# This file is part of Autoconf. -*- Autoconf -*-
# Macros that test for specific, unclassified, features.
#
# Copyright (C) 1992-1996, 1998-2017, 2020-2022 Free Software
# Foundation, Inc.
# This file is part of Autoconf. This program is free
# software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# Under Section 7 of GPL version 3, you are granted additional
# permissions described in the Autoconf Configure Script Exception,
# version 3.0, as published by the Free Software Foundation.
#
# You should have received a copy of the GNU General Public License
# and a copy of the Autoconf Configure Script Exception along with
# this program; see the files COPYINGv3 and COPYING.EXCEPTION
# respectively. If not, see .
# Written by David MacKenzie, with help from
# François Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.
## ------------------------- ##
## Checks for declarations. ##
## ------------------------- ##
# AC_DECL_SYS_SIGLIST
# -------------------
AN_IDENTIFIER([sys_siglist], [AC_CHECK_DECLS([sys_siglist])])
AU_DEFUN([AC_DECL_SYS_SIGLIST],
[AC_CHECK_DECLS([sys_siglist],,,
[#include
/* NetBSD declares sys_siglist in unistd.h. */
#ifdef HAVE_UNISTD_H
# include
#endif
])
])# AC_DECL_SYS_SIGLIST
## -------------------------------------- ##
## Checks for operating system services. ##
## -------------------------------------- ##
# AC_SYS_INTERPRETER
# ------------------
AC_DEFUN([AC_SYS_INTERPRETER],
[AC_CACHE_CHECK(whether @%:@! works in shell scripts, ac_cv_sys_interpreter,
[echo '#! /bin/cat
exit 69
' >conftest
chmod u+x conftest
(SHELL=/bin/sh; export SHELL; ./conftest >/dev/null 2>&1)
if test $? -ne 69; then
ac_cv_sys_interpreter=yes
else
ac_cv_sys_interpreter=no
fi
rm -f conftest])
interpval=$ac_cv_sys_interpreter
])
AU_DEFUN([AC_HAVE_POUNDBANG],
[AC_SYS_INTERPRETER],
[Remove this warning when you adjust your code to use
`AC_SYS_INTERPRETER'.])
AU_DEFUN([AC_ARG_ARRAY], [],
[$0 is no longer implemented: don't do unportable things
with arguments. Remove this warning when you adjust your code.])
# _AC_SYS_YEAR2038_TEST_CODE
# --------------------------
# C code used to probe for time_t that can represent time points more
# than 2**31 - 1 seconds after the epoch. With the usual Unix epoch,
# these correspond to dates after 2038-01-18 22:14:07 +0000 (Gregorian),
# hence the name.
AC_DEFUN([_AC_SYS_YEAR2038_TEST_CODE],
[[
#include
/* Check that time_t can represent 2**32 - 1 correctly. */
#define LARGE_TIME_T \\
((time_t) (((time_t) 1 << 30) - 1 + 3 * ((time_t) 1 << 30)))
int verify_time_t_range[(LARGE_TIME_T / 65537 == 65535
&& LARGE_TIME_T % 65537 == 0)
? 1 : -1];
]])
# _AC_SYS_YEAR2038_OPTIONS
# ------------------------
# List of known ways to enable support for large time_t. If you change
# this list you probably also need to change the AS_CASE at the end of
# _AC_SYS_YEAR2038_PROBE.
m4_define([_AC_SYS_YEAR2038_OPTIONS], m4_normalize(
["none needed"] dnl 64-bit and newer 32-bit Unix
["-D_TIME_BITS=64"] dnl glibc 2.34 with some 32-bit ABIs
["-D__MINGW_USE_VC2005_COMPAT"] dnl 32-bit MinGW
["-U_USE_32_BIT_TIME_T -D__MINGW_USE_VC2005_COMPAT"]
dnl 32-bit MinGW (misconfiguration)
))
