On Sat, Aug 31, 2019 at 10:04:53PM +0900, Masahiro Yamada wrote: > Kbuild support two file names, "Makefile" and "Kbuild" > for describing obj-y, obj-m, etc.
<snipping the basic explanation, which is documented pretty well, I I think I full understand> > Similarly, arch/$(SRCARCH)/Makefile is very special > in that it is included from the top-level Makefile, > and specify arch-specific compiler flags etc. > > We can use arch/$(SRCARCH)/Kbuild > to specify obj-y, obj-m. > The top-level Makefile does not need to know > the directory structure under arch/$(SRCARCH)/. > > This is logical separation. But only if we document this specific split and eventually stop allowing to build objects from arch/$(SRCARCH)/Makefile. And in my perfect world we'd eventually phase out the magic arch/$(SRCARCH)/Makefile entireŀy. In addition to the normal Kbuild file we'd then have say (names entirely made up and probably not the best idea) arch/$(SRCARCH)/flags.mk to set the various compiler flags and co arch/$(SRCARCH)/targets.mk for extra arch-specific targets
