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| # =========================================================================== | ||
| # http://www.gnu.org/software/autoconf-archive/ax_pthread.html | ||
| # =========================================================================== | ||
| # | ||
| # SYNOPSIS | ||
| # | ||
| # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) | ||
| # | ||
| # DESCRIPTION | ||
| # | ||
| # This macro figures out how to build C programs using POSIX threads. It | ||
| # sets the PTHREAD_LIBS output variable to the threads library and linker | ||
| # flags, and the PTHREAD_CFLAGS output variable to any special C compiler | ||
| # flags that are needed. (The user can also force certain compiler | ||
| # flags/libs to be tested by setting these environment variables.) | ||
| # | ||
| # Also sets PTHREAD_CC to any special C compiler that is needed for | ||
| # multi-threaded programs (defaults to the value of CC otherwise). (This | ||
| # is necessary on AIX to use the special cc_r compiler alias.) | ||
| # | ||
| # NOTE: You are assumed to not only compile your program with these flags, | ||
| # but also link it with them as well. e.g. you should link with | ||
| # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS | ||
| # | ||
| # If you are only building threads programs, you may wish to use these | ||
| # variables in your default LIBS, CFLAGS, and CC: | ||
| # | ||
| # LIBS="$PTHREAD_LIBS $LIBS" | ||
| # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | ||
| # CC="$PTHREAD_CC" | ||
| # | ||
| # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant | ||
| # has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name | ||
| # (e.g. PTHREAD_CREATE_UNDETACHED on AIX). | ||
| # | ||
| # ACTION-IF-FOUND is a list of shell commands to run if a threads library | ||
| # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it | ||
| # is not found. If ACTION-IF-FOUND is not specified, the default action | ||
| # will define HAVE_PTHREAD. | ||
| # | ||
| # Please let the authors know if this macro fails on any platform, or if | ||
| # you have any other suggestions or comments. This macro was based on work | ||
| # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help | ||
| # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by | ||
| # Alejandro Forero Cuervo to the autoconf macro repository. We are also | ||
| # grateful for the helpful feedback of numerous users. | ||
| # | ||
| # LICENSE | ||
| # | ||
| # Copyright (c) 2008 Steven G. Johnson <[email protected]> | ||
| # | ||
| # 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. | ||
| # | ||
| # You should have received a copy of the GNU General Public License along | ||
| # with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| # | ||
| # As a special exception, the respective Autoconf Macro's copyright owner | ||
| # gives unlimited permission to copy, distribute and modify the configure | ||
| # scripts that are the output of Autoconf when processing the Macro. You | ||
| # need not follow the terms of the GNU General Public License when using | ||
| # or distributing such scripts, even though portions of the text of the | ||
| # Macro appear in them. The GNU General Public License (GPL) does govern | ||
| # all other use of the material that constitutes the Autoconf Macro. | ||
| # | ||
| # This special exception to the GPL applies to versions of the Autoconf | ||
| # Macro released by the Autoconf Archive. When you make and distribute a | ||
| # modified version of the Autoconf Macro, you may extend this special | ||
| # exception to the GPL to apply to your modified version as well. | ||
|
|
||
| #serial 11 | ||
|
|
||
| AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) | ||
| AC_DEFUN([AX_PTHREAD], [ | ||
| AC_REQUIRE([AC_CANONICAL_HOST]) | ||
| AC_LANG_SAVE | ||
| AC_LANG_C | ||
| ax_pthread_ok=no | ||
| # We used to check for pthread.h first, but this fails if pthread.h | ||
| # requires special compiler flags (e.g. on True64 or Sequent). | ||
| # It gets checked for in the link test anyway. | ||
| # First of all, check if the user has set any of the PTHREAD_LIBS, | ||
| # etcetera environment variables, and if threads linking works using | ||
| # them: | ||
| if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then | ||
| save_CFLAGS="$CFLAGS" | ||
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | ||
| save_LIBS="$LIBS" | ||
| LIBS="$PTHREAD_LIBS $LIBS" | ||
| AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) | ||
| AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes) | ||
| AC_MSG_RESULT($ax_pthread_ok) | ||
| if test x"$ax_pthread_ok" = xno; then | ||
| PTHREAD_LIBS="" | ||
| PTHREAD_CFLAGS="" | ||
| fi | ||
| LIBS="$save_LIBS" | ||
| CFLAGS="$save_CFLAGS" | ||
| fi | ||
| # We must check for the threads library under a number of different | ||
| # names; the ordering is very important because some systems | ||
| # (e.g. DEC) have both -lpthread and -lpthreads, where one of the | ||
| # libraries is broken (non-POSIX). | ||
| # Create a list of thread flags to try. Items starting with a "-" are | ||
| # C compiler flags, and other items are library names, except for "none" | ||
| # which indicates that we try without any flags at all, and "pthread-config" | ||
| # which is a program returning the flags for the Pth emulation library. | ||
| ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" | ||
| # The ordering *is* (sometimes) important. Some notes on the | ||
| # individual items follow: | ||
| # pthreads: AIX (must check this before -lpthread) | ||
