re PR middle-end/38371 (Fold check error during bootstrap)

	PR middle-end/38371
	* fold-const.c (fold_checksum_tree): Allow modification of
	TYPE_NEXT_VARIANT.

From-SVN: r142430

gcc/ChangeLog

+2008-12-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/38371
+	* fold-const.c (fold_checksum_tree): Allow modification of
+	TYPE_NEXT_VARIANT.
+
 2008-12-03  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/38360

gcc/fold-const.c

@@ -13364,9 +13364,11 @@ recursive_label:
       expr = (tree) &buf;
     }
   else if (TREE_CODE_CLASS (code) == tcc_type
-	   && (TYPE_POINTER_TO (expr) || TYPE_REFERENCE_TO (expr)
+	   && (TYPE_POINTER_TO (expr)
+	       || TYPE_REFERENCE_TO (expr)
 	       || TYPE_CACHED_VALUES_P (expr)
-	       || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)))
+	       || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
+	       || TYPE_NEXT_VARIANT (expr)))
     {
       /* Allow these fields to be modified.  */
       tree tmp;
@@ -13375,6 +13377,7 @@ recursive_label:
       TYPE_CONTAINS_PLACEHOLDER_INTERNAL (tmp) = 0;
       TYPE_POINTER_TO (tmp) = NULL;
       TYPE_REFERENCE_TO (tmp) = NULL;
+      TYPE_NEXT_VARIANT (tmp) = NULL;
       if (TYPE_CACHED_VALUES_P (tmp))
 	{
 	  TYPE_CACHED_VALUES_P (tmp) = 0;