X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fthreadlib.m4;h=9cedb67006511f581431f1fdb95400918d49abfc;hb=85324298b2acc2f756c3e162446c810507e4c08f;hp=bba460e4bcbf1f675b43580b30fa064b7b485c80;hpb=b2e2010c7c902235b5efb5bd3c6529f61b093aa4;p=gnulib.git diff --git a/m4/threadlib.m4 b/m4/threadlib.m4 index bba460e4b..9cedb6700 100644 --- a/m4/threadlib.m4 +++ b/m4/threadlib.m4 @@ -1,5 +1,5 @@ -# threadlib.m4 serial 4 (gettext-0.18) -dnl Copyright (C) 2005-2010 Free Software Foundation, Inc. +# threadlib.m4 serial 9 (gettext-0.18.2) +dnl Copyright (C) 2005-2012 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. @@ -9,8 +9,13 @@ 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 USE_PTH_THREADS, USE_WINDOWS_THREADS dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with dnl libtool). @@ -44,10 +49,12 @@ 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=]) + 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]) -AC_HELP_STRING([--disable-threads], [build without multithread safety]), +AC_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [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="$gl_use_threads_default" @@ -80,7 +87,7 @@ changequote([,])dnl # groks . cc also understands the flag -pthread, but # we don't use it because 1. gcc-2.95 doesn't understand -pthread, # 2. putting a flag into CPPFLAGS that has an effect on the linker - # causes the AC_TRY_LINK test below to succeed unexpectedly, + # causes the AC_LINK_IFELSE test below to succeed unexpectedly, # leading to wrong values of LIBTHREAD and LTLIBTHREAD. CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;; @@ -107,11 +114,41 @@ 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 "$gl_use_threads" = posix; then # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that # it groks . It's added above, in gl_THREADLIB_EARLY_BODY. @@ -125,9 +162,11 @@ AC_DEFUN([gl_THREADLIB_BODY], # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist # in libc. IRIX 6.5 has the first one in both libc and libpthread, but # the second one only in libpthread, and lock.c needs it. - AC_TRY_LINK([#include ], - [pthread_mutex_lock((pthread_mutex_t*)0); - pthread_mutexattr_init((pthread_mutexattr_t*)0);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include ]], + [[pthread_mutex_lock((pthread_mutex_t*)0); + pthread_mutexattr_init((pthread_mutexattr_t*)0);]])], [gl_have_pthread=yes]) # Test for libpthread by looking for pthread_kill. (Not pthread_self, # since it is defined as a macro on OSF/1.) @@ -165,7 +204,7 @@ AC_DEFUN([gl_THREADLIB_BODY], AC_DEFINE([USE_POSIX_THREADS], [1], [Define if the POSIX multithreading library can be used.]) if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then - if test $gl_have_weak = yes; then + if case "$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= @@ -180,9 +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 @@ -193,7 +236,7 @@ AC_DEFUN([gl_THREADLIB_BODY], LTLIBMULTITHREAD="$LTLIBTHREAD" AC_DEFINE([USE_SOLARIS_THREADS], [1], [Define if the old Solaris multithreading library can be used.]) - if test $gl_have_weak = yes; then + if case "$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= @@ -207,8 +250,10 @@ AC_DEFUN([gl_THREADLIB_BODY], 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 "$gl_have_pth"; then gl_threads_api=pth @@ -219,7 +264,7 @@ AC_DEFUN([gl_THREADLIB_BODY], AC_DEFINE([USE_PTH_THREADS], [1], [Define if the GNU Pth multithreading library can be used.]) if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then - if test $gl_have_weak = yes; then + if case "$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= @@ -231,17 +276,19 @@ AC_DEFUN([gl_THREADLIB_BODY], fi fi if test -z "$gl_have_pthread"; then - if test "$gl_use_threads" = yes || test "$gl_use_threads" = win32; then - if { case "$host_os" in - mingw*) true;; - *) false;; - esac - }; then - gl_threads_api=win32 - AC_DEFINE([USE_WIN32_THREADS], [1], - [Define if the Win32 multithreading API can be used.]) - fi - fi + case "$gl_use_threads" in + yes | windows | win32) # The 'win32' is for backward compatibility. + if { case "$host_os" in + mingw*) true;; + *) false;; + esac + }; then + gl_threads_api=windows + AC_DEFINE([USE_WINDOWS_THREADS], [1], + [Define if the native Windows multithreading API can be used.]) + fi + ;; + esac fi fi AC_MSG_CHECKING([for multithread API to use]) @@ -313,7 +360,7 @@ dnl Cygwin posix -lpthread Y OK dnl dnl Any of the above pth -lpth 0.0 dnl -dnl Mingw win32 N OK +dnl Mingw windows N OK dnl dnl BeOS 5 -- dnl