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 #define CLANG_VERSION (__clang_major__ * 10000  \
   7                      + __clang_minor__ * 100    \
   8                      + __clang_patchlevel__)
   9
  10 #if CLANG_VERSION < 100001
  11 # error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
  12 #endif
  13
  14 /* Compiler specific definitions for Clang compiler */
  15
  16 /* same as gcc, this was present in clang-2.6 so we can assume it works
  17  * with any version that can compile the kernel
  18  */
  19 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
  20
  21 /* all clang versions usable with the kernel support KASAN ABI version 5 */
  22 #define KASAN_ABI_VERSION 5
  23
  24 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
  25 /* Emulate GCC's __SANITIZE_ADDRESS__ flag */
  26 #define __SANITIZE_ADDRESS__
  27 #define __no_sanitize_address \
  28                 __attribute__((no_sanitize("address", "hwaddress")))
  29 #else
  30 #define __no_sanitize_address
  31 #endif
  32
  33 #if __has_feature(thread_sanitizer)
  34 /* emulate gcc's __SANITIZE_THREAD__ flag */
  35 #define __SANITIZE_THREAD__
  36 #define __no_sanitize_thread \
  37                 __attribute__((no_sanitize("thread")))
  38 #else
  39 #define __no_sanitize_thread
  40 #endif
  41
  42 #if __has_feature(undefined_behavior_sanitizer)
  43 /* GCC does not have __SANITIZE_UNDEFINED__ */
  44 #define __no_sanitize_undefined \
  45                 __attribute__((no_sanitize("undefined")))
  46 #else
  47 #define __no_sanitize_undefined
  48 #endif
  49
  50 /*
  51  * Not all versions of clang implement the type-generic versions
  52  * of the builtin overflow checkers. Fortunately, clang implements
  53  * __has_builtin allowing us to avoid awkward version
  54  * checks. Unfortunately, we don't know which version of gcc clang
  55  * pretends to be, so the macro may or may not be defined.
  56  */
  57 #if __has_builtin(__builtin_mul_overflow) && \
  58     __has_builtin(__builtin_add_overflow) && \
  59     __has_builtin(__builtin_sub_overflow)
  60 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
  61 #endif
  62
  63 #if __has_feature(shadow_call_stack)
  64 # define __noscs        __attribute__((__no_sanitize__("shadow-call-stack")))
  65 #endif