re PR bootstrap/68346 (Bootstrap failure on i686-linux)

	PR bootstrap/68346
	* call.c (build_new_op_1): Don't fold arguments to
	warn_tautological_cmp.

From-SVN: r230382

gcc/cp/ChangeLog

+2015-11-14  Jason Merrill  <jason@redhat.com>
+
+	PR bootstrap/68346
+	* call.c (build_new_op_1): Don't fold arguments to
+	warn_tautological_cmp.
+
 2015-11-14  Jakub Jelinek  <jakub@redhat.com>
 
 	* semantics.c (finish_omp_clauses): Don't mark

gcc/cp/call.c

@@ -5741,7 +5741,7 @@ build_new_op_1 (location_t loc, enum tree_code code, int flags, tree arg1,
 	maybe_warn_bool_compare (loc, code, fold (arg1),
 				 fold (arg2));
       if (complain & tf_warning && warn_tautological_compare)
-	warn_tautological_cmp (loc, code, fold (arg1), fold (arg2));
+	warn_tautological_cmp (loc, code, arg1, arg2);
       /* Fall through.  */
     case PLUS_EXPR:
     case MINUS_EXPR:

gcc/testsuite/g++.dg/warn/Wtautological-compare.C

+// PR bootstrap/68346
+// { dg-options -Wtautological-compare }
+
+bool f(unsigned u)
+{
+  return ((unsigned)(int)u == u);
+}