* [PATCH] ARM: disallow pre-ARMv5 builds with ld.lld
@ 2022-12-15 16:26 Arnd Bergmann
2022-12-16 23:10 ` Nathan Chancellor
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2022-12-15 16:26 UTC (permalink / raw)
To: Russell King, Nathan Chancellor, Nick Desaulniers
Cc: soc, Arnd Bergmann, Tom Rix, Linus Walleij, Russell King (Oracle),
Ard Biesheuvel, Geert Uytterhoeven, linux-arm-kernel,
linux-kernel, llvm
From: Arnd Bergmann <arnd@arndb.de>
lld cannot build for ARMv4/v4T targets because it inserts 'blx' instructions
that are unsupported there:
ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
Add a Kconfig time dependency to prevent those targets from being
selected in randconfig builds.
Link: https://github.com/llvm/llvm-project/issues/50764
Link: https://github.com/ClangBuiltLinux/linux/issues/964
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/arm/Kconfig | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4a8fff7f9be0..d995054ab602 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -344,12 +344,14 @@ comment "CPU Core family selection"
config ARCH_MULTI_V4
bool "ARMv4 based platforms (FA526, StrongARM)"
depends on !ARCH_MULTI_V6_V7
+ depends on !LD_IS_LLD
select ARCH_MULTI_V4_V5
select CPU_FA526 if !(CPU_SA110 || CPU_SA1100)
config ARCH_MULTI_V4T
bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
depends on !ARCH_MULTI_V6_V7
+ depends on !LD_IS_LLD
select ARCH_MULTI_V4_V5
select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
--
2.35.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: disallow pre-ARMv5 builds with ld.lld
2022-12-15 16:26 [PATCH] ARM: disallow pre-ARMv5 builds with ld.lld Arnd Bergmann
@ 2022-12-16 23:10 ` Nathan Chancellor
0 siblings, 0 replies; 2+ messages in thread
From: Nathan Chancellor @ 2022-12-16 23:10 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Russell King, Nick Desaulniers, soc, Arnd Bergmann, Tom Rix,
Linus Walleij, Russell King (Oracle), Ard Biesheuvel,
Geert Uytterhoeven, linux-arm-kernel, linux-kernel, llvm
On Thu, Dec 15, 2022 at 05:26:20PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> lld cannot build for ARMv4/v4T targets because it inserts 'blx' instructions
> that are unsupported there:
>
> ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected
>
> Add a Kconfig time dependency to prevent those targets from being
> selected in randconfig builds.
>
> Link: https://github.com/llvm/llvm-project/issues/50764
> Link: https://github.com/ClangBuiltLinux/linux/issues/964
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> ---
> arch/arm/Kconfig | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 4a8fff7f9be0..d995054ab602 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -344,12 +344,14 @@ comment "CPU Core family selection"
> config ARCH_MULTI_V4
> bool "ARMv4 based platforms (FA526, StrongARM)"
> depends on !ARCH_MULTI_V6_V7
> + depends on !LD_IS_LLD
> select ARCH_MULTI_V4_V5
> select CPU_FA526 if !(CPU_SA110 || CPU_SA1100)
>
> config ARCH_MULTI_V4T
> bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
> depends on !ARCH_MULTI_V6_V7
> + depends on !LD_IS_LLD
> select ARCH_MULTI_V4_V5
> select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
> CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
> --
> 2.35.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-12-16 23:10 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-12-15 16:26 [PATCH] ARM: disallow pre-ARMv5 builds with ld.lld Arnd Bergmann
2022-12-16 23:10 ` Nathan Chancellor
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox