-# threadlib.m4 serial 1 (gettext-0.18)
-dnl Copyright (C) 2005-2008 Free Software Foundation, Inc.
+# threadlib.m4 serial 5 (gettext-0.18)
+dnl Copyright (C) 2005-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
[AC_REQUIRE([AC_GNU_SOURCE])])
dnl Check for multithreading.
m4_divert_text([DEFAULTS], [gl_use_threads_default=])
- AC_ARG_ENABLE(threads,
+ AC_ARG_ENABLE([threads],
AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])
AC_HELP_STRING([--disable-threads], [build without multithread safety]),
[gl_use_threads=$enableval],
[if test -n "$gl_use_threads_default"; then
gl_use_threads="$gl_use_threads_default"
else
+changequote(,)dnl
case "$host_os" in
dnl Disable multithreading by default on OSF/1, because it interferes
dnl with fork()/exec(): When msgexec is linked with -lpthread, its
dnl child process gets an endless segmentation fault inside execvp().
+ dnl Disable multithreading by default on Cygwin 1.5.x, because it has
+ dnl bugs that lead to endless loops or crashes. See
+ dnl <http://cygwin.com/ml/cygwin/2009-08/msg00283.html>.
osf*) gl_use_threads=no ;;
+ cygwin*)
+ case `uname -r` in
+ 1.[0-5].*) gl_use_threads=no ;;
+ *) gl_use_threads=yes ;;
+ esac
+ ;;
*) gl_use_threads=yes ;;
esac
+changequote([,])dnl
fi
])
if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
LTLIBMULTITHREAD=
if test "$gl_use_threads" != no; then
dnl Check whether the compiler and linker support weak declarations.
- AC_MSG_CHECKING([whether imported symbols can be declared weak])
- gl_have_weak=no
- AC_TRY_LINK([extern void xyzzy ();
-#pragma weak xyzzy], [xyzzy();], [gl_have_weak=yes])
- AC_MSG_RESULT([$gl_have_weak])
+ AC_CACHE_CHECK([whether imported symbols can be declared weak],
+ [gl_cv_have_weak],
+ [gl_cv_have_weak=no
+ dnl First, test whether the compiler accepts it syntactically.
+ AC_TRY_LINK([extern void xyzzy ();
+#pragma weak xyzzy], [xyzzy();], [gl_cv_have_weak=maybe])
+ if test $gl_cv_have_weak = maybe; then
+ dnl Second, test whether it actually works. On Cygwin 1.7.2, with
+ dnl gcc 4.3, symbols declared weak always evaluate to the address 0.
+ AC_TRY_RUN([
+#include <stdio.h>
+#pragma weak fputs
+int main ()
+{
+ return (fputs == NULL);
+}], [gl_cv_have_weak=yes], [gl_cv_have_weak=no],
+ [dnl When cross-compiling, assume that only ELF platforms support
+ dnl weak symbols.
+ AC_EGREP_CPP([Extensible Linking Format],
+ [#ifdef __ELF__
+ Extensible Linking Format
+ #endif
+ ],
+ [gl_cv_have_weak="guessing yes"],
+ [gl_cv_have_weak="guessing no"])
+ ])
+ fi
+ ])
if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
# On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
# it groks <pthread.h>. It's added above, in gl_THREADLIB_EARLY_BODY.
- AC_CHECK_HEADER(pthread.h, gl_have_pthread_h=yes, gl_have_pthread_h=no)
+ AC_CHECK_HEADER([pthread.h],
+ [gl_have_pthread_h=yes], [gl_have_pthread_h=no])
if test "$gl_have_pthread_h" = yes; then
# Other possible tests:
# -lpthreads (FSU threads, PCthreads)
if test -n "$gl_have_pthread"; then
# The program links fine without libpthread. But it may actually
# need to link with libpthread in order to create multiple threads.
- AC_CHECK_LIB(pthread, pthread_kill,
+ AC_CHECK_LIB([pthread], [pthread_kill],
[LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread
# On Solaris and HP-UX, most pthread functions exist also in libc.
# Therefore pthread_in_use() needs to actually try to create a
# pthread_create will actually create a thread.
case "$host_os" in
solaris* | hpux*)
- AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], 1,
+ AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
[Define if the pthread_in_use() detection is hard.])
