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# This file is part of Autoconf. -*- Autoconf -*-
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# Macros that test for specific, unclassified, features.
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# Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
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# Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# As a special exception, the Free Software Foundation gives unlimited
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# permission to copy, distribute and modify the configure scripts that
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# are the output of Autoconf. You need not follow the terms of the GNU
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# General Public License when using or distributing such scripts, even
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# though portions of the text of Autoconf appear in them. The GNU
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# General Public License (GPL) does govern all other use of the material
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# that constitutes the Autoconf program.
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# Certain portions of the Autoconf source text are designed to be copied
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# (in certain cases, depending on the input) into the output of
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# Autoconf. We call these the "data" portions. The rest of the Autoconf
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# source text consists of comments plus executable code that decides which
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# of the data portions to output in any given case. We call these
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# comments and executable code the "non-data" portions. Autoconf never
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# copies any of the non-data portions into its output.
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# This special exception to the GPL applies to versions of Autoconf
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# released by the Free Software Foundation. When you make and
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# distribute a modified version of Autoconf, you may extend this special
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# exception to the GPL to apply to your modified version as well, *unless*
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# your modified version has the potential to copy into its output some
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# of the text that was the non-data portion of the version that you started
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# with. (In other words, unless your change moves or copies text from
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# the non-data portions to the data portions.) If your modification has
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# such potential, you must delete any notice of this special exception
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# to the GPL from your modified version.
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# Written by David MacKenzie, with help from
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# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
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# Roland McGrath, Noah Friedman, david d zuhn, and many others.
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## ------------------------- ##
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## Checks for declarations. ##
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## ------------------------- ##
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AC_DEFUN([AC_DECL_SYS_SIGLIST],
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[AC_CACHE_CHECK([for sys_siglist declaration in signal.h or unistd.h],
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ac_cv_decl_sys_siglist,
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[AC_LANG_PROGRAM([#include <sys/types.h>
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/* NetBSD declares sys_siglist in unistd.h. */
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], [char *msg = *(sys_siglist + 1);])],
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[ac_cv_decl_sys_siglist=yes],
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[ac_cv_decl_sys_siglist=no])])
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if test $ac_cv_decl_sys_siglist = yes; then
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AC_DEFINE(SYS_SIGLIST_DECLARED, 1,
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[Define to 1 if `sys_siglist' is declared by <signal.h>
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])# AC_DECL_SYS_SIGLIST
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## -------------------------------------- ##
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## Checks for operating system services. ##
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## -------------------------------------- ##
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AC_DEFUN([AC_SYS_INTERPRETER],
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[AC_CACHE_CHECK(whether @%:@! works in shell scripts, ac_cv_sys_interpreter,
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(SHELL=/bin/sh; export SHELL; ./conftest >/dev/null)
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if test $? -ne 69; then
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ac_cv_sys_interpreter=yes
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ac_cv_sys_interpreter=no
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interpval=$ac_cv_sys_interpreter
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AU_DEFUN([AC_HAVE_POUNDBANG],
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AC_DIAGNOSE([obsolete],
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[$0: Remove this warning when you adjust your code to use
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`AC_SYS_INTERPRETER'.])])
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AU_DEFUN([AC_ARG_ARRAY],
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[AC_DIAGNOSE([obsolete],
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[$0: no longer implemented: don't do unportable things
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with arguments. Remove this warning when you adjust your code.])])
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# _AC_SYS_LARGEFILE_TEST_INCLUDES
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# -------------------------------
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m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
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[@%:@include <sys/types.h>
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/* Check that off_t can represent 2**63 - 1 correctly.
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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@%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
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# [INCLUDES], [FUNCTION-BODY])
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# ----------------------------------------------------------
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m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
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[AC_CACHE_CHECK([for $1 value needed for large files], [$3],
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@define $1 $2
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if test "$$3" != no; then
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AC_DEFINE_UNQUOTED([$1], [$$3], [$4])
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])# _AC_SYS_LARGEFILE_MACRO_VALUE
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# By default, many hosts won't let programs access large files;
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# one must use special compiler options to get large-file access to work.
