How to build kernel module spread on subdirectories?

[Nikola Knežević]

On 30 Nov 2008, at 18:43 , Mel wrote:
>> since there were no replies, I went into the various .mk's, and I
>> found some inconsistencies when building modules. If you have a file
>> in a different directory, below the directory where you BSDmakefile
>> is, objects won't be linked nor cleaned properly.
>
> The base of the FreeBSD build system, is that SRCS contains file  
> names. Not
> pathnames. Use .PATH directive if sources are elsewhere. This is the  
> only

Hi Mel,
thanks for the clarification. I didn't know that SRCS has to contain  
only filenames.

> thing you cannot easily change and should not globally change. A  
> simple
> example of this is sbin/fsdb/Makefile which uses sources from sbin/ 
> fsck_ffs.
>
> If you really need it, you should override compilation rules in your  
> own
> BSDmakefile, like so:
> .c.o:
>        ${CC} ${CFLAGS} -c ${.IMPSRC} -o ${.TARGET}
>
> .cpp.o:
>        ${CXX} ${CXXFLAGS} -c ${.IMPSRC} -o ${.TARGET}
>

So, I'm now using only filenames in SRCS and the .PATH target.

As I described in my initial mail, I have to use two makefiles. One is  
the main Makefile, while the other has to be generated. In the  
generated .mk, I add to the SRCS, and I create the .PATH target with  
other (necessary) directories. Unfortunately, make depend doesn't work  
as it should be. This is the important snippet of my BSDmakefile:
---8<---
elements.mk: elements.conf
	$(CLICKDIR)/click-buildtool elem2make --bsd elements.conf > elements.mk

.MAKEFILEDEPS: elements.mk

.sinclude "elements.mk"
.include <bsd.kmod.mk>
--->8---

When I run make depend, it only includes SRCSs from BSDmakefile, not  
those from elements.mk. Is there a way to overcome this? I can  
manually run make elements.mk, but it is a bit tedious.

Cheers,
Nikola