musl/include/stddef.h
Rich Felker a7c1f9727a use __builtin_offsetof to implement offsetof when possible
apparently recent gcc versions have intentionally broken the
traditional definition by treating it as a non-constant expression.
the traditional definition may also be problematic for c++ programs.
2012-12-05 00:00:42 -05:00

24 lines
410 B
C

#ifndef _STDDEF_H
#define _STDDEF_H
#undef NULL
#ifdef __cplusplus
#define NULL 0
#else
#define NULL ((void*)0)
#endif
#define __NEED_ptrdiff_t
#define __NEED_size_t
#define __NEED_wchar_t
#include <bits/alltypes.h>
#if __GNUC__ > 3
#define offsetof(type, member) __builtin_offsetof(type, member)
#else
#define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
#endif
#endif