* [PATCH] sparc: Disable compat support with LLD
@ 2026-05-08 0:08 Rosen Penev
2026-05-14 13:00 ` Nathan Chancellor
0 siblings, 1 reply; 2+ messages in thread
From: Rosen Penev @ 2026-05-08 0:08 UTC (permalink / raw)
To: sparclinux
Cc: David S. Miller, Andreas Larsson, Nathan Chancellor,
Nick Desaulniers, Bill Wendling, Justin Stitt, open list,
open list:CLANG/LLVM BUILD SUPPORT:Keyword:b(?i:clang|llvm)b
An LLVM=1 sparc64 allmodconfig enables COMPAT and then tries to
build the 32-bit vDSO. That path cannot be linked with ld.lld:
ld.lld: error: unknown emulation: elf32_sparc
ld.lld does not support the 32-bit SPARC ELF emulation used for
the compat vDSO, so keep COMPAT disabled when LLD is the linker.
This avoids selecting an unsupported build path while leaving the
existing GNU ld configuration unchanged.
Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
arch/sparc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a6b787efc2c4..681ab2fd3d8a 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -474,6 +474,7 @@ endmenu
config COMPAT
bool
depends on SPARC64
+ depends on !LD_IS_LLD
default y
select HAVE_UID16
select ARCH_WANT_OLD_COMPAT_IPC
--
2.54.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] sparc: Disable compat support with LLD
2026-05-08 0:08 [PATCH] sparc: Disable compat support with LLD Rosen Penev
@ 2026-05-14 13:00 ` Nathan Chancellor
0 siblings, 0 replies; 2+ messages in thread
From: Nathan Chancellor @ 2026-05-14 13:00 UTC (permalink / raw)
To: Rosen Penev
Cc: sparclinux, David S. Miller, Andreas Larsson, Nick Desaulniers,
Bill Wendling, Justin Stitt, open list,
open list:CLANG/LLVM BUILD SUPPORT:Keyword:b(?i:clang|llvm)b
On Thu, May 07, 2026 at 05:08:34PM -0700, Rosen Penev wrote:
> An LLVM=1 sparc64 allmodconfig enables COMPAT and then tries to
> build the 32-bit vDSO. That path cannot be linked with ld.lld:
>
> ld.lld: error: unknown emulation: elf32_sparc
>
> ld.lld does not support the 32-bit SPARC ELF emulation used for
> the compat vDSO, so keep COMPAT disabled when LLD is the linker.
> This avoids selecting an unsupported build path while leaving the
> existing GNU ld configuration unchanged.
>
> Assisted-by: Codex:GPT-5.5
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
It does not sound like sparc32 will be supported in ld.lld without
someone contributing the work:
https://github.com/llvm/llvm-project/issues/100320#issuecomment-2254229711
So this seems reasonable, even if we don't support ld.lld for sparc64
in the kernel right now.
Acked-by: Nathan Chancellor <nathan@kernel.org>
> ---
> arch/sparc/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index a6b787efc2c4..681ab2fd3d8a 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -474,6 +474,7 @@ endmenu
> config COMPAT
> bool
> depends on SPARC64
> + depends on !LD_IS_LLD
> default y
> select HAVE_UID16
> select ARCH_WANT_OLD_COMPAT_IPC
> --
> 2.54.0
>
--
Cheers,
Nathan
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2026-05-14 13:00 ` Nathan Chancellor
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