1 #ifndef __LINUX_COMPILER_H
2 #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
5 /* Some compiler specific definitions are overwritten here
9 #ifdef uninitialized_var
10 #undef uninitialized_var
11 #define uninitialized_var(x) x = *(&(x))
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
17 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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.
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