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schoenebeck |
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dnl Copyright © 2007 Steven G. Johnson <stevenj@alum.mit.edu> |
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dnl |
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dnl This program is free software: you can redistribute it and/or modify it |
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dnl under the terms of the GNU General Public License as published by the |
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dnl Free Software Foundation, either version 3 of the License, or (at your |
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dnl option) any later version. |
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dnl |
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dnl This program is distributed in the hope that it will be useful, but |
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of |
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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dnl General Public License for more details. |
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dnl |
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dnl You should have received a copy of the GNU General Public License along |
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dnl with this program. If not, see <http://www.gnu.org/licenses/>. |
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dnl |
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dnl As a special exception, the respective Autoconf Macro's copyright owner |
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dnl gives unlimited permission to copy, distribute and modify the configure |
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dnl scripts that are the output of Autoconf when processing the Macro. You |
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dnl need not follow the terms of the GNU General Public License when using |
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dnl or distributing such scripts, even though portions of the text of the |
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dnl Macro appear in them. The GNU General Public License (GPL) does govern |
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dnl all other use of the material that constitutes the Autoconf Macro. |
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dnl |
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dnl This special exception to the GPL applies to versions of the Autoconf |
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dnl Macro released by the Autoconf Macro Archive. When you make and |
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dnl distribute a modified version of the Autoconf Macro, you may extend |
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dnl this special exception to the GPL to apply to your modified version as |
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dnl well. |
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dnl |
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dnl ----------------------------------------------------------------------- |
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dnl |
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dnl Synopsis: ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
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dnl |
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dnl |
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dnl This macro figures out how to build C programs using POSIX threads. It |
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dnl sets the PTHREAD_LIBS output variable to the threads library and linker |
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dnl flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
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dnl flags that are needed. (The user can also force certain compiler |
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dnl flags/libs to be tested by setting these environment variables.) |
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dnl |
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dnl Also sets PTHREAD_CC to any special C compiler that is needed for |
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dnl multi-threaded programs (defaults to the value of CC otherwise). (This |
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dnl is necessary on AIX to use the special cc_r compiler alias.) |
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dnl |
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dnl NOTE: You are assumed to not only compile your program with these |
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dnl flags, but also link it with them as well. e.g. you should link with |
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dnl $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
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dnl |
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dnl If you are only building threads programs, you may wish to use these |
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dnl variables in your default LIBS, CFLAGS, and CC: |
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dnl |
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dnl LIBS="$PTHREAD_LIBS $LIBS" |
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dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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dnl CC="$PTHREAD_CC" |
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dnl |
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dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant |
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dnl has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name |
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dnl (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
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dnl |
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dnl ACTION-IF-FOUND is a list of shell commands to run if a threads library |
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dnl is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
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dnl is not found. If ACTION-IF-FOUND is not specified, the default action |
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dnl will define HAVE_PTHREAD. |
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dnl |
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dnl Please let the authors know if this macro fails on any platform, or if |
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dnl you have any other suggestions or comments. This macro was based on |
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dnl work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with |
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dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros posted |
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dnl by Alejandro Forero Cuervo to the autoconf macro repository. We are also |
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dnl grateful for the helpful feedback of numerous users. |
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dnl |
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dnl ----------------------------------------------------------------------- |
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dnl |
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AC_DEFUN([ACX_PTHREAD], [ |
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AC_REQUIRE([AC_CANONICAL_HOST]) |
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AC_LANG_SAVE |
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AC_LANG_C |
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acx_pthread_ok=no |
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# We used to check for pthread.h first, but this fails if pthread.h |
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# requires special compiler flags (e.g. on True64 or Sequent). |
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# It gets checked for in the link test anyway. |
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# First of all, check if the user has set any of the PTHREAD_LIBS, |
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# etcetera environment variables, and if threads linking works using |
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# them: |
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if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
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save_CFLAGS="$CFLAGS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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save_LIBS="$LIBS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
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AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) |
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AC_MSG_RESULT($acx_pthread_ok) |
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if test x"$acx_pthread_ok" = xno; then |
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PTHREAD_LIBS="" |
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PTHREAD_CFLAGS="" |
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fi |
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LIBS="$save_LIBS" |
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CFLAGS="$save_CFLAGS" |
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fi |
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# We must check for the threads library under a number of different |
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# names; the ordering is very important because some systems |
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# (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
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# libraries is broken (non-POSIX). |
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# Create a list of thread flags to try. Items starting with a "-" are |
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# C compiler flags, and other items are library names, except for "none" |
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# which indicates that we try without any flags at all, and "pthread-config" |
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# which is a program returning the flags for the Pth emulation library. |
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acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
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# The ordering *is* (sometimes) important. Some notes on the |
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# individual items follow: |
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# pthreads: AIX (must check this before -lpthread) |
