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Subject: Re: sparc: clang: error: unknown argument: '-mno-fpu'
To:     Arnd Bergmann <arnd@arndb.de>,
        Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     clang-built-linux <clang-built-linux@googlegroups.com>,
        open list <linux-kernel@vger.kernel.org>,
        lkft-triage@lists.linaro.org,
        sparclinux <sparclinux@vger.kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Anders Roxell <anders.roxell@linaro.org>,
        =?UTF-8?Q?Daniel_D=c3=adaz?= <daniel.diaz@linaro.org>
References: <CA+G9fYseDSQ2Vgg5Cb=8HHdpm56aeVQH0Vdx7JK1SktGpRRkgw@mail.gmail.com>
 <CAK8P3a3Za8N2-Hs02nG0CcGJ+RcTrR0UqDOesd8E6PmhYRR2_A@mail.gmail.com>
From:   John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Message-ID: <ebf12838-4525-a525-93bd-2229927e50ca@physik.fu-berlin.de>
Date:   Fri, 19 Mar 2021 12:37:52 +0100
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On 3/19/21 12:31 PM, Arnd Bergmann wrote:
> On Fri, Mar 19, 2021 at 8:36 AM Naresh Kamboju
> <naresh.kamboju@linaro.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@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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