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