On Thu, Aug 15, 2019 at 3:59 PM 'Nathan Huckleberry' via Clang Built Linux <clang-built-li...@googlegroups.com> wrote: > > Clang is updating to support -Wimplicit-fallthrough on C > https://reviews.llvm.org/D64838. Since clang does not > support the comment version of fallthrough annotations > this update causes an additional 50k warnings. Most > of these warnings (>49k) are duplicates from header files. > > This patch is intended to be reverted after the warnings > have been cleaned up. > > Signed-off-by: Nathan Huckleberry <nh...@google.com> > Suggested-by: Nathan Chancellor <natechancel...@gmail.com> > Reviewed-by: Nathan Chancellor <natechancel...@gmail.com> > --- > Changes v1->v2 > * Move code to preexisting ifdef > scripts/Makefile.extrawarn | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn > index a74ce2e3c33e..95973a1ee999 100644 > --- a/scripts/Makefile.extrawarn > +++ b/scripts/Makefile.extrawarn > @@ -70,5 +70,6 @@ KBUILD_CFLAGS += -Wno-initializer-overrides > KBUILD_CFLAGS += -Wno-format > KBUILD_CFLAGS += -Wno-sign-compare > KBUILD_CFLAGS += -Wno-format-zero-length > +KBUILD_CFLAGS += $(call cc-option,-Wno-implicit-fallthrough)
Clang seems to support -Wno-implicit-fallthrough since 3.2. You can remove the cc-option, since you'll need a newer clang than that to build the kernel. -- Thanks, ~Nick Desaulniers
