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