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Date:   Thu, 11 Jul 2019 10:30:30 -0700
From:   Nathan Chancellor <natechancellor@gmail.com>
To:     Jason Gunthorpe <jgg@ziepe.ca>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Bernard Metzler <BMT@zurich.ibm.com>,
        Doug Ledford <dledford@redhat.com>, linux-rdma@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: [PATCH] rdma/siw: Use proper enumerated type in map_cqe_status
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On Thu, Jul 11, 2019 at 02:18:08PM -0300, Jason Gunthorpe wrote:
> On Thu, Jul 11, 2019 at 10:16:44AM -0700, Nick Desaulniers wrote:
> > On Thu, Jul 11, 2019 at 6:39 AM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> > >
> > > On Thu, Jul 11, 2019 at 01:14:34AM -0700, Nathan Chancellor wrote:
> > > > Maybe time to start plumbing Clang into your test flow until it can get
> > > > intergrated with more CI setups? :) It can catch some pretty dodgy
> > > > behavior that GCC doesn't:
> > >
> > > I keep asking how to use clang to build the kernel and last I was told
> > > it still wasn't ready..
> > >
> > > Is it ready now? Is there some flow that will compile with clang
> > > warning free, on any arch? (at least the portion of the kernel I check)
> > 
> > $ make CC=clang ...
> > 
> > Let us know if you find something we haven't already.
> > https://clangbuiltlinux.github.io/
> > https://github.com/ClangBuiltLinux/linux/issues
> 
> What clang version?
> 
> Jason

You'll need clang-9 for x86 because of the asm-goto requirement (or a
selective set of reverts for clang-8) but everything else should be
good with clang-8:

https://travis-ci.com/ClangBuiltLinux/continuous-integration/builds/118745131

We wrote a Python script that builds an LLVM 9 toolchain suitable for
kernel development that is self contained (doesn't install anything to
your system):

https://github.com/ClangBuiltLinux/tc-build

Let me know if there are any issues with it if you give it a go, I've
already fixed one from Thomas Gleixner:

https://lore.kernel.org/lkml/alpine.DEB.2.21.1906262140570.32342@nanos.tec.linutronix.de/

Cheers,
Nathan