re PR c/48650 (valgrind: Invalid write of size 8 in build_string (tree.c:1524))

2011-04-18  Richard Guenther  <rguenther@suse.de>

	PR middle-end/48650
	* tree.c (build_string): STRING_CST is now derived from tree_typed.

From-SVN: r172642

gcc/ChangeLog

+2011-04-18  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/48650
+	* tree.c (build_string): STRING_CST is now derived from tree_typed.
+
 2011-04-18  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR lto/48492

gcc/tree.c

@@ -1521,7 +1521,7 @@ build_string (int len, const char *str)
 
   s = ggc_alloc_tree_node (length);
 
-  memset (s, 0, sizeof (struct tree_common));
+  memset (s, 0, sizeof (struct tree_typed));
   TREE_SET_CODE (s, STRING_CST);
   TREE_CONSTANT (s) = 1;
   TREE_STRING_LENGTH (s) = len;