Commit 9d90161c authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: Force ELFv2 when building with LLVM linker 



The LLVM linker does not support ELFv1 at all, so BE kernels must be
built with ELFv2. The LLD version check was added to be conservative,
LLD simply fails to link ELFv1 entirely, effectively requiring LLD >= 15
and ELFv2 for BE builds. Instead remove that restriction until proven
otherwise (LLD 14.0 links a booting ELFv2 BE vmlinux for me).

The minimum GNU binutils has increased such that ELFv2 is always
supported, so remove that check while we're here.

Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
Tested-by: default avatarNathan Chancellor <nathan@kernel.org>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230606093832.199712-2-npiggin@gmail.com
parent f5df87b8

arch/powerpc/Kconfig

+2 −4
Original line number Diff line number Diff line
@@ -624,10 +624,10 @@ config ARCH_HAS_KEXEC_PURGATORY 
	def_bool KEXEC_FILE



config PPC64_BIG_ENDIAN_ELF_ABI_V2

	bool "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)"

	prompt "Build big-endian kernel using ELF ABI V2 (EXPERIMENTAL)" if LD_IS_BFD

	def_bool y if LD_IS_LLD

	depends on PPC64 && CPU_BIG_ENDIAN

	depends on CC_HAS_ELFV2

	depends on LD_VERSION >= 22400 || LLD_VERSION >= 150000

	help

	  This builds the kernel image using the "Power Architecture 64-Bit ELF

	  V2 ABI Specification", which has a reduced stack overhead and faster
@@ -638,8 +638,6 @@ config PPC64_BIG_ENDIAN_ELF_ABI_V2 
	  it is less well tested by kernel and toolchain. However some distros

	  build userspace this way, and it can produce a functioning kernel.



	  This requires GCC and binutils 2.24 or newer.



config RELOCATABLE

	bool "Build a relocatable kernel"

	depends on PPC64 || (FLATMEM && (44x || PPC_85xx))