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# ===========================================================================# http://www.gnu.org/software/autoconf-archive/ax_pthread.html# ===========================================================================## SYNOPSIS## AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])# AX_PTHREAD_CXX([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.)## 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# $CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS## If you are only building threads programs, you may wish to use these# variables in your default LIBS, CFLAGS:## LIBS="$PTHREAD_LIBS $LIBS"# CFLAGS="$CFLAGS $PTHREAD_CFLAGS"## 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).## 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.## LICENSE## Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu># Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>## 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 19
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])AC_DEFUN([AX_PTHREAD_ALL], [AC_REQUIRE([AC_CANONICAL_HOST])AS_VAR_SET([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:AS_IF([test ! -z "$PTHREAD_LIBS$PTHREAD_$3"], [ AS_VAR_COPY([save_$3], [$3]) AS_VAR_SET([$3], ["$$3 $PTHREAD_$3"]) AS_VAR_COPY([save_LIBS], [LIBS]) AS_VAR_SET([LIBS], ["$PTHREAD_LIBS $LIBS"]) AC_MSG_CHECKING( [for pthread_join in LIBS=$PTHREAD_LIBS with $3=$PTHREAD_$3]) AC_TRY_LINK_FUNC([pthread_join], [AS_VAR_SET([ax_pthread_ok], [yes])]) AC_MSG_RESULT([$ax_pthread_ok]) AS_IF([test x"$ax_pthread_ok" = xno], [AS_UNSET([PTHREAD_LIBS]) AS_UNSET([PTHREAD_$3])]) AS_VAR_COPY([LIBS], [save_LIBS]) AS_VAR_COPY([$3], [save_$3]) ])
# 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.
AS_VAR_SET([ax_pthread_flags], ["-Kthread -kthread lthread -pthread -pthreads -mt -mthreads --thread-safe pthread-config pthreads pthread"])
# The ordering *is* (sometimes) important. Some notes on the# individual items follow:
# none: in case threads are in libc; should be tried before -Kthread and# other compiler flags to prevent continual compiler warnings;# none will prepended at OS modifications below# -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# -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# -mthreads: Mingw32/gcc, Lynx/gcc# --thread-safe: KAI C++# pthread-config: use pthread-config program (for GNU Pth library)# pthread: Linux, etcetera# pthreads: AIX (very old gcc's on AIX must check this before -lpthread,# handled below)
AS_CASE([${host_os}], [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: AS_VAR_SET([ax_pthread_flags], ["-mt -pthread $ax_pthread_flags"]) AS_IF([test "x$GCC" = "xyes"], [AS_VAR_SET([ax_pthread_flags], ["-pthreads pthread -pthread $ax_pthread_flags"])])],
[darwin*], [AS_VAR_SET([ax_pthread_flags], ["-pthread $ax_pthread_flags"])],
[hp-ux*], [# On HP-UX compiling with aCC, cc understands -mthreads as # '-mt' '-hreads' ..., the test succeeds but it fails to run. AS_IF([test x"$GCC" != xyes], [AS_VAR_SET([ax_pthread_flags], ["-mt $ax_pthread_flags"])])])
AS_VAR_SET([ax_pthread_flags], ["none $ax_pthread_flags"])
AS_IF([test x"$ax_pthread_ok" = xno], [ for flag in $ax_pthread_flags; do AS_CASE([$flag], [none], [AC_MSG_CHECKING([whether pthreads work without any flags])],
