arm64: remove no-op -p linker flag
authorGreg Hackmann <ghackmann@android.com>
Wed, 27 Jun 2018 19:46:14 +0000 (12:46 -0700)
committerCatalin Marinas <catalin.marinas@arm.com>
Thu, 5 Jul 2018 18:12:48 +0000 (19:12 +0100)
commit1a381d4a0a9a0f999a13faaba22bf6b3fc80dcb9
tree7bef89bd785323a5b03a202af8739f99897a14ae
parent2893af07e507e993ad71ca6d66a7b02be741571c
arm64: remove no-op -p linker flag

Linking the ARM64 defconfig kernel with LLVM lld fails with the error:

  ld.lld: error: unknown argument: -p
  Makefile:1015: recipe for target 'vmlinux' failed

Without this flag, the ARM64 defconfig kernel successfully links with
lld and boots on Dragonboard 410c.

After digging through binutils source and changelogs, it turns out that
-p is only relevant to ancient binutils installations targeting 32-bit
ARM.  binutils accepts -p for AArch64 too, but it's always been
undocumented and silently ignored.  A comment in
ld/emultempl/aarch64elf.em explains that it's "Only here for backwards
compatibility".

Since this flag is a no-op on ARM64, we can safely drop it.

Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/Makefile