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g++-4 does not like &0->member, so we have to use the built-in offsetof(). 

g++-3 does not have a built-in offsetof(), but we cannot use the c version,
      otherwise we break with -Wold-style-cast.
Inspired by the DF version, but a bit different.
This commit is contained in:
christos 2006-08-21 15:02:23 +00:00
parent 7d30668340
commit a4f92031c6
1 changed files with 10 additions and 3 deletions
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13
include/stddef.h
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@ -1,4 +1,4 @@
/* $NetBSD: stddef.h,v 1.11 2006/08/21 14:09:43 skd Exp $ */
/* $NetBSD: stddef.h,v 1.12 2006/08/21 15:02:23 christos Exp $ */
/*-
* Copyright (c) 1990, 1993
@ -50,6 +50,13 @@ typedef _BSD_WCHAR_T_ wchar_t;
#include <sys/null.h>
#define offsetof(type, member) __builtin_offsetof(type,member)
#if __GNUC__ >= 4
#define offsetof(type, member) __builtin_offsetof(type, member)
#elif !defined(__cplusplus)
#define offsetof(type, member) ((size_t)(unsigned long)(&((type *)0)->member))
#else
#define offsetof(type, member) (reinterpret_cast<size_t> \
(&reinterpret_cast<const volatile char &>(static_cast<type *>(0)->member)))
#endif
#endif /* _STDDEF_H_ */