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Commit 41f1c484 authored by Alistair Strachan's avatar Alistair Strachan Committed by Ard Biesheuvel
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efi/libstub: arm: support building with clang 



When building with CONFIG_EFI and CONFIG_EFI_STUB on ARM, the libstub
Makefile would use -mno-single-pic-base without checking it was
supported by the compiler. As the ARM (32-bit) clang backend does not
support this flag, the build would fail.

This changes the Makefile to check the compiler's support for
-mno-single-pic-base before using it, similar to c1c38668 ("ARM:
8767/1: add support for building ARM kernel with clang").

Signed-off-by: default avatarAlistair Strachan <astrachan@google.com>
Reviewed-by: default avatarStefan Agner <stefan@agner.ch>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
parent a23d3bb0

drivers/firmware/efi/libstub/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -16,7 +16,8 @@ cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \ 
cflags-$(CONFIG_ARM64)		:= $(subst -pg,,$(KBUILD_CFLAGS)) -fpie \

				   $(DISABLE_STACKLEAK_PLUGIN)

cflags-$(CONFIG_ARM)		:= $(subst -pg,,$(KBUILD_CFLAGS)) \

				   -fno-builtin -fpic -mno-single-pic-base

				   -fno-builtin -fpic \

				   $(call cc-option,-mno-single-pic-base)



cflags-$(CONFIG_EFI_ARMSTUB)	+= -I$(srctree)/scripts/dtc/libfdt