Attempting to use __diag_clang() and build with GCC results in a build error:
include/linux/compiler_types.h:468:38: error: 'ignore' undeclared (first use in this function); did you mean 'inode'? 468 | __diag_ ## compiler(version, ignore, option) | ^~~~~~ This error occurs because __diag_clang() is only defined in compiler-clang.h, which is only included when using clang as the compiler. This error has not been seen before because __diag_clang() has only been used in __diag_ignore_all(), which is defined in both compiler-clang.h and compiler-gcc.h. Add an empty stub for __diag_clang() in compiler_types.h, so that it is always defined and just becomes a no-op when using GCC. Fixes: f014a00bbeb0 ("compiler-clang.h: Add __diag infrastructure for clang") Signed-off-by: Nathan Chancellor <nat...@kernel.org> --- include/linux/compiler_types.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h index 3e64ec0f7ac8..fb0c3ff5497d 100644 --- a/include/linux/compiler_types.h +++ b/include/linux/compiler_types.h @@ -461,6 +461,10 @@ struct ftrace_likely_data { #define __diag_GCC(version, severity, string) #endif +#ifndef __diag_clang +#define __diag_clang(version, severity, string) +#endif + #define __diag_push() __diag(push) #define __diag_pop() __diag(pop) -- 2.44.0