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      1 /*	$NetBSD: build_bug.h,v 1.4 2021/12/19 11:14:34 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef	_LINUX_BUILD_BUG_H_
     30 #define	_LINUX_BUILD_BUG_H_
     31 
     32 #include <lib/libkern/libkern.h>
     33 
     34 /* Required to be false _or_ nonconstant.  */
     35 #define	BUILD_BUG_ON(EXPR)						      \
     36 	CTASSERT(__builtin_choose_expr(__builtin_constant_p(EXPR), !(EXPR), 1))
     37 
     38 /* Required to be constant _and_ true.  XXX Should take optional message.  */
     39 #define	static_assert(EXPR)		CTASSERT(EXPR)
     40 
     41 #define	BUILD_BUG()			do {} while (0)
     42 #define	BUILD_BUG_ON_MSG(EXPR,MSG)	BUILD_BUG_ON(EXPR)
     43 #define	BUILD_BUG_ON_INVALID(EXPR)	((void)sizeof((long)(EXPR)))
     44 #define	BUILD_BUG_ON_ZERO(EXPR)		((int)(0*sizeof(int[(EXPR) ? -1 : 1])))
     45 
     46 #endif	/* _LINUX_BUILD_BUG_H_ */
     47