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efi/libstub: arm: support building with clang

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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 c1c386681b ("ARM:
8767/1: add support for building ARM kernel with clang").

Signed-off-by: Alistair Strachan <[email protected]>
Reviewed-by: Stefan Agner <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
This commit is contained in:
Alistair Strachan 2018-08-09 09:40:42 -07:00 • committed by Ard Biesheuvel
commit 41f1c48420
1 changed files with 2 additions and 1 deletions
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3
drivers/firmware/efi/libstub/Makefile
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@ -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