[RFC] Kbuild: allow code re-use across different directories

[amwang@redhat.com (Cong Wang)]

? 2011?08?20? 08:37, Arnaud Lacombe ??:
> Hi folks,
>
> The attached patch modify Kbuild to allow to directly re-use code in multiple
> directory without having to go through a copy. Technically, it changes Kbuild to
> use by default the VPATH feature of GNU make and provides accessors for Makefile
> to change it indirectly.
...
>
> With the attached patch, we would do:
>
> arch/foo/boot/Makefile:
> LDFLAGS_fancy.o := -DPANTS=30
> obj-y += fancy.o
> vpath-y += $(srctree)/arch/foo/lib
>
> and let GNU make do the job.

Just note that don't forget to update Documentation/kbuild/makefiles.txt. ;)

Thanks.