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Date:   Thu, 11 Apr 2019 10:46:30 -0700
From:   Nick Desaulniers <>
To:     Arnd Bergmann <>
Cc:     Martin Schwidefsky <>,
        Heiko Carstens <>,
        Vasily Gorbik <>,,
        Nathan Chancellor <>,
        linux-s390 <>,
        Masahiro Yamada <>,
        Philipp Rudo <>,
        Tony Krowiak <>,
        LKML <>
Subject: Re: [PATCH 1/2] s390: only build for new CPUs with clang

On Thu, Apr 11, 2019 at 3:18 AM Arnd Bergmann <> wrote:
> On Thu, Apr 11, 2019 at 12:20 AM 'Nick Desaulniers' via Clang Built
> Linux <> wrote:
> >
> > On Wed, Apr 10, 2019 at 1:13 PM Arnd Bergmann <> wrote:
> > >
> > > llvm does does not understand -march=z9-109 and older target
> >
> > Please file bugs for these in LLVM's issue tracker.  It might be
> > possible to enable these additional architecture variants if they're
> > similar to existing ones and simply unrecognized.  IIRC, we had this
> > issue with armv7 variants.
> I really don't see that as necessary here. While generally speaking,
> it would be nice to support the widest possible range of hardware,
> and it would not be hard to add this support, it seems highly unlikely
> that anyone would actually want to use that in case of s390.
> The last enterprise distros to support z9 were SLES11 (end of life as
> of last month) and RHEL6 (ending its 10 year life next year). Anyone
> who is still on those releases will probably not install a brand new
> compiler, and anyone who is on newer releases won't run on prehistoric
> hardware.

Are those machine variants worth dropping kernel support for then?

> Debian still runs on very old hardware in theory, but even there you'd
> have a hard time finding someone to test the output of the compiler
> on an old machine.
>        Arnd

~Nick Desaulniers

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