include/linux/compiler-clang.h

   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 /*
  29  * Not all versions of clang implement the the type-generic versions
  30  * of the builtin overflow checkers. Fortunately, clang implements
  31  * __has_builtin allowing us to avoid awkward version
  32  * checks. Unfortunately, we don't know which version of gcc clang
  33  * pretends to be, so the macro may or may not be defined.
  34  */
  35 #undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
  36 #if __has_builtin(__builtin_mul_overflow) && \
  37     __has_builtin(__builtin_add_overflow) && \
  38     __has_builtin(__builtin_sub_overflow)
  39 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  40 #endif