src/cc-compat.h

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_cc_compat_h__
   8 #define INCLUDE_cc_compat_h__
   9
  10 #include <stdarg.h>
  11
  12 /*
  13  * See if our compiler is known to support flexible array members.
  14  */
  15 #ifndef GIT_FLEX_ARRAY
  16 #       if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
  17 #               define GIT_FLEX_ARRAY /* empty */
  18 #       elif defined(__GNUC__)
  19 #               if (__GNUC__ >= 3)
  20 #                       define GIT_FLEX_ARRAY /* empty */
  21 #               else
  22 #                       define GIT_FLEX_ARRAY 0 /* older GNU extension */
  23 #               endif
  24 #       endif
  25
  26 /* Default to safer but a bit wasteful traditional style */
  27 #       ifndef GIT_FLEX_ARRAY
  28 #               define GIT_FLEX_ARRAY 1
  29 #       endif
  30 #endif
  31
  32 #if defined(__GNUC__)
  33 #       define GIT_ALIGN(x,size) x __attribute__ ((aligned(size)))
  34 #elif defined(_MSC_VER)
  35 #       define GIT_ALIGN(x,size) __declspec(align(size)) x
  36 #else
  37 #       define GIT_ALIGN(x,size) x
  38 #endif
  39
  40 #if defined(__GNUC__)
  41 # define GIT_UNUSED(x)                                                         \
  42         do {                                                                   \
  43                 __typeof__(x) _unused __attribute__((unused));                 \
  44                 _unused = (x);                                                 \
  45         } while (0)
  46 #else
  47 # define GIT_UNUSED(x) ((void)(x))
  48 #endif
  49
  50 /* Define the printf format specifier to use for size_t output */
  51 #if defined(_MSC_VER) || defined(__MINGW32__)
  52
  53 /* Visual Studio 2012 and prior lack PRId64 entirely */
  54 #       ifndef PRId64
  55 #               define PRId64 "I64d"
  56 #       endif
  57
  58 /* The first block is needed to avoid warnings on MingW amd64 */
  59 #       if (SIZE_MAX == ULLONG_MAX)
  60 #               define PRIuZ "I64u"
  61 #               define PRIxZ "I64x"
  62 #               define PRIXZ "I64X"
  63 #               define PRIdZ "I64d"
  64 #       else
  65 #               define PRIuZ "Iu"
  66 #               define PRIxZ "Ix"
  67 #               define PRIXZ "IX"
  68 #               define PRIdZ "Id"
  69 #       endif
  70
  71 #else
  72 #       define PRIuZ "zu"
  73 #       define PRIxZ "zx"
  74 #       define PRIXZ "zX"
  75 #       define PRIdZ "zd"
  76 #endif
  77
  78 /* Micosoft Visual C/C++ */
  79 #if defined(_MSC_VER)
  80 /* disable "deprecated function" warnings */
  81 #       pragma warning ( disable : 4996 )
  82 /* disable "conditional expression is constant" level 4 warnings */
  83 #       pragma warning ( disable : 4127 )
  84 #endif
  85
  86 #if defined (_MSC_VER)
  87         typedef unsigned char bool;
  88 #       ifndef true
  89 #               define true 1
  90 #       endif
  91 #       ifndef false
  92 #               define false 0
  93 #       endif
  94 #else
  95 #       include <stdbool.h>
  96 #endif
  97
  98 #ifndef va_copy
  99 #       ifdef __va_copy
 100 #               define va_copy(dst, src) __va_copy(dst, src)
 101 #       else
 102 #               define va_copy(dst, src) ((dst) = (src))
 103 #       endif
 104 #endif
 105
 106 #endif