59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sys/cdefs.h
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* Declares internal macros for the C programming language.
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*/
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#ifndef INCLUDE_SYS_CDEFS_H
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#define INCLUDE_SYS_CDEFS_H
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#include <features.h>
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/* Preprocessor trick to turn anything into a string. */
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#define __STRINGIFY(x) #x
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/* Issue warning when this is used, except in defines, where the warning is
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inserted whenever the macro is expanded. This can be used to deprecated
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macros - and it happens on preprocessor level - so it shouldn't change any
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semantics of any code that uses such a macro. The argument msg should be a
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string that contains the warning. */
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#define __PRAGMA_WARNING(msg) _Pragma(__STRINGIFY(GCC warning msg))
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/* Use the real restrict keyword if it is available. Not that this really
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matters as gcc uses __restrict and __restrict__ as aliases for restrict, but
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it will look nicer after preprocessing. */
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#if __HAS_RESTRICT
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#undef __restrict
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#define __restrict restrict
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#endif
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/* Provide the restrict keyword if requested and unavailable. */
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#if !__HAS_RESTRICT && __want_restrict
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#define restrict __restrict
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#undef __HAS_RESTRICT
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#define __HAS_RESTRICT 2
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#endif
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/* Macro to declare a weak alias. */
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#if defined(__is_sortix_libc)
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#define weak_alias(old, new) \
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extern __typeof(old) new __attribute__((weak, alias(#old)))
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#endif
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#define __pure2 __attribute__((__const__))
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#endif
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