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Date:   Wed, 26 Jun 2019 17:18:37 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nathan Chancellor <natechancellor@...il.com>
cc:     Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Shawn Landden <shawn@....icu>,
        clang-built-linux@...glegroups.com,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] perf/x86/intel: Mark expected switch fall-throughs

On Tue, 25 Jun 2019, Nathan Chancellor wrote:
> On Tue, Jun 25, 2019 at 11:47:06PM +0200, Thomas Gleixner wrote:
> > On Tue, 25 Jun 2019, Nathan Chancellor wrote:
> > > On Tue, Jun 25, 2019 at 09:53:09PM +0200, Thomas Gleixner wrote:
> > > > 
> > > > But can the script please check for a minimal clang version required to
> > > > build that thing.
> > > > 
> > > > The default clang-3.8 which is installed on Debian stretch explodes. The
> > > > 6.0 variant from backports works as advertised.
> > > > 
> > > 
> > > Hmmm interesting, I test a lot of different distros using Docker
> > > containers to make sure the script works universally and that includes
> > > Debian stretch, which is the stress tester because all of the packages
> > > are older. I install the following packages then run the following
> > > command and it works fine for me (just tested):
> > > 
> > > $ apt update && apt install -y --no-install-recommends ca-certificates \
> > > ccache clang cmake curl file gcc g++ git make ninja-build python3 \
> > > texinfo zlib1g-dev
> > > $ ./build-llvm.py
> > > 
> > > If you could give me a build log, I'd be happy to look into it and see
> > > what I can do.
> > 
> > I can produce one tomorrow.

tarball with log and the preprocessed source and run scripts:

    https://tglx.de/~tglx/tc-crash.tar.bz2

The machine runs up to date debian stretch which has backports enabled and
I just used the install command from the github project page you linked
to. Getting started section.

Thanks,

	tglx

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