LXR linux/tools/include/linux/compiler-gcc.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _TOOLS_LINUX_COMPILER_H_
   3#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
   4#endif
   5
   6/*
   7 * Common definitions for all gcc versions go here.
   8 */
   9#ifndef GCC_VERSION
  10#define GCC_VERSION (__GNUC__ * 10000           \
  11                     + __GNUC_MINOR__ * 100     \
  12                     + __GNUC_PATCHLEVEL__)
  13#endif
  14
  15#if GCC_VERSION >= 70000 && !defined(__CHECKER__)
  16# define __fallthrough __attribute__ ((fallthrough))
  17#endif
  18
  19#if GCC_VERSION >= 40300
  20# define __compiletime_error(message) __attribute__((error(message)))
  21#endif /* GCC_VERSION >= 40300 */
  22
  23/* &a[0] degrades to a pointer: a different type from an array */
  24#define __must_be_array(a)      BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
  25
  26#ifndef __pure
  27#define  __pure         __attribute__((pure))
  28#endif
  29#define  noinline       __attribute__((noinline))
  30#ifndef __packed
  31#define __packed        __attribute__((packed))
  32#endif
  33#ifndef __noreturn
  34#define __noreturn      __attribute__((noreturn))
  35#endif
  36#ifndef __aligned
  37#define __aligned(x)    __attribute__((aligned(x)))
  38#endif
  39#define __printf(a, b)  __attribute__((format(printf, a, b)))
  40#define __scanf(a, b)   __attribute__((format(scanf, a, b)))
  41
  42#if GCC_VERSION >= 50100
  43#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  44#endif
  45