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Nick Desaulniers231ad7f2021-08-02 11:39:09 -07001# 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.
4CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi
5CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu
6CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl
7CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu
8CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu
9CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu
10CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu
11CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu
12CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu
Kees Cookc7500c12022-02-16 16:24:02 -080013CLANG_TARGET_FLAGS_um := $(CLANG_TARGET_FLAGS_$(SUBARCH))
Nick Desaulniers231ad7f2021-08-02 11:39:09 -070014CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(SRCARCH))
15
16ifeq ($(CROSS_COMPILE),)
17ifeq ($(CLANG_TARGET_FLAGS),)
18$(error Specify CROSS_COMPILE or add '--target=' option to scripts/Makefile.clang)
19else
20CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)
21endif # CLANG_TARGET_FLAGS
22else
Nick Desaulniers6f5b41a2021-08-02 11:39:08 -070023CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
Nick Desaulniers231ad7f2021-08-02 11:39:09 -070024endif # CROSS_COMPILE
25
Nick Desaulniersf12b0342021-08-06 10:27:01 -070026ifeq ($(LLVM_IAS),0)
Nathan Chancellor2185a7e2021-08-16 13:52:47 -070027CLANG_FLAGS += -fno-integrated-as
Nick Desaulniers6f5b41a2021-08-02 11:39:08 -070028GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
29CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
Nick Desaulniersf12b0342021-08-06 10:27:01 -070030else
Nathan Chancellor2185a7e2021-08-16 13:52:47 -070031CLANG_FLAGS += -fintegrated-as
Nick Desaulniers6f5b41a2021-08-02 11:39:08 -070032endif
Nathan Chancellor06646842021-09-16 11:40:17 -070033# By default, clang only warns when it encounters an unknown warning flag or
34# certain optimization flags it knows it has not implemented.
35# Make it behave more like gcc by erroring when these flags are encountered
36# so they can be implemented or wrapped in cc-option.
Nick Desaulniers6f5b41a2021-08-02 11:39:08 -070037CLANG_FLAGS += -Werror=unknown-warning-option
Nathan Chancellor06646842021-09-16 11:40:17 -070038CLANG_FLAGS += -Werror=ignored-optimization-argument
Nathan Chancellordb1547c2023-01-11 20:05:10 -070039CLANG_FLAGS += -Werror=option-ignored
40CLANG_FLAGS += -Werror=unused-command-line-argument
Nick Desaulniers6f5b41a2021-08-02 11:39:08 -070041KBUILD_CFLAGS += $(CLANG_FLAGS)
42KBUILD_AFLAGS += $(CLANG_FLAGS)
43export CLANG_FLAGS