linux-kernel - Kbuild problem (was: [2.6 patch] drivers/isdn/gigaset/: build asyncdata.o into the gigaset module)

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Date:	Sat, 17 Feb 2007 01:04:33 +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: Kbuild problem (was: [2.6 patch] drivers/isdn/gigaset/: build asyncdata.o
 into the gigaset module)

Am 16.02.2007 09:33 schrieb Adrian Bunk:
>>> ...
>>>   LD      drivers/isdn/gigaset/built-in.o
>>> drivers/isdn/gigaset/ser_gigaset.o: In function `gigaset_m10x_send_skb':
>>> (.text+0xe50): multiple definition of `gigaset_m10x_send_skb'
>>> drivers/isdn/gigaset/usb_gigaset.o:(.text+0x0): first defined here
>>> drivers/isdn/gigaset/ser_gigaset.o: In function `gigaset_m10x_input':
>>> (.text+0x1121): multiple definition of `gigaset_m10x_input'
>>> drivers/isdn/gigaset/usb_gigaset.o:(.text+0x2d1): first defined here
>>> make[4]: *** [drivers/isdn/gigaset/built-in.o] Error 1