include/c99_compat.h

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  27
  28 #include "no_extern_c.h"
  29
  30 #ifndef _C99_COMPAT_H_
  31 #define _C99_COMPAT_H_
  32
  33
  34 /*
  35  * MSVC hacks.
  36  */
  37 #if defined(_MSC_VER)
  38
  39 #  if _MSC_VER < 1500
  40 #    error "Microsoft Visual Studio 2008 or higher required"
  41 #  endif
  42
  43    /*
  44     * Visual Studio 2012 will complain if we define the `inline` keyword, but
  45     * actually it only supports the keyword on C++.
  46     *
  47     * To avoid this the _ALLOW_KEYWORD_MACROS must be set.
  48     */
  49 #  if (_MSC_VER >= 1700) && !defined(_ALLOW_KEYWORD_MACROS)
  50 #    define _ALLOW_KEYWORD_MACROS
  51 #  endif
  52
  53    /*
  54     * XXX: MSVC has a `__restrict` keyword, but it also has a
  55     * `__declspec(restrict)` modifier, so it is impossible to define a
  56     * `restrict` macro without interfering with the latter.  Furthermore the
  57     * MSVC standard library uses __declspec(restrict) under the _CRTRESTRICT
  58     * macro.  For now resolve this issue by redefining _CRTRESTRICT, but going
  59     * forward we should probably should stop using restrict, especially
  60     * considering that our code does not obbey strict aliasing rules any way.
  61     */
  62 #  include <crtdefs.h>
  63 #  undef _CRTRESTRICT
  64 #  define _CRTRESTRICT
  65 #endif
  66
  67
  68 /*
  69  * C99 inline keyword
  70  */
  71 #ifndef inline
  72 #  ifdef __cplusplus
  73      /* C++ supports inline keyword */
  74 #  elif defined(__GNUC__)
  75 #    define inline __inline__
  76 #  elif defined(_MSC_VER)
  77 #    define inline __inline
  78 #  elif defined(__ICL)
  79 #    define inline __inline
  80 #  elif defined(__INTEL_COMPILER)
  81      /* Intel compiler supports inline keyword */
  82 #  elif defined(__WATCOMC__) && (__WATCOMC__ >= 1100)
  83 #    define inline __inline
  84 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
  85      /* C99 supports inline keyword */
  86 #  elif (__STDC_VERSION__ >= 199901L)
  87      /* C99 supports inline keyword */
  88 #  else
  89 #    define inline
  90 #  endif
  91 #endif
  92
  93
  94 /*
  95  * C99 restrict keyword
  96  *
  97  * See also:
  98  * - http://cellperformance.beyond3d.com/articles/2006/05/demystifying-the-restrict-keyword.html
  99  */
 100 #ifndef restrict
 101 #  if (__STDC_VERSION__ >= 199901L)
 102      /* C99 */
 103 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
 104      /* C99 */
 105 #  elif defined(__GNUC__)
 106 #    define restrict __restrict__
 107 #  elif defined(_MSC_VER)
 108 #    define restrict __restrict
 109 #  else
 110 #    define restrict /* */
 111 #  endif
 112 #endif
 113
 114
 115 /*
 116  * C99 __func__ macro
 117  */
 118 #ifndef __func__
 119 #  if (__STDC_VERSION__ >= 199901L)
 120      /* C99 */
 121 #  elif defined(__SUNPRO_C) && defined(__C99FEATURES__)
 122      /* C99 */
 123 #  elif defined(__GNUC__)
 124 #    define __func__ __FUNCTION__
 125 #  elif defined(_MSC_VER)
 126 #    define __func__ __FUNCTION__
 127 #  else
 128 #    define __func__ "<unknown>"
 129 #  endif
 130 #endif
 131
 132
 133 /* Simple test case for debugging */
 134 #if 0
 135 static inline const char *
 136 test_c99_compat_h(const void * restrict a,
 137                   const void * restrict b)
 138 {
 139    return __func__;
 140 }
 141 #endif
 142
 143
 144 #endif /* _C99_COMPAT_H_ */