* updating acx_pthread.m4 to newer version from http://autoconf-archive.cryp.to/

[catta] / common / acx_pthread.m4

diff --git a/common/acx_pthread.m4 b/common/acx_pthread.m4
index eeda301e3b3e240cd95c8fcaca79e97cc0f5d82c..06af84275815deaec9a838e8842ee4b5d898e905 100644 (file)
--- a/common/acx_pthread.m4
+++ b/common/acx_pthread.m4
@@ -1,5 +1,7 @@
 dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
 dnl
+dnl @summary figure out how to build C programs using POSIX threads
+dnl
 dnl This macro figures out how to build C programs using POSIX threads.
 dnl It sets the PTHREAD_LIBS output variable to the threads library and
 dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
@@ -41,7 +43,7 @@ dnl We are also grateful for the helpful feedback of numerous users.
 dnl
 dnl @category InstalledPackages
 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
-dnl @version 2005-01-14
+dnl @version 2005-06-15
 dnl @license GPLWithACException
 
 AC_DEFUN([ACX_PTHREAD], [
@@ -83,7 +85,7 @@ fi
 # 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.
 
-acx_pthread_flags="pthreads pthread none -Kthread -kthread lthread -pthread -pthreads -mthreads --thread-safe -mt pthread-config"
+acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
 
 # The ordering *is* (sometimes) important.  Some notes on the
 # individual items follow:
@@ -100,6 +102,7 @@ acx_pthread_flags="pthreads pthread none -Kthread -kthread lthread -pthread -pth
 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
 #      doesn't hurt to check since this sometimes defines pthreads too;
 #      also defines -D_REENTRANT)
+#      ... -mt is also the pthreads flag for HP/aCC
 # pthread: Linux, etcetera
 # --thread-safe: KAI C++
 # pthread-config: use pthread-config program (for GNU Pth library)
@@ -109,13 +112,13 @@ case "${host_cpu}-${host_os}" in
 
         # On Solaris (at least, for some versions), libc contains stubbed
         # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed.  (We need to link with -pthread or
+        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
         # -lpthread.)  (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 just look for -pthreads and -lpthread first:
 
-        acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
+        acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
         ;;
 esac
 
@@ -189,7 +192,7 @@ if test "x$acx_pthread_ok" = xyes; then
        AC_MSG_CHECKING([for joinable pthread attribute])
        attr_name=unknown
        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-           AC_TRY_LINK([#include <pthread.h>], [int attr=$attr;],
+           AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
                         [attr_name=$attr; break])
        done
         AC_MSG_RESULT($attr_name)