Hi Masahiro On Tue, Aug 06, 2019 at 03:39:18PM +0900, Masahiro Yamada wrote: > > Recently, Jani Nikula requests a better build system support > for drivers spanning multiple directories. > (better kbuild support for drivers spanning multiple directories?) > > I implemented it, so please take a look at it. > > Note: > The single targets do not work correctly. > > The single targets have never worked correctly: It works in most cases, but now always. I dunno how much it is used. Myself I almost always do make /drivers/foo/bar/ > > [1] For instance, "make drivers/foo/bar/baz.o" will descend into > drivers/foo/bar/Makefile, which may not necessarily specify > the build rule of baz.o > > It is possible for drivers/foo/Makefile having > obj-$(CONFIG_BAZ) += bar/baz.o > > [2] subdir-ccflags-y does not work. > > The single targets directly descend into the directory of > that file resides. > > It missed subdir-ccflags-y if it is specifies in parent > Makefiles. > > Perhaps, I will have to manage correct implementation of single targets. The day that kbuild has a separate step to read all Makefiles and then without using recursive make can build the kernel we can have this fixed. Until then we can accpet it as is - as fixing this may not be simple. Sam
