ObjFW  Diff

#else
# define OF_UNREACHABLE abort();
#endif

#if defined(__clang__) || OF_GCC_VERSION >= 406
# define OF_SENTINEL __attribute__((__sentinel__))
# define OF_NO_RETURN __attribute__((__noreturn__))
# define OF_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
#else
# define OF_SENTINEL
# define OF_NO_RETURN
#endif

#ifdef __clang__
# define OF_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
#else
# define OF_WARN_UNUSED_RESULT
#endif

#if __has_attribute(__unavailable__)
# define OF_UNAVAILABLE __attribute__((__unavailable__))
#else
# define OF_UNAVAILABLE