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sortix--sortix/libc/include/features.h
2013-12-17 14:30:33 +01:00

120 lines
3.8 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/>.
features.h
Various things for various systems, programs, compabillity, and whatnot.
*******************************************************************************/
#ifndef _FEATURES_H
#define _FEATURES_H 1
/* Support macro to ease testing the compiler version. */
#define __GCC_PREREQ(gcc_major, gcc_minor) \
(((gcc_major) == __GNUC__ && (gcc_minor) >= __GNUC_MINOR__) || \
((gcc_major) < __GNUC__))
/* 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
/* Sortix system components implicitly use the native API. */
#if defined(LIBC_LIBRARY) || defined(SORTIX_KERNEL)
#define _SORTIX_SOURCE 1
#endif
/* By default, assume the source is compiled using the native API. */
#if !defined(_SORTIX_SOURCE) && \
!defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) && \
!defined(_BSD_SOURCE) && \
!defined(_SVID_SOURCE) && \
!defined(_XOPEN_SOURCE) && !defined(_XOPEN_SOURCE_EXTENDED) && \
!defined(_GNU_SOURCE) && \
1
#define _SORTIX_SOURCE 1
#endif
/* Whether to override some "standard" functions with Sortix alternatives. */
#if !defined(__SORTIX_STDLIB_REDIRECTS)
#if defined(_SORTIX_SOURCE)
#define __SORTIX_STDLIB_REDIRECTS 1
#else
#define __SORTIX_STDLIB_REDIRECTS 0
#endif
#endif
/* Detect whether the restrict keyword is available. */
#if __STDC_VERSION__ >= 199901L
#define __HAS_RESTRICT 1
#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 when building the C library. */
#if !__HAS_RESTRICT && defined(LIBC_LIBRARY)
#define restrict __restrict
#undef __HAS_RESTRICT
#define __HAS_RESTRICT 2
#endif
/* TODO: Improve these declarations, perhaps like they are in glibc. */
/*#define __POSIX_NO_OBSOLETE*/
#ifdef __POSIX_NO_OBSOLETE
#define __POSIX_OBSOLETE 999999L
#else
#define __POSIX_OBSOLETE 200112L
#endif
#define __pure2 __attribute__((__const__))
/* Don't provide things from standard headers that is not implemented. */
/*#define __SORTIX_SHOW_UNIMPLEMENTED*/
#if !defined(_LIBC_HACK_FEATURE_NO_DECLARATIONS)
#include <sortix/bits.h>
#include <sys/__/types.h>
#endif
#undef _LIBC_HACK_FEATURE_NO_DECLARATIONS
#endif