Build: Upgrade m4/acx_pthread.m4 to the latest version.

m4/ax_pthread.m4

@@ -33,6 +33,10 @@
 #   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
@@ -45,9 +49,12 @@
 #   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
@@ -75,13 +82,12 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 11
+#serial 18
 
 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
 AC_REQUIRE([AC_CANONICAL_HOST])
-AC_LANG_SAVE
+AC_LANG_PUSH([C])
-AC_LANG_C
 ax_pthread_ok=no
 
 # We used to check for pthread.h first, but this fails if pthread.h
@@ -139,8 +145,8 @@ ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt
 # --thread-safe: KAI C++
 # pthread-config: use pthread-config program (for GNU Pth library)
 
-case "${host_cpu}-${host_os}" in
+case ${host_os} in
-        *solaris*)
+        solaris*)
 
         # On Solaris (at least, for some versions), libc contains stubbed
         # (non-functional) versions of the pthreads routines, so link-based
@@ -153,7 +159,7 @@ case "${host_cpu}-${host_os}" in
         ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
         ;;
 
-	*-darwin*)
+        darwin*)
         ax_pthread_flags="-pthread $ax_pthread_flags"
         ;;
 esac
@@ -198,7 +204,7 @@ for flag in $ax_pthread_flags; do
         # 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_TRY_LINK([#include <pthread.h>
+        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;
@@ -206,8 +212,9 @@ for flag in $ax_pthread_flags; do
                         pthread_join(th, 0);
                         pthread_attr_init(&attr);
                         pthread_cleanup_push(routine, 0);
-                     pthread_cleanup_pop(0); ],
+                        pthread_cleanup_pop(0) /* ; */])],
-                    [ax_pthread_ok=yes])
+                [ax_pthread_ok=yes],
+                [])
 
         LIBS="$save_LIBS"
         CFLAGS="$save_CFLAGS"
@@ -233,8 +240,10 @@ if test "x$ax_pthread_ok" = xyes; then
         AC_MSG_CHECKING([for joinable pthread attribute])
         attr_name=unknown
         for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-	    AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
+            AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
-                        [attr_name=$attr; break])
+                           [int attr = $attr; return attr /* ; */])],
+                [attr_name=$attr; break],
+                [])
         done
         AC_MSG_RESULT($attr_name)
         if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
@@ -245,15 +254,32 @@ if test "x$ax_pthread_ok" = xyes; then
 
         AC_MSG_CHECKING([if more special flags are required for pthreads])
         flag=no
-        case "${host_cpu}-${host_os}" in
+        case ${host_os} in
-            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
+            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
-            *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
+            osf* | hpux*) flag="-D_REENTRANT";;
+            solaris*)
+            if test "$GCC" = "yes"; then
+                flag="-D_REENTRANT"
+            else
+                flag="-mt -D_REENTRANT"
+            fi
+            ;;
         esac
         AC_MSG_RESULT(${flag})
         if test "x$flag" != xno; then
             PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
         fi
 
+        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$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
+            AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.]))
+
         LIBS="$save_LIBS"
         CFLAGS="$save_CFLAGS"
 
@@ -279,5 +305,5 @@ else
         ax_pthread_ok=no
         $2
 fi
-AC_LANG_RESTORE
+AC_LANG_POP
 ])dnl AX_PTHREAD