Upstream-Status: Inappropriate [Backport]
From 61759009408d9f43af89eaeaff769a656416e1af Mon Sep 17 00:00:00 2001
From: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 30 Mar 2011 19:50:17 +0000
Subject: [PATCH 045/200] 	PR c++/48369
 	* semantics.c (potential_constant_expression_1): Handle
 	UNORDERED_EXPR and ORDERED_EXPR.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@171746 138bc75d-0d04-0410-961f-82ee72b054a4

index b88e190..48dd4ee 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -7741,6 +7741,8 @@ potential_constant_expression_1 (tree t, bool want_rval, tsubst_flags_t flags)
     case BIT_XOR_EXPR:
     case BIT_AND_EXPR:
     case TRUTH_XOR_EXPR:
+    case UNORDERED_EXPR:
+    case ORDERED_EXPR:
     case UNLT_EXPR:
     case UNLE_EXPR:
     case UNGT_EXPR:
new file mode 100644
index 0000000..40d07e5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/regress/isnan.C
@@ -0,0 +1,9 @@
+// PR c++/48369
+// { dg-options -std=gnu++0x }
+
+extern "C" int isnan (double);
+
+void f(double d)
+{
+    bool b = isnan(d);
+}
-- 
1.7.0.4