http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54811
--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-10-05 10:11:25 UTC --- Testing 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; }