scripts/Makefile.clang

   1 # Individual arch/{arch}/Makefiles should use -EL/-EB to set intended
   2 # endianness and -m32/-m64 to set word size based on Kconfigs instead of
   3 # relying on the target triple.
   4 CLANG_TARGET_FLAGS_arm          := arm-linux-gnueabi
   5 CLANG_TARGET_FLAGS_arm64        := aarch64-linux-gnu
   6 CLANG_TARGET_FLAGS_hexagon      := hexagon-linux-musl
   7 CLANG_TARGET_FLAGS_m68k         := m68k-linux-gnu
   8 CLANG_TARGET_FLAGS_mips         := mipsel-linux-gnu
   9 CLANG_TARGET_FLAGS_powerpc      := powerpc64le-linux-gnu
  10 CLANG_TARGET_FLAGS_riscv        := riscv64-linux-gnu
  11 CLANG_TARGET_FLAGS_s390         := s390x-linux-gnu
  12 CLANG_TARGET_FLAGS_x86          := x86_64-linux-gnu
  13 CLANG_TARGET_FLAGS              := $(CLANG_TARGET_FLAGS_$(SRCARCH))
  14
  15 ifeq ($(CROSS_COMPILE),)
  16 ifeq ($(CLANG_TARGET_FLAGS),)
  17 $(error Specify CROSS_COMPILE or add '--target=' option to scripts/Makefile.clang)
  18 else
  19 CLANG_FLAGS     += --target=$(CLANG_TARGET_FLAGS)
  20 endif # CLANG_TARGET_FLAGS
  21 else
  22 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
  23 endif # CROSS_COMPILE
  24
  25 ifeq ($(LLVM_IAS),0)
  26 CLANG_FLAGS     += -fno-integrated-as
  27 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
  28 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
  29 else
  30 CLANG_FLAGS     += -fintegrated-as
  31 endif
  32 # By default, clang only warns when it encounters an unknown warning flag or
  33 # certain optimization flags it knows it has not implemented.
  34 # Make it behave more like gcc by erroring when these flags are encountered
  35 # so they can be implemented or wrapped in cc-option.
  36 CLANG_FLAGS     += -Werror=unknown-warning-option
  37 CLANG_FLAGS     += -Werror=ignored-optimization-argument
  38 KBUILD_CFLAGS   += $(CLANG_FLAGS)
  39 KBUILD_AFLAGS   += $(CLANG_FLAGS)
  40 export CLANG_FLAGS