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