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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 <http://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
*
* The authors hereby relinquish any claim to any copyright that they may have
* in this work, whether granted under contract or by operation of law or
* international treaty, and hereby commit to the public, at large, that they
* shall not, at any time in the future, seek to enforce any copyright in this
* work against any person or entity, or prevent any person or entity from
* copying, publishing, distributing or creating derivative works of this
* work.
*/
#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)
# 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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