rculfhash: Include rculfhash-internal.h from local directory
[urcu.git] / m4 / ax_pthread.m4
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074c3a1b 1# ===========================================================================
8ca861a5 2# https://www.gnu.org/software/autoconf-archive/ax_pthread.html
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3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
8#
9# DESCRIPTION
10#
11# This macro figures out how to build C programs using POSIX threads. It
12# sets the PTHREAD_LIBS output variable to the threads library and linker
13# flags, and the PTHREAD_CFLAGS output variable to any special C compiler
14# flags that are needed. (The user can also force certain compiler
15# flags/libs to be tested by setting these environment variables.)
16#
17# Also sets PTHREAD_CC to any special C compiler that is needed for
18# multi-threaded programs (defaults to the value of CC otherwise). (This
19# is necessary on AIX to use the special cc_r compiler alias.)
20#
21# NOTE: You are assumed to not only compile your program with these flags,
7be759d1 22# but also to link with them as well. For example, you might link with
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23# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
24#
7be759d1 25# If you are only building threaded programs, you may wish to use these
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26# variables in your default LIBS, CFLAGS, and CC:
27#
28# LIBS="$PTHREAD_LIBS $LIBS"
29# CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
30# CC="$PTHREAD_CC"
31#
32# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
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33# has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
34# that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
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35#
36# Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
37# PTHREAD_PRIO_INHERIT symbol is defined when compiling with
38# PTHREAD_CFLAGS.
39#
40# ACTION-IF-FOUND is a list of shell commands to run if a threads library
41# is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
42# is not found. If ACTION-IF-FOUND is not specified, the default action
43# will define HAVE_PTHREAD.
44#
45# Please let the authors know if this macro fails on any platform, or if
46# you have any other suggestions or comments. This macro was based on work
47# by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
48# from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
49# Alejandro Forero Cuervo to the autoconf macro repository. We are also
50# grateful for the helpful feedback of numerous users.
51#
52# Updated for Autoconf 2.68 by Daniel Richard G.
53#
54# LICENSE
55#
56# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
57# Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
b72f6acb 58# Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl>
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59#
60# This program is free software: you can redistribute it and/or modify it
61# under the terms of the GNU General Public License as published by the
62# Free Software Foundation, either version 3 of the License, or (at your
63# option) any later version.
64#
65# This program is distributed in the hope that it will be useful, but
66# WITHOUT ANY WARRANTY; without even the implied warranty of
67# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
68# Public License for more details.
69#
70# You should have received a copy of the GNU General Public License along
8ca861a5 71# with this program. If not, see <https://www.gnu.org/licenses/>.
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72#
73# As a special exception, the respective Autoconf Macro's copyright owner
74# gives unlimited permission to copy, distribute and modify the configure
75# scripts that are the output of Autoconf when processing the Macro. You
76# need not follow the terms of the GNU General Public License when using
77# or distributing such scripts, even though portions of the text of the
78# Macro appear in them. The GNU General Public License (GPL) does govern
79# all other use of the material that constitutes the Autoconf Macro.
80#
81# This special exception to the GPL applies to versions of the Autoconf
82# Macro released by the Autoconf Archive. When you make and distribute a
83# modified version of the Autoconf Macro, you may extend this special
84# exception to the GPL to apply to your modified version as well.
85
b72f6acb 86#serial 27
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87
88AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
89AC_DEFUN([AX_PTHREAD], [
90AC_REQUIRE([AC_CANONICAL_HOST])
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91AC_REQUIRE([AC_PROG_CC])
92AC_REQUIRE([AC_PROG_SED])
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93AC_LANG_PUSH([C])
94ax_pthread_ok=no
95
96# We used to check for pthread.h first, but this fails if pthread.h
7be759d1 97# requires special compiler flags (e.g. on Tru64 or Sequent).
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98# It gets checked for in the link test anyway.
99
100# First of all, check if the user has set any of the PTHREAD_LIBS,
101# etcetera environment variables, and if threads linking works using
102# them:
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103if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
104 ax_pthread_save_CC="$CC"
105 ax_pthread_save_CFLAGS="$CFLAGS"
106 ax_pthread_save_LIBS="$LIBS"
107 AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
074c3a1b 108 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
074c3a1b 109 LIBS="$PTHREAD_LIBS $LIBS"
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110 AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
111 AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
074c3a1b 112 AC_MSG_RESULT([$ax_pthread_ok])
7be759d1 113 if test "x$ax_pthread_ok" = "xno"; then
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114 PTHREAD_LIBS=""
115 PTHREAD_CFLAGS=""
116 fi
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117 CC="$ax_pthread_save_CC"
118 CFLAGS="$ax_pthread_save_CFLAGS"
119 LIBS="$ax_pthread_save_LIBS"
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120fi
121
122# We must check for the threads library under a number of different
123# names; the ordering is very important because some systems
124# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
125# libraries is broken (non-POSIX).
126
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127# Create a list of thread flags to try. Items with a "," contain both
128# C compiler flags (before ",") and linker flags (after ","). Other items
129# starting with a "-" are C compiler flags, and remaining items are
130# library names, except for "none" which indicates that we try without
131# any flags at all, and "pthread-config" which is a program returning
132# the flags for the Pth emulation library.
074c3a1b 133
7be759d1 134ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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135
136# The ordering *is* (sometimes) important. Some notes on the
137# individual items follow:
138
139# pthreads: AIX (must check this before -lpthread)
140# none: in case threads are in libc; should be tried before -Kthread and
141# other compiler flags to prevent continual compiler warnings
142# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
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143# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
144# (Note: HP C rejects this with "bad form for `-t' option")
145# -pthreads: Solaris/gcc (Note: HP C also rejects)
074c3a1b 146# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
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147# doesn't hurt to check since this sometimes defines pthreads and
148# -D_REENTRANT too), HP C (must be checked before -lpthread, which
149# is present but should not be used directly; and before -mthreads,
150# because the compiler interprets this as "-mt" + "-hreads")
151# -mthreads: Mingw32/gcc, Lynx/gcc
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152# pthread: Linux, etcetera
153# --thread-safe: KAI C++
154# pthread-config: use pthread-config program (for GNU Pth library)
155
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156case $host_os in
157
158 freebsd*)
159
160 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
161 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
162
163 ax_pthread_flags="-kthread lthread $ax_pthread_flags"
164 ;;
165
166 hpux*)
167
168 # From the cc(1) man page: "[-mt] Sets various -D flags to enable
169 # multi-threading and also sets -lpthread."
170
171 ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
172 ;;
173
174 openedition*)
175
176 # IBM z/OS requires a feature-test macro to be defined in order to
177 # enable POSIX threads at all, so give the user a hint if this is
178 # not set. (We don't define these ourselves, as they can affect
179 # other portions of the system API in unpredictable ways.)
180
181 AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
182 [
183# if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
184 AX_PTHREAD_ZOS_MISSING
185# endif
186 ],
187 [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
188 ;;
189
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190 solaris*)
191
192 # On Solaris (at least, for some versions), libc contains stubbed
193 # (non-functional) versions of the pthreads routines, so link-based
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194 # tests will erroneously succeed. (N.B.: The stubs are missing
195 # pthread_cleanup_push, or rather a function called by this macro,
196 # so we could check for that, but who knows whether they'll stub
197 # that too in a future libc.) So we'll check first for the
198 # standard Solaris way of linking pthreads (-mt -lpthread).
199
b72f6acb 200 ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags"
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201 ;;
202esac
203
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204# Are we compiling with Clang?
205
206AC_CACHE_CHECK([whether $CC is Clang],
207 [ax_cv_PTHREAD_CLANG],
208 [ax_cv_PTHREAD_CLANG=no
209 # Note that Autoconf sets GCC=yes for Clang as well as GCC
210 if test "x$GCC" = "xyes"; then
211 AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
212 [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
213# if defined(__clang__) && defined(__llvm__)
214 AX_PTHREAD_CC_IS_CLANG
215# endif
216 ],
217 [ax_cv_PTHREAD_CLANG=yes])
218 fi
219 ])
220ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
221
222
7be759d1 223# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
074c3a1b 224
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225# Note that for GCC and Clang -pthread generally implies -lpthread,
226# except when -nostdlib is passed.
