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Editing: specific.m4
# This file is part of Autoconf. -*- Autoconf -*- # Macros that test for specific, unclassified, features. # # Copyright (C) 1992-1996, 1998-2012 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 <http://www.gnu.org/licenses/>. # Written by David MacKenzie, with help from # Franc,ois 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 <signal.h> /* NetBSD declares sys_siglist in unistd.h. */ #ifdef HAVE_UNISTD_H # include <unistd.h> #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_LARGEFILE_TEST_INCLUDES # ------------------------------- m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES], [@%:@include <sys/types.h> /* 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 << 62) - 1 + ((off_t) 1 << 62)) int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721 && LARGE_OFF_T % 2147483647 == 1) ? 1 : -1]];[]dnl ]) # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, # CACHE-VAR, # DESCRIPTION, # PROLOGUE, [FUNCTION-BODY]) # -------------------------------------------------------- m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE], [AC_CACHE_CHECK([for $1 value needed for large files], [$3], [while :; do m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( [AC_LANG_PROGRAM([$5], [$6])], [$3=no; break]) m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])( [AC_LANG_PROGRAM([@%:@define $1 $2 $5], [$6])], [$3=$2; break]) $3=unknown break done]) case $$3 in #( no | unknown) ;; *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);; esac rm -rf conftest*[]dnl ])# _AC_SYS_LARGEFILE_MACRO_VALUE # AC_SYS_LARGEFILE # ---------------- # By default, many hosts won't let programs access large files; # one must use special compiler options to get large-file access to work. # For more details about this brain damage please see: # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html AC_DEFUN([AC_SYS_LARGEFILE], [AC_ARG_ENABLE(largefile, [ --disable-largefile omit support for large files]) if test "$enable_largefile" != no; then AC_CACHE_CHECK([for special C compiler options needed for large files], ac_cv_sys_largefile_CC, [ac_cv_sys_largefile_CC=no if test "$GCC" != yes; then ac_save_CC=$CC while :; do # IRIX 6.2 and later do not support large files by default, # so use the C compiler's -n32 option if that helps. AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])]) AC_COMPILE_IFELSE([], [break]) CC="$CC -n32" AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break]) break done CC=$ac_save_CC rm -f conftest.$ac_ext fi]) if test "$ac_cv_sys_largefile_CC" != no; then CC=$CC$ac_cv_sys_largefile_CC fi _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits, [Number of bits in a file offset, on hosts where this is settable.], [_AC_SYS_LARGEFILE_TEST_INCLUDES]) if test $ac_cv_sys_file_offset_bits = unknown; then _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files, [Define for large files, on AIX-style hosts.], [_AC_SYS_LARGEFILE_TEST_INCLUDES]) fi AH_VERBATIM([_DARWIN_USE_64_BIT_INODE], [/* Enable large inode numbers on Mac OS X 10.5. */ #ifndef _DARWIN_USE_64_BIT_INODE # define _DARWIN_USE_64_BIT_INODE 1 #endif]) fi ])# AC_SYS_LARGEFILE # 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], [AC_DIAGNOSE([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 <signal.h> #ifdef HAVE_SYS_WAIT_H # include <sys/wait.h> #endif /* Some platforms explicitly require an extern "C" signal handler when using C++. */ #ifdef __cplusplus extern "C" void ucatch (int dummy) { } #else void ucatch (dummy) int dummy; { } #endif int main () { 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 <sys/types.h> #include <unistd.h> #include <termios.h> ]], [/* 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. # # Remember that #undef in AH_VERBATIM gets replaced with #define by # AC_DEFINE. The goal here is to define all known feature-enabling # macros, then, if reports of conflicts are made, disable macros that # cause problems on some platforms (such as __EXTENSIONS__). AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl AC_BEFORE([$0], [AC_RUN_IFELSE])dnl AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) if test "$MINIX" = yes; then AC_DEFINE([_POSIX_SOURCE], [1], [Define to 1 if you need to in order for `stat' and other things to work.]) AC_DEFINE([_POSIX_1_SOURCE], [2], [Define to 2 if the system does not provide POSIX.1 features except with this defined.]) AC_DEFINE([_MINIX], [1], [Define to 1 if on MINIX.]) fi dnl Use a different key than __EXTENSIONS__, as that name broke existing dnl configure.ac when using autoheader 2.62. AH_VERBATIM([USE_SYSTEM_EXTENSIONS], [/* Enable extensions on AIX 3, Interix. */ #ifndef _ALL_SOURCE # undef _ALL_SOURCE #endif /* Enable GNU extensions on systems that have them. */ #ifndef _GNU_SOURCE # undef _GNU_SOURCE #endif /* Enable threading extensions on Solaris. */ #ifndef _POSIX_PTHREAD_SEMANTICS # undef _POSIX_PTHREAD_SEMANTICS #endif /* Enable extensions on HP NonStop. */ #ifndef _TANDEM_SOURCE # undef _TANDEM_SOURCE #endif /* Enable general extensions on Solaris. */ #ifndef __EXTENSIONS__ # undef __EXTENSIONS__ #endif ]) 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])]) test $ac_cv_safe_to_define___extensions__ = yes && AC_DEFINE([__EXTENSIONS__]) AC_DEFINE([_ALL_SOURCE]) AC_DEFINE([_GNU_SOURCE]) AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) AC_DEFINE([_TANDEM_SOURCE]) ])# 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])
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