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-rw-r--r--include/features.h12
-rw-r--r--include/stdc-predef.h36
2 files changed, 40 insertions, 8 deletions
diff --git a/include/features.h b/include/features.h
index 6038ecc78d..c347555ead 100644
--- a/include/features.h
+++ b/include/features.h
@@ -1,5 +1,4 @@
-/* Copyright (C) 1991-1993,1995-2007,2009,2010,2011
-   Free Software Foundation, Inc.
+/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -337,12 +336,9 @@
 # define __USE_FORTIFY_LEVEL 0
 #endif
 
-/* We do support the IEC 559 math functionality, real and complex.  */
-#define __STDC_IEC_559__		1
-#define __STDC_IEC_559_COMPLEX__	1
-
-/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1.  */
-#define __STDC_ISO_10646__		200009L
+/* Get definitions of __STDC_* predefined macros, if the compiler has
+   not preincluded this header automatically.  */
+#include <stdc-predef.h>
 
 /* This macro indicates that the installed library is the GNU C Library.
    For historic reasons the value now is 6 and this will stay from now
diff --git a/include/stdc-predef.h b/include/stdc-predef.h
new file mode 100644
index 0000000000..ef10c1672e
--- /dev/null
+++ b/include/stdc-predef.h
@@ -0,0 +1,36 @@
+/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef	_STDC_PREDEF_H
+#define	_STDC_PREDEF_H	1
+
+/* This header is separate from features.h so that the compiler can
+   include it implicitly at the start of every compilation.  It must
+   not itself include <features.h> or any other header that includes
+   <features.h> because the implicit include comes before any feature
+   test macros that may be defined in a source file before it first
+   explicitly includes a system header.  GCC knows the name of this
+   header in order to preinclude it.  */
+
+/* We do support the IEC 559 math functionality, real and complex.  */
+#define __STDC_IEC_559__		1
+#define __STDC_IEC_559_COMPLEX__	1
+
+/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1.  */
+#define __STDC_ISO_10646__		200009L
+
+#endif