Merged revisions 241932 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r241932 | seanbright | 2010-01-21 10:25:46 -0500 (Thu, 21 Jan 2010) | 5 lines
  
  Fix configure check for PTHREAD_ONCE_INIT when manually adding -Wall to CFLAGS.
  
  (closes issue #16666)
  Reported by: romain_proformatique
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@241938 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -13491,10 +13491,11 @@ CFLAGS="${CFLAGS} -Werror -Wmissing-braces"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <pthread.h>
+     void empty(){}
 int
 main ()
 {
-pthread_once_t once = PTHREAD_ONCE_INIT;
+pthread_once_t once = PTHREAD_ONCE_INIT; pthread_once(&once, empty);
   ;
   return 0;
 }

configure.ac

@@ -533,8 +533,9 @@ saved_CFLAGS="${CFLAGS}"
 CFLAGS="${CFLAGS} -Werror -Wmissing-braces"
 AC_COMPILE_IFELSE(
   [AC_LANG_PROGRAM(
-    [#include <pthread.h>],
-	[pthread_once_t once = PTHREAD_ONCE_INIT;])
+    [#include <pthread.h>
+     void empty(){}],
+	[pthread_once_t once = PTHREAD_ONCE_INIT; pthread_once(&once, empty);])
   ],[
     AC_MSG_RESULT(no)
     ac_cv_pthread_once_needsbraces="no"