the-tree/scripts/Makefile.clang

0001 # Individual arch/{arch}/Makefiles should use -EL/-EB to set intended
0002 # endianness and -m32/-m64 to set word size based on Kconfigs instead of
0003 # relying on the target triple.
0004 CLANG_TARGET_FLAGS_arm          := arm-linux-gnueabi
0005 CLANG_TARGET_FLAGS_arm64        := aarch64-linux-gnu
0006 CLANG_TARGET_FLAGS_hexagon      := hexagon-linux-musl
0007 CLANG_TARGET_FLAGS_m68k         := m68k-linux-gnu
0008 CLANG_TARGET_FLAGS_mips         := mipsel-linux-gnu
0009 CLANG_TARGET_FLAGS_powerpc      := powerpc64le-linux-gnu
0010 CLANG_TARGET_FLAGS_riscv        := riscv64-linux-gnu
0011 CLANG_TARGET_FLAGS_s390         := s390x-linux-gnu
0012 CLANG_TARGET_FLAGS_x86          := x86_64-linux-gnu
0013 CLANG_TARGET_FLAGS_um           := $(CLANG_TARGET_FLAGS_$(SUBARCH))
0014 CLANG_TARGET_FLAGS              := $(CLANG_TARGET_FLAGS_$(SRCARCH))
0015
0016 ifeq ($(CROSS_COMPILE),)
0017 ifeq ($(CLANG_TARGET_FLAGS),)
0018 $(error Specify CROSS_COMPILE or add '--target=' option to scripts/Makefile.clang)
0019 else
0020 CLANG_FLAGS     += --target=$(CLANG_TARGET_FLAGS)
0021 endif # CLANG_TARGET_FLAGS
0022 else
0023 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
0024 endif # CROSS_COMPILE
0025
0026 ifeq ($(LLVM_IAS),0)
0027 CLANG_FLAGS     += -fno-integrated-as
0028 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
0029 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
0030 else
0031 CLANG_FLAGS     += -fintegrated-as
0032 endif
0033 # By default, clang only warns when it encounters an unknown warning flag or
0034 # certain optimization flags it knows it has not implemented.
0035 # Make it behave more like gcc by erroring when these flags are encountered
0036 # so they can be implemented or wrapped in cc-option.
0037 CLANG_FLAGS     += -Werror=unknown-warning-option
0038 CLANG_FLAGS     += -Werror=ignored-optimization-argument
0039 KBUILD_CFLAGS   += $(CLANG_FLAGS)
0040 KBUILD_AFLAGS   += $(CLANG_FLAGS)
0041 export CLANG_FLAGS