re PR preprocessor/32868 (Don't warn about redefinitions of __STDC_FORMAT_MACROS)

libcpp
	PR preprocessor/32868:
	* macro.c (_cpp_create_definition): Special case
	__STDC_FORMAT_MACROS.
gcc/testsuite
	PR preprocessor/32868:
	* gcc.dg/cpp/pr32868.c: New file.

From-SVN: r130544

gcc/testsuite/ChangeLog

+2007-11-30  Tom Tromey  <tromey@redhat.com>
+
+	PR preprocessor/32868:
+	* gcc.dg/cpp/pr32868.c: New file.
+
 2007-11-30  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/34248

gcc/testsuite/gcc.dg/cpp/pr32868.c

+/* PR preprocessor/32868.  It is ok to redefine __STDC_FORMAT_MACROS.  */
+
+/* { dg-do preprocess } */
+
+#define __STDC_FORMAT_MACROS 1
+#define __STDC_FORMAT_MACROS 1

libcpp/ChangeLog

+2007-11-30  Tom Tromey  <tromey@redhat.com>
+
+	PR preprocessor/32868:
+	* macro.c (_cpp_create_definition): Special case
+	__STDC_FORMAT_MACROS.
+
 2007-11-16  Michael Matz  <matz@suse.de>
 
 	* files.c (search_path_head): Fix check for absolute paths.

libcpp/macro.c

@@ -1695,7 +1695,8 @@ _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node)
   /* Enter definition in hash table.  */
   node->type = NT_MACRO;
   node->value.macro = macro;
-  if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_")))
+  if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))
+      && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_FORMAT_MACROS"))
     node->flags |= NODE_WARN;
 
   return ok;