On 27/04/2024 16:55, Masahiro Yamada wrote: > Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for > checked-in source files. It is merely a convention without any functional > difference. In fact, $(obj) and $(src) are exactly the same, as defined > in scripts/Makefile.build: > > src := $(obj) > > When the kernel is built in a separate output directory, $(src) does > not accurately reflect the source directory location. While Kbuild > resolves this discrepancy by specifying VPATH=$(srctree) to search for > source files, it does not cover all cases. For example, when adding a > header search path for local headers, -I$(srctree)/$(src) is typically > passed to the compiler. > > This introduces inconsistency between upstream and downstream Makefiles > because $(src) is used instead of $(srctree)/$(src) for the latter. > > To address this inconsistency, this commit changes the semantics of > $(src) so that it always points to the directory in the source tree. > > Going forward, the variables used in Makefiles will have the following > meanings: > > $(obj) - directory in the object tree > $(src) - directory in the source tree (changed by this commit) > $(objtree) - the top of the kernel object tree > $(srctree) - the top of the kernel source tree > > Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced > with $(src). > This patch, since yesterday's next, causes build issues with my (completely) standard and typical workflow: alias crosc64='CROSS_COMPILE="ccache aarch64-linux-gnu-" ARCH=arm64 KBUILD_OUTPUT=out/' crosc64 make defconfig crosc64 make dt_binding_check Errors: No rule to make target 'Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.example.dtb', needed by 'dt_binding_check'. Stop. Please revert/drop from next. Best regards, Krzysztof
