64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2015.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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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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