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Message-ID: <20191002170733.GB1076951@archlinux-threadripper>
Date: Wed, 2 Oct 2019 10:07:33 -0700
From: Nathan Chancellor <natechancellor@...il.com>
To: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: arnd@...db.de, David1.Zhou@....com, Hawking.Zhang@....com,
airlied@...ux.ie, alexander.deucher@....com,
amd-gfx@...ts.freedesktop.org, christian.koenig@....com,
clang-built-linux@...glegroups.com, daniel@...ll.ch,
dri-devel@...ts.freedesktop.org, le.ma@....com,
linux-kernel@...r.kernel.org, ray.huang@....com
Subject: Re: [PATCH 6/6] [RESEND] drm/amdgpu: work around llvm bug #42576
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
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