linux-kernel - Re: [PATCH 0/3] Allow CONFIG_PPC64_BIG_ENDIAN_ELF_ABI

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Message-ID: <87wn4cyifp.fsf@mpe.ellerman.id.au>
Date:   Mon, 20 Feb 2023 17:11:54 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     npiggin@...il.com, christophe.leroy@...roup.eu,
        erhard_f@...lbox.org, nathan@...nel.org, ndesaulniers@...gle.com,
        trix@...hat.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        patches@...ts.linux.dev
Subject: Re: [PATCH 0/3] Allow CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2 with
 ld.lld 15+

Nathan Chancellor <nathan@...nel.org> writes:
> Currently, CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2 is not selectable with
> ld.lld because of an explicit dependency on GNU ld, due to lack of
> testing with LLVM.
>
> Erhard was kind enough to test this option on his hardware with LLVM 15,
> which ran without any issues. This should not be too surprising, as
> ld.lld does not have support for the ELFv1 ABI, only ELFv2, so it should
> have decent support. With this series, big endian kernels can be built
> with LLVM=1.
>
> This has seen our basic set of powerpc configurations with clang-15,
> clang-16, and clang-17 but I will never be opposed to more testing :)
>
> The first two patches fix a couple of issues I noticed while build
> testing and the final patch actually allows the option to be selected.

Thanks for this.

I thought about applying this last week but decided not to. I'll plan to
pick it up for 6.4.

cheers