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Use __builtin_offsetof for offsetof definition on gcc >= 4
This is required as gcc grows ever more pedantic with old age
and cavorts with standards bodies that like to create paradoxes.

ok kettenis@ miod@ millert@ espie@

/*	$OpenBSD: stddef.h,v 1.10 2009/09/22 21:40:02 jsg Exp $	*/
/*	$NetBSD: stddef.h,v 1.4 1994/10/26 00:56:26 cgd Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)stddef.h	5.5 (Berkeley) 4/3/91
 */

#ifndef _STDDEF_H_
#define _STDDEF_H_

#include <sys/cdefs.h>
#include <sys/_types.h>

#ifndef _PTRDIFF_T_DEFINED_
#define _PTRDIFF_T_DEFINED_
typedef	__ptrdiff_t	ptrdiff_t;
#endif

#ifndef	_SIZE_T_DEFINED_
#define	_SIZE_T_DEFINED_
typedef	__size_t	size_t;
#endif

/* in C++, wchar_t is a built-in type */
#if !defined(_WCHAR_T_DEFINED_) && !defined(__cplusplus)
#define _WCHAR_T_DEFINED_
typedef	__wchar_t	wchar_t;
#endif

#ifndef	_WINT_T_DEFINED_
#define	_WINT_T_DEFINED_
typedef	__wint_t	wint_t;
#endif

#ifndef	_MBSTATE_T_DEFINED_
#define	_MBSTATE_T_DEFINED_
typedef	__mbstate_t	mbstate_t;
#endif

#ifndef	NULL
#ifdef 	__GNUG__
#define NULL	__null
#else
#define	NULL	0L
#endif
#endif

#if __GNUC_PREREQ__(4, 0)
#define	offsetof(type, member)	__builtin_offsetof(type, member)
#else
#define	offsetof(type, member)	((size_t)(&((type *)0)->member))
#endif

#endif /* _STDDEF_H_ */