485 lines
20 KiB
485 lines
20 KiB
# =========================================================================== |
|
# 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 to link with them as well. For example, you might link with |
|
# $PTHREAD_CC $CFLAGS $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 $PTHREAD_CFLAGS" |
|
# CC="$PTHREAD_CC" |
|
# |
|
# 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. |
|
# |
|
# 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 23 |
|
|
|
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) |
|
AC_DEFUN([AX_PTHREAD], [ |
|
AC_REQUIRE([AC_CANONICAL_HOST]) |
|
AC_REQUIRE([AC_PROG_CC]) |
|
AC_REQUIRE([AC_PROG_SED]) |
|
AC_LANG_PUSH([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 Tru64 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$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then |
|
ax_pthread_save_CC="$CC" |
|
ax_pthread_save_CFLAGS="$CFLAGS" |
|
ax_pthread_save_LIBS="$LIBS" |
|
AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"]) |
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
|
LIBS="$PTHREAD_LIBS $LIBS" |
|
AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS]) |
|
AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes]) |
|
AC_MSG_RESULT([$ax_pthread_ok]) |
|
if test "x$ax_pthread_ok" = "xno"; then |
|
PTHREAD_LIBS="" |
|
PTHREAD_CFLAGS="" |
|
fi |
|
CC="$ax_pthread_save_CC" |
|
CFLAGS="$ax_pthread_save_CFLAGS" |
|
LIBS="$ax_pthread_save_LIBS" |
|
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 -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) |
|
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64 |
|
# (Note: HP C rejects this with "bad form for `-t' option") |
|
# -pthreads: Solaris/gcc (Note: HP C also rejects) |
|
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
|
# doesn't hurt to check since this sometimes defines pthreads and |
|
# -D_REENTRANT too), HP C (must be checked before -lpthread, which |
|
# is present but should not be used directly; and before -mthreads, |
|
# because the compiler interprets this as "-mt" + "-hreads") |
|
# -mthreads: Mingw32/gcc, Lynx/gcc |
|
# pthread: Linux, etcetera |
|
# --thread-safe: KAI C++ |
|
# pthread-config: use pthread-config program (for GNU Pth library) |
|
|
|
case $host_os in |
|
|
|
freebsd*) |
|
|
|
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
|
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
|
|
|
ax_pthread_flags="-kthread lthread $ax_pthread_flags" |
|
;; |
|
|
|
hpux*) |
|
|
|
# From the cc(1) man page: "[-mt] Sets various -D flags to enable |
|
# multi-threading and also sets -lpthread." |
|
|
|
ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags" |
|
;; |
|
|
|
openedition*) |
|
|
|
# IBM z/OS requires a feature-test macro to be defined in order to |
|
# enable POSIX threads at all, so give the user a hint if this is |
|
# not set. (We don't define these ourselves, as they can affect |
|
# other portions of the system API in unpredictable ways.) |
|
|
|
AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING], |
|
[ |
|
# if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS) |
|
AX_PTHREAD_ZOS_MISSING |
|
# endif |
|
], |
|
[AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])]) |
|
;; |
|
|
|
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. (N.B.: 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 check first for the |
|
# standard Solaris way of linking pthreads (-mt -lpthread). |
|
|
|
ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags" |
|
;; |
|
esac |
|
|
|
# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC) |
|
|
|
AS_IF([test "x$GCC" = "xyes"], |
|
[ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"]) |
|
|
|
# The presence of a feature test macro requesting re-entrant function |
|
# definitions is, on some systems, a strong hint that pthreads support is |
|
# correctly enabled |
|
|
|
case $host_os in |
|
darwin* | hpux* | linux* | osf* | solaris*) |
|
ax_pthread_check_macro="_REENTRANT" |
|
;; |
|
|
|
aix*) |
|
ax_pthread_check_macro="_THREAD_SAFE" |
|
;; |
|
|
|
*) |
|
ax_pthread_check_macro="--" |
|
;; |
|
esac |
|
AS_IF([test "x$ax_pthread_check_macro" = "x--"], |
|
[ax_pthread_check_cond=0], |
|
