From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Nathan Chancellor <nathan@kernel.org>
Cc:     npiggin@gmail.com, christophe.leroy@csgroup.eu,
        erhard_f@mailbox.org, nathan@kernel.org, ndesaulniers@google.com,
        trix@redhat.com, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
        patches@lists.linux.dev
Subject: Re: [PATCH 0/3] Allow CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2 with
 ld.lld 15+
In-Reply-To: <20230118-ppc64-elfv2-llvm-v1-0-b9e2ec9da11d@kernel.org>
References: <20230118-ppc64-elfv2-llvm-v1-0-b9e2ec9da11d@kernel.org>
Date:   Mon, 20 Feb 2023 17:11:54 +1100
Message-ID: <87wn4cyifp.fsf@mpe.ellerman.id.au>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Nathan Chancellor <nathan@kernel.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