__EXTENSIONS__])
411 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
417 ## -------------------------- ##
418 ## Checks for UNIX variants. ##
419 ## -------------------------- ##
422 # These are kludges which should be replaced by a single POSIX check.
423 # They aren't cached, to discourage their use.
428 [AH_VERBATIM([_ALL_SOURCE],
429 [/* Define to 1 if on AIX 3.
430 System headers sometimes define this.
431 We just want to avoid a redefinition error message. */
432 @%:@ifndef _ALL_SOURCE
433 @%:@ undef _ALL_SOURCE
435 AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
436 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
437 AC_MSG_CHECKING([for AIX])
443 [AC_MSG_RESULT([yes])
444 AC_DEFINE(_ALL_SOURCE)],
445 [AC_MSG_RESULT([no])])
452 [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
453 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
454 AC_CHECK_HEADER(minix/config.h, MINIX=yes, MINIX=)
455 if test "$MINIX" = yes; then
456 AC_DEFINE(_POSIX_SOURCE, 1,
457 [Define to 1 if you need to in order for `stat' and other things to
459 AC_DEFINE(_POSIX_1_SOURCE, 2,
460 [Define to 2 if the system does not provide POSIX.1 features except
463 [Define to 1 if on MINIX.])
470 AC_DEFUN([AC_ISC_POSIX], [AC_SEARCH_LIBS(strerror, cposix)])
475 AU_DEFUN([AC_XENIX_DIR],
476 [AC_MSG_CHECKING([for Xenix])
478 [#if defined M_XENIX && ! defined M_UNIX
481 [AC_MSG_RESULT([yes]); XENIX=yes],
482 [AC_MSG_RESULT([no]); XENIX=])
484 AC_HEADER_DIRENT[]dnl
486 [You shouldn't need to depend upon XENIX. Remove the
487 `AC_MSG_CHECKING', `AC_EGREP_CPP', and this warning if this part
488 of the test is useless.])
493 AU_DEFUN([AC_DYNIX_SEQ], [AC_FUNC_GETMNTENT])
498 AU_DEFUN([AC_IRIX_SUN],
500 AC_CHECK_LIB(sun, getpwnam)])
505 AU_DEFUN([AC_SCO_INTL], [AC_FUNC_STRFTIME])