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/*
attrs.h - wrapper macros for the gcc __attribute__(()) directive
Copyright (C) 2007, 2008, 2012 Arthur de Jong
This 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 2.1 of the License, or (at your option) any later version.
This 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#ifndef COMPAT__ATTRS_H
#define COMPAT__ATTRS_H 1
/* macro for testing the version of GCC */
#define GCC_VERSION(major, minor) \
((__GNUC__ > (major)) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
/* These are macros to use some gcc-specific flags in case they're available
and otherwise define them to empty strings. This allows us to give
the compiler some extra information.
See http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html
for a list of attributes supported by gcc */
/* this is used to flag function parameters that are not used in the function
body. */
#if GCC_VERSION(3, 0)
#define UNUSED(x) x __attribute__((__unused__))
#else
#define UNUSED(x) x
#endif
/* this is used to add extra format checking to the function calls as if this
was a printf()-like function */
#if GCC_VERSION(3, 0)
#define LIKE_PRINTF(format_idx, arg_idx) \
__attribute__((__format__(__printf__, format_idx, arg_idx)))
#else
#define LIKE_PRINTF(format_idx, arg_idx) /* no attribute */
#endif
/* indicates that the function is "pure": its result is purely based on
the parameters and has no side effects or used static data */
#if GCC_VERSION(3, 0)
#define PURE __attribute__((__pure__))
#else
#define PURE /* no attribute */
#endif
/* the function returns a new data structure that has been freshly
allocated */
#if GCC_VERSION(3, 0)
#define LIKE_MALLOC __attribute__((__malloc__))
#else
#define LIKE_MALLOC /* no attribute */
#endif
/* the function's return value should be used by the caller */
#if GCC_VERSION(3, 4)
#define MUST_USE __attribute__((__warn_unused_result__))
#else
#define MUST_USE /* no attribute */
#endif
/* the function's return value should be used by the caller */
#if GCC_VERSION(2, 5)
#define NORETURN __attribute__((__noreturn__))
#else
#define NORETURN /* no attribute */
#endif
/* define __STRING if it's not yet defined */
#ifndef __STRING
#ifdef __STDC__
#define __STRING(x) #x
#else /* __STDC__ */
#define __STRING(x) "x"
#endif /* not __STDC__ */
#endif /* not __STRING */
#endif /* not COMPAT__ATTRS_H */
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