[Ada] Small tweak to signal handling code

[Arnaud Charlet]

This changes the mapping of SIGBUS from Constraint_Error to Storage_Error in
non-tasking mode on Linux, to be consistent with the tasking mode.

Tested on x86_64-pc-linux-gnu, committed on trunk

2012-02-22  Eric Botcazou  <ebotcazou@adacore.com>

	* init.c (__gnat_error_handler) [Linux]: Map SIGBUS to
	Storage_Error.

-------------- next part --------------
Index: init.c
===================================================================
--- init.c	(revision 184470)
+++ init.c	(working copy)
@@ -6,7 +6,7 @@
  *                                                                          *
  *                          C Implementation File                           *
  *                                                                          *
- *          Copyright (C) 1992-2011, Free Software Foundation, Inc.         *
+ *          Copyright (C) 1992-2012, Free Software Foundation, Inc.         *
  *                                                                          *
  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  * terms of the  GNU General Public License as published  by the Free Soft- *
@@ -661,8 +661,8 @@
       break;
 
     case SIGBUS:
-      exception = &constraint_error;
-      msg = "SIGBUS";
+      exception = &storage_error;
+      msg = "SIGBUS: possible stack overflow";
       break;
 
     case SIGFPE: