+2001-10-02 Neil Booth <neil@daikokuya.demon.co.uk>
+
+ * gcc.dg/cpp/macro11.c: New test.
+
2001-10-02 Joseph S. Myers <jsm28@cam.ac.uk>
* g++.dg/warn/format2.C, gcc.dg/format/attr-7.c,
--- /dev/null
+/* Copyright (C) 2001 Free Software Foundation, Inc. */
+
+/* { dg-do preprocess } */
+
+/* Source: Neil Booth, 2 Oct 2001.
+
+ Tests that we clear the disabled flag that is set by the
+ macro-defined-to-itself optimization (the optimization might not be
+ worth it). */
+
+#define foo foo
+#undef foo
+#define foo 1
+#if !foo
+#error foo still disabled!
+#endif