1 #ifndef __LINUX_COMPILER_H 2 #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." 3 #endif 4 5 /* Some compiler specific definitions are overwritten here 6 * for Clang compiler 7 */ 8 9 #ifdef uninitialized_var 10 #undef uninitialized_var 11 #define uninitialized_var(x) x = *(&(x)) 12 #endif 13 14 /* same as gcc, this was present in clang-2.6 so we can assume it works 15 * with any version that can compile the kernel 16 */ 17 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) 18 19 /* 20 * Not all versions of clang implement the the type-generic versions 21 * of the builtin overflow checkers. Fortunately, clang implements 22 * __has_builtin allowing us to avoid awkward version 23 * checks. Unfortunately, we don't know which version of gcc clang 24 * pretends to be, so the macro may or may not be defined. 25 */ 26 #undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 27 #if __has_builtin(__builtin_mul_overflow) && \ 28 __has_builtin(__builtin_add_overflow) && \ 29 __has_builtin(__builtin_sub_overflow) 30 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 31 #endif 32