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From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Tue, 15 Feb 2022 11:18:36 -0800
Message-ID: <CAKwvOdn3fRni0RVbvE-sft9ce0mNrxv+9cDYrhGWVb68SD1k3w@mail.gmail.com>
Subject: Re: arm64: clang-nightly: net/ipv4/tcp_input.c: clang: error: clang
 frontend command failed with exit code 139
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     open list <linux-kernel@vger.kernel.org>, llvm@lists.linux.dev,
        Nathan Chancellor <nathan@kernel.org>
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On Tue, Feb 15, 2022 at 11:10 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> On Mon, Feb 14, 2022 at 7:35 AM Nathan Chancellor <nathan@kernel.org> wrote:
> >
> > Hi Naresh,
> >
> > On Mon, Feb 14, 2022 at 12:27:17PM +0530, Naresh Kamboju wrote:
> > > On Linux mainline master branch with arm64 clang-nightly build failed
> > > due to following errors and warnings.
> > >
> > > make --silent --keep-going --jobs=8
> > > O=/home/tuxbuild/.cache/tuxmake/builds/current LLVM=1 LLVM_IAS=1
> > > ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> > > CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- HOSTCC=clang CC=clang
>
> Thanks for the report. Thanks Nathan for submitting reverts.
>
> Naresh, as a heads up, the above command line can be simplified a
> little bit (particularly for newer kernel branches)
>
> LLVM_IAS=1 is implied by LLVM=1 as of v5.15-rc1 via
> commit f12b034afeb3 ("scripts/Makefile.clang: default to LLVM_IAS=1").
>
> CROSS_COMPILE is no longer necessary when building with LLVM=1 as of
> v5.15-rc1 via:
> commit 231ad7f409f1 ("Makefile: infer --target from ARCH for CC=clang")
>
> There is no need for CROSS_COMPILE_COMPAT as of v5.16-rc1 via
> commit 3e6f8d1fa184 ("arm64: vdso32: require CROSS_COMPILE_COMPAT for gcc+bfd")
> when LLVM=1 is set.
>
> HOSTCC and CC are implied by LLVM=1 as of
> commit a0d1c951ef08 ("kbuild: support LLVM=1 to switch the default
> tools to Clang/LLVM")
> v5.7-rc1.
>
> So the above make invocation could be trimmed down to simply:
>
> $ make --silent --keep-going --jobs=8 \
> O=/home/tuxbuild/.cache/tuxmake/builds/current LLVM=1
>
> We might need to discuss further with tuxbuild folks, since I think a
> few of those are set implicitly; I would prefer if they needed to be
> set explicitly in order to properly test them being _unspecified_ in
> our CI.

Filed: https://gitlab.com/Linaro/tuxsuite/-/issues/151

-- 
Thanks,
~Nick Desaulniers