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# none: in case threads are in libc; should be tried before -Kthread and |
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# other compiler flags to prevent continual compiler warnings |
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# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
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# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
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# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
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# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
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# -pthreads: Solaris/gcc |
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# -mthreads: Mingw32/gcc, Lynx/gcc |
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# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
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# doesn't hurt to check since this sometimes defines pthreads too; |
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# also defines -D_REENTRANT) |
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# ... -mt is also the pthreads flag for HP/aCC |
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# pthread: Linux, etcetera |
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# --thread-safe: KAI C++ |
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# pthread-config: use pthread-config program (for GNU Pth library) |
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case "${host_cpu}-${host_os}" in |
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*solaris*) |
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# On Solaris (at least, for some versions), libc contains stubbed |
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# (non-functional) versions of the pthreads routines, so link-based |
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# tests will erroneously succeed. (We need to link with -pthreads/-mt/ |
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# -lpthread.) (The stubs are missing pthread_cleanup_push, or rather |
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# a function called by this macro, so we could check for that, but |
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# who knows whether they'll stub that too in a future libc.) So, |
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# we'll just look for -pthreads and -lpthread first: |
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acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" |
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;; |
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esac |
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if test x"$acx_pthread_ok" = xno; then |
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for flag in $acx_pthread_flags; do |
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case $flag in |
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none) |
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AC_MSG_CHECKING([whether pthreads work without any flags]) |
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;; |
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-*) |
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AC_MSG_CHECKING([whether pthreads work with $flag]) |
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PTHREAD_CFLAGS="$flag" |
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;; |
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pthread-config) |
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AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) |
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if test x"$acx_pthread_config" = xno; then continue; fi |
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PTHREAD_CFLAGS="`pthread-config --cflags`" |
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PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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;; |
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*) |
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AC_MSG_CHECKING([for the pthreads library -l$flag]) |
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PTHREAD_LIBS="-l$flag" |
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;; |
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esac |
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save_LIBS="$LIBS" |
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save_CFLAGS="$CFLAGS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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# Check for various functions. We must include pthread.h, |
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# since some functions may be macros. (On the Sequent, we |
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# need a special flag -Kthread to make this header compile.) |
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# We check for pthread_join because it is in -lpthread on IRIX |
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# while pthread_create is in libc. We check for pthread_attr_init |
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# due to DEC craziness with -lpthreads. We check for |
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# pthread_cleanup_push because it is one of the few pthread |
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# functions on Solaris that doesn't have a non-functional libc stub. |
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# We try pthread_create on general principles. |
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AC_TRY_LINK([#include <pthread.h>], |
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[pthread_t th; pthread_join(th, 0); |
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pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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[acx_pthread_ok=yes]) |
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LIBS="$save_LIBS" |
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CFLAGS="$save_CFLAGS" |
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AC_MSG_RESULT($acx_pthread_ok) |
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if test "x$acx_pthread_ok" = xyes; then |
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break; |
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fi |
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PTHREAD_LIBS="" |
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PTHREAD_CFLAGS="" |
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done |
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fi |
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# Various other checks: |
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if test "x$acx_pthread_ok" = xyes; then |
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save_LIBS="$LIBS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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save_CFLAGS="$CFLAGS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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# Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
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AC_MSG_CHECKING([for joinable pthread attribute]) |
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attr_name=unknown |
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for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], |
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[attr_name=$attr; break]) |
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done |
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AC_MSG_RESULT($attr_name) |
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if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
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AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, |
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[Define to necessary symbol if this constant |
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uses a non-standard name on your system.]) |
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fi |
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AC_MSG_CHECKING([if more special flags are required for pthreads]) |
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flag=no |
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case "${host_cpu}-${host_os}" in |
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*-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; |
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*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; |
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esac |
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AC_MSG_RESULT(${flag}) |
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if test "x$flag" != xno; then |
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PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
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fi |
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LIBS="$save_LIBS" |
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CFLAGS="$save_CFLAGS" |
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# More AIX lossage: must compile with xlc_r or cc_r |
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if test x"$GCC" != xyes; then |
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AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) |
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else |
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PTHREAD_CC=$CC |
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fi |
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else |
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PTHREAD_CC="$CC" |
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fi |
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AC_SUBST(PTHREAD_LIBS) |
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AC_SUBST(PTHREAD_CFLAGS) |
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AC_SUBST(PTHREAD_CC) |
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# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
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if test x"$acx_pthread_ok" = xyes; then |
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ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) |
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: |
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else |
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acx_pthread_ok=no |
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$2 |
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fi |
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AC_LANG_RESTORE |
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])dnl ACX_PTHREAD |
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