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."
7 * Common definitions for all gcc versions go here.
10 #define GCC_VERSION (__GNUC__ * 10000 \
11 + __GNUC_MINOR__ * 100 \
12 + __GNUC_PATCHLEVEL__)
15 #if GCC_VERSION >= 70000 && !defined(__CHECKER__)
16 # define __fallthrough __attribute__ ((fallthrough))
19 #if GCC_VERSION >= 40300
20 # define __compiletime_error(message) __attribute__((error(message)))
21 #endif /* GCC_VERSION >= 40300 */
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]))
27 #define __pure __attribute__((pure))
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))
35 #ifndef __no_tail_call
36 #if GCC_VERSION > 40201
37 #define __no_tail_call __attribute__((optimize("no-optimize-sibling-calls")))
39 #define __no_tail_call
43 #define __packed __attribute__((packed))
46 #define __noreturn __attribute__((noreturn))
49 #define __aligned(x) __attribute__((aligned(x)))
51 #define __printf(a, b) __attribute__((format(printf, a, b)))
52 #define __scanf(a, b) __attribute__((format(scanf, a, b)))
54 #if GCC_VERSION >= 50100
55 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1