darwin.h (STACK_BOUNDARY): Define.

	* config/i386/darwin.h (STACK_BOUNDARY): Define.

Co-Authored-By: Hui-May Chang <hm.chang@apple.com>

From-SVN: r125555

gcc/ChangeLog

+2007-06-07  Geoffrey Keating  <geoffk@apple.com>
+
+	* config/i386/darwin.h (STACK_BOUNDARY): Define.
+
 2007-06-07  Simon Martin  <simartin@users.sourceforge.net>
 
 	PR c++/30759
@@ -12,7 +16,7 @@
 	(set_std_cxx98): Set cxx_dialect to cxx98.
 	(set_std_cxx0x): Set cxx_dialect to cxx0x.
 
-2007-06-06  Geoffrey Keating  <geoffk@apple.com>
+2007-06-07  Geoffrey Keating  <geoffk@apple.com>
 	    Hui-May Chang <hm.chang@apple.com>
 
 	* doc/invoke.texi (Darwin Options): Update documentation for

gcc/config/i386/darwin.h

@@ -69,6 +69,12 @@ Boston, MA 02110-1301, USA.  */
 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
 
+/* On Darwin, the stack is 128-bit aligned at the point of every call.
+   Failure to ensure this will lead to a crash in the system libraries
+   or dynamic loader.  */
+#undef STACK_BOUNDARY
+#define STACK_BOUNDARY 128
+
 /* We want -fPIC by default, unless we're using -static to compile for
    the kernel or some such.  */