esac
])
else
# Some library is needed. Try libpthread and libc_r.
- AC_CHECK_LIB(pthread, pthread_kill,
+ AC_CHECK_LIB([pthread], [pthread_kill],
[gl_have_pthread=yes
LIBTHREAD=-lpthread LTLIBTHREAD=-lpthread
LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread])
if test -z "$gl_have_pthread"; then
# For FreeBSD 4.
- AC_CHECK_LIB(c_r, pthread_kill,
+ AC_CHECK_LIB([c_r], [pthread_kill],
[gl_have_pthread=yes
LIBTHREAD=-lc_r LTLIBTHREAD=-lc_r
LIBMULTITHREAD=-lc_r LTLIBMULTITHREAD=-lc_r])
fi
if test -n "$gl_have_pthread"; then
gl_threads_api=posix
- AC_DEFINE([USE_POSIX_THREADS], 1,
+ AC_DEFINE([USE_POSIX_THREADS], [1],
[Define if the POSIX multithreading library can be used.])
if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
- if test $gl_have_weak = yes; then
- AC_DEFINE([USE_POSIX_THREADS_WEAK], 1,
+ if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
+ AC_DEFINE([USE_POSIX_THREADS_WEAK], [1],
[Define if references to the POSIX multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
LTLIBTHREAD=-lthread
LIBMULTITHREAD="$LIBTHREAD"
LTLIBMULTITHREAD="$LTLIBTHREAD"
- AC_DEFINE([USE_SOLARIS_THREADS], 1,
+ AC_DEFINE([USE_SOLARIS_THREADS], [1],
[Define if the old Solaris multithreading library can be used.])
- if test $gl_have_weak = yes; then
- AC_DEFINE([USE_SOLARIS_THREADS_WEAK], 1,
+ if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
+ AC_DEFINE([USE_SOLARIS_THREADS_WEAK], [1],
[Define if references to the old Solaris multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
fi
if test "$gl_use_threads" = pth; then
gl_save_CPPFLAGS="$CPPFLAGS"
- AC_LIB_LINKFLAGS(pth)
+ AC_LIB_LINKFLAGS([pth])
gl_have_pth=
gl_save_LIBS="$LIBS"
LIBS="$LIBS -lpth"
- AC_TRY_LINK([#include <pth.h>], [pth_self();], gl_have_pth=yes)
+ AC_TRY_LINK([#include <pth.h>], [pth_self();], [gl_have_pth=yes])
LIBS="$gl_save_LIBS"
if test -n "$gl_have_pth"; then
gl_threads_api=pth
LTLIBTHREAD="$LTLIBPTH"
LIBMULTITHREAD="$LIBTHREAD"
LTLIBMULTITHREAD="$LTLIBTHREAD"
- AC_DEFINE([USE_PTH_THREADS], 1,
+ AC_DEFINE([USE_PTH_THREADS], [1],
[Define if the GNU Pth multithreading library can be used.])
if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
- if test $gl_have_weak = yes; then
- AC_DEFINE([USE_PTH_THREADS_WEAK], 1,
+ if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
+ AC_DEFINE([USE_PTH_THREADS_WEAK], [1],
[Define if references to the GNU Pth multithreading library should be made weak.])
LIBTHREAD=
LTLIBTHREAD=
esac
}; then
gl_threads_api=win32
- AC_DEFINE([USE_WIN32_THREADS], 1,
+ AC_DEFINE([USE_WIN32_THREADS], [1],
[Define if the Win32 multithreading API can be used.])
fi
fi
fi
AC_MSG_CHECKING([for multithread API to use])
AC_MSG_RESULT([$gl_threads_api])
- AC_SUBST(LIBTHREAD)
- AC_SUBST(LTLIBTHREAD)
- AC_SUBST(LIBMULTITHREAD)
- AC_SUBST(LTLIBMULTITHREAD)
+ AC_SUBST([LIBTHREAD])
+ AC_SUBST([LTLIBTHREAD])
+ AC_SUBST([LIBMULTITHREAD])
+ AC_SUBST([LTLIBMULTITHREAD])
])
AC_DEFUN([gl_THREADLIB],
projects / gnulib.git / blobdiff