# _AC_SYS_YEAR2038_PROBE([IF-NOT-DETECTED])
# -----------------------------------------
# Subroutine of AC_SYS_YEAR2038. Probe for time_t that can represent
# time points more than 2**31 - 1 seconds after the epoch (dates after
# 2038-01-18, see above) and set the cache variable ac_cv_sys_year2038_opts
# to one of the values in the _AC_SYS_YEAR2038_OPTIONS list, or to
# "support not detected" if none of them worked. Then, set compilation
# options and #defines as necessary to enable large time_t support.
#
# Note that we do not test whether mktime, localtime, etc. handle
# large values of time_t correctly, as that would require use of
# AC_TRY_RUN. Note also that some systems only support large time_t
# together with large off_t.
#
# If support is not detected, the behavior depends on which of the
# top-level AC_SYS_YEAR2038 macros was used (see below).
#
# If you change this macro you may also need to change
# _AC_SYS_YEAR2038_OPTIONS.
AC_DEFUN([_AC_SYS_YEAR2038_PROBE],
[AC_CACHE_CHECK([for $CC option to enable timestamps after Jan 2038],
[ac_cv_sys_year2038_opts],
[ac_save_CPPFLAGS="$CPPFLAGS"
ac_opt_found=no
for ac_opt in _AC_SYS_YEAR2038_OPTIONS; do
AS_IF([test x"$ac_opt" != x"none needed"],
[CPPFLAGS="$ac_save_CPPFLAGS $ac_opt"])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_YEAR2038_TEST_CODE])],
[ac_cv_sys_year2038_opts="$ac_opt"
ac_opt_found=yes])
test $ac_opt_found = no || break
done
CPPFLAGS="$ac_save_CPPFLAGS"
test $ac_opt_found = yes || ac_cv_sys_year2038_opts="support not detected"])
ac_have_year2038=yes
AS_CASE([$ac_cv_sys_year2038_opts],
["none needed"], [],
["support not detected"],
[ac_have_year2038=no
AS_CASE([$enable_year2038],
[required],
[AC_MSG_FAILURE([support for timestamps after Jan 2038 is required])],
[yes],
[# If we're not cross compiling and 'touch' works with a large
# timestamp, then we can presume the system supports wider time_t
# *somehow* and we just weren't able to detect it. One common
# case that we deliberately *don't* probe for is a system that
# supports both 32- and 64-bit ABIs but only the 64-bit ABI offers
# wide time_t. (It would be inappropriate for us to override an
# intentional use of -m32.) Error out, demanding use of
# --disable-year2038 if this is intentional.
AS_IF([test $cross_compiling = no],
[AS_IF([TZ=UTC0 touch -t 210602070628.15 conftest.time 2>/dev/null],
[AS_CASE([`TZ=UTC0 LC_ALL=C ls -l conftest.time 2>/dev/null`],
[*'Feb 7 2106'* | *'Feb 7 17:10'*],
[AC_MSG_FAILURE(m4_text_wrap(
[this system appears to support timestamps after January 2038,
but no mechanism for enabling wide 'time_t' was detected.
Did you mean to build a 64-bit binary? (e.g. 'CC="${CC} -m64"'.)
To proceed with 32-bit time_t, configure with '--disable-year2038'.],
[], [], [55]))])])])])],
["-D_TIME_BITS=64"],
[AC_DEFINE([_TIME_BITS], [64],
[Number of bits in time_t, on hosts where this is settable.])],
["-D__MINGW_USE_VC2005_COMPAT=1"],
[AC_DEFINE([__MINGW_USE_VC2005_COMPAT], [1],
[Define to 1 on platforms where this makes time_t a 64-bit type.])],
["-U_USE_32_BIT_TIME_T"*],
[AC_MSG_FAILURE(m4_text_wrap(
[the 'time_t' type is currently forced to be 32-bit.
It will stop working after January 2038.
