Unverified Commit 6a7ee50f authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

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: default avatarArnd Bergmann <arnd@arndb.de>
Reviewed-by: default avatarNathan 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: default avatarArnd Bergmann <arnd@arndb.de>
parent 4b886159

arch/arm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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 || \