Messages in this thread Patch in this message | | | Date | Thu, 1 Jul 2021 16:55:05 -0700 | Subject | [PATCH] arm64: drop CROSS_COMPILE for LLVM=1 LLVM_IAS=1 | From | Nick Desaulniers <> |
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We get constant feedback that the command line invocation of make is too long. CROSS_COMPILE is helpful when a toolchain has a prefix of the target triple, or is an absolute path outside of $PATH, but it's mostly redundant for a given ARCH.
If CROSS_COMPILE is not set, simply set --target=aarch64-linux for CLANG_FLAGS, KBUILD_CFLAGS, and KBUILD_AFLAGS.
Previously, we'd cross compile via: $ ARCH=arm64 CROSS_COMPILE=aarch64-linxu-gnu make LLVM=1 LLVM_IAS=1 Now: $ ARCH=arm64 make LLVM=1 LLVM_IAS=1
We can drop gnu from the triple, but dropping linux from the triple produces different .config files for the above invocations for the defconfig target.
Link: https://github.com/ClangBuiltLinux/linux/issues/1399 Suggested-by: Arnd Bergmann <arnd@kernel.org> Suggested-by: Fangrui Song <maskray@google.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> --- arch/arm64/Makefile | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 7bc37d0a1b68..016873fddcc3 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -34,6 +34,17 @@ $(warning LSE atomics not supported by binutils) endif endif +ifneq ($(LLVM),) +ifneq ($(LLVM_IAS),) +ifeq ($(CROSS_COMPILE),) +CLANG_TARGET :=--target=aarch64-linux +CLANG_FLAGS += $(CLANG_TARGET) +KBUILD_CFLAGS += $(CLANG_TARGET) +KBUILD_AFLAGS += $(CLANG_TARGET) +endif +endif +endif + cc_has_k_constraint := $(call try-run,echo \ 'int main(void) { \ asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ -- 2.32.0.93.g670b81a890-goog
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