linux-kernel - Re: [PATCH v2] selftests/nolibc: always build sparc32 tests with -mcpu=v8

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Message-ID: <aVzse_i9tuFOiUO7@1wt.eu>
Date: Tue, 6 Jan 2026 12:05:31 +0100
From: Willy Tarreau <w@....eu>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests/nolibc: always build sparc32 tests with
 -mcpu=v8

On Tue, Jan 06, 2026 at 11:39:55AM +0100, Thomas Weißschuh wrote:
> Since LLVM commit 39e30508a7f6 ("[Driver][Sparc] Default to -mcpu=v9 for
> 32-bit Linux/sparc64 (#109278)"), clang defaults to -mcpu=v9 for 32-bit
> SPARC builds. -mcpu=v9 generates instructions which are not recognized
> by qemu-sparc and qemu-system-sparc.
> 
> Explicitly enforce -mcpu=v8 to generate compatible code.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Changes in v2:
> - Use -mcpu=v8
> - Link to v1: https://patch.msgid.link/20260104-nolibc-sparc32-fix-v1-1-e341b06cbdb7@weissschuh.net
> ---
>  tools/testing/selftests/nolibc/Makefile.nolibc | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/nolibc/Makefile.nolibc b/tools/testing/selftests/nolibc/Makefile.nolibc
> index b17ba2f8fb46..f5704193038f 100644
> --- a/tools/testing/selftests/nolibc/Makefile.nolibc
> +++ b/tools/testing/selftests/nolibc/Makefile.nolibc
> @@ -226,7 +226,7 @@ CFLAGS_mipsn32be = -EB -mabi=n32 -march=mips64r6
>  CFLAGS_mips64le = -EL -mabi=64 -march=mips64r6
>  CFLAGS_mips64be = -EB -mabi=64 -march=mips64r2
>  CFLAGS_loongarch = $(if $(LLVM),-fuse-ld=lld)
> -CFLAGS_sparc32 = $(call cc-option,-m32)
> +CFLAGS_sparc32 = $(call cc-option,-m32) -mcpu=v8
>  CFLAGS_sh4 = -ml -m4
>  ifeq ($(origin XARCH),command line)
>  CFLAGS_XARCH = $(CFLAGS_$(XARCH))

Thank you Thomas!

Acked-by: Willy Tarreau <w@....eu>

willy