Remove _USE_32BIT_TIME_T from the compiler flags.],
[], [], [55]))],
[AC_MSG_ERROR(
[internal error: bad value for \$ac_cv_sys_year2038_opts])])
])
# _AC_SYS_YEAR2038_ENABLE
# -----------------------
# Subroutine of AC_SYS_YEAR2038 and _AC_SYS_YEAR2038_OPT_IN.
# Depending on which of the YEAR2038 macros was used, add either an
# --enable-year2038, or a --disable-year2038, or no option at all to
# the configure script. Note that this is expanded very late and
# therefore there cannot be any code in the AC_ARG_ENABLE. The
# default value for `enable_year2038` is emitted unconditionally
# because the generated code always looks at this variable.
m4_define([_AC_SYS_YEAR2038_ENABLE],
[m4_divert_text([DEFAULTS],
m4_provide_if([AC_SYS_YEAR2038_REQUIRED],
[enable_year2038=required],
m4_provide_if([AC_SYS_YEAR2038],
[enable_year2038=yes],
[enable_year2038=no])))]dnl
[m4_provide_if([AC_SYS_YEAR2038_REQUIRED], [],
[AC_ARG_ENABLE([year2038],
m4_provide_if([AC_SYS_YEAR2038],
[AS_HELP_STRING([--disable-year2038],
[omit support for dates after Jan 2038])],
[AS_HELP_STRING([--enable-year2038],
[include support for dates after Jan 2038])]))])])
# _AC_SYS_YEAR2038_OPT_IN
# -----------------------
# If the --enable-year2038 option is given to configure, attempt to
# detect and activate support for large time_t on 32-bit systems.
# This macro is automatically invoked by AC_SYS_LARGEFILE when large
# *file* support is detected. It does not AC_REQUIRE AC_SYS_LARGEFILE
# to avoid a dependency loop, and is therefore unsafe to expose as a
# documented macro.
AC_DEFUN([_AC_SYS_YEAR2038_OPT_IN],
[m4_provide_if([_AC_SYS_YEAR2038_PROBE], [], [dnl
AS_IF([test "$enable_year2038" != no], [_AC_SYS_YEAR2038_PROBE])
AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])
])])
# AC_SYS_YEAR2038
# ---------------
# Attempt to detect and activate support for large time_t.
# On systems where time_t is not always 64 bits, this probe can be
# skipped by passing the --disable-year2038 option to configure.
AC_DEFUN([AC_SYS_YEAR2038],
[m4_provide_if([AC_SYS_LARGEFILE_REQUIRED], [],
[AC_REQUIRE([AC_SYS_LARGEFILE])])]dnl
[m4_provide_if([_AC_SYS_YEAR2038_PROBE], [], [dnl
AS_IF([test "$enable_year2038" != no], [_AC_SYS_YEAR2038_PROBE])
AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])
])])
# AC_SYS_YEAR2038_REQUIRED
# ------------------------
# Same as AC_SYS_YEAR2038, but declares that this program *requires*
# support for large time_t. If we cannot find any way to make time_t
# capable of representing values larger than 2**31 - 1, configure will
# error out. Furthermore, no --enable-year2038 nor --disable-year2038
# option will be available.
AC_DEFUN([AC_SYS_YEAR2038_REQUIRED],
[m4_provide_if([AC_SYS_LARGEFILE_REQUIRED], [],
[AC_REQUIRE([AC_SYS_LARGEFILE])])]dnl
[m4_provide_if([_AC_SYS_YEAR2038_PROBE], [], [dnl
_AC_SYS_YEAR2038_PROBE
AC_CONFIG_COMMANDS_PRE([_AC_SYS_YEAR2038_ENABLE])
])])
# _AC_SYS_LARGEFILE_TEST_CODE
# ---------------------------
# C code used to probe for large file support.
m4_define([_AC_SYS_LARGEFILE_TEST_CODE],
[@%:@include
/* Check that off_t can represent 2**63 - 1 correctly.