[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"]) |
|
|
|
# Are we compiling with Clang? |
|
|
|
AC_CACHE_CHECK([whether $CC is Clang], |
|
[ax_cv_PTHREAD_CLANG], |
|
[ax_cv_PTHREAD_CLANG=no |
|
# Note that Autoconf sets GCC=yes for Clang as well as GCC |
|
if test "x$GCC" = "xyes"; then |
|
AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG], |
|
[/* Note: Clang 2.7 lacks __clang_[a-z]+__ */ |
|
# if defined(__clang__) && defined(__llvm__) |
|
AX_PTHREAD_CC_IS_CLANG |
|
# endif |
|
], |
|
[ax_cv_PTHREAD_CLANG=yes]) |
|
fi |
|
]) |
|
ax_pthread_clang="$ax_cv_PTHREAD_CLANG" |
|
|
|
ax_pthread_clang_warning=no |
|
|
|
# Clang needs special handling, because older versions handle the -pthread |
|
# option in a rather... idiosyncratic way |
|
|
|
if test "x$ax_pthread_clang" = "xyes"; then |
|
|
|
# Clang takes -pthread; it has never supported any other flag |
|
|
|
# (Note 1: This will need to be revisited if a system that Clang |
|
# supports has POSIX threads in a separate library. This tends not |
|
# to be the way of modern systems, but it's conceivable.) |
|
|
|
# (Note 2: On some systems, notably Darwin, -pthread is not needed |
|
# to get POSIX threads support; the API is always present and |
|
# active. We could reasonably leave PTHREAD_CFLAGS empty. But |
|
# -pthread does define _REENTRANT, and while the Darwin headers |
|
# ignore this macro, third-party headers might not.) |
|
|
|
PTHREAD_CFLAGS="-pthread" |
|
PTHREAD_LIBS= |
|
|
|
ax_pthread_ok=yes |
|
|
|
# However, older versions of Clang make a point of warning the user |
|
# that, in an invocation where only linking and no compilation is |
|
# taking place, the -pthread option has no effect ("argument unused |
|
# during compilation"). They expect -pthread to be passed in only |
|
# when source code is being compiled. |
|
# |
|
# Problem is, this is at odds with the way Automake and most other |
|
# C build frameworks function, which is that the same flags used in |
|
# compilation (CFLAGS) are also used in linking. Many systems |
|
# supported by AX_PTHREAD require exactly this for POSIX threads |
|
# support, and in fact it is often not straightforward to specify a |
|
# flag that is used only in the compilation phase and not in |
|
# linking. Such a scenario is extremely rare in practice. |
|
# |
|
# Even though use of the -pthread flag in linking would only print |
|
# a warning, this can be a nuisance for well-run software projects |
|
# that build with -Werror. So if the active version of Clang has |
|
# this misfeature, we search for an option to squash it. |
|
|
|
AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread], |
|
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG], |
|
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown |
|
# Create an alternate version of $ac_link that compiles and |
|
# links in two steps (.c -> .o, .o -> exe) instead of one |
|
# (.c -> exe), because the warning occurs only in the second |
|
# step |
|
ax_pthread_save_ac_link="$ac_link" |
|
ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g' |
|
ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"` |
|
ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)" |
|
ax_pthread_save_CFLAGS="$CFLAGS" |
|
for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do |
|
AS_IF([test "x$ax_pthread_try" = "xunknown"], [break]) |
|
CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS" |
|
ac_link="$ax_pthread_save_ac_link" |
|
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
|
[ac_link="$ax_pthread_2step_ac_link" |
|
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
|
[break]) |
|
]) |
|
done |
|
ac_link="$ax_pthread_save_ac_link" |
|
CFLAGS="$ax_pthread_save_CFLAGS" |
|
AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no]) |
|
ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try" |
|
]) |
|
|
|
case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in |
|
no | unknown) ;; |
|
*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;; |
|
esac |
|
|
|
fi # $ax_pthread_clang = yes |
|
|
|
if test "x$ax_pthread_ok" = "xno"; then |
|
for ax_pthread_try_flag in $ax_pthread_flags; do |
|
|
|
case $ax_pthread_try_flag in |
|
none) |
|
AC_MSG_CHECKING([whether pthreads work without any flags]) |
