include/c99_compat.h

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  27
  28 #ifndef _C99_COMPAT_H_
  29 #define _C99_COMPAT_H_
  30
  31
  32 /*
  33  * MSVC hacks.
  34  */
  35 #if defined(_MSC_VER)
  36    /*
  37     * Visual Studio 2012 will complain if we define the `inline` keyword, but
  38     * actually it only supports the keyword on C++.
  39     *
  40     * To avoid this the _ALLOW_KEYWORD_MACROS must be set.
  41     */
  42 #  if (_MSC_VER >= 1700) && !defined(_ALLOW_KEYWORD_MACROS)
  43 #    define _ALLOW_KEYWORD_MACROS
  44 #  endif
  45
  46    /*
  47     * XXX: MSVC has a `__restrict` keyword, but it also has a
  48     * `__declspec(restrict)` modifier, so it is impossible to define a
  49     * `restrict` macro without interfering with the latter.  Furthermore the
  50     * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT
  51     * macro.  For now resolve this issue by redefining _CRTRESTRICT, but going
  52     * forward we should probably should stop using restrict, especially
  53     * considering that our code does not obbey strict aliasing rules any way.
  54     */
  55 #  include <crtdefs.h>
  56 #  undef _CRTRESTRICT
  57 #  define _CRTRESTRICT
  58 #endif
  59
  60
  61 /*
  62  * C99 inline keyword
  63  */
  64 #ifndef inline
  65 #  ifdef __cplusplus
  66      /* C++ supports inline keyword */
  67 #  elif defined(__GNUC__)
  68 #    define inline __inline__
  69 #  elif defined(_MSC_VER)
  70 #    define inline __inline
  71 #  elif defined(__ICL)
  72 #    define inline __inline
  73 #  elif defined(__INTEL_COMPILER)
  74      /* Intel compiler supports inline keyword */
  75 #  elif defined(__WATCOMC__) && (__WATCOMC__ >= 1100)
  76 #    define inline __inline
  77 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
  78      /* C99 supports inline keyword */
  79 #  elif (__STDC_VERSION__ >= 199901L)
  80      /* C99 supports inline keyword */
  81 #  else
  82 #    define inline
  83 #  endif
  84 #endif
  85
  86
  87 /*
  88  * C99 restrict keyword
  89  *
  90  * See also:
  91  * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
  92  */
  93 #ifndef restrict
  94 #  if (__STDC_VERSION__ >= 199901L)
  95      /* C99 */
  96 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
  97      /* C99 */
  98 #  elif defined(__GNUC__)
  99 #    define restrict __restrict__
 100 #  elif defined(_MSC_VER)
 101 #    define restrict __restrict
 102 #  else
 103 #    define restrict /* */
 104 #  endif
 105 #endif
 106
 107
 108 /*
 109  * C99 __func__ macro
 110  */
 111 #ifndef __func__
 112 #  if (__STDC_VERSION__ >= 199901L)
 113      /* C99 */
 114 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
 115      /* C99 */
 116 #  elif defined(__GNUC__)
 117 #    if __GNUC__ >= 2
 118 #      define __func__ __FUNCTION__
 119 #    else
 120 #      define __func__ "<unknown>"
 121 #    endif
 122 #  elif defined(_MSC_VER)
 123 #    if _MSC_VER >= 1300
 124 #      define __func__ __FUNCTION__
 125 #    else
 126 #      define __func__ "<unknown>"
 127 #    endif
 128 #  else
 129 #    define __func__ "<unknown>"
 130 #  endif
 131 #endif
 132
 133
 134 /* Simple test case for debugging */
 135 #if 0
 136 static inline const char *
 137 test_c99_compat_h(const void * restrict a,
 138                   const void * restrict b)
 139 {
 140    return __func__;
 141 }
 142 #endif
 143
 144
 145 #endif /* _C99_COMPAT_H_ */