Commit 685969e0 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: remove cc-option test of -ffreestanding 



Some Makefiles already pass -ffreestanding unconditionally.
For example, arch/arm64/lib/Makefile, arch/x86/purgatory/Makefile.

No problem report so far about hard-coding this option. So, we can
assume all supported compilers know -ffreestanding.

I confirmed GCC 4.8 and Clang manuals document this option.

Get rid of cc-option from -ffreestanding.

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
parent 893ab004

arch/s390/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -27,7 +27,7 @@ KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 
KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY

KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float

KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables

KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding)

KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding

KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)

KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)

KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))

arch/x86/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -36,7 +36,7 @@ REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \ 
		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \

		   -mno-mmx -mno-sse



REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)

REALMODE_CFLAGS += -ffreestanding

REALMODE_CFLAGS += -fno-stack-protector

REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)

REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))

arch/x86/boot/compressed/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ cflags-$(CONFIG_X86_32) := -march=i386 
cflags-$(CONFIG_X86_64) := -mcmodel=small

KBUILD_CFLAGS += $(cflags-y)

KBUILD_CFLAGS += -mno-mmx -mno-sse

KBUILD_CFLAGS += $(call cc-option,-ffreestanding)

KBUILD_CFLAGS += -ffreestanding

KBUILD_CFLAGS += -fno-stack-protector

KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)

KBUILD_CFLAGS += $(call cc-disable-warning, gnu)

drivers/firmware/efi/libstub/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt 
KBUILD_CFLAGS			:= $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \

				   -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \

				   -D__NO_FORTIFY \

				   $(call cc-option,-ffreestanding) \

				   -ffreestanding \

				   -fno-stack-protector \

				   $(call cc-option,-fno-addrsig) \

				   -D__DISABLE_EXPORTS

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