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- ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
-
- 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. -
-- Steven G. Johnson <stevenj@alum.mit.edu> -
-- 2008-04-12 -
-
-
-
-AC_DEFUN([ACX_PTHREAD], [
-AC_REQUIRE([AC_CANONICAL_HOST])
-AC_LANG_SAVE
-AC_LANG_C
-acx_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=$PTHREAD_CFLAGS])
- AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
- AC_MSG_RESULT($acx_pthread_ok)
- if test x"$acx_pthread_ok" = xno; then
- PTHREAD_LIBS=""
- PTHREAD_CFLAGS=""
- fi
- LIBS="$save_LIBS"
- CFLAGS="$save_CFLAGS"
-fi
-
-# We must check for the threads library under a number of different
-# names; the ordering is very important because some systems
-# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
-# libraries is broken (non-POSIX).
-
-# Create a list of thread flags to try. Items starting with a "-" are
-# C compiler flags, and other items are library names, except for "none"
-# which indicates that we try without any flags at all, and "pthread-config"
-# which is a program returning the flags for the Pth emulation library.
-
-acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
-
-# The ordering *is* (sometimes) important. Some notes on the
-# individual items follow:
-
-# pthreads: AIX (must check this before -lpthread)
-# none: in case threads are in libc; should be tried before -Kthread and
-# other compiler flags to prevent continual compiler warnings
-# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
-# -pthreads: Solaris/gcc
-# -mthreads: Mingw32/gcc, Lynx/gcc
-# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-# doesn't hurt to check since this sometimes defines pthreads too;
-# also defines -D_REENTRANT)
-# ... -mt is also the pthreads flag for HP/aCC
-# pthread: Linux, etcetera
-# --thread-safe: KAI C++
-# pthread-config: use pthread-config program (for GNU Pth library)
-
-case "${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:
-
- acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
- ;;
-esac
-
-if test x"$acx_pthread_ok" = xno; then
-for flag in $acx_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(acx_pthread_config, pthread-config, yes, no)
- if test x"$acx_pthread_config" = xno; then continue; fi
- PTHREAD_CFLAGS="`pthread-config --cflags`"
- PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
- ;;
-
- *)
- AC_MSG_CHECKING([for the pthreads library -l$flag])
- PTHREAD_LIBS="-l$flag"
- ;;
- esac
-
- save_LIBS="$LIBS"
- save_CFLAGS="$CFLAGS"
- LIBS="$PTHREAD_LIBS $LIBS"
- CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
- # Check for various functions. We must include pthread.h,
- # since some functions may be macros. (On the Sequent, we
- # need a special flag -Kthread to make this header compile.)
- # We check for pthread_join because it is in -lpthread on IRIX
- # while pthread_create is in libc. We check for pthread_attr_init
- # due to DEC craziness with -lpthreads. We check for
- # pthread_cleanup_push because it is one of the few pthread
- # functions on Solaris that doesn't have a non-functional libc stub.
- # We try pthread_create on general principles.
- AC_TRY_LINK([#include <pthread.h>],
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [acx_pthread_ok=yes])
-
- LIBS="$save_LIBS"
- CFLAGS="$save_CFLAGS"
-
- AC_MSG_RESULT($acx_pthread_ok)
- if test "x$acx_pthread_ok" = xyes; then
- break;
- fi
-
- PTHREAD_LIBS=""
- PTHREAD_CFLAGS=""
-done
-fi
-
-# Various other checks:
-if test "x$acx_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="$CC"
-fi
-
-AC_SUBST(PTHREAD_LIBS)
-AC_SUBST(PTHREAD_CFLAGS)
-AC_SUBST(PTHREAD_CC)
-
-# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test x"$acx_pthread_ok" = xyes; then
- ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
- :
-else
- acx_pthread_ok=no
- $2
-fi
-AC_LANG_RESTORE
-])dnl ACX_PTHREAD
-
- - 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 Macro 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. -
-+ Next: ax_python, + Previous: ax_prototype_setsockopt, Up: The Macros +
+AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) ++
+ 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 and PTHREAD_CXX to any special C compiler that is + needed for multi-threaded programs (defaults to the value of CC + respectively CXX otherwise). (This is necessary on e.g. AIX to use the + special cc_r/CC_r compiler alias.) +
++ NOTE: You are assumed to not only compile your program with these flags, + but also to link with them as well. For example, you might link with + $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS + $PTHREAD_CXX $CXXFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS +
++ If you are only building threaded programs, you may wish to use these + variables in your default LIBS, CFLAGS, and CC: +
+LIBS="$PTHREAD_LIBS $LIBS" + CFLAGS="$CFLAGS $PTHREAD_CFLAGS" + CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS" + CC="$PTHREAD_CC" + CXX="$PTHREAD_CXX" ++
+ In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant has a + nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to that name + (e.g. PTHREAD_CREATE_UNDETACHED on AIX). +
++ Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the + PTHREAD_PRIO_INHERIT symbol is defined when compiling with PTHREAD_CFLAGS. +
++ 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. +
++ Updated for Autoconf 2.68 by Daniel Richard G. +
++ Download the + latest version of ax_pthread.m4 or browse + the macro’s revision history. +
+
+ Copyright © 2008 Steven G. Johnson stevenj@alum.mit.edu
+ Copyright © 2011 Daniel Richard G. skunk@iSKUNK.ORG
+ Copyright © 2019 Marc Stevens marc.stevens@cwi.nl
+
+ 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 <https://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. +
++ Next: ax_python, Previous: ax_prototype_setsockopt, Up: The Macros +
+