include/linux/compiler-gcc.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _TOOLS_LINUX_COMPILER_H_
0003 #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
0004 #endif
0005
0006 /*
0007  * Common definitions for all gcc versions go here.
0008  */
0009 #ifndef GCC_VERSION
0010 #define GCC_VERSION (__GNUC__ * 10000       \
0011              + __GNUC_MINOR__ * 100 \
0012              + __GNUC_PATCHLEVEL__)
0013 #endif
0014
0015 #if GCC_VERSION >= 70000 && !defined(__CHECKER__)
0016 # define __fallthrough __attribute__ ((fallthrough))
0017 #endif
0018
0019 #if __has_attribute(__error__)
0020 # define __compiletime_error(message) __attribute__((error(message)))
0021 #endif
0022
0023 /* &a[0] degrades to a pointer: a different type from an array */
0024 #define __must_be_array(a)  BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
0025
0026 #ifndef __pure
0027 #define  __pure     __attribute__((pure))
0028 #endif
0029 #define  noinline   __attribute__((noinline))
0030 #ifndef __packed
0031 #define __packed    __attribute__((packed))
0032 #endif
0033 #ifndef __noreturn
0034 #define __noreturn  __attribute__((noreturn))
0035 #endif
0036 #ifndef __aligned
0037 #define __aligned(x)    __attribute__((aligned(x)))
0038 #endif
0039 #define __printf(a, b)  __attribute__((format(printf, a, b)))
0040 #define __scanf(a, b)   __attribute__((format(scanf, a, b)))