tools/include/linux/compiler-gcc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _TOOLS_LINUX_COMPILER_H_
   3 #error "Please do not 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 __has_attribute(__fallthrough__)
  16 # define fallthrough                    __attribute__((__fallthrough__))
  17 #else
  18 # define fallthrough                    do {} while (0)  /* fallthrough */
  19 #endif
  20
  21 #if __has_attribute(__error__)
  22 # define __compiletime_error(message) __attribute__((error(message)))
  23 #endif
  24
  25 /* &a[0] degrades to a pointer: a different type from an array */
  26 #define __must_be_array(a)      BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
  27
  28 #ifndef __pure
  29 #define  __pure         __attribute__((pure))
  30 #endif
  31 #define  noinline       __attribute__((noinline))
  32 #ifndef __packed
  33 #define __packed        __attribute__((packed))
  34 #endif
  35 #ifndef __noreturn
  36 #define __noreturn      __attribute__((noreturn))
  37 #endif
  38 #ifndef __aligned
  39 #define __aligned(x)    __attribute__((aligned(x)))
  40 #endif
  41 #define __printf(a, b)  __attribute__((format(printf, a, b)))
  42 #define __scanf(a, b)   __attribute__((format(scanf, a, b)))