re PR middle-end/49945 (gcc.dg/guality/vla-1.c FAILs with -flto)

2011-12-08  Richard Guenther  <rguenther@suse.de>

	PR lto/49945
	* lto-streamer-out.c (tree_is_indexable): Localize variably
	modified types and their FIELD_DECLs.

From-SVN: r182107

gcc/ChangeLog

+2011-12-08  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/49945
+	* lto-streamer-out.c (tree_is_indexable): Localize variably
+	modified types and their FIELD_DECLs.
+
 2011-12-08  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR tree-optimization/51315

gcc/lto-streamer-out.c

@@ -139,6 +139,16 @@ tree_is_indexable (tree t)
 	   && DECL_CONTEXT (t)
 	   && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
     return false;
+  /* Variably modified types need to be streamed alongside function
+     bodies because they can refer to local entities.  Together with
+     them we have to localize their members as well.
+     ???  In theory that includes non-FIELD_DECLs as well.  */
+  else if (TYPE_P (t)
+	   && variably_modified_type_p (t, NULL_TREE))
+    return false;
+  else if (TREE_CODE (t) == FIELD_DECL
+	   && variably_modified_type_p (DECL_CONTEXT (t), NULL_TREE))
+    return false;
   else
     return (TYPE_P (t) || DECL_P (t) || TREE_CODE (t) == SSA_NAME);
 }