adam@1528: # ===========================================================================
adam@1528: #        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
adam@1528: # ===========================================================================
adam@1528: #
adam@1528: # SYNOPSIS
adam@1528: #
adam@1528: #   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
adam@1528: #
adam@1528: # DESCRIPTION
adam@1528: #
adam@1528: #   This macro figures out how to build C programs using POSIX threads. It
adam@1528: #   sets the PTHREAD_LIBS output variable to the threads library and linker
adam@1528: #   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
adam@1528: #   flags that are needed. (The user can also force certain compiler
adam@1528: #   flags/libs to be tested by setting these environment variables.)
adam@1528: #
adam@1528: #   Also sets PTHREAD_CC to any special C compiler that is needed for
adam@1528: #   multi-threaded programs (defaults to the value of CC otherwise). (This
adam@1528: #   is necessary on AIX to use the special cc_r compiler alias.)
adam@1528: #
adam@1528: #   NOTE: You are assumed to not only compile your program with these flags,
adam@1528: #   but also link it with them as well. e.g. you should link with
adam@1528: #   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
adam@1528: #
adam@1528: #   If you are only building threads programs, you may wish to use these
adam@1528: #   variables in your default LIBS, CFLAGS, and CC:
adam@1528: #
adam@1528: #     LIBS="$PTHREAD_LIBS $LIBS"
adam@1528: #     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528: #     CC="$PTHREAD_CC"
adam@1528: #
adam@1528: #   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
adam@1528: #   has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
adam@1528: #   (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
adam@1528: #
adam@1528: #   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
adam@1528: #   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
adam@1528: #   PTHREAD_CFLAGS.
adam@1528: #
adam@1528: #   ACTION-IF-FOUND is a list of shell commands to run if a threads library
adam@1528: #   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
adam@1528: #   is not found. If ACTION-IF-FOUND is not specified, the default action
adam@1528: #   will define HAVE_PTHREAD.
adam@1528: #
adam@1528: #   Please let the authors know if this macro fails on any platform, or if
adam@1528: #   you have any other suggestions or comments. This macro was based on work
adam@1528: #   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
adam@1528: #   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
adam@1528: #   Alejandro Forero Cuervo to the autoconf macro repository. We are also
adam@1528: #   grateful for the helpful feedback of numerous users.
adam@1528: #
adam@1528: #   Updated for Autoconf 2.68 by Daniel Richard G.
adam@1528: #
adam@1528: # LICENSE
adam@1528: #
adam@1528: #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
adam@1528: #   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
adam@1528: #
adam@1528: #   This program is free software: you can redistribute it and/or modify it
adam@1528: #   under the terms of the GNU General Public License as published by the
adam@1528: #   Free Software Foundation, either version 3 of the License, or (at your
adam@1528: #   option) any later version.
adam@1528: #
adam@1528: #   This program is distributed in the hope that it will be useful, but
adam@1528: #   WITHOUT ANY WARRANTY; without even the implied warranty of
adam@1528: #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
adam@1528: #   Public License for more details.
adam@1528: #
adam@1528: #   You should have received a copy of the GNU General Public License along
adam@1528: #   with this program. If not, see <http://www.gnu.org/licenses/>.
adam@1528: #
adam@1528: #   As a special exception, the respective Autoconf Macro's copyright owner
adam@1528: #   gives unlimited permission to copy, distribute and modify the configure
adam@1528: #   scripts that are the output of Autoconf when processing the Macro. You
adam@1528: #   need not follow the terms of the GNU General Public License when using
adam@1528: #   or distributing such scripts, even though portions of the text of the
adam@1528: #   Macro appear in them. The GNU General Public License (GPL) does govern
adam@1528: #   all other use of the material that constitutes the Autoconf Macro.
adam@1528: #
adam@1528: #   This special exception to the GPL applies to versions of the Autoconf
adam@1528: #   Macro released by the Autoconf Archive. When you make and distribute a
adam@1528: #   modified version of the Autoconf Macro, you may extend this special
adam@1528: #   exception to the GPL to apply to your modified version as well.
adam@1528: 
adam@1528: #serial 16
adam@1528: 
adam@1528: AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
adam@1528: AC_DEFUN([AX_PTHREAD], [
adam@1528: AC_REQUIRE([AC_CANONICAL_HOST])
adam@1528: AC_LANG_PUSH([C])
adam@1528: ax_pthread_ok=no
adam@1528: 
adam@1528: # We used to check for pthread.h first, but this fails if pthread.h
adam@1528: # requires special compiler flags (e.g. on True64 or Sequent).
adam@1528: # It gets checked for in the link test anyway.
