From b6d41cbd12e116b9e37e1f8afb37927e4944bc95 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20=27Flameeyes=27=20Petten=C3=B2?=
 <flameeyes@gmail.com>
Date: Wed, 11 Apr 2007 17:32:13 +0200
Subject: Try linking the program for Pthread support, and feed proper
 parameters to pthread_create.

The link is needed to make sure that the LIBS variable is set correctly, otherwise it might just be finding the definition but using the wrong link-time parameter.

Also, feed proper parameters to pthread_create to avoid -Wnonnull to cause a test failure (GCC/GLIBC).
---
 m4/pthreads.m4 | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

(limited to 'm4')

diff --git a/m4/pthreads.m4 b/m4/pthreads.m4
index 28d72dd4f..35193370d 100644
--- a/m4/pthreads.m4
+++ b/m4/pthreads.m4
@@ -36,11 +36,15 @@ AC_DEFUN([CC_PTHREAD_FLAGS], [
     [ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $cc_cv_werror $PTHREAD_CFLAGS"
+     
      LIBS="$LIBS $PTHREAD_LIBS"
-     AC_COMPILE_IFELSE(
+     AC_LINK_IFELSE(
        [AC_LANG_PROGRAM(
-          [[#include <pthread.h>]],
-          [[pthread_create(NULL, NULL, NULL, NULL);]]
+          [[#include <pthread.h>
+	    void *fakethread(void *arg) { }
+	    pthread_t fakevariable;
+	  ]],
+          [[pthread_create(&fakevariable, NULL, &fakethread, NULL);]]
         )],
        [cc_cv_pthreads=yes],
        [cc_cv_pthreads=no])
-- 
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