ObjFW  Check-in [60214356c2]

# else
#  /* Hopefully no arch needs more than 16 byte alignment */
#  define OF_BIGGEST_ALIGNMENT 16
# endif
#endif

#ifdef __GNUC__
# define __GCC_VERSION__ (__GNUC__ * 100 + __GNUC_MINOR__)
# define OF_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
#else
# define __GCC_VERSION__ 0
# define OF_GCC_VERSION 0
#endif

#ifndef __has_feature
# define __has_feature(x) 0
#endif

#ifndef __has_attribute

#if __has_feature(objc_kindof)
# define OF_KINDOF(cls) __kindof cls
#else
# define OF_KINDOF(cls) id
#endif

#if defined(__clang__) || __GCC_VERSION__ >= 405
#if defined(__clang__) || OF_GCC_VERSION >= 405
# define OF_UNREACHABLE __builtin_unreachable();
#else
# define OF_UNREACHABLE abort();
#endif

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