compat/cc.h

   1 #ifndef COMPAT__CC_H
   2 #define COMPAT__CC_H
   3
   4 /*
   5  * this allows us to take advantage of special gcc features while still
   6  * allowing other compilers to compile:
   7  *
   8  * example taken from: http://rlove.org/log/2005102601
   9  */
  10
  11 #if defined(__GNUC__) && (__GNUC__ >= 3)
  12 #  define CONST __attribute__ ((const))
  13 #  define DEPRECATED __attribute__ ((deprecated))
  14 #  define MUST_CHECK __attribute__ ((warn_unused_result))
  15 #  define NORETURN __attribute__ ((noreturn))
  16 #  define PACKED __attribute__ ((packed))
  17 /* these are very useful for type checking */
  18 #  define PRINTF __attribute__ ((format(printf,1,2)))
  19 #  define DPRINTF __attribute__ ((format(printf,2,3)))
  20 #  define PURE __attribute__ ((pure))
  21 #  define UNUSED __attribute__ ((unused))
  22 #  define USED __attribute__ ((used))
  23 /* #  define inline inline __attribute__ ((always_inline)) */
  24 #  define NOINLINE __attribute__ ((noinline))
  25 #  define likely(x) __builtin_expect (!!(x), 1)
  26 #  define unlikely(x) __builtin_expect (!!(x), 0)
  27 #else /* __GNUC__ || __GNUC__ < 3 */
  28 #  define CONST
  29 #  define DEPRECATED
  30 #  define MALLOC
  31 #  define MUST_CHECK
  32 #  define NORETURN
  33 #  define PACKED
  34 #  define PRINTF
  35 #  define DPRINTF
  36 #  define PURE
  37 #  define UNUSED
  38 #  define USED
  39 #  define NOINLINE
  40 #  define likely(x) (x)
  41 #  define unlikely(x) (x)
  42 #endif /* __GNUC__ && __GNUC__ >= 3 */
  43
  44 #endif /* COMPAT__CC_H */