re PR target/41810 (Cannot build gcc: gthr-default.h:466: error: '__mutex' was…

re PR target/41810 (Cannot build gcc: gthr-default.h:466: error: '__mutex' was not declared in this scope)

	PR target/41810
	* gthr-solaris.h (__gthread_mutex_destroy): Remove UNUSED.
	[SUPPORTS_WEAK && GTHREAD_USE_WEAK] (__gthread_active_p): Use
	__extension__ to allow cast from function pointer to object
	pointer in C++.
	* doc/install.texi (--enable-threads): Clarify use of Solaris
	threads.

From-SVN: r154708

gcc/ChangeLog

+2009-11-27  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR target/41810
+	* gthr-solaris.h (__gthread_mutex_destroy): Remove UNUSED.
+	[SUPPORTS_WEAK && GTHREAD_USE_WEAK] (__gthread_active_p): Use
+	__extension__ to allow cast from function pointer to object
+	pointer in C++.
+	* doc/install.texi (--enable-threads): Clarify use of Solaris
+	threads.
+
 2009-11-27  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* config/ia64/itanium1.md: Remove.

gcc/doc/install.texi

@@ -1118,7 +1118,8 @@ RTEMS thread support.
 @item single
 Disable thread support, should work for all platforms.
 @item solaris
-Sun Solaris 2 thread support.
+Sun Solaris 2/Unix International thread support.  Only use this if you
+really need to use this legacy API instead of the default, @samp{posix}.
 @item vxworks
 VxWorks thread support.
 @item win32

gcc/gthr-solaris.h

@@ -102,7 +102,8 @@ __gthrw(cond_signal)
 static inline int
 __gthread_active_p (void)
 {
-  static void *const __gthread_active_ptr = (void *) &__gthrw_(thr_create);
+  static void *const __gthread_active_ptr
+    = __extension__ (void *) &__gthrw_(thr_create);
   return __gthread_active_ptr != 0;
 }
 
@@ -460,7 +461,7 @@ __gthread_setspecific (__gthread_key_t __key, const void *__ptr)
 }
 
 static inline int
-__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(__mutex))
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
 {
   if (__gthread_active_p ())
     return __gthrw_(mutex_destroy) (__mutex);