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ARM: disallow pre-ARMv5 builds with ld.lld 

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.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://github.com/llvm/llvm-project/issues/50764
Link: https://github.com/ClangBuiltLinux/linux/issues/964
Link: https://lore.kernel.org/r/20221215162635.3750763-1-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2022-12-15 17:26:20 +01:00
parent 4b88615950
commit 6a7ee50f8f
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arch/arm/Kconfig
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@ -342,12 +342,14 @@ 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 || \