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            <textarea name='content' rows='20'># ===========================================================================
#        https://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 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 $LIBS
#
#   If you are only building threaded programs, you may wish to use these
#   variables in your default LIBS, CFLAGS, and CC:
#
#     LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
#     CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
#     CXXFLAGS=&quot;$CXXFLAGS $PTHREAD_CFLAGS&quot;
#     CC=&quot;$PTHREAD_CC&quot;
#     CXX=&quot;$PTHREAD_CXX&quot;
#
#   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 &lt;stevenj@alum.mit.edu&gt;
#   Copyright (c) 2011 Daniel Richard G. &lt;skunk@iSKUNK.ORG&gt;
#   Copyright (c) 2019 Marc Stevens &lt;marc.stevens@cwi.nl&gt;
#
#   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 &lt;https://www.gnu.org/licenses/&gt;.
#
#   As a special exception, the respective Autoconf Macro&#039;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 31

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 &quot;x$PTHREAD_CFLAGS$PTHREAD_LIBS&quot; != &quot;x&quot;; then
        ax_pthread_save_CC=&quot;$CC&quot;
        ax_pthread_save_CFLAGS=&quot;$CFLAGS&quot;
        ax_pthread_save_LIBS=&quot;$LIBS&quot;
        AS_IF([test &quot;x$PTHREAD_CC&quot; != &quot;x&quot;], [CC=&quot;$PTHREAD_CC&quot;])
        AS_IF([test &quot;x$PTHREAD_CXX&quot; != &quot;x&quot;], [CXX=&quot;$PTHREAD_CXX&quot;])
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
        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 &quot;x$ax_pthread_ok&quot; = &quot;xno&quot;; then
                PTHREAD_LIBS=&quot;&quot;
                PTHREAD_CFLAGS=&quot;&quot;
        fi
        CC=&quot;$ax_pthread_save_CC&quot;
        CFLAGS=&quot;$ax_pthread_save_CFLAGS&quot;
        LIBS=&quot;$ax_pthread_save_LIBS&quot;
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 with a &quot;,&quot; contain both
# C compiler flags (before &quot;,&quot;) and linker flags (after &quot;,&quot;). Other items
# starting with a &quot;-&quot; are C compiler flags, and remaining items are
# library names, except for &quot;none&quot; which indicates that we try without
# any flags at all, and &quot;pthread-config&quot; which is a program returning
# the flags for the Pth emulation library.

ax_pthread_flags=&quot;pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config&quot;

# 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 &quot;bad form for `-t&#039; option&quot;)
# -pthreads: Solaris/gcc (Note: HP C also rejects)
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
#      doesn&#039;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 &quot;-mt&quot; + &quot;-hreads&quot;)
# -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=&quot;-kthread lthread $ax_pthread_flags&quot;
        ;;

        hpux*)

        # From the cc(1) man page: &quot;[-mt] Sets various -D flags to enable
        # multi-threading and also sets -lpthread.&quot;

        ax_pthread_flags=&quot;-mt -pthread pthread $ax_pthread_flags&quot;
        ;;

        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&#039;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) &amp;&amp; !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&#039;ll stub
        # that too in a future libc.)  So we&#039;ll check first for the
        # standard Solaris way of linking pthreads (-mt -lpthread).

        ax_pthread_flags=&quot;-mt,-lpthread pthread $ax_pthread_flags&quot;
        ;;
esac

# Are we compiling with Clang?

AC_CACHE_CHECK([whether $CC is Clang],
    [ax_cv_PTHREAD_CLANG],
    [ax_cv_PTHREAD_CLANG=no
     # Note that Autoconf sets GCC=yes for Clang as well as GCC
     if test &quot;x$GCC&quot; = &quot;xyes&quot;; then
        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
#            if defined(__clang__) &amp;&amp; defined(__llvm__)
             AX_PTHREAD_CC_IS_CLANG
#            endif
            ],
            [ax_cv_PTHREAD_CLANG=yes])
     fi
    ])
ax_pthread_clang=&quot;$ax_cv_PTHREAD_CLANG&quot;


# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)

# Note that for GCC and Clang -pthread generally implies -lpthread,
# except when -nostdlib is passed.
# This is problematic using libtool to build C++ shared libraries with pthread:
# [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460
# [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333
# [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555
# To solve this, first try -pthread together with -lpthread for GCC

AS_IF([test &quot;x$GCC&quot; = &quot;xyes&quot;],
      [ax_pthread_flags=&quot;-pthread,-lpthread -pthread -pthreads $ax_pthread_flags&quot;])

# Clang takes -pthread (never supported any other flag), but we&#039;ll try with -lpthread first

AS_IF([test &quot;x$ax_pthread_clang&quot; = &quot;xyes&quot;],
      [ax_pthread_flags=&quot;-pthread,-lpthread -pthread&quot;])


# 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=&quot;_REENTRANT&quot;
        ;;

        aix*)
        ax_pthread_check_macro=&quot;_THREAD_SAFE&quot;
        ;;

        *)
        ax_pthread_check_macro=&quot;--&quot;
        ;;
esac
AS_IF([test &quot;x$ax_pthread_check_macro&quot; = &quot;x--&quot;],
      [ax_pthread_check_cond=0],
      [ax_pthread_check_cond=&quot;!defined($ax_pthread_check_macro)&quot;])


if test &quot;x$ax_pthread_ok&quot; = &quot;xno&quot;; 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])
                ;;

                *,*)
                PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed &quot;s/^\(.*\),\(.*\)$/\1/&quot;`
                PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed &quot;s/^\(.*\),\(.*\)$/\2/&quot;`
                AC_MSG_CHECKING([whether pthreads work with &quot;$PTHREAD_CFLAGS&quot; and &quot;$PTHREAD_LIBS&quot;])
                ;;

                -*)
                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
                PTHREAD_CFLAGS=&quot;$ax_pthread_try_flag&quot;
                ;;

                pthread-config)
                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
                AS_IF([test &quot;x$ax_pthread_config&quot; = &quot;xno&quot;], [continue])
                PTHREAD_CFLAGS=&quot;`pthread-config --cflags`&quot;
                PTHREAD_LIBS=&quot;`pthread-config --ldflags` `pthread-config --libs`&quot;
                ;;

                *)
                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
                PTHREAD_LIBS=&quot;-l$ax_pthread_try_flag&quot;
                ;;
        esac

        ax_pthread_save_CFLAGS=&quot;$CFLAGS&quot;
        ax_pthread_save_LIBS=&quot;$LIBS&quot;
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;

        # 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&#039;t have a non-functional libc stub.
        # We try pthread_create on general principles.

        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include &lt;pthread.h&gt;
#                       if $ax_pthread_check_cond
#                        error &quot;$ax_pthread_check_macro must be defined&quot;
#                       endif
                        static void *some_global = NULL;
                        static void routine(void *a)
                          {
                             /* To avoid any unused-parameter or
                                unused-but-set-parameter warning.  */
                             some_global = a;
                          }
                        static void *start_routine(void *a) { return a; }],
                       [pthread_t th; pthread_attr_t attr;
                        pthread_create(&amp;th, 0, start_routine, 0);
                        pthread_join(th, 0);
                        pthread_attr_init(&amp;attr);
                        pthread_cleanup_push(routine, 0);
                        pthread_cleanup_pop(0) /* ; */])],
            [ax_pthread_ok=yes],
            [])

        CFLAGS=&quot;$ax_pthread_save_CFLAGS&quot;
        LIBS=&quot;$ax_pthread_save_LIBS&quot;

        AC_MSG_RESULT([$ax_pthread_ok])
        AS_IF([test &quot;x$ax_pthread_ok&quot; = &quot;xyes&quot;], [break])

        PTHREAD_LIBS=&quot;&quot;
        PTHREAD_CFLAGS=&quot;&quot;
done
fi


# Clang needs special handling, because older versions handle the -pthread
# option in a rather... idiosyncratic way

if test &quot;x$ax_pthread_clang&quot; = &quot;xyes&quot;; 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&#039;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.)

        # 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 (&quot;argument unused
        # during compilation&quot;).  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 &quot;argument unused&quot; 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 $ac_link that compiles and
             # links in two steps (.c -&gt; .o, .o -&gt; exe) instead of one
             # (.c -&gt; exe), because the warning occurs only in the second
             # step
             ax_pthread_save_ac_link=&quot;$ac_link&quot;
             ax_pthread_sed=&#039;s/conftest\.\$ac_ext/conftest.$ac_objext/g&#039;
             ax_pthread_link_step=`AS_ECHO([&quot;$ac_link&quot;]) | sed &quot;$ax_pthread_sed&quot;`
             ax_pthread_2step_ac_link=&quot;($ac_compile) &amp;&amp; (echo ==== &gt;&amp;5) &amp;&amp; ($ax_pthread_link_step)&quot;
             ax_pthread_save_CFLAGS=&quot;$CFLAGS&quot;
             for ax_pthread_try in &#039;&#039; -Qunused-arguments -Wno-unused-command-line-argument unknown; do
                AS_IF([test &quot;x$ax_pthread_try&quot; = &quot;xunknown&quot;], [break])
                CFLAGS=&quot;-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS&quot;
                ac_link=&quot;$ax_pthread_save_ac_link&quot;
                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
                    [ac_link=&quot;$ax_pthread_2step_ac_link&quot;
                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
                         [break])
                    ])
             done
             ac_link=&quot;$ax_pthread_save_ac_link&quot;
             CFLAGS=&quot;$ax_pthread_save_CFLAGS&quot;
             AS_IF([test &quot;x$ax_pthread_try&quot; = &quot;x&quot;], [ax_pthread_try=no])
             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=&quot;$ax_pthread_try&quot;
            ])

        case &quot;$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG&quot; in
                no | unknown) ;;
                *) PTHREAD_CFLAGS=&quot;$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS&quot; ;;
        esac

fi # $ax_pthread_clang = yes



# Various other checks:
if test &quot;x$ax_pthread_ok&quot; = &quot;xyes&quot;; then
        ax_pthread_save_CFLAGS=&quot;$CFLAGS&quot;
        ax_pthread_save_LIBS=&quot;$LIBS&quot;
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;

        # 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 &lt;pthread.h&gt;],
                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
                                [])
             done
            ])
        AS_IF([test &quot;x$ax_cv_PTHREAD_JOINABLE_ATTR&quot; != &quot;xunknown&quot; &amp;&amp; \
               test &quot;x$ax_cv_PTHREAD_JOINABLE_ATTR&quot; != &quot;xPTHREAD_CREATE_JOINABLE&quot; &amp;&amp; \
               test &quot;x$ax_pthread_joinable_attr_defined&quot; != &quot;xyes&quot;],
              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
                                  [$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 $host_os in
             solaris*)
             ax_cv_PTHREAD_SPECIAL_FLAGS=&quot;-D_POSIX_PTHREAD_SEMANTICS&quot;
             ;;
             esac
            ])
        AS_IF([test &quot;x$ax_cv_PTHREAD_SPECIAL_FLAGS&quot; != &quot;xno&quot; &amp;&amp; \
               test &quot;x$ax_pthread_special_flags_added&quot; != &quot;xyes&quot;],
              [PTHREAD_CFLAGS=&quot;$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS&quot;
               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 &lt;pthread.h&gt;]],
                                             [[int i = PTHREAD_PRIO_INHERIT;
                                               return i;]])],
                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
            ])
        AS_IF([test &quot;x$ax_cv_PTHREAD_PRIO_INHERIT&quot; = &quot;xyes&quot; &amp;&amp; \
               test &quot;x$ax_pthread_prio_inherit_defined&quot; != &quot;xyes&quot;],
              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
               ax_pthread_prio_inherit_defined=yes
              ])

        CFLAGS=&quot;$ax_pthread_save_CFLAGS&quot;
        LIBS=&quot;$ax_pthread_save_LIBS&quot;

        # More AIX lossage: compile with *_r variant
        if test &quot;x$GCC&quot; != &quot;xyes&quot;; then
            case $host_os in
                aix*)
                AS_CASE([&quot;x/$CC&quot;],
                    [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([&quot;x$CC&quot;],
                         [x/*],
                         [
			   AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC=&quot;${CC}_r&quot;])
			   AS_IF([test &quot;x${CXX}&quot; != &quot;x&quot;], [AS_IF([AS_EXECUTABLE_P([${CXX}_r])],[PTHREAD_CXX=&quot;${CXX}_r&quot;])])
			 ],
                         [
			   AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])
			   AS_IF([test &quot;x${CXX}&quot; != &quot;x&quot;], [AC_CHECK_PROGS([PTHREAD_CXX],[${CXX}_r],[$CXX])])
			 ]
                     )
                    ])
                ;;
            esac
        fi
fi

test -n &quot;$PTHREAD_CC&quot; || PTHREAD_CC=&quot;$CC&quot;
test -n &quot;$PTHREAD_CXX&quot; || PTHREAD_CXX=&quot;$CXX&quot;

AC_SUBST([PTHREAD_LIBS])
AC_SUBST([PTHREAD_CFLAGS])
AC_SUBST([PTHREAD_CC])
AC_SUBST([PTHREAD_CXX])

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test &quot;x$ax_pthread_ok&quot; = &quot;xyes&quot;; 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
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