mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
0664684e1e
Similar to commit 589834b3a0 ("kbuild: Add
-Werror=unknown-warning-option to CLANG_FLAGS").
Clang ignores certain GCC flags that it has not implemented, only
emitting a warning:
$ echo | clang -fsyntax-only -falign-jumps -x c -
clang-14: warning: optimization flag '-falign-jumps' is not supported
[-Wignored-optimization-argument]
When one of these flags gets added to KBUILD_CFLAGS unconditionally, all
subsequent cc-{disable-warning,option} calls fail because -Werror was
added to these invocations to turn the above warning and the equivalent
-W flag warning into errors.
To catch the presence of these flags earlier, turn
-Wignored-optimization-argument into an error so that the flags can
either be implemented or ignored via cc-option and there are no more
weird errors.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
41 lines
1.6 KiB
Makefile
41 lines
1.6 KiB
Makefile
# Individual arch/{arch}/Makefiles should use -EL/-EB to set intended
|
|
# endianness and -m32/-m64 to set word size based on Kconfigs instead of
|
|
# relying on the target triple.
|
|
CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi
|
|
CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu
|
|
CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl
|
|
CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu
|
|
CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu
|
|
CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu
|
|
CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu
|
|
CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu
|
|
CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu
|
|
CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(SRCARCH))
|
|
|
|
ifeq ($(CROSS_COMPILE),)
|
|
ifeq ($(CLANG_TARGET_FLAGS),)
|
|
$(error Specify CROSS_COMPILE or add '--target=' option to scripts/Makefile.clang)
|
|
else
|
|
CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)
|
|
endif # CLANG_TARGET_FLAGS
|
|
else
|
|
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
|
|
endif # CROSS_COMPILE
|
|
|
|
ifeq ($(LLVM_IAS),0)
|
|
CLANG_FLAGS += -fno-integrated-as
|
|
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
|
|
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
|
|
else
|
|
CLANG_FLAGS += -fintegrated-as
|
|
endif
|
|
# By default, clang only warns when it encounters an unknown warning flag or
|
|
# certain optimization flags it knows it has not implemented.
|
|
# Make it behave more like gcc by erroring when these flags are encountered
|
|
# so they can be implemented or wrapped in cc-option.
|
|
CLANG_FLAGS += -Werror=unknown-warning-option
|
|
CLANG_FLAGS += -Werror=ignored-optimization-argument
|
|
KBUILD_CFLAGS += $(CLANG_FLAGS)
|
|
KBUILD_AFLAGS += $(CLANG_FLAGS)
|
|
export CLANG_FLAGS
|