We can't simply define LARGE_OFF_T to be 9223372036854775807,
since some C++ compilers masquerading as C compilers
incorrectly reject 9223372036854775807. */
@%:@define LARGE_OFF_T (((off_t) 1 << 31 << 31) - 1 + ((off_t) 1 << 31 << 31))
int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
&& LARGE_OFF_T % 2147483647 == 1)
? 1 : -1]];[]dnl
])
# _AC_SYS_LARGEFILE_OPTIONS
# -------------------------
# List of known ways to enable support for large files. If you change
# this list you probably also need to change the AS_CASE at the end of
# _AC_SYS_LARGEFILE_PROBE.
m4_define([_AC_SYS_LARGEFILE_OPTIONS], m4_normalize(
["none needed"] dnl Most current systems
["-D_FILE_OFFSET_BITS=64"] dnl X/Open LFS spec
["-D_LARGE_FILES=1"] dnl AIX (which versions?)
["-n32"] dnl Irix 6.2 w/ SGI compiler
))
# _AC_SYS_LARGEFILE_PROBE
# -----------------------
# Subroutine of AC_SYS_LARGEFILE. Probe for large file support and set
# the cache variable ac_cv_sys_largefile_opts to one of the values in
# the _AC_SYS_LARGEFILE_OPTIONS list, or to "support not detected" if
# none of the options in that list worked. Then, set compilation
# options and #defines as necessary to enable large file support.
#
# If large file support is not detected, the behavior depends on which of
# the top-level AC_SYS_LARGEFILE macros was used (see below).
#
# If you change this macro you may also need to change
# _AC_SYS_LARGEFILE_OPTIONS.
AC_DEFUN([_AC_SYS_LARGEFILE_PROBE],
[AC_CACHE_CHECK([for $CC option to enable large file support],
[ac_cv_sys_largefile_opts],
[ac_save_CC="$CC"
ac_opt_found=no
for ac_opt in _AC_SYS_LARGEFILE_OPTIONS; do
AS_IF([test x"$ac_opt" != x"none needed"],
[CC="$ac_save_CC $ac_opt"])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_CODE])],
[ac_cv_sys_largefile_opts="$ac_opt"
ac_opt_found=yes])
test $ac_opt_found = no || break
done
CC="$ac_save_CC"
test $ac_opt_found = yes || ac_cv_sys_largefile_opts="support not detected"])
ac_have_largefile=yes
AS_CASE([$ac_cv_sys_largefile_opts],
["none needed"], [],
["support not detected"],
[ac_have_largefile=no
AS_IF([test $enable_largefile = required],
[AC_MSG_FAILURE([support for large files is required])])],
["-D_FILE_OFFSET_BITS=64"],
[AC_DEFINE([_FILE_OFFSET_BITS], [64],
[Number of bits in a file offset, on hosts where this is settable.])],
["-D_LARGE_FILES=1"],
[AC_DEFINE([_LARGE_FILES], [1],
[Define to 1 on platforms where this makes off_t a 64-bit type.])],
["-n32"],
[CC="$CC -n32"],
[AC_MSG_ERROR(
[internal error: bad value for \$ac_cv_sys_largefile_opts])])
_AC_SYS_YEAR2038_OPT_IN
])
# _AC_SYS_LARGEFILE_ENABLE
# ------------------------
# Subroutine of AC_SYS_LARGEFILE. If AC_SYS_LARGEFILE_REQUIRED was
# not used at any point in this configure script, add a
# --disable-largefile option to the configure script. Note that this
# is expanded very late and therefore there cannot be any code in the
# AC_ARG_ENABLE. The default value for `enable_largefile` is emitted
# unconditionally because the generated shell code always looks at
# this variable.
m4_define([_AC_SYS_LARGEFILE_ENABLE],
[m4_divert_text([DEFAULTS],
m4_provide_if([AC_SYS_LARGEFILE_REQUIRED],
[enable_largefile=required],
[enable_largefile=yes]))]dnl
[m4_provide_if([AC_SYS_LARGEFILE_REQUIRED], [],
[AC_ARG_ENABLE([largefile],
[AS_HELP_STRING([--disable-largefile], [omit support for large files])])])])
