From patchwork Fri Oct  5 11:42:44 2012
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Subject: Fix PR54811
Date: Fri, 05 Oct 2012 01:42:44 -0000
From: Richard Guenther <rguenther@suse.de>
X-Patchwork-Id: 189458
Message-Id: <alpine.LNX.2.00.1210051341570.4063@zhemvz.fhfr.qr>
To: gcc-patches@gcc.gnu.org

This fixes PR54811 for me - still Ada LTO bootstrap fails for me
with cgraph verification ICEs.

LTO bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2012-10-05  Richard Guenther  <rguenther@suse.de>

	PR middle-end/54811
	* tree-ssa-live.c (clear_unused_block_pointer_1): Look at
	DECL_DEBUG_EXPR again.


Index: gcc/tree-ssa-live.c
===================================================================
--- gcc/tree-ssa-live.c	(revision 192114)
+++ gcc/tree-ssa-live.c	(working copy)
@@ -621,6 +621,11 @@ clear_unused_block_pointer_1 (tree *tp,
   if (EXPR_P (*tp) && TREE_BLOCK (*tp)
       && !TREE_USED (TREE_BLOCK (*tp)))
     TREE_SET_BLOCK (*tp, NULL);
+  if (TREE_CODE (*tp) == VAR_DECL && DECL_DEBUG_EXPR_IS_FROM (*tp))
+    {
+      tree debug_expr = DECL_DEBUG_EXPR (*tp);
+      walk_tree (&debug_expr, clear_unused_block_pointer_1, NULL, NULL);
+    }
   return NULL_TREE;
 }