Re: Kbuild trick

[Sam Ravnborg <sam@ravnborg.org>]

On Sat, May 21, 2005 at 04:29:35PM +0530, Kedar Sovani wrote:
> One of the question that I haven't yet managed to solve properly is
> how do we manage kernel modules which have its C files in multiple
> underlying directories.
> 
> say :
> /src/Makefile
> /src/main.c
> /src/module1/Makefile
> /src/module1/module1.c
> /src/module1/module_stuff.c
> 
> And the 3 C files should be built into a single module at the top level.
> I tried something like this in the top level Makefile, but it does not work.
> 
> obj-m += mymodule.o
> main-objs=main.o module1/

This create a number of modules - sometimes a good way to do it.
We have several examples in the kernel using this method.

> 
> I could use,
> main-objs=main.o module1/module1.o module1/module_stuff.o
> 
> But I don't think that is a good idea. I looked at
> Documentation/kbuild/, but no luck.
This is one way to do it.
The other way as used by the kernel is to avoid spreading the .c
files in multiple directories.

	Sam