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# For more details about this brain damage please see:
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# http://www.sas.com/standards/large.file/x_open.20Mar96.html
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AC_DEFUN([AC_SYS_LARGEFILE],
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[AC_ARG_ENABLE(largefile,
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[ --disable-largefile omit support for large files])
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if test "$enable_largefile" != no; then
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AC_CACHE_CHECK([for special C compiler options needed for large files],
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ac_cv_sys_largefile_CC,
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[ac_cv_sys_largefile_CC=no
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if test "$GCC" != yes; then
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# IRIX 6.2 and later do not support large files by default,
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# so use the C compiler's -n32 option if that helps.
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AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
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AC_COMPILE_IFELSE([], [break])
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AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
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rm -f conftest.$ac_ext
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if test "$ac_cv_sys_largefile_CC" != no; then
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CC=$CC$ac_cv_sys_largefile_CC
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_AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
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ac_cv_sys_file_offset_bits,
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[Number of bits in a file offset, on hosts where this is settable.],
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[_AC_SYS_LARGEFILE_TEST_INCLUDES])
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_AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
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ac_cv_sys_large_files,
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[Define for large files, on AIX-style hosts.],
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[_AC_SYS_LARGEFILE_TEST_INCLUDES])
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# AC_SYS_LONG_FILE_NAMES
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# ----------------------
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# Security: use a temporary directory as the most portable way of
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# creating files in /tmp securely. Removing them leaves a race
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# condition, set -C is not portably guaranteed to use O_EXCL, so still
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# leaves a race, and not all systems have the `mktemp' utility. We
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# still test for existence first in case of broken systems where the
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# mkdir succeeds even when the directory exists. Broken systems may
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# retain a race, but they probably have other security problems
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# anyway; this should be secure on well-behaved systems. In any case,
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# use of `mktemp' is probably inappropriate here since it would fail in
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# attempting to create different file names differing after the 14th
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# character on file systems without long file names.
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AC_DEFUN([AC_SYS_LONG_FILE_NAMES],
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[AC_CACHE_CHECK(for long file names, ac_cv_sys_long_file_names,
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[ac_cv_sys_long_file_names=yes
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# Test for long file names in all the places we know might matter:
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# . the current directory, where building will happen
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# $prefix/lib where we will be installing things
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# $exec_prefix/lib likewise
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# eval it to expand exec_prefix.
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# $TMPDIR if set, where it might want to write temporary files
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# if $TMPDIR is not set:
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# /tmp where it might want to write temporary files
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if test -n "$TMPDIR" && test -d "$TMPDIR" && test -w "$TMPDIR"; then
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ac_tmpdirs='/tmp /var/tmp /usr/tmp'
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for ac_dir in . $ac_tmpdirs `eval echo $prefix/lib $exec_prefix/lib` ; do
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test -d $ac_dir || continue
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test -w $ac_dir || continue # It is less confusing to not echo anything here.
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(umask 077 && mkdir $ac_xdir 2>/dev/null) || continue
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ac_tf1=$ac_xdir/conftest9012345
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ac_tf2=$ac_xdir/conftest9012346
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(echo 1 >$ac_tf1) 2>/dev/null
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(echo 2 >$ac_tf2) 2>/dev/null
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ac_val=`cat $ac_tf1 2>/dev/null`
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if test ! -f $ac_tf1 || test "$ac_val" != 1; then
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ac_cv_sys_long_file_names=no
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rm -rf $ac_xdir 2>/dev/null
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rm -rf $ac_xdir 2>/dev/null
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if test $ac_cv_sys_long_file_names = yes; then
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AC_DEFINE(HAVE_LONG_FILE_NAMES, 1,
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[Define to 1 if you support file names longer than 14 characters.])
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# AC_SYS_RESTARTABLE_SYSCALLS
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# ---------------------------
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# If the system automatically restarts a system call that is
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# interrupted by a signal, define `HAVE_RESTARTABLE_SYSCALLS'.
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AC_DEFUN([AC_SYS_RESTARTABLE_SYSCALLS],
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[AC_DIAGNOSE([obsolete],
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[$0: System call restartability is now typically set at runtime.
