linux-kernel - Re: sparc: clang: error: unknown argument: '-mno-fpu'

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Date:   Fri, 19 Mar 2021 12:37:52 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Arnd Bergmann <arnd@...db.de>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        sparclinux <sparclinux@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>
Subject: Re: sparc: clang: error: unknown argument: '-mno-fpu'

On 3/19/21 12:31 PM, Arnd Bergmann wrote:
> On Fri, Mar 19, 2021 at 8:36 AM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
>>
>> Linux mainline master build breaks for sparc defconfig.
>> There are multiple errors / warnings with clang-12 and clang-11 and 10.
>>  - sparc (defconfig) with clang-12, clang-11 and clang-10
>>  - sparc (tinyconfig) with clang-12, clang-11 and clang-10
>>  - sparc (allnoconfig) with clang-12, clang-11 and clang-10
>>
>> make --silent --keep-going --jobs=8
>> O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=sparc
>> CROSS_COMPILE=sparc64-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache
>> clang'
> 
> I don't think anyone has successfully built a sparc kernel with clang,
> and I don't
> think it's worth trying either, given how little upstream work the
> sparc port sees
> overall.

We'll get there. There are some other SPARC-related clang bugs that need
to be squashed first. We have made quite some improvements and it's actually
maintained by the community. Of course, we don't have a commercial backer
but that shouldn't be necessary for open source to work.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913