# AC_SYS_LARGEFILE
# ----------------
# By default, many hosts won't let programs access large files;
# one must use special compiler options to get large-file access to work.
# For more details about this brain damage please see:
# http://www.unix.org/version2/whatsnew/lfs20mar.html
# Additionally, on Linux file systems with 64-bit inodes a file that happens
# to have a 64-bit inode number cannot be accessed by 32-bit applications on
# Linux x86/x86_64. This can occur with file systems such as XFS and NFS.
# This macro allows configuration to continue if the system doesn't support
# large files; see also AC_SYS_LARGEFILE_REQUIRED.
AC_DEFUN([AC_SYS_LARGEFILE],
[m4_provide_if([_AC_SYS_LARGEFILE_PROBE], [], [dnl
AS_IF([test "$enable_largefile" != no], [_AC_SYS_LARGEFILE_PROBE])
AC_CONFIG_COMMANDS_PRE([_AC_SYS_LARGEFILE_ENABLE])
])])
# AC_SYS_LARGEFILE_REQUIRED
# -------------------------
# Same as AC_SYS_LARGEFILE, but declares that this program *requires*
# support for large files. If we cannot find a combination of compiler
# options and #defines that makes `off_t` capable of representing 2**63 - 1,
# `configure` will error out. Furthermore, `configure` will not offer a
# --disable-largefile command line option.
# If both AC_SYS_LARGEFILE and AC_SYS_LARGEFILE_REQUIRED are used in the
# same configure script -- in either order -- AC_SYS_LARGEFILE_REQUIRED wins.
AC_DEFUN([AC_SYS_LARGEFILE_REQUIRED],
[m4_provide_if([_AC_SYS_LARGEFILE_PROBE], [], [dnl
_AC_SYS_LARGEFILE_PROBE
AC_CONFIG_COMMANDS_PRE([_AC_SYS_LARGEFILE_ENABLE])
])])
# AC_SYS_LONG_FILE_NAMES
# ----------------------
# Security: use a temporary directory as the most portable way of
# creating files in /tmp securely. Removing them leaves a race
# condition, set -C is not portably guaranteed to use O_EXCL, so still
# leaves a race, and not all systems have the 'mktemp' utility. We
# still test for existence first in case of broken systems where the
# mkdir succeeds even when the directory exists. Broken systems may
# retain a race, but they probably have other security problems
# anyway; this should be secure on well-behaved systems. In any case,
# use of 'mktemp' is probably inappropriate here since it would fail in
# attempting to create different file names differing after the 14th
# character on file systems without long file names.
AC_DEFUN([AC_SYS_LONG_FILE_NAMES],
[AC_CACHE_CHECK(for long file names, ac_cv_sys_long_file_names,
[ac_cv_sys_long_file_names=yes
# Test for long file names in all the places we know might matter:
# . the current directory, where building will happen
# $prefix/lib where we will be installing things
# $exec_prefix/lib likewise
# $TMPDIR if set, where it might want to write temporary files
# /tmp where it might want to write temporary files
# /var/tmp likewise
# /usr/tmp likewise
for ac_dir in . "$TMPDIR" /tmp /var/tmp /usr/tmp "$prefix/lib" "$exec_prefix/lib"; do
# Skip $TMPDIR if it is empty or bogus, and skip $exec_prefix/lib
# in the usual case where exec_prefix is '${prefix}'.
case $ac_dir in #(
. | /* | ?:[[\\/]]*) ;; #(
*) continue;;
esac
test -w "$ac_dir/." || continue # It is less confusing to not echo anything here.
ac_xdir=$ac_dir/cf$$
(umask 077 && mkdir "$ac_xdir" 2>/dev/null) || continue
ac_tf1=$ac_xdir/conftest9012345
ac_tf2=$ac_xdir/conftest9012346
touch "$ac_tf1" 2>/dev/null && test -f "$ac_tf1" && test ! -f "$ac_tf2" ||
ac_cv_sys_long_file_names=no
rm -f -r "$ac_xdir" 2>/dev/null
test $ac_cv_sys_long_file_names = no && break
done])
if test $ac_cv_sys_long_file_names = yes; then
AC_DEFINE(HAVE_LONG_FILE_NAMES, 1,
[Define to 1 if you support file names longer than 14 characters.])
