Newer versions of clang only look for $(COMPAT_GCC_TOOLCHAIN_DIR)as [1], rather than $(COMPAT_GCC_TOOLCHAIN_DIR)$(CROSS_COMPILE_COMPAT)as, resulting in the following build error: $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \ CROSS_COMPILE_COMPAT=arm-linux-gnueabi- LLVM=1 O=out/aarch64 distclean \ defconfig arch/arm64/kernel/vdso32/ ... /home/nathan/cbl/toolchains/llvm-binutils/bin/as: unrecognized option '-EL' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) make[3]: *** [arch/arm64/kernel/vdso32/Makefile:181: arch/arm64/kernel/vdso32/note.o] Error 1 ... Adding the value of CROSS_COMPILE_COMPAT (adding notdir to account for a full path for CROSS_COMPILE_COMPAT) fixes this issue, which matches the solution done for the main Makefile [2]. [1]: https://github.com/llvm/llvm-project/commit/3452a0d8c17f7166f479706b293caf6ac76ffd90 [2]: https://lore.kernel.org/lkml/20200721173125.1273884-1-maskray@xxxxxxxxxx/ Cc: stable@xxxxxxxxxxxxxxx Link: https://github.com/ClangBuiltLinux/linux/issues/1099 Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx> --- arch/arm64/kernel/vdso32/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile index d88148bef6b0..5139a5f19256 100644 --- a/arch/arm64/kernel/vdso32/Makefile +++ b/arch/arm64/kernel/vdso32/Makefile @@ -14,7 +14,7 @@ COMPAT_GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE_COMPAT)elfedit)) COMPAT_GCC_TOOLCHAIN := $(realpath $(COMPAT_GCC_TOOLCHAIN_DIR)/..) CC_COMPAT_CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%)) -CC_COMPAT_CLANG_FLAGS += --prefix=$(COMPAT_GCC_TOOLCHAIN_DIR) +CC_COMPAT_CLANG_FLAGS += --prefix=$(COMPAT_GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE_COMPAT)) CC_COMPAT_CLANG_FLAGS += -no-integrated-as -Qunused-arguments ifneq ($(COMPAT_GCC_TOOLCHAIN),) CC_COMPAT_CLANG_FLAGS += --gcc-toolchain=$(COMPAT_GCC_TOOLCHAIN) base-commit: d15be546031cf65a0fc34879beca02fd90fe7ac7 -- 2.28.0.rc1
