[PATCH 6/6] [RESEND] drm/amdgpu: work around llvm bug #42576

[Nathan Chancellor]

On Wed, Oct 02, 2019 at 09:51:37AM -0700, 'Nick Desaulniers' via Clang Built Linux wrote:
> > Apparently this bug is still present in both the released clang-9
> > and the current development version of clang-10.
> > I was hoping we would not need a workaround in clang-9+, but
> > it seems that we do.
> 
> I think I'd rather:
> 1. mark AMDGPU BROKEN if CC_IS_CLANG. There are numerous other issues building
>    a working driver here.

The only reason I am not thrilled about this is we will lose out on
warning coverage while the compiler bug gets fixed. I think the AMDGPU
drivers have been the single biggest source of clang warnings.

I think something like:

depends on CC_IS_GCC || (CC_IS_CLANG && COMPILE_TEST)

would end up avoiding the runtime issues and give us warning coverage.
The only issue is that we would still need this patch...

Cheers,
Nathan