|
;; |
|
|
|
-mt,pthread) |
|
AC_MSG_CHECKING([whether pthreads work with -mt -lpthread]) |
|
PTHREAD_CFLAGS="-mt" |
|
PTHREAD_LIBS="-lpthread" |
|
;; |
|
|
|
-*) |
|
AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) |
|
PTHREAD_CFLAGS="$ax_pthread_try_flag" |
|
;; |
|
|
|
pthread-config) |
|
AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) |
|
AS_IF([test "x$ax_pthread_config" = "xno"], [continue]) |
|
PTHREAD_CFLAGS="`pthread-config --cflags`" |
|
PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
|
;; |
|
|
|
*) |
|
AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag]) |
|
PTHREAD_LIBS="-l$ax_pthread_try_flag" |
|
;; |
|
esac |
|
|
|
ax_pthread_save_CFLAGS="$CFLAGS" |
|
ax_pthread_save_LIBS="$LIBS" |
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
|
LIBS="$PTHREAD_LIBS $LIBS" |
|
|
|
# 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> |
|
# if $ax_pthread_check_cond |
|
# error "$ax_pthread_check_macro must be defined" |
|
# endif |
|
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], |
|
[]) |
|
|
|
CFLAGS="$ax_pthread_save_CFLAGS" |
|
LIBS="$ax_pthread_save_LIBS" |
|
|
|
AC_MSG_RESULT([$ax_pthread_ok]) |
|
AS_IF([test "x$ax_pthread_ok" = "xyes"], [break]) |
|
|
|
PTHREAD_LIBS="" |
|
PTHREAD_CFLAGS="" |
|
done |
|
fi |
|
|
|
# Various other checks: |
|
if test "x$ax_pthread_ok" = "xyes"; then |
|
ax_pthread_save_CFLAGS="$CFLAGS" |
|
ax_pthread_save_LIBS="$LIBS" |
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
|
LIBS="$PTHREAD_LIBS $LIBS" |
|
|
|
# Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
|
AC_CACHE_CHECK([for joinable pthread attribute], |
|
[ax_cv_PTHREAD_JOINABLE_ATTR], |
|
[ax_cv_PTHREAD_JOINABLE_ATTR=unknown |
|
for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
|
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], |
|
[int attr = $ax_pthread_attr; return attr /* ; */])], |
|
[ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break], |
|
[]) |
|
done |
|
]) |
|
AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \ |
|
test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \ |
|
test "x$ax_pthread_joinable_attr_defined" != "xyes"], |
|
[AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], |
|
[$ax_cv_PTHREAD_JOINABLE_ATTR], |
|
[Define to necessary symbol if this constant |
|
uses a non-standard name on your system.]) |
|
ax_pthread_joinable_attr_defined=yes |
|
]) |
|
|
|
AC_CACHE_CHECK([whether more special flags are required for pthreads], |
|
[ax_cv_PTHREAD_SPECIAL_FLAGS], |
|
[ax_cv_PTHREAD_SPECIAL_FLAGS=no |
|
case $host_os in |
|
solaris*) |
|
ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS" |
|
;; |
|
esac |
|
]) |
|
AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ |
|
test "x$ax_pthread_special_flags_added" != "xyes"], |
|
[PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" |
|
ax_pthread_special_flags_added=yes]) |
|
|
|
AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], |
|
[ax_cv_PTHREAD_PRIO_INHERIT], |
|
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], |
|
[[int i = PTHREAD_PRIO_INHERIT;]])], |
|
[ax_cv_PTHREAD_PRIO_INHERIT=yes], |
|
[ax_cv_PTHREAD_PRIO_INHERIT=no]) |
|
]) |
|
AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \ |
|
test "x$ax_pthread_prio_inherit_defined" != "xyes"], |
|
[AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.]) |
|
ax_pthread_prio_inherit_defined=yes |
|
]) |
|
|
|
CFLAGS="$ax_pthread_save_CFLAGS" |
|
LIBS="$ax_pthread_save_LIBS" |
|
|
|
# More AIX lossage: compile with *_r variant |
|
if test "x$GCC" != "xyes"; then |
|
case $host_os in |
|
aix*) |
|
AS_CASE(["x/$CC"], |
|
[x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], |
|
[#handle absolute path differently from PATH based program lookup |
|
AS_CASE(["x$CC"], |
|
[x/*], |
|
[AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], |
|
[AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) |
|
;; |
|
esac |
|
fi |
|
fi |
|
|
|
test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" |
|
|
|
AC_SUBST([PTHREAD_LIBS]) |
|
AC_SUBST([PTHREAD_CFLAGS]) |
|
AC_SUBST([PTHREAD_CC]) |
|
|
|
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
|
if test "x$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_POP |
|
])dnl AX_PTHREAD
|
|
|