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#ifdef __GNUC__
# define OF_INLINE inline __attribute__((__always_inline__))
# define OF_LIKELY(cond) (__builtin_expect(!!(cond), 1))
# define OF_UNLIKELY(cond) (__builtin_expect(!!(cond), 0))
# define OF_CONST_FUNC __attribute__((__const__))
# define OF_NO_RETURN_FUNC __attribute__((__noreturn__))
# define OF_WEAK_REF(sym) __attribute__((__weakref__(sym)))
# ifndef OF_DJGPP
# define OF_VISIBILITY_HIDDEN __attribute__((__visibility__("hidden")))
# else
# define OF_VISIBILITY_HIDDEN
# endif
#else
# define OF_INLINE inline
# define OF_LIKELY(cond) (cond)
# define OF_UNLIKELY(cond) (cond)
# define OF_CONST_FUNC
# define OF_NO_RETURN_FUNC
# define OF_WEAK_REF(sym)
#endif
#ifndef OF_DJGPP
# define OF_VISIBILITY_HIDDEN __attribute__((__visibility__("hidden")))
#else
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