adam@1528: 
adam@1528: # First of all, check if the user has set any of the PTHREAD_LIBS,
adam@1528: # etcetera environment variables, and if threads linking works using
adam@1528: # them:
adam@1528: if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
adam@1528:         save_CFLAGS="$CFLAGS"
adam@1528:         CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528:         save_LIBS="$LIBS"
adam@1528:         LIBS="$PTHREAD_LIBS $LIBS"
adam@1528:         AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
adam@1528:         AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes)
adam@1528:         AC_MSG_RESULT($ax_pthread_ok)
adam@1528:         if test x"$ax_pthread_ok" = xno; then
adam@1528:                 PTHREAD_LIBS=""
adam@1528:                 PTHREAD_CFLAGS=""
adam@1528:         fi
adam@1528:         LIBS="$save_LIBS"
adam@1528:         CFLAGS="$save_CFLAGS"
adam@1528: fi
adam@1528: 
adam@1528: # We must check for the threads library under a number of different
adam@1528: # names; the ordering is very important because some systems
adam@1528: # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
adam@1528: # libraries is broken (non-POSIX).
adam@1528: 
adam@1528: # Create a list of thread flags to try.  Items starting with a "-" are
adam@1528: # C compiler flags, and other items are library names, except for "none"
adam@1528: # which indicates that we try without any flags at all, and "pthread-config"
adam@1528: # which is a program returning the flags for the Pth emulation library.
adam@1528: 
adam@1528: ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
adam@1528: 
adam@1528: # The ordering *is* (sometimes) important.  Some notes on the
adam@1528: # individual items follow:
adam@1528: 
adam@1528: # pthreads: AIX (must check this before -lpthread)
adam@1528: # none: in case threads are in libc; should be tried before -Kthread and
adam@1528: #       other compiler flags to prevent continual compiler warnings
adam@1528: # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
adam@1528: # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
adam@1528: # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
adam@1528: # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
adam@1528: # -pthreads: Solaris/gcc
adam@1528: # -mthreads: Mingw32/gcc, Lynx/gcc
adam@1528: # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
adam@1528: #      doesn't hurt to check since this sometimes defines pthreads too;
adam@1528: #      also defines -D_REENTRANT)
adam@1528: #      ... -mt is also the pthreads flag for HP/aCC
adam@1528: # pthread: Linux, etcetera
adam@1528: # --thread-safe: KAI C++
adam@1528: # pthread-config: use pthread-config program (for GNU Pth library)
adam@1528: 
adam@1528: case "${host_cpu}-${host_os}" in
adam@1528:         *solaris*)
adam@1528: 
adam@1528:         # On Solaris (at least, for some versions), libc contains stubbed
adam@1528:         # (non-functional) versions of the pthreads routines, so link-based
adam@1528:         # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
adam@1528:         # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
adam@1528:         # a function called by this macro, so we could check for that, but
adam@1528:         # who knows whether they'll stub that too in a future libc.)  So,
adam@1528:         # we'll just look for -pthreads and -lpthread first:
adam@1528: 
adam@1528:         ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
adam@1528:         ;;
adam@1528: 
adam@1528:         *-darwin*)
adam@1528:         ax_pthread_flags="-pthread $ax_pthread_flags"
adam@1528:         ;;
adam@1528: esac
adam@1528: 
adam@1528: if test x"$ax_pthread_ok" = xno; then
adam@1528: for flag in $ax_pthread_flags; do
adam@1528: 
adam@1528:         case $flag in
adam@1528:                 none)
adam@1528:                 AC_MSG_CHECKING([whether pthreads work without any flags])
adam@1528:                 ;;
adam@1528: 
adam@1528:                 -*)
adam@1528:                 AC_MSG_CHECKING([whether pthreads work with $flag])
adam@1528:                 PTHREAD_CFLAGS="$flag"
adam@1528:                 ;;
adam@1528: 
adam@1528:                 pthread-config)
adam@1528:                 AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no)
adam@1528:                 if test x"$ax_pthread_config" = xno; then continue; fi
adam@1528:                 PTHREAD_CFLAGS="`pthread-config --cflags`"
adam@1528:                 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
adam@1528:                 ;;
adam@1528: 
adam@1528:                 *)
adam@1528:                 AC_MSG_CHECKING([for the pthreads library -l$flag])
adam@1528:                 PTHREAD_LIBS="-l$flag"
adam@1528:                 ;;
adam@1528:         esac
adam@1528: 
adam@1528:         save_LIBS="$LIBS"
adam@1528:         save_CFLAGS="$CFLAGS"
adam@1528:         LIBS="$PTHREAD_LIBS $LIBS"
adam@1528:         CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528: 
adam@1528:         # Check for various functions.  We must include pthread.h,
adam@1528:         # since some functions may be macros.  (On the Sequent, we
adam@1528:         # need a special flag -Kthread to make this header compile.)
