Re: help with clang build for mips

From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: clang-built-linux <llvm@lists.linux.dev>,
	Arnd Bergmann <arnd@kernel.org>
Subject: Re: help with clang build for mips
Date: Fri, 22 Jul 2022 14:29:01 +0100	[thread overview]
Message-ID: <CADVatmNtFYyqk0KwYzB1x6hOPkQ=0gV8mPN1BWp6QWrCs5GaxA@mail.gmail.com> (raw)
In-Reply-To: <YtBMNLXEQ4WVJezu@dev-arch.thelio-3990X>

On Thu, Jul 14, 2022 at 6:02 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> Hi Sudip,
>
> On Thu, Jul 14, 2022 at 05:39:39PM +0100, Sudip Mukherjee wrote:
> > Hi All,
> >
> > I am trying to build the kernel for mips architecture with clang. I
> > see some of the configuration builds properly, but some of the configs
> > fails with the error (fuloong2e_defconfig):
> >

<snip>

>
> Unfortunately, I doubt there is much interest in that work, given MIPS
> as an architecture isn't being developed anymore. Might be an
> interesting hobbyist project though. It is probably best to just test
> configurations that work and make sure that those do not regress. Others
> are more than welcome to weigh in though!

So, I have now disabled those builds with unsupported CPU. But I do
see some others with linux-next and will like to have your feedback on
them please.

mips clang cavium_octeon_defconfig:

clang-15: error: unsupported argument '-mfix-cn63xxp1' to option '-Wa,'
make[1]: *** [scripts/Makefile.build:250: scripts/mod/empty.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:1290: prepare0] Error 2

+++++++++++++++++++++++++++++++++++++

mips clang decstation_64_defconfig:

arch/mips/Makefile:281: *** CONFIG_CPU_DADDI_WORKAROUNDS unsupported
without -msym32.  Stop.

+++++++++++++++++++++++++++++++++++++

mips clang ip28_defconfig:

clang-15: error: unknown argument: '-mr10k-cache-barrier=store'
clang-15: error: unknown argument: '-mr10k-cache-barrier=store'
make[1]: *** [scripts/Makefile.build:118: kernel/bounds.s] Error 1
make: *** [arch/mips/Makefile:407: archprepare] Error 2

+++++++++++++++++++++++++++++++++++++

mips clang loongson2k_defconfig:

error: ABI 'o32' is not supported on CPU 'mips64r2'
make[1]: *** [Kbuild:48: missing-syscalls] Error 1
make: *** [arch/mips/Makefile:409: archprepare] Error 2

+++++++++++++++++++++++++++++++++++++

mips clang loongson3_defconfig:

error: ABI 'o32' is not supported on CPU 'mips64r2'
make[1]: *** [Kbuild:48: missing-syscalls] Error 1
make: *** [arch/mips/Makefile:409: archprepare] Error 2

+++++++++++++++++++++++++++++++++++++

-- 
Regards
Sudip