compiler.h

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/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only */
 
#ifndef _COMMONLIB_BSD_COMPILER_H_
#define _COMMONLIB_BSD_COMPILER_H_
 
#ifndef __packed
#if defined(__WIN32) || defined(__WIN64)
#define __packed __attribute__((gcc_struct, packed))
#else
#define __packed __attribute__((packed))
#endif
#endif
 
#ifndef __aligned
#define __aligned(x) __attribute__((aligned(x)))
#endif
 
#ifndef __always_unused
#define __always_unused __attribute__((unused))
#endif
 
#ifndef __must_check
#define __must_check __attribute__((warn_unused_result))
#endif
 
#ifndef __weak
#define __weak __attribute__((weak))
#endif
 
#ifndef __noreturn
#define __noreturn __attribute__((noreturn))
#endif
 
#ifndef __always_inline
#define __always_inline inline __attribute__((always_inline))
#endif
 
#ifndef __fallthrough
#define __fallthrough __attribute__((__fallthrough__))
#endif
 
/* This evaluates to the type of the first expression, unless that is constant
   in which case it evaluates to the type of the second. This is useful when
   assigning macro parameters to temporary variables, because that would
   normally circumvent the special loosened type promotion rules for integer
   literals. By using this macro, the promotion can happen at the time the
   literal is assigned to the temporary variable. If the literal doesn't fit in
   the chosen type, -Werror=overflow will catch it, so this should be safe. */
#define __TYPEOF_UNLESS_CONST(expr, fallback_expr) __typeof__( \
        __builtin_choose_expr(__builtin_constant_p(expr), fallback_expr, expr))
 
/* This creates a unique local variable name for use in macros. */
#define __TMPNAME_3(i) __tmpname_##i
#define __TMPNAME_2(i) __TMPNAME_3(i)
#define __TMPNAME __TMPNAME_2(__COUNTER__)
 
#endif