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#ifdef __has_attribute
  31#if __has_attribute(disable_tail_calls)
  32#define __no_tail_call  __attribute__((disable_tail_calls))
  33#endif
  34#endif
  35#ifndef __no_tail_call
  36#if GCC_VERSION > 40201
  37#define __no_tail_call  __attribute__((optimize("no-optimize-sibling-calls")))
  38#else
  39#define __no_tail_call
  40#endif
  41#endif
  42#ifndef __packed
  43#define __packed        __attribute__((packed))
  44#endif
  45#ifndef __noreturn
  46#define __noreturn      __attribute__((noreturn))
  47#endif
  48#ifndef __aligned
  49#define __aligned(x)    __attribute__((aligned(x)))
  50#endif
  51#define __printf(a, b)  __attribute__((format(printf, a, b)))
  52#define __scanf(a, b)   __attribute__((format(scanf, a, b)))
  53
  54#if GCC_VERSION >= 50100
  55#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  56#endif
  57