Masahiro, I was looking into sprucing up Kbuild for improved LLD support. One thing I was curious about was the different checks for clang in the top level Makefile. How come a change like: diff --git a/Makefile b/Makefile index 3142e67d03f1..525b3fef7d27 100644 --- a/Makefile +++ b/Makefile @@ -489,7 +489,7 @@ ifneq ($(KBUILD_SRC),) $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) endif -ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) +ifdef CONFIG_CC_IS_CLANG ifneq ($(CROSS_COMPILE),) CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) doesn't work? It's odd that later on in the top level Makefile, we have that kind of check. I was hoping to do something similar for LLD, but it seems that the config options are not defined for that particular make target? Does this have to do with config-targets? -- Thanks, ~Nick Desaulniers
