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