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Remove this `AC_SYS_RESTARTABLE_SYSCALLS'
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and adjust your code to use `sigaction' with `SA_RESTART' instead.])dnl
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AC_REQUIRE([AC_HEADER_SYS_WAIT])dnl
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AC_CHECK_HEADERS(unistd.h)
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AC_CACHE_CHECK(for restartable system calls, ac_cv_sys_restartable_syscalls,
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[AC_RUN_IFELSE([AC_LANG_SOURCE(
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[/* Exit 0 (true) if wait returns something other than -1,
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i.e. the pid of the child, which means that wait was restarted
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after getting the signal. */
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#include <sys/types.h>
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# include <sys/wait.h>
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/* Some platforms explicitly require an extern "C" signal handler
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extern "C" void ucatch (int dummy) { }
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void ucatch (dummy) int dummy; { }
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int i = fork (), status;
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kill (getppid (), SIGINT);
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signal (SIGINT, ucatch);
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[ac_cv_sys_restartable_syscalls=yes],
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[ac_cv_sys_restartable_syscalls=no])])
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if test $ac_cv_sys_restartable_syscalls = yes; then
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AC_DEFINE(HAVE_RESTARTABLE_SYSCALLS, 1,
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[Define to 1 if system calls automatically restart after
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interruption by a signal.])
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])# AC_SYS_RESTARTABLE_SYSCALLS
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# AC_SYS_POSIX_TERMIOS
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# --------------------
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AC_DEFUN([AC_SYS_POSIX_TERMIOS],
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[AC_CACHE_CHECK([POSIX termios], ac_cv_sys_posix_termios,
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[AC_TRY_LINK([#include <sys/types.h>
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@%:@include <termios.h>],
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[/* SunOS 4.0.3 has termios.h but not the library calls. */
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ac_cv_sys_posix_termios=yes,
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ac_cv_sys_posix_termios=no)])
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])# AC_SYS_POSIX_TERMIOS
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## ------------------------------------ ##
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## Checks for not-quite-Unix variants. ##
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## ------------------------------------ ##
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# Check for Cygwin. This is a way to set the right value for
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AU_DEFUN([AC_CYGWIN],
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[AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
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AC_DIAGNOSE([obsolete],
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[$0 is obsolete: use AC_CANONICAL_HOST and $host_os])dnl
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*cygwin* ) CYGWIN=yes;;
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# Check for EMX on OS/2. This is another way to set the right value
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AU_DEFUN([AC_EMXOS2],
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[AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
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AC_DIAGNOSE([obsolete],
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[$0 is obsolete: use AC_CANONICAL_HOST and $host_os])dnl
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# Check for mingw32. This is another way to set the right value for
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AU_DEFUN([AC_MINGW32],
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[AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
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AC_DIAGNOSE([obsolete],
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[$0 is obsolete: use AC_CANONICAL_HOST and $host_os])dnl
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*mingw32* ) MINGW32=yes;;
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## -------------------------- ##
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## Checks for UNIX variants. ##
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## -------------------------- ##
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# These are kludges which should be replaced by a single POSIX check.
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# They aren't cached, to discourage their use.
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[AH_VERBATIM([_ALL_SOURCE],
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[/* Define to 1 if on AIX 3.
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System headers sometimes define this.
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We just want to avoid a redefinition error message. */
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@%:@ifndef _ALL_SOURCE
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@%:@ undef _ALL_SOURCE
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AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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AC_MSG_CHECKING([for AIX])
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[AC_MSG_RESULT([yes])
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AC_DEFINE(_ALL_SOURCE)],
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[AC_MSG_RESULT([no])])
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[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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AC_CHECK_HEADER(minix/config.h, MINIX=yes, MINIX=)
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if test "$MINIX" = yes; then
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AC_DEFINE(_POSIX_SOURCE, 1,
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[Define to 1 if you need to in order for `stat' and other things to
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AC_DEFINE(_POSIX_1_SOURCE, 2,
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[Define to 2 if the system does not provide POSIX.1 features except
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[Define to 1 if on MINIX.])
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AC_DEFUN([AC_ISC_POSIX], [AC_SEARCH_LIBS(strerror, cposix)])
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AU_DEFUN(AC_XENIX_DIR,
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[# You shouldn't need to depend upon XENIX. Remove this test if useless.
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AC_MSG_CHECKING([for Xenix])
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[#if defined(M_XENIX) && !defined(M_UNIX)
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[AC_MSG_RESULT([yes]); XENIX=yes],
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[AC_MSG_RESULT([no]); XENIX=])
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AC_HEADER_DIRENT[]dnl
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AU_DEFUN([AC_DYNIX_SEQ], [AC_FUNC_GETMNTENT])
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AU_DEFUN([AC_IRIX_SUN],
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AC_CHECK_LIB(sun, getpwnam)])
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AU_DEFUN([AC_SCO_INTL], [AC_FUNC_STRFTIME])
added
removed
lib/autoconf/specific.m4
