--- /dev/null
+// { dg-do compile }
+
+// Copyright (C) 2007, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <cwchar>
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+
+namespace gnu
+{
+#ifndef NULL
+ #error "NULL_must_be_a_macro"
+#endif
+
+#ifndef WCHAR_MAX
+ #error "WCHAR_MAX_must_be_a_macro"
+#endif
+
+#ifndef WCHAR_MIN
+ #error "WCHAR_MIN_must_be_a_macro"
+#endif
+
+#ifndef WEOF
+ #error "WEOF_must_be_a_macro"
+#endif
+}
+
+#endif