linux-kernel - Re: [PATCH v2 01/10] kbuild: don't enable CC_CAN_LINK if the dummy program generates warnings

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Message-ID: <aRTmSzzOmdhBy_lO@derry.ads.avm.de>
Date: Wed, 12 Nov 2025 20:55:55 +0100
From: Nicolas Schier <nsc@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Nathan Chancellor <nathan@...nel.org>, Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-mips@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 01/10] kbuild: don't enable CC_CAN_LINK if the dummy
 program generates warnings

On Tue, Oct 14, 2025 at 03:05:16PM +0200, Thomas Weißschuh wrote:
> It is possible that the kernel toolchain generates warnings when used
> together with the system toolchain. This happens for example when the
> older kernel toolchain does not handle new versions of sframe debug
> information. While these warnings where ignored during the evaluation
> of CC_CAN_LINK, together with CONFIG_WERROR the actual userprog build
> will later fail.
> 
> Example warning:
> 
> .../x86_64-linux/13.2.0/../../../../x86_64-linux/bin/ld:
> error in /lib/../lib64/crt1.o(.sframe); no .sframe will be created
> collect2: error: ld returned 1 exit status
> 
> Make sure that the very simple example program does not generate
> warnings already to avoid breaking the userprog compilations.
> 
> Fixes: ec4a3992bc0b ("kbuild: respect CONFIG_WERROR for linker and assembler")
> Fixes: 3f0ff4cc6ffb ("kbuild: respect CONFIG_WERROR for userprogs")
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
> ---
>  scripts/cc-can-link.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Nicolas Schier <nsc@...nel.org>

-- 
Nicolas