re PR target/46093 (code compiled with -fsplit-stack crashes when passing large struct)

	PR target/46093
	* generic-morestack.c (__generic_morestack): Make sure the segment
	is large enough for both the stack frame and the copied
	parameters.

From-SVN: r179702

libgcc/ChangeLog

+2011-10-07  Ian Lance Taylor  <iant@google.com>
+
+	PR target/46093
+	* generic-morestack.c (__generic_morestack): Make sure the segment
+	is large enough for both the stack frame and the copied
+	parameters.
+
 2011-10-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR bootstrap/49804

libgcc/generic-morestack.c

@@ -512,7 +512,7 @@ __generic_morestack (size_t *pframe_size, void *old_stack, size_t param_size)
   current = *pp;
 
   if (current == NULL)
-    current = allocate_segment (frame_size);
+    current = allocate_segment (frame_size + param_size);
 
   current->old_stack = old_stack;