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sortix--sortix/libc/include/sys/cdefs.h
2013-12-17 14:30:44 +01:00

66 lines
2.3 KiB
C

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
sys/cdefs.h
Declares internal macros for the C programming language.
*******************************************************************************/
#ifndef INCLUDE_SYS_CDEFS_H
#define INCLUDE_SYS_CDEFS_H
#include <features.h>
/* Preprocessor trick to turn anything into a string. */
#define __STRINGIFY(x) #x
/* Issue warning when this is used, except in defines, where the warning is
inserted whenever the macro is expanded. This can be used to deprecated
macros - and it happens on preprocessor level - so it shouldn't change any
semantics of any code that uses such a macro. The argument msg should be a
string that contains the warning. */
#define __PRAGMA_WARNING(msg) _Pragma(__STRINGIFY(GCC warning msg))
/* C++ needs to know that types and declarations are C, not C++. */
#ifdef __cplusplus
#define __BEGIN_DECLS extern "C" {
#define __END_DECLS }
#else
#define __BEGIN_DECLS
#define __END_DECLS
#endif
/* Use the real restrict keyword if it is available. Not that this really
matters as gcc uses __restrict and __restrict__ as aliases for restrict, but
it will look nicer after preprocessing. */
#if __HAS_RESTRICT
#undef __restrict
#define __restrict restrict
#endif
/* Provide the restrict keyword if requested and unavailable. */
#if !__HAS_RESTRICT && __want_restrict
#define restrict __restrict
#undef __HAS_RESTRICT
#define __HAS_RESTRICT 2
#endif
#define __pure2 __attribute__((__const__))
#endif