adam@1528:         # We check for pthread_join because it is in -lpthread on IRIX
adam@1528:         # while pthread_create is in libc.  We check for pthread_attr_init
adam@1528:         # due to DEC craziness with -lpthreads.  We check for
adam@1528:         # pthread_cleanup_push because it is one of the few pthread
adam@1528:         # functions on Solaris that doesn't have a non-functional libc stub.
adam@1528:         # We try pthread_create on general principles.
adam@1528:         AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
adam@1528:                         static void routine(void *a) { a = 0; }
adam@1528:                         static void *start_routine(void *a) { return a; }],
adam@1528:                        [pthread_t th; pthread_attr_t attr;
adam@1528:                         pthread_create(&th, 0, start_routine, 0);
adam@1528:                         pthread_join(th, 0);
adam@1528:                         pthread_attr_init(&attr);
adam@1528:                         pthread_cleanup_push(routine, 0);
adam@1528:                         pthread_cleanup_pop(0) /* ; */])],
adam@1528:                 [ax_pthread_ok=yes],
adam@1528:                 [])
adam@1528: 
adam@1528:         LIBS="$save_LIBS"
adam@1528:         CFLAGS="$save_CFLAGS"
adam@1528: 
adam@1528:         AC_MSG_RESULT($ax_pthread_ok)
adam@1528:         if test "x$ax_pthread_ok" = xyes; then
adam@1528:                 break;
adam@1528:         fi
adam@1528: 
adam@1528:         PTHREAD_LIBS=""
adam@1528:         PTHREAD_CFLAGS=""
adam@1528: done
adam@1528: fi
adam@1528: 
adam@1528: # Various other checks:
adam@1528: if test "x$ax_pthread_ok" = xyes; then
adam@1528:         save_LIBS="$LIBS"
adam@1528:         LIBS="$PTHREAD_LIBS $LIBS"
adam@1528:         save_CFLAGS="$CFLAGS"
adam@1528:         CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
adam@1528: 
adam@1528:         # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
adam@1528:         AC_MSG_CHECKING([for joinable pthread attribute])
adam@1528:         attr_name=unknown
adam@1528:         for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
adam@1528:             AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
adam@1528:                            [int attr = $attr; return attr /* ; */])],
adam@1528:                 [attr_name=$attr; break],
adam@1528:                 [])
adam@1528:         done
adam@1528:         AC_MSG_RESULT($attr_name)
adam@1528:         if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
adam@1528:             AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
adam@1528:                                [Define to necessary symbol if this constant
adam@1528:                                 uses a non-standard name on your system.])
adam@1528:         fi
adam@1528: 
adam@1528:         AC_MSG_CHECKING([if more special flags are required for pthreads])
adam@1528:         flag=no
adam@1528:         case "${host_cpu}-${host_os}" in
adam@1528:             *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
adam@1528:             *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
adam@1528:         esac
adam@1528:         AC_MSG_RESULT(${flag})
adam@1528:         if test "x$flag" != xno; then
adam@1528:             PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
adam@1528:         fi
adam@1528: 
adam@1528:         AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
adam@1528:             ax_cv_PTHREAD_PRIO_INHERIT, [
adam@1528:                 AC_LINK_IFELSE([
adam@1528:                     AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])],
adam@1528:                     [ax_cv_PTHREAD_PRIO_INHERIT=yes],
adam@1528:                     [ax_cv_PTHREAD_PRIO_INHERIT=no])
adam@1528:             ])
adam@1528:         AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
adam@1528:             AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.]))
adam@1528: 
adam@1528:         LIBS="$save_LIBS"
adam@1528:         CFLAGS="$save_CFLAGS"
adam@1528: 
adam@1528:         # More AIX lossage: must compile with xlc_r or cc_r
adam@1528:         if test x"$GCC" != xyes; then
adam@1528:           AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
adam@1528:         else
adam@1528:           PTHREAD_CC=$CC
adam@1528:         fi
adam@1528: else
adam@1528:         PTHREAD_CC="$CC"
adam@1528: fi
adam@1528: 
adam@1528: AC_SUBST(PTHREAD_LIBS)
adam@1528: AC_SUBST(PTHREAD_CFLAGS)
adam@1528: AC_SUBST(PTHREAD_CC)
adam@1528: 
adam@1528: # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
adam@1528: if test x"$ax_pthread_ok" = xyes; then
adam@1528:         ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
adam@1528:         :
adam@1528: else
adam@1528:         ax_pthread_ok=no
adam@1528:         $2
adam@1528: fi
adam@1528: AC_LANG_POP
adam@1528: ])dnl AX_PTHREAD