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Move __STDC_* predefined macros from features.h to stdc-predef.h.

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1 parent ef0aab3 commit ff3b3d82781300d48abec8a4a1600e7486663705 Joseph Myers committed Feb 22, 2012
Showing with 58 additions and 19 deletions.
  1. +6 −7 CONFORMANCE
  2. +8 −0 ChangeLog
  3. +1 −1 Makefile
  4. +3 −3 NEWS
  5. +4 −8 include/features.h
  6. +36 −0 include/stdc-predef.h
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@@ -134,13 +134,12 @@ Compiler limitations
====================
The macros __STDC_IEC_559__, __STDC_IEC_559_COMPLEX__ and
-__STDC_ISO_10646__ are properly supposed to be defined by the
-compiler, and to be constant throughout the translation unit (before
-and after any library headers are included). However, they mainly
-relate to library features, and the necessary magic has yet to be
-implemented for GCC to predefine them to the correct values for the
-library in use, so glibc defines them in <features.h>. Programs that
-test them before including any standard headers may misbehave.
+__STDC_ISO_10646__ are properly supposed to be constant throughout the
+translation unit (before and after any library headers are included).
+However, they mainly relate to library features, and GCC only knows to
+preinclude <stdc-predef.h> to get their definitions in version 4.8 and
+later. Programs that test them before including any standard headers
+may misbehave with older compilers.
GCC doesn't support the optional imaginary types. Nor does it
understand the keyword _Complex before GCC 3.0. This has the
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@@ -1,5 +1,13 @@
2012-02-22 Joseph Myers <joseph@codesourcery.com>
+ [BZ #10110]
+ * include/stdc-predef.h: New file. Extracted from features.h.
+ * include/features.h: Include stdc-predef.h.
+ * Makefile (headers): Add stdc-predef.h.
+ * CONFORMANCE (Compiler limitations): Update.
+
+2012-02-22 Joseph Myers <joseph@codesourcery.com>
+
* manual/libc.texinfo (VERSION, UPDATED): Revert.
2012-02-21 David S. Miller <davem@davemloft.net>
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@@ -60,7 +60,7 @@ endif # $(AUTOCONF) = no
$(addprefix install-, no-libc.a bin lib data headers others)
headers := limits.h values.h features.h gnu-versions.h bits/libc-lock.h \
- bits/xopen_lim.h gnu/libc-version.h
+ bits/xopen_lim.h gnu/libc-version.h stdc-predef.h
echo-headers: subdir_echo-headers
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@@ -10,9 +10,9 @@ Version 2.16
* The following bugs are resolved with this release:
174, 350, 411, 3335, 4026, 4596, 4822, 5077, 5805, 5993, 6884, 6907, 9739,
- 9902, 10140, 10210, 11174, 11322, 11494, 12047, 13058, 13525, 13526,
- 13527, 13528, 13529, 13530, 13531, 13532, 13533, 13547, 13551, 13552,
- 13553, 13555, 13559, 13583, 13618, 13695, 13704
+ 9902, 10110, 10140, 10210, 11174, 11322, 11494, 12047, 13058, 13525,
+ 13526, 13527, 13528, 13529, 13530, 13531, 13532, 13533, 13547, 13551,
+ 13552, 13553, 13555, 13559, 13583, 13618, 13695, 13704
* ISO C11 support:
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@@ -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
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@@ -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

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