1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_COMPILER_TYPES_H 3 #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." 4 #endif 5 6 /* Some compiler specific definitions are overwritten here 7 * for Clang compiler 8 */ 9 10 #ifdef uninitialized_var 11 #undef uninitialized_var 12 #define uninitialized_var(x) x = *(&(x)) 13 #endif 14 15 /* same as gcc, this was present in clang-2.6 so we can assume it works 16 * with any version that can compile the kernel 17 */ 18 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) 19 20 #undef __no_sanitize_address 21 #define __no_sanitize_address __attribute__((no_sanitize("address"))) 22 23 /* Clang doesn't have a way to turn it off per-function, yet. */ 24 #ifdef __noretpoline 25 #undef __noretpoline 26 #endif 27 28 #ifdef CONFIG_LTO_CLANG 29 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 30 #define __norecordmcount \ 31 __attribute__((__section__(".text..ftrace"))) 32 #endif 33 34 #define __nocfi __attribute__((no_sanitize("cfi"))) 35 #endif 36 37 /* 38 * Not all versions of clang implement the the type-generic versions 39 * of the builtin overflow checkers. Fortunately, clang implements 40 * __has_builtin allowing us to avoid awkward version 41 * checks. Unfortunately, we don't know which version of gcc clang 42 * pretends to be, so the macro may or may not be defined. 43 */ 44 #undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 45 #if __has_builtin(__builtin_mul_overflow) && \ 46 __has_builtin(__builtin_add_overflow) && \ 47 __has_builtin(__builtin_sub_overflow) 48 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 49 #endif 50