44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/*
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*
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* Copyright 2017 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __COMPILER_H__
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#define __COMPILER_H__
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#if defined(__WIN32) || defined(__WIN64)
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#define __packed __attribute__((gcc_struct, packed))
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#else
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#define __packed __attribute__((packed))
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#endif
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#define __aligned(x) __attribute__((aligned(x)))
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#define __always_unused __attribute__((unused))
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#define __must_check __attribute__((warn_unused_result))
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/* This evaluates to the type of the first expression, unless that is constant
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in which case it evalutates to the type of the second. This is useful when
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assigning macro parameters to temporary variables, because that would
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normally circumvent the special loosened type promotion rules for integer
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literals. By using this macro, the promotion can happen at the time the
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literal is assigned to the temporary variable. If the literal doesn't fit in
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the chosen type, -Werror=overflow will catch it, so this should be safe. */
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#define __TYPEOF_UNLESS_CONST(expr, fallback_expr) typeof( \
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__builtin_choose_expr(__builtin_constant_p(expr), fallback_expr, expr))
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/* This creates a unique local variable name for use in macros. */
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#define __TMPNAME_3(i) __tmpname_##i
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#define __TMPNAME_2(i) __TMPNAME_3(i)
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#define __TMPNAME __TMPNAME_2(__COUNTER__)
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#endif
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