227# This is problematic using libtool to build C++ shared libraries with pthread:
228# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
229# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
230# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
231# To solve this, first try -pthread together with -lpthread for GCC
232
7be759d1 233AS_IF([test "x$GCC" = "xyes"],
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234 [ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"])
235
236# Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first
237
238AS_IF([test "x$ax_pthread_clang" = "xyes"],
239 [ax_pthread_flags="-pthread,-lpthread -pthread"])
240
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241
242# The presence of a feature test macro requesting re-entrant function
243# definitions is, on some systems, a strong hint that pthreads support is
244# correctly enabled
245
246case $host_os in
247 darwin* | hpux* | linux* | osf* | solaris*)
248 ax_pthread_check_macro="_REENTRANT"
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249 ;;
250
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251 aix*)
252 ax_pthread_check_macro="_THREAD_SAFE"
253 ;;
254
255 *)
256 ax_pthread_check_macro="--"
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257 ;;
258esac
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259AS_IF([test "x$ax_pthread_check_macro" = "x--"],
260 [ax_pthread_check_cond=0],
261 [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
262
7be759d1 263
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264if test "x$ax_pthread_ok" = "xno"; then
265for ax_pthread_try_flag in $ax_pthread_flags; do
266
267 case $ax_pthread_try_flag in
268 none)
269 AC_MSG_CHECKING([whether pthreads work without any flags])
270 ;;
271
272 *,*)
273 PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"`
274 PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"`
275 AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"])
276 ;;
277
278 -*)
279 AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
280 PTHREAD_CFLAGS="$ax_pthread_try_flag"
281 ;;
282
283 pthread-config)
284 AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
285 AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
286 PTHREAD_CFLAGS="`pthread-config --cflags`"
287 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
288 ;;
289
290 *)
291 AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
292 PTHREAD_LIBS="-l$ax_pthread_try_flag"
293 ;;
294 esac
295
296 ax_pthread_save_CFLAGS="$CFLAGS"
297 ax_pthread_save_LIBS="$LIBS"
298 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
299 LIBS="$PTHREAD_LIBS $LIBS"
300
301 # Check for various functions. We must include pthread.h,
302 # since some functions may be macros. (On the Sequent, we
303 # need a special flag -Kthread to make this header compile.)
304 # We check for pthread_join because it is in -lpthread on IRIX
305 # while pthread_create is in libc. We check for pthread_attr_init
306 # due to DEC craziness with -lpthreads. We check for
307 # pthread_cleanup_push because it is one of the few pthread
308 # functions on Solaris that doesn't have a non-functional libc stub.
309 # We try pthread_create on general principles.
310
311 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
312# if $ax_pthread_check_cond
313# error "$ax_pthread_check_macro must be defined"
314# endif
315 static void *some_global = NULL;
316 static void routine(void *a)
317 {
318 /* To avoid any unused-parameter or
319 unused-but-set-parameter warning. */
320 some_global = a;
321 }
322 static void *start_routine(void *a) { return a; }],
323 [pthread_t th; pthread_attr_t attr;
324 pthread_create(&th, 0, start_routine, 0);
325 pthread_join(th, 0);
326 pthread_attr_init(&attr);
327 pthread_cleanup_push(routine, 0);
328 pthread_cleanup_pop(0) /* ; */])],
329 [ax_pthread_ok=yes],
330 [])
331
332 CFLAGS="$ax_pthread_save_CFLAGS"
333 LIBS="$ax_pthread_save_LIBS"
334
335 AC_MSG_RESULT([$ax_pthread_ok])
336 AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
337
338 PTHREAD_LIBS=""
339 PTHREAD_CFLAGS=""
340done
341fi
7be759d1 342
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343
344# Clang needs special handling, because older versions handle the -pthread
345# option in a rather... idiosyncratic way
346
347if test "x$ax_pthread_clang" = "xyes"; then
348
349 # Clang takes -pthread; it has never supported any other flag
350
351 # (Note 1: This will need to be revisited if a system that Clang
352 # supports has POSIX threads in a separate library. This tends not
353 # to be the way of modern systems, but it's conceivable.)
354
355 # (Note 2: On some systems, notably Darwin, -pthread is not needed
356 # to get POSIX threads support; the API is always present and
357 # active. We could reasonably leave PTHREAD_CFLAGS empty. But
358 # -pthread does define _REENTRANT, and while the Darwin headers
359 # ignore this macro, third-party headers might not.)
360
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361 # However, older versions of Clang make a point of warning the user
362 # that, in an invocation where only linking and no compilation is
363 # taking place, the -pthread option has no effect ("argument unused
364 # during compilation"). They expect -pthread to be passed in only
365 # when source code is being compiled.
366 #
367 # Problem is, this is at odds with the way Automake and most other
368 # C build frameworks function, which is that the same flags used in
369 # compilation (CFLAGS) are also used in linking. Many systems
370 # supported by AX_PTHREAD require exactly this for POSIX threads
371 # support, and in fact it is often not straightforward to specify a
372 # flag that is used only in the compilation phase and not in
373 # linking. Such a scenario is extremely rare in practice.
