On Mon, Jul 30, 2018 at 02:34:11PM -0700, Nick Desaulniers wrote: > These are needed for doing proper version checks, though feature > detection via __has_attribute, __has_builtin, and __has_feature should > be preferred, see: > https://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros > > Also adds __diag support, for generating compiler version specific > _Pragma()'s. > > __diag support based on commit 8793bb7f4a9d ("kbuild: add macro for > controlling warnings to linux/compiler.h") > > Cc: stable@xxxxxxxxxxxxxxx # 4.17, 4.14, 4.9, 4.4 > Suggested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Tested-and-reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > --- > include/linux/compiler-clang.h | 19 +++++++++++++++++++ > include/linux/compiler_types.h | 4 ++++ > 2 files changed, 23 insertions(+) > > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h > index 7087446c24c8..9442e07a361e 100644 > --- a/include/linux/compiler-clang.h > +++ b/include/linux/compiler-clang.h > @@ -7,6 +7,10 @@ > * for Clang compiler > */ > > +#define CLANG_VERSION (__clang_major__ * 10000 \ > + + __clang_minor__ * 100 \ > + + __clang_patchlevel__) > + I know this was done to be consistent with GCC_VERSION but certain toolchains may set the patch level to the SVN revision (at least that's what it appears to be) like AOSP's clang-4053586, which would make CLANG_VERSION 350080. For this particular warning, it doesn't matter since Clang has supported it since 2011 and Clang 5.0 isn't supported in this tree anyways but maybe relying on just __clang_major__ below is more ideal. Other than that, patch functions just as it should. > #ifdef uninitialized_var > #undef uninitialized_var > #define uninitialized_var(x) x = *(&(x)) > @@ -46,3 +50,18 @@ > __has_builtin(__builtin_sub_overflow) > #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1 > #endif > + > +#define __diag_str1(s) #s > +#define __diag_str(s) __diag_str1(s) > +#define __diag(s) _Pragma(__diag_str(clang diagnostic s)) > +#define __diag_CLANG_ignore ignored > +#define __diag_CLANG_warn warning > +#define __diag_CLANG_error error > +#define __diag_CLANG(version, severity, s) \ > + __diag_CLANG_ ## version(__diag_CLANG_ ## severity s) > + > +#if CLANG_VERSION >= 70000 > +#define __diag_CLANG_7(s) __diag(s) > +#else > +#define __diag_CLANG_7(s) > +#endif > diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h > index a8ba6b04152c..a04e6bd63476 100644 > --- a/include/linux/compiler_types.h > +++ b/include/linux/compiler_types.h > @@ -279,6 +279,10 @@ 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) > > -- > 2.18.0.345.g5c9ce644c3-goog >
