c99_compat.h 5.19 KB
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/**************************************************************************
 *
 * Copyright 2007-2013 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

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#include "no_extern_c.h"

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#ifndef _C99_COMPAT_H_
#define _C99_COMPAT_H_


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/*
 * MSVC hacks.
 */
#if defined(_MSC_VER)
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#  if _MSC_VER < 1900
#    error "Microsoft Visual Studio 2015 or higher required"
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#  endif

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   /*
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    * Visual Studio will complain if we define the `inline` keyword, but
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    * actually it only supports the keyword on C++.
    *
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    * To avoid this the _ALLOW_KEYWORD_MACROS must be set.
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    */
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#  if !defined(_ALLOW_KEYWORD_MACROS)
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#    define _ALLOW_KEYWORD_MACROS
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#  endif

   /*
    * XXX: MSVC has a `__restrict` keyword, but it also has a
    * `__declspec(restrict)` modifier, so it is impossible to define a
    * `restrict` macro without interfering with the latter.  Furthermore the
    * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT
    * macro.  For now resolve this issue by redefining _CRTRESTRICT, but going
    * forward we should probably should stop using restrict, especially
    * considering that our code does not obbey strict aliasing rules any way.
    */
#  include <crtdefs.h>
#  undef _CRTRESTRICT
#  define _CRTRESTRICT
#endif


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/*
 * C99 inline keyword
 */
#ifndef inline
#  ifdef __cplusplus
     /* C++ supports inline keyword */
#  elif defined(__GNUC__)
#    define inline __inline__
#  elif defined(_MSC_VER)
#    define inline __inline
#  elif defined(__ICL)
#    define inline __inline
#  elif defined(__INTEL_COMPILER)
     /* Intel compiler supports inline keyword */
#  elif defined(__WATCOMC__) && (__WATCOMC__ >= 1100)
#    define inline __inline
#  elif (__STDC_VERSION__ >= 199901L)
     /* C99 supports inline keyword */
#  else
#    define inline
#  endif
#endif


/*
 * C99 restrict keyword
 *
 * See also:
 * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
 */
#ifndef restrict
#  if (__STDC_VERSION__ >= 199901L)
     /* C99 */
#  elif defined(__GNUC__)
#    define restrict __restrict__
#  elif defined(_MSC_VER)
#    define restrict __restrict
#  else
#    define restrict /* */
#  endif
#endif


/*
 * C99 __func__ macro
 */
#ifndef __func__
#  if (__STDC_VERSION__ >= 199901L)
     /* C99 */
#  elif defined(__GNUC__)
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#    define __func__ __FUNCTION__
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#  elif defined(_MSC_VER)
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#    define __func__ __FUNCTION__
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#  else
#    define __func__ "<unknown>"
#  endif
#endif


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/* Simple test case for debugging */
#if 0
static inline const char *
test_c99_compat_h(const void * restrict a,
                  const void * restrict b)
{
   return __func__;
}
#endif


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/* Fallback definitions, for build systems other than autoconfig which don't
 * auto-detect these things. */
#ifdef HAVE_NO_AUTOCONF

#  ifndef _WIN32
#    define HAVE_PTHREAD
#    define HAVE_POSIX_MEMALIGN
#  endif

#  ifdef __GNUC__
#    if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
#      error "GCC version 4.2 or higher required"
#    endif

     /* https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Other-Builtins.html */
#    define HAVE___BUILTIN_CLZ 1
#    define HAVE___BUILTIN_CLZLL 1
#    define HAVE___BUILTIN_CTZ 1
#    define HAVE___BUILTIN_EXPECT 1
#    define HAVE___BUILTIN_FFS 1
#    define HAVE___BUILTIN_FFSLL 1
#    define HAVE___BUILTIN_POPCOUNT 1
#    define HAVE___BUILTIN_POPCOUNTLL 1
     /* https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Function-Attributes.html */
#    define HAVE_FUNC_ATTRIBUTE_FLATTEN 1
#    define HAVE_FUNC_ATTRIBUTE_UNUSED 1
#    define HAVE_FUNC_ATTRIBUTE_FORMAT 1
#    define HAVE_FUNC_ATTRIBUTE_PACKED 1
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#    define HAVE_FUNC_ATTRIBUTE_ALIAS 1
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#    define HAVE_FUNC_ATTRIBUTE_NORETURN 1
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#    if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
       /* https://gcc.gnu.org/onlinedocs/gcc-4.3.6/gcc/Other-Builtins.html */
#      define HAVE___BUILTIN_BSWAP32 1
#      define HAVE___BUILTIN_BSWAP64 1
#    endif

#    if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
#      define HAVE___BUILTIN_UNREACHABLE 1
#    endif

#  endif /* __GNUC__ */

#endif /* !HAVE_AUTOCONF */


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#endif /* _C99_COMPAT_H_ */