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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-06-22 22:20:35 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-06-22 22:20:35 +0300 |
| commit | 7731b8bc94e599c9a79e428f3359ff2c34b7576a (patch) | |
| tree | 879f18ccbe274122f2d4f095b43cbc7f953e0ada /include/linux/compiler-clang.h | |
| parent | 48e315618dc4dc8904182cd221e3d395d5d97005 (diff) | |
| parent | 9ffc59d57228d74809700be6f7ecb1db10292f05 (diff) | |
| download | linux-7731b8bc94e599c9a79e428f3359ff2c34b7576a.tar.xz | |
Merge branch 'linus' into x86/urgent
Required to queue a dependent fix.
Diffstat (limited to 'include/linux/compiler-clang.h')
| -rw-r--r-- | include/linux/compiler-clang.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h index 7d98e263e048..7087446c24c8 100644 --- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -32,3 +32,17 @@ #ifdef __noretpoline #undef __noretpoline #endif + +/* + * Not all versions of clang implement the the type-generic versions + * of the builtin overflow checkers. Fortunately, clang implements + * __has_builtin allowing us to avoid awkward version + * checks. Unfortunately, we don't know which version of gcc clang + * pretends to be, so the macro may or may not be defined. + */ +#undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW +#if __has_builtin(__builtin_mul_overflow) && \ + __has_builtin(__builtin_add_overflow) && \ + __has_builtin(__builtin_sub_overflow) +#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 +#endif |