fi
])
# AC_SYS_RESTARTABLE_SYSCALLS
# ---------------------------
# If the system automatically restarts a system call that is
# interrupted by a signal, define 'HAVE_RESTARTABLE_SYSCALLS'.
AC_DEFUN([AC_SYS_RESTARTABLE_SYSCALLS],
[m4_warn([obsolete],
[$0: AC_SYS_RESTARTABLE_SYSCALLS is useful only when supporting very
old systems that lack 'sigaction' and 'SA_RESTART'. Don't bother with
this macro unless you need to support very old systems like 4.2BSD and
SVR3.])dnl
AC_REQUIRE([AC_HEADER_SYS_WAIT])dnl
AC_CACHE_CHECK(for restartable system calls, ac_cv_sys_restartable_syscalls,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[/* Exit 0 (true) if wait returns something other than -1,
i.e. the pid of the child, which means that wait was restarted
after getting the signal. */
AC_INCLUDES_DEFAULT
#include
#ifdef HAVE_SYS_WAIT_H
# include
#endif
/* Some platforms explicitly require an extern "C" signal handler
when using C++. */
#ifdef __cplusplus
extern "C"
#endif
void ucatch (int dummy) { }
int
main (void)
{
int i = fork (), status;
if (i == 0)
{
sleep (3);
kill (getppid (), SIGINT);
sleep (3);
return 0;
}
signal (SIGINT, ucatch);
status = wait (&i);
if (status == -1)
wait (&i);
return status == -1;
}])],
[ac_cv_sys_restartable_syscalls=yes],
[ac_cv_sys_restartable_syscalls=no])])
if test $ac_cv_sys_restartable_syscalls = yes; then
AC_DEFINE(HAVE_RESTARTABLE_SYSCALLS, 1,
[Define to 1 if system calls automatically restart after
interruption by a signal.])
fi
])# AC_SYS_RESTARTABLE_SYSCALLS
# AC_SYS_POSIX_TERMIOS
# --------------------
AC_DEFUN([AC_SYS_POSIX_TERMIOS],
[AC_CACHE_CHECK([POSIX termios], ac_cv_sys_posix_termios,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include
#include
#include
]],
[/* SunOS 4.0.3 has termios.h but not the library calls. */
tcgetattr(0, 0);])],
ac_cv_sys_posix_termios=yes,
ac_cv_sys_posix_termios=no)])
])# AC_SYS_POSIX_TERMIOS
## ------------------------------------ ##
## Checks for not-quite-Unix variants. ##
## ------------------------------------ ##
# AC_GNU_SOURCE
# -------------
AU_DEFUN([AC_GNU_SOURCE], [AC_USE_SYSTEM_EXTENSIONS])
# AC_CYGWIN
# ---------
# Check for Cygwin. This is a way to set the right value for
# EXEEXT.
AU_DEFUN([AC_CYGWIN],
[AC_CANONICAL_HOST
case $host_os in
*cygwin* ) CYGWIN=yes;;
* ) CYGWIN=no;;
esac
], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
matches *cygwin*])# AC_CYGWIN
# AC_EMXOS2
# ---------
# Check for EMX on OS/2. This is another way to set the right value
# for EXEEXT.
AU_DEFUN([AC_EMXOS2],
[AC_CANONICAL_HOST
case $host_os in
*emx* ) EMXOS2=yes;;
* ) EMXOS2=no;;
esac
], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
matches *emx*])# AC_EMXOS2
# AC_MINGW32
# ----------
# Check for mingw32. This is another way to set the right value for
# EXEEXT.
AU_DEFUN([AC_MINGW32],
[AC_CANONICAL_HOST
case $host_os in
*mingw32* ) MINGW32=yes;;
* ) MINGW32=no;;
esac
], [$0 is obsolete: use AC_CANONICAL_HOST and check if $host_os
matches *mingw32*])# AC_MINGW32
# AC_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
# We unconditionally define as many of the known feature-enabling
# as possible, reserving conditional behavior for macros that are
# known to cause problems on some platforms (such as __EXTENSIONS__).
AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
[AC_BEFORE([$0], [AC_PREPROC_IFELSE])dnl
AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
AC_BEFORE([$0], [AC_LINK_IFELSE])dnl
AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
AC_BEFORE([$0], [AC_CHECK_INCLUDES_DEFAULT])dnl
dnl #undef in AH_VERBATIM gets replaced with #define by AC_DEFINE.
dnl Use a different key than __EXTENSIONS__, as that name broke existing
dnl configure.ac when using autoheader 2.62.
dnl The macros below are in alphabetical order ignoring leading _ or __
dnl prefixes.
