Re: [PATCH] kbuild: Require W=1 for -Wimplicit-fallthrough with clang

[Miguel Ojeda]

On Fri, Aug 16, 2019 at 1:05 AM Nick Desaulniers
<ndesaulniers@xxxxxxxxxx> wrote:
>
> On Thu, Aug 15, 2019 at 3:59 PM Miguel Ojeda
> <miguel.ojeda.sandonis@xxxxxxxxx> wrote:
> >
> > On Thu, Aug 15, 2019 at 10:45 PM Nathan Chancellor
> > <natechancellor@xxxxxxxxx> wrote:
> > > * Revert commit bfd77145f35c ("Makefile: Convert -Wimplicit-fallthrough=3
> > > to just -Wimplicit-fallthrough for clang") for the time being and just
> > > rely on adding -Wimplicit-fallthrough to KCFLAGS for testing.
> >
> > I would avoid applying commits that will have to be reverted just for
> > Clang, particularly since it is not fully supported yet.
>
> "not fully supported yet" you say? *drops monocle*
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAINTAINERS?h=v5.3-rc4#n4001

By fully supported I mean it already works and people can rely on it
out of the box using a released version of Clang/LLVM. Is that the
case already? If so, many places need updating!

  * include/linux/compiler-clang.h should check for the minimum
supported version
  * Documentation/process/programming-language.rst should be updated
  * https://github.com/ClangBuiltLinux/linux/wiki does not mention anything

etc.

Cheers,
Miguel