linux-kernel - Re: Kbuild problem

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Date:	Sat, 17 Feb 2007 19:36:54 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Adrian Bunk <bunk@...sta.de>
CC:	Hansjoerg Lipp <hjlipp@....de>,
	gigaset307x-common@...ts.sourceforge.net, kkeil@...e.de,
	kai.germaschewski@....de, isdn4linux@...tserv.isdn4linux.de,
	linux-kernel@...r.kernel.org
Subject: Re: Kbuild problem

Am 17.02.2007 11:52 schrieb Adrian Bunk:
> On Sat, Feb 17, 2007 at 01:04:33AM +0100, Tilman Schmidt wrote:
>> [...] I'd prefer a
>> Makefile which builds modular usb_gigaset.ko and/or ser_gigaset.ko
>> like the present one (including asyncdata.o), but when linking
>> usb-gigaset.o and ser-gigaset.o into the kernel includes asyncdata.o
>> only once. Trouble is, I don't know how to express that in Kbuild.
>>
>> Any ideas?
> 
> CONFIG_GIGASET_M105=y, CONFIG_GIGASET_M101=m and similar problems might 
> make this quite tricky.

I am no judge of that. All I know about the possibilities of Kbuild
is what the files in Documentation/kbuild tell me. From browsing
through other kernel Makefiles it would appear that there are more
possibilities though, such as if/then/else constructs.

> Shared functionality simply doesn't belong into any of the affected 
> modules, but to a different place where all users can access it.

Alright, then so be it. But that raises another question:
asyncdata.o is only needed for M105 and M101, not for the base
driver. How do I express in Kbuild that asyncdata.o is to be added
to gigaset-y only if CONFIG_GIGASET_M105 and CONFIG_GIGASET_M101
are not both 'n'?

Thanks,
Tilman

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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