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11f154ca86
This addresses a -Wunused-but-set-variable warning in the gcc builds. No functional change intended. Reported by: Jenkins (cherry picked from commit 344a04ad2c5e62b2905bc2f8b6f992ae590403fd)
65 lines
2.8 KiB
C
65 lines
2.8 KiB
C
/*-
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* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
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* Copyright (c) 2018 Johannes Lundberg <johalun0@gmail.com>
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* Copyright (c) 2021 The FreeBSD Foundation
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* Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
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* Copyright (c) 2023 Serenity Cyber Security, LLC
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*
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* Portions of this software were developed by Bjoern A. Zeeb
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_BUILD_BUG_H_
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#define _LINUXKPI_LINUX_BUILD_BUG_H_
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#include <sys/param.h>
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#include <linux/compiler.h>
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/*
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* BUILD_BUG_ON() can happen inside functions where _Static_assert() does not
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* seem to work. Use old-schoold-ish CTASSERT from before commit
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* a3085588a88fa58eb5b1eaae471999e1995a29cf but also make sure we do not
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* end up with an unused typedef or variable. The compiler should optimise
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* it away entirely.
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*/
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#define _O_CTASSERT(x) _O__CTASSERT(x, __LINE__)
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#define _O__CTASSERT(x, y) _O___CTASSERT(x, y)
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#define _O___CTASSERT(x, y) while (0) { \
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typedef char __assert_line_ ## y[(x) ? 1 : -1]; \
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__assert_line_ ## y _x __unused; \
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_x[0] = '\0'; \
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}
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#define BUILD_BUG() do { CTASSERT(0); } while (0)
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#define BUILD_BUG_ON(x) do { _O_CTASSERT(!(x)) } while (0)
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#define BUILD_BUG_ON_MSG(x, msg) BUILD_BUG_ON(x)
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#define BUILD_BUG_ON_NOT_POWER_OF_2(x) BUILD_BUG_ON(!powerof2(x))
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#define BUILD_BUG_ON_INVALID(expr) while (0) { (void)(expr); }
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#define BUILD_BUG_ON_ZERO(x) ((int)sizeof(struct { int:-((x) != 0); }))
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#define static_assert(x, ...) __static_assert(x, ##__VA_ARGS__, #x)
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#define __static_assert(x, msg, ...) _Static_assert(x, msg)
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#endif
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