re PR c++/48369 ([C++0x] ICE in potential_constant_expression_1, at cp/semantics.c:7746)

	PR c++/48369
	* semantics.c (potential_constant_expression_1): Handle
	UNORDERED_EXPR and ORDERED_EXPR.

From-SVN: r171747

gcc/cp/ChangeLog

 2011-03-30  Jason Merrill  <jason@redhat.com>
 
+	PR c++/48369
+	* semantics.c (potential_constant_expression_1): Handle
+	UNORDERED_EXPR and ORDERED_EXPR.
+
 	PR c++/48281
 	* semantics.c (finish_compound_literal): Do put static/constant
 	arrays in static variables.

gcc/cp/semantics.c

@@ -7744,6 +7744,8 @@ 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:

gcc/testsuite/ChangeLog

 2011-03-30  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/regress/isnan.C: New.
+
 	* g++.dg/cpp0x/initlist46.C: New.
 
 2011-03-30  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/testsuite/g++.dg/cpp0x/regress/isnan.C

+// PR c++/48369
+// { dg-options -std=gnu++0x }
+
+extern "C" int isnan (double);
+
+void f(double d)
+{
+    bool b = isnan(d);
+}