X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fthreadlib.m4;h=8a621fd04dbe8e5e73b1da421de622adc092d9c2;hb=fb733077fcd97a36e1ffdb292387943df8e1b9b4;hp=3a8655e931d007df2db261c2724c1cd39bd7ab2b;hpb=76bc00ad16b87ebd68c3a96cc5f6bc20e17464b0;p=gnulib.git diff --git a/m4/threadlib.m4 b/m4/threadlib.m4 index 3a8655e93..8a621fd04 100644 --- a/m4/threadlib.m4 +++ b/m4/threadlib.m4 @@ -1,5 +1,5 @@ -# threadlib.m4 serial 1 (gettext-0.18) -dnl Copyright (C) 2005-2008 Free Software Foundation, Inc. +# threadlib.m4 serial 8 (gettext-0.18.2) +dnl Copyright (C) 2005-2011 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. @@ -9,6 +9,11 @@ dnl From Bruno Haible. dnl gl_THREADLIB dnl ------------ dnl Tests for a multithreading library to be used. +dnl If the configure.ac contains a definition of the gl_THREADLIB_DEFAULT_NO +dnl (it must be placed before the invocation of gl_THREADLIB_EARLY!), then the +dnl default is 'no', otherwise it is system dependent. In both cases, the user +dnl can change the choice through the options --enable-threads=choice or +dnl --disable-threads. dnl Defines at most one of the macros USE_POSIX_THREADS, USE_SOLARIS_THREADS, dnl USE_PTH_THREADS, USE_WIN32_THREADS dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use @@ -44,21 +49,34 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY], [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])], [AC_REQUIRE([AC_GNU_SOURCE])]) dnl Check for multithreading. - m4_divert_text([DEFAULTS], [gl_use_threads_default=]) - 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]), + m4_ifdef([gl_THREADLIB_DEFAULT_NO], + [m4_divert_text([DEFAULTS], [gl_use_threads_default=no])], + [m4_divert_text([DEFAULTS], [gl_use_threads_default=])]) + AC_ARG_ENABLE([threads], +AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ +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 . 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 @@ -69,7 +87,7 @@ AC_HELP_STRING([--disable-threads], [build without multithread safety]), # groks . cc also understands the flag -pthread, but # we don't use it because 1. gcc-2.95 doesn't understand -pthread, # 2. putting a flag into CPPFLAGS that has an effect on the linker - # causes the AC_TRY_LINK test below to succeed unexpectedly, + # causes the AC_LINK_IFELSE test below to succeed unexpectedly, # leading to wrong values of LIBTHREAD and LTLIBTHREAD. CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;; @@ -96,15 +114,46 @@ AC_DEFUN([gl_THREADLIB_BODY], LTLIBMULTITHREAD= if test "$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_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[extern void xyzzy (); +#pragma weak xyzzy]], + [[xyzzy();]])], + [gl_cv_have_weak=maybe]) + if test $gl_cv_have_weak = maybe; then + dnl Second, test whether it actually works. On Cygwin 1.7.2, with + dnl gcc 4.3, symbols declared weak always evaluate to the address 0. + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include +#pragma weak fputs +int main () +{ + return (fputs == NULL); +}]])], + [gl_cv_have_weak=yes], + [gl_cv_have_weak=no], + [dnl When cross-compiling, assume that only ELF platforms support + dnl weak symbols. + AC_EGREP_CPP([Extensible Linking Format], + [#ifdef __ELF__ + Extensible Linking Format + #endif + ], + [gl_cv_have_weak="guessing yes"], + [gl_cv_have_weak="guessing no"]) + ]) + fi + ]) if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that # it groks . It's added above, in gl_THREADLIB_EARLY_BODY. - AC_CHECK_HEADER(pthread.h, gl_have_pthread_h=yes, gl_have_pthread_h=no) + AC_CHECK_HEADER([pthread.h], + [gl_have_pthread_h=yes], [gl_have_pthread_h=no]) if test "$gl_have_pthread_h" = yes; then # Other possible tests: # -lpthreads (FSU threads, PCthreads) @@ -113,16 +162,18 @@ AC_DEFUN([gl_THREADLIB_BODY], # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist # in libc. IRIX 6.5 has the first one in both libc and libpthread, but # the second one only in libpthread, and lock.c needs it. - AC_TRY_LINK([#include ], - [pthread_mutex_lock((pthread_mutex_t*)0); - pthread_mutexattr_init((pthread_mutexattr_t*)0);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include ]], + [[pthread_mutex_lock((pthread_mutex_t*)0); + pthread_mutexattr_init((pthread_mutexattr_t*)0);]])], [gl_have_pthread=yes]) # Test for libpthread by looking for pthread_kill. (Not pthread_self, # since it is defined as a macro on OSF/1.) if test -n "$gl_have_pthread"; then # The program links fine without libpthread. But it may actually # need to link with libpthread in order to create multiple threads. - AC_CHECK_LIB(pthread, pthread_kill, + AC_CHECK_LIB([pthread], [pthread_kill], [LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread # On Solaris and HP-UX, most pthread functions exist also in libc. # Therefore pthread_in_use() needs to actually try to create a @@ -130,19 +181,19 @@ AC_DEFUN([gl_THREADLIB_BODY], # pthread_create will actually create a thread. case "$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 "$gl_have_pthread"; then # For FreeBSD 4. - AC_CHECK_LIB(c_r, pthread_kill, + AC_CHECK_LIB([c_r], [pthread_kill], [gl_have_pthread=yes LIBTHREAD=-lc_r LTLIBTHREAD=-lc_r LIBMULTITHREAD=-lc_r LTLIBMULTITHREAD=-lc_r]) @@ -150,11 +201,11 @@ AC_DEFUN([gl_THREADLIB_BODY], fi if test -n "$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= @@ -168,9 +219,13 @@ AC_DEFUN([gl_THREADLIB_BODY], gl_have_solaristhread= gl_save_LIBS="$LIBS" LIBS="$LIBS -lthread" - AC_TRY_LINK([#include -#include ], - [thr_self();], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[ +#include +#include + ]], + [[thr_self();]])], [gl_have_solaristhread=yes]) LIBS="$gl_save_LIBS" if test -n "$gl_have_solaristhread"; then @@ -179,10 +234,10 @@ AC_DEFUN([gl_THREADLIB_BODY], 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= @@ -192,11 +247,13 @@ AC_DEFUN([gl_THREADLIB_BODY], 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_self();], gl_have_pth=yes) + LIBS="$LIBS $LIBPTH" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM([[#include ]], [[pth_self();]])], + [gl_have_pth=yes]) LIBS="$gl_save_LIBS" if test -n "$gl_have_pth"; then gl_threads_api=pth @@ -204,11 +261,11 @@ AC_DEFUN([gl_THREADLIB_BODY], LTLIBTHREAD="$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= @@ -226,7 +283,7 @@ AC_DEFUN([gl_THREADLIB_BODY], 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 @@ -234,10 +291,10 @@ AC_DEFUN([gl_THREADLIB_BODY], 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],