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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/52569] [4.8 Regression] bootstrap fails on x86_64-apple-darwin10 at revision 185261
Date: Tue, 13 Mar 2012 08:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52569

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-13 08:56:22 UTC ---
Index: libgcc/unwind-dw2-fde.c
===================================================================
--- libgcc/unwind-dw2-fde.c    (revision 185278)
+++ libgcc/unwind-dw2-fde.c    (working copy)
@@ -48,7 +48,9 @@ static struct object *seen_objects;
 #ifdef __GTHREAD_MUTEX_INIT
 static __gthread_mutex_t object_mutex = __GTHREAD_MUTEX_INIT;
 #define init_object_mutex_once()
-#else
+#endif
+
+#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
 static __gthread_mutex_t object_mutex;

 static void
@@ -63,6 +65,11 @@ init_object_mutex_once (void)
   static __gthread_once_t once = __GTHREAD_ONCE_INIT;
   __gthread_once (&once, init_object_mutex);
 }
+#else
+/* ???  Several targets include this file with stubbing parts of gthr.h
+   and expect no locking to be done.  */
+#define init_object_mutex_once()
+static __gthread_mutex_t object_mutex;
 #endif

 /* Called from crtbegin.o to register the unwind info for an object.  */