re PR middle-end/48689 (ICE in fold-const.c:13798 with fold checking)

2011-05-22  Tom de Vries  <tom@codesourcery.com>

	PR middle-end/48689
	* fold-const.c (fold_checksum_tree): Guard TREE_CHAIN use with
	CODE_CONTAINS_STRUCT (TS_COMMON).

From-SVN: r174035

gcc/ChangeLog

+2011-05-22  Tom de Vries  <tom@codesourcery.com>
+
+	PR middle-end/48689
+	* fold-const.c (fold_checksum_tree): Guard TREE_CHAIN use with
+	CODE_CONTAINS_STRUCT (TS_COMMON).
+
 2011-05-22  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/49029

gcc/fold-const.c

@@ -13822,7 +13822,8 @@ recursive_label:
   if (TREE_CODE_CLASS (code) != tcc_type
       && TREE_CODE_CLASS (code) != tcc_declaration
       && code != TREE_LIST
-      && code != SSA_NAME)
+      && code != SSA_NAME
+      && CODE_CONTAINS_STRUCT (code, TS_COMMON))
     fold_checksum_tree (TREE_CHAIN (expr), ctx, ht);
   switch (TREE_CODE_CLASS (code))
     {