AH_VERBATIM([USE_SYSTEM_EXTENSIONS],
[/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable general extensions on macOS. */
#ifndef _DARWIN_C_SOURCE
# undef _DARWIN_C_SOURCE
#endif
/* Enable general extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
/* Enable GNU extensions on systems that have them. */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable X/Open compliant socket functions that do not require linking
with -lxnet on HP-UX 11.11. */
#ifndef _HPUX_ALT_XOPEN_SOCKET_API
# undef _HPUX_ALT_XOPEN_SOCKET_API
#endif
/* Identify the host operating system as Minix.
This macro does not affect the system headers' behavior.
A future release of Autoconf may stop defining this macro. */
#ifndef _MINIX
# undef _MINIX
#endif
/* Enable general extensions on NetBSD.
Enable NetBSD compatibility extensions on Minix. */
#ifndef _NETBSD_SOURCE
# undef _NETBSD_SOURCE
#endif
/* Enable OpenBSD compatibility extensions on NetBSD.
Oddly enough, this does nothing on OpenBSD. */
#ifndef _OPENBSD_SOURCE
# undef _OPENBSD_SOURCE
#endif
/* Define to 1 if needed for POSIX-compatible behavior. */
#ifndef _POSIX_SOURCE
# undef _POSIX_SOURCE
#endif
/* Define to 2 if needed for POSIX-compatible behavior. */
#ifndef _POSIX_1_SOURCE
# undef _POSIX_1_SOURCE
#endif
/* Enable POSIX-compatible threading on Solaris. */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions specified by ISO/IEC TS 18661-5:2014. */
#ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
# undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
#endif
/* Enable extensions specified by ISO/IEC TS 18661-1:2014. */
#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
# undef __STDC_WANT_IEC_60559_BFP_EXT__
#endif
/* Enable extensions specified by ISO/IEC TS 18661-2:2015. */
#ifndef __STDC_WANT_IEC_60559_DFP_EXT__
# undef __STDC_WANT_IEC_60559_DFP_EXT__
#endif
/* Enable extensions specified by C23 Annex F. */
#ifndef __STDC_WANT_IEC_60559_EXT__
# undef __STDC_WANT_IEC_60559_EXT__
#endif
/* Enable extensions specified by ISO/IEC TS 18661-4:2015. */
#ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__
# undef __STDC_WANT_IEC_60559_FUNCS_EXT__
#endif
/* Enable extensions specified by C23 Annex H and ISO/IEC TS 18661-3:2015. */
#ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
# undef __STDC_WANT_IEC_60559_TYPES_EXT__
#endif
/* Enable extensions specified by ISO/IEC TR 24731-2:2010. */
#ifndef __STDC_WANT_LIB_EXT2__
# undef __STDC_WANT_LIB_EXT2__
#endif
/* Enable extensions specified by ISO/IEC 24747:2009. */
#ifndef __STDC_WANT_MATH_SPEC_FUNCS__
# undef __STDC_WANT_MATH_SPEC_FUNCS__
#endif
/* Enable extensions on HP NonStop. */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable X/Open extensions. Define to 500 only if necessary
to make mbstate_t available. */
#ifndef _XOPEN_SOURCE
# undef _XOPEN_SOURCE
#endif
])dnl
AC_REQUIRE([AC_CHECK_INCLUDES_DEFAULT])dnl
_AC_CHECK_HEADER_ONCE([wchar.h])
_AC_CHECK_HEADER_ONCE([minix/config.h])
dnl Defining __EXTENSIONS__ may break the system headers on some systems.
dnl (FIXME: Which ones?)
AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
[ac_cv_safe_to_define___extensions__],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
# define __EXTENSIONS__ 1
]AC_INCLUDES_DEFAULT])],
[ac_cv_safe_to_define___extensions__=yes],
[ac_cv_safe_to_define___extensions__=no])])
dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to
dnl 500, regardless of whether compiling with -Ae or -D_HPUX_SOURCE=1.
dnl But defining _XOPEN_SOURCE may turn *off* extensions on platforms
dnl not covered by turn-on-extensions macros (notably Dragonfly, Free,
dnl and OpenBSD, which don't have any equivalent of _NETBSD_SOURCE) so
dnl it should only be defined when necessary.
AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
[ac_cv_should_define__xopen_source],
[ac_cv_should_define__xopen_source=no
AS_IF([test $ac_cv_header_wchar_h = yes],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#include
mbstate_t x;]])],
[],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#define _XOPEN_SOURCE 500
#include
mbstate_t x;]])],
[ac_cv_should_define__xopen_source=yes])])])])
AC_DEFINE([_ALL_SOURCE])
AC_DEFINE([_DARWIN_C_SOURCE])
AC_DEFINE([_GNU_SOURCE])
AC_DEFINE([_HPUX_ALT_XOPEN_SOCKET_API])
AC_DEFINE([_NETBSD_SOURCE])
AC_DEFINE([_OPENBSD_SOURCE])
AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])
AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__])
AC_DEFINE([__STDC_WANT_IEC_60559_EXT__])
AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__])
AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__])
AC_DEFINE([__STDC_WANT_LIB_EXT2__])
AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__])
AC_DEFINE([_TANDEM_SOURCE])
AS_IF([test $ac_cv_header_minix_config_h = yes],
[MINIX=yes
AC_DEFINE([_MINIX])
AC_DEFINE([_POSIX_SOURCE])
AC_DEFINE([_POSIX_1_SOURCE], [2])],
[MINIX=])
AS_IF([test $ac_cv_safe_to_define___extensions__ = yes],
[AC_DEFINE([__EXTENSIONS__])])
AS_IF([test $ac_cv_should_define__xopen_source = yes],
[AC_DEFINE([_XOPEN_SOURCE], [500])])
])# AC_USE_SYSTEM_EXTENSIONS
## -------------------------- ##
## Checks for UNIX variants. ##
## -------------------------- ##
# These are kludges which should be replaced by a single POSIX check.
# They aren't cached, to discourage their use.
# AC_AIX
# ------
AU_DEFUN([AC_AIX], [AC_USE_SYSTEM_EXTENSIONS])
# AC_MINIX
# --------
AU_DEFUN([AC_MINIX], [AC_USE_SYSTEM_EXTENSIONS])
# AC_ISC_POSIX
# ------------
AU_DEFUN([AC_ISC_POSIX], [AC_SEARCH_LIBS([strerror], [cposix])])
# AC_XENIX_DIR
# ------------
AU_DEFUN([AC_XENIX_DIR],
[AC_MSG_CHECKING([for Xenix])
AC_EGREP_CPP([yes],
[#if defined M_XENIX && ! defined M_UNIX
yes
@%:@endif],
[AC_MSG_RESULT([yes]); XENIX=yes],
[AC_MSG_RESULT([no]); XENIX=])
AC_HEADER_DIRENT[]dnl
],
[You shouldn't need to depend upon XENIX. Remove the
'AC_MSG_CHECKING', 'AC_EGREP_CPP', and this warning if this part
of the test is useless.])
# AC_DYNIX_SEQ
# ------------
AU_DEFUN([AC_DYNIX_SEQ], [AC_FUNC_GETMNTENT])
# AC_IRIX_SUN
# -----------
AU_DEFUN([AC_IRIX_SUN],
[AC_FUNC_GETMNTENT
AC_CHECK_LIB([sun], [getpwnam])])
# AC_SCO_INTL
# -----------
AU_DEFUN([AC_SCO_INTL], [AC_FUNC_STRFTIME])