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d9bddaa072
This will let us check the size of static array initializers. Also moved this macro definition and ARRAY_SIZE into a new "tricks.h" header, so that userspace utils can use it too. BUG=none BRANCH=none TEST=manual Built everything, tested on Link. Tried various assertions. Change-Id: I612891108ea37dbca3572e0f25ab54a7bc0ed860 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/49417 Reviewed-by: Randall Spangler <rspangler@chromium.org>
27 lines
795 B
C
27 lines
795 B
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Handy clever tricks */
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#ifndef __CROS_EC_TRICKS_H
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#define __CROS_EC_TRICKS_H
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/* Test an important condition at compile time, not run time */
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#define _BA1_(cond, line) \
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extern int __build_assertion_ ## line[1 - 2*!(cond)] \
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__attribute__ ((unused))
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#define _BA0_(c, x) _BA1_(c, x)
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#define BUILD_ASSERT(cond) _BA0_(cond, __LINE__)
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/* Number of elements in an array */
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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/* Just in case - http://gcc.gnu.org/onlinedocs/gcc/Offsetof.html */
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#ifndef offsetof
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#define offsetof(type, member) __builtin_offsetof(type, member)
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#endif
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#endif /* __CROS_EC_TRICKS_H */
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