[-*], [AC_MSG_CHECKING([whether pthreads work with $flag]) AS_VAR_COPY([PTHREAD_$3], [flag])],
[pthread-config], [AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) AS_IF([test x"$ax_pthread_config" = xno], [continue]) AS_VAR_SET([PTHREAD_$3], ["`pthread-config --cflags`"]) AS_VAR_SET([PTHREAD_LIBS], ["`pthread-config --ldflags` `pthread-config --libs`"])],
[AC_MSG_CHECKING([for the pthreads library -l$flag]) AS_VAR_SET([PTHREAD_LIBS], ["-l$flag"])])
AS_VAR_COPY([save_LIBS], [LIBS]) AS_VAR_COPY([save_$3], [$3]) AS_VAR_SET([LIBS], ["$PTHREAD_LIBS $LIBS"]) AS_VAR_SET([$3], ["$$3 $PTHREAD_$3"])
# 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_LINK_IFELSE([AC_LANG_PROGRAM([[#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) /* ; */]])], [AS_VAR_SET([ax_pthread_ok], [yes])], [])
AS_VAR_COPY([LIBS], [save_LIBS]) AS_VAR_COPY([$3], [save_$3])
AC_MSG_RESULT([$ax_pthread_ok]) AS_IF([test "x$ax_pthread_ok" = xyes], [break])
AS_UNSET([PTHREAD_LIBS]) AS_UNSET([PTHREAD_$3]) done])
# Various other checks:AS_IF([test "x$ax_pthread_ok" = xyes], [ AS_VAR_COPY([save_LIBS], [LIBS]) AS_VAR_SET([LIBS], ["$PTHREAD_LIBS $LIBS"]) AS_VAR_COPY([save_$3], [$3]) AS_VAR_SET([$3], ["$$3 $PTHREAD_$3"])
# Detect AIX lossage: JOINABLE attribute is called UNDETACHED. AC_MSG_CHECKING([for joinable pthread attribute]) AS_VAR_SET([attr_name], [unknown]) for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do AC_LINK_IFELSE( [AC_LANG_PROGRAM([[#include <pthread.h> ]], [[int attr = $attr; return attr /* ; */]])], [AS_VAR_SET([attr_name], [$attr]) break], []) done AC_MSG_RESULT([$attr_name]) AS_IF([test "$attr_name" != PTHREAD_CREATE_JOINABLE], [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name], [Define to necessary symbol if this constant uses a non-standard name on your system.])])
AC_MSG_CHECKING([if more special flags are required for pthreads]) AS_VAR_SET([flag], [no]) AS_CASE([${host_os}], [aix* | freebsd* | darwin*], [AS_VAR_SET([flag], ["-D_THREAD_SAFE"])],
[osf* | hpux*], [AS_VAR_SET([flag], ["-D_REENTRANT"])],
[solaris*], [AS_IF([test "$GCC" = "yes"], [AS_VAR_SET([flag], ["-D_REENTRANT"])], [AS_VAR_SET([flag], ["-mt -D_REENTRANT"])])])
AC_MSG_RESULT(${flag}) AS_IF([test "x$flag" != xno], [AS_VAR_SET([PTHREAD_$3], ["$flag $PTHREAD_$3"])])
AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], [ax_cv_PTHREAD_PRIO_INHERIT], [ AC_LINK_IFELSE([ AC_LANG_PROGRAM([[#include <pthread.h> ]], [[int i = PTHREAD_PRIO_INHERIT;]])], [ax_cv_PTHREAD_PRIO_INHERIT=yes], [ax_cv_PTHREAD_PRIO_INHERIT=no])]) AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.])])
AS_VAR_COPY([LIBS], [save_LIBS]) AS_VAR_COPY([$3], [save_$3])])
AC_SUBST([PTHREAD_LIBS])AC_SUBST([PTHREAD_$3])
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:AS_IF([test x"$ax_pthread_ok" = xyes], [ifelse([$1], [], [AC_DEFINE([HAVE_PTHREAD], [1], [Define if you have POSIX threads libraries and header files.])], $1)], [AS_VAR_SET([ax_pthread_ok], [no])] $2)])dnl AX_PTHREAD_ALL
AC_DEFUN([AX_PTHREAD_CXX],[dnl AC_LANG_PUSH([C++]) AX_PTHREAD_ALL([$1], [$2], [CXXFLAGS]) AC_LANG_POP([C++])])
AC_DEFUN([AX_PTHREAD],[dnl AC_LANG_PUSH([C]) AX_PTHREAD_ALL([$1], [$2], [CFLAGS]) AC_LANG_POP([C])])
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