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/*
* Portability macros used in include files.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Copyright 2015 Russ Allbery <eagle@eyrie.org>
* Copyright 2008, 2011-2012
* The Board of Trustees of the Leland Stanford Junior University
*
* Copying and distribution of this file, with or without modification, are
* permitted in any medium without royalty provided the copyright notice and
* this notice are preserved. This file is offered as-is, without any
* warranty.
*
* SPDX-License-Identifier: FSFAP
*/
#ifndef PORTABLE_MACROS_H
#define PORTABLE_MACROS_H 1
/*
* __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7
* could you use the __format__ form of the attributes, which is what we use
* (to avoid confusion with other macros).
*/
#ifndef __attribute__
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
# define __attribute__(spec) /* empty */
# endif
#endif
/*
* We use __alloc_size__, but it was only available in fairly recent versions
* of GCC. Suppress warnings about the unknown attribute if GCC is too old.
* We know that we're GCC at this point, so we can use the GCC variadic macro
* extension, which will still work with versions of GCC too old to have C99
* variadic macro support.
*/
#if !defined(__attribute__) && !defined(__alloc_size__)
# if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)) \
&& !defined(__clang__)
# define __alloc_size__(spec, args...) /* empty */
# endif
#endif
/*
* LLVM and Clang pretend to be GCC but don't support all of the __attribute__
* settings that GCC does. For them, suppress warnings about unknown
* attributes on declarations. This unfortunately will affect the entire
* compilation context, but there's no push and pop available.
*/
#if !defined(__attribute__) && (defined(__llvm__) || defined(__clang__))
# pragma GCC diagnostic ignored "-Wattributes"
#endif
/*
* BEGIN_DECLS is used at the beginning of declarations so that C++
* compilers don't mangle their names. END_DECLS is used at the end.
*/
#undef BEGIN_DECLS
#undef END_DECLS
#ifdef __cplusplus
# define BEGIN_DECLS extern "C" {
# define END_DECLS }
#else
# define BEGIN_DECLS /* empty */
# define END_DECLS /* empty */
#endif
#endif /* !PORTABLE_MACROS_H */
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