| # none: in case threads are in libc; should be tried before -Kthread and | ||
| # other compiler flags to prevent continual compiler warnings | ||
| # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) | ||
| # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) | ||
| # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) | ||
| # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) | ||
| # -pthreads: Solaris/gcc | ||
| # -mthreads: Mingw32/gcc, Lynx/gcc | ||
| # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it | ||
| # doesn't hurt to check since this sometimes defines pthreads too; | ||
| # also defines -D_REENTRANT) | ||
| # ... -mt is also the pthreads flag for HP/aCC | ||
| # pthread: Linux, etcetera | ||
| # --thread-safe: KAI C++ | ||
| # pthread-config: use pthread-config program (for GNU Pth library) | ||
| case "${host_cpu}-${host_os}" in | ||
| *solaris*) | ||
| # On Solaris (at least, for some versions), libc contains stubbed | ||
| # (non-functional) versions of the pthreads routines, so link-based | ||
| # tests will erroneously succeed. (We need to link with -pthreads/-mt/ | ||
| # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather | ||
| # a function called by this macro, so we could check for that, but | ||
| # who knows whether they'll stub that too in a future libc.) So, | ||
| # we'll just look for -pthreads and -lpthread first: | ||
| ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags" | ||
| ;; | ||
| *-darwin*) | ||
| ax_pthread_flags="-pthread $ax_pthread_flags" | ||
| ;; | ||
| esac | ||
| if test x"$ax_pthread_ok" = xno; then | ||
| for flag in $ax_pthread_flags; do | ||
| case $flag in | ||
| none) | ||
| AC_MSG_CHECKING([whether pthreads work without any flags]) | ||
| ;; | ||
| -*) | ||
| AC_MSG_CHECKING([whether pthreads work with $flag]) | ||
| PTHREAD_CFLAGS="$flag" | ||
| ;; | ||
| pthread-config) | ||
| AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no) | ||
| if test x"$ax_pthread_config" = xno; then continue; fi | ||
| PTHREAD_CFLAGS="`pthread-config --cflags`" | ||
| PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" | ||
| ;; | ||
| *) | ||
| AC_MSG_CHECKING([for the pthreads library -l$flag]) | ||
| PTHREAD_LIBS="-l$flag" | ||
| ;; | ||
| esac | ||
| save_LIBS="$LIBS" | ||
| save_CFLAGS="$CFLAGS" | ||
| LIBS="$PTHREAD_LIBS $LIBS" | ||
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | ||
| # Check for various functions. We must include pthread.h, | ||
| # since some functions may be macros. (On the Sequent, we | ||
| # need a special flag -Kthread to make this header compile.) | ||
| # We check for pthread_join because it is in -lpthread on IRIX | ||
| # while pthread_create is in libc. We check for pthread_attr_init | ||
| # due to DEC craziness with -lpthreads. We check for | ||
| # pthread_cleanup_push because it is one of the few pthread | ||
| # functions on Solaris that doesn't have a non-functional libc stub. | ||
| # We try pthread_create on general principles. | ||
| AC_TRY_LINK([#include <pthread.h> | ||
| static void routine(void* a) {a=0;} | ||
| static void* start_routine(void* a) {return a;}], | ||
| [pthread_t th; pthread_attr_t attr; | ||
| pthread_create(&th,0,start_routine,0); | ||
| pthread_join(th, 0); | ||
| pthread_attr_init(&attr); | ||
| pthread_cleanup_push(routine, 0); | ||
| pthread_cleanup_pop(0); ], | ||
| [ax_pthread_ok=yes]) | ||
| LIBS="$save_LIBS" | ||
| CFLAGS="$save_CFLAGS" | ||
| AC_MSG_RESULT($ax_pthread_ok) | ||
| if test "x$ax_pthread_ok" = xyes; then | ||
| break; | ||
| fi | ||
| PTHREAD_LIBS="" | ||
| PTHREAD_CFLAGS="" | ||
| done | ||
| fi | ||
| # Various other checks: | ||
| if test "x$ax_pthread_ok" = xyes; then | ||
| save_LIBS="$LIBS" | ||
| LIBS="$PTHREAD_LIBS $LIBS" | ||
| save_CFLAGS="$CFLAGS" | ||
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | ||
| # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. | ||
| AC_MSG_CHECKING([for joinable pthread attribute]) | ||
| attr_name=unknown | ||
| for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do | ||
| AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], | ||
| [attr_name=$attr; break]) | ||
| done | ||
| AC_MSG_RESULT($attr_name) | ||
| if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then | ||
| AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, | ||
| [Define to necessary symbol if this constant | ||
| uses a non-standard name on your system.]) | ||
| fi | ||
| AC_MSG_CHECKING([if more special flags are required for pthreads]) | ||
| flag=no | ||
| case "${host_cpu}-${host_os}" in | ||
| *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; | ||
| *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; | ||
| esac | ||
| AC_MSG_RESULT(${flag}) | ||
| if test "x$flag" != xno; then | ||
| PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" | ||
| fi | ||
| LIBS="$save_LIBS" | ||
| CFLAGS="$save_CFLAGS" | ||
| # More AIX lossage: must compile with xlc_r or cc_r | ||
| if test x"$GCC" != xyes; then | ||
| AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) | ||
| else | ||
| PTHREAD_CC=$CC | ||
| fi | ||
| else | ||
| PTHREAD_CC="$CC" | ||
| fi | ||
| AC_SUBST(PTHREAD_LIBS) | ||
| AC_SUBST(PTHREAD_CFLAGS) | ||
| AC_SUBST(PTHREAD_CC) | ||
| # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | ||
| if test x"$ax_pthread_ok" = xyes; then | ||
| ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) | ||
| : | ||
| else | ||
| ax_pthread_ok=no | ||
| $2 | ||
| fi | ||
| AC_LANG_RESTORE | ||
| ])dnl AX_PTHREAD |
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