374 #
375 # Even though use of the -pthread flag in linking would only print
376 # a warning, this can be a nuisance for well-run software projects
377 # that build with -Werror. So if the active version of Clang has
378 # this misfeature, we search for an option to squash it.
379
380 AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
381 [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
382 [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
383 # Create an alternate version of $ac_link that compiles and
384 # links in two steps (.c -> .o, .o -> exe) instead of one
385 # (.c -> exe), because the warning occurs only in the second
386 # step
387 ax_pthread_save_ac_link="$ac_link"
388 ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
b72f6acb 389 ax_pthread_link_step=`AS_ECHO(["$ac_link"]) | sed "$ax_pthread_sed"`
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390 ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
391 ax_pthread_save_CFLAGS="$CFLAGS"
392 for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
393 AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
394 CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
395 ac_link="$ax_pthread_save_ac_link"
396 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
397 [ac_link="$ax_pthread_2step_ac_link"
398 AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
399 [break])
400 ])
401 done
402 ac_link="$ax_pthread_save_ac_link"
403 CFLAGS="$ax_pthread_save_CFLAGS"
404 AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
405 ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
406 ])
074c3a1b 407
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408 case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
409 no | unknown) ;;
410 *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
411 esac
074c3a1b 412
7be759d1 413fi # $ax_pthread_clang = yes
074c3a1b 414
074c3a1b 415
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416
417# Various other checks:
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418if test "x$ax_pthread_ok" = "xyes"; then
419 ax_pthread_save_CFLAGS="$CFLAGS"
420 ax_pthread_save_LIBS="$LIBS"
074c3a1b 421 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
7be759d1 422 LIBS="$PTHREAD_LIBS $LIBS"
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423
424 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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425 AC_CACHE_CHECK([for joinable pthread attribute],
426 [ax_cv_PTHREAD_JOINABLE_ATTR],
427 [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
428 for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
429 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
430 [int attr = $ax_pthread_attr; return attr /* ; */])],
431 [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
432 [])
433 done
434 ])
435 AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
436 test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
437 test "x$ax_pthread_joinable_attr_defined" != "xyes"],
438 [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
439 [$ax_cv_PTHREAD_JOINABLE_ATTR],
440 [Define to necessary symbol if this constant
441 uses a non-standard name on your system.])
442 ax_pthread_joinable_attr_defined=yes
443 ])
444
445 AC_CACHE_CHECK([whether more special flags are required for pthreads],
446 [ax_cv_PTHREAD_SPECIAL_FLAGS],
447 [ax_cv_PTHREAD_SPECIAL_FLAGS=no
448 case $host_os in
449 solaris*)
450 ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
451 ;;
452 esac
453 ])
454 AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
455 test "x$ax_pthread_special_flags_added" != "xyes"],
456 [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
457 ax_pthread_special_flags_added=yes])
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458
459 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
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460 [ax_cv_PTHREAD_PRIO_INHERIT],
461 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
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462 [[int i = PTHREAD_PRIO_INHERIT;
463 return i;]])],
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464 [ax_cv_PTHREAD_PRIO_INHERIT=yes],
465 [ax_cv_PTHREAD_PRIO_INHERIT=no])
074c3a1b 466 ])
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467 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
468 test "x$ax_pthread_prio_inherit_defined" != "xyes"],
469 [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
470 ax_pthread_prio_inherit_defined=yes
471 ])
074c3a1b 472
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473 CFLAGS="$ax_pthread_save_CFLAGS"
474 LIBS="$ax_pthread_save_LIBS"
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475
476 # More AIX lossage: compile with *_r variant
7be759d1 477 if test "x$GCC" != "xyes"; then
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478 case $host_os in
479 aix*)
480 AS_CASE(["x/$CC"],
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481 [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
482 [#handle absolute path differently from PATH based program lookup
483 AS_CASE(["x$CC"],
484 [x/*],
485 [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
486 [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
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487 ;;
488 esac
489 fi
490fi
491
492test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
493
494AC_SUBST([PTHREAD_LIBS])
495AC_SUBST([PTHREAD_CFLAGS])
496AC_SUBST([PTHREAD_CC])
497
498# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
7be759d1 499if test "x$ax_pthread_ok" = "xyes"; then
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500 ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
501 :
502else
503 ax_pthread_ok=no
504 $2
505fi
506AC_LANG_POP
507])dnl AX_PTHREAD
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