linux-kernel - Re: [PATCH 2/2] kbuild: userprogs: use lld to link through clang

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Message-ID: <20250215041517.GA2645277@ax162>
Date: Fri, 14 Feb 2025 21:15:17 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Sam Ravnborg <sam@...nborg.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	stable@...r.kernel.org
Subject: Re: [PATCH 2/2] kbuild: userprogs: use lld to link through clang

On Fri, Feb 14, 2025 at 08:40:22AM +0100, Thomas Weißschuh wrote:
> FYI, in case you want to have a look:
> The kunit config for powerpc is currently broken on LLVM=1.
> 
> $ ./tools/testing/kunit/kunit.py run --arch powerpc --make_options LLVM=1
> 
> arch/powerpc/boot/wrapper manually inspects with CROSS_COMPILE, which does not
> exist when LLVM=1. Instead it falls back to the system objcopy, etc.

Thanks for reminding me, it is a known papercut:

https://github.com/ClangBuiltLinux/linux/issues/1601

I have a WIP series but there are still some errors in the
configurations that I test that I have not investigated.

https://git.kernel.org/pub/scm/linux/kernel/git/nathan/linux.git/log/?h=b4/ppc-boot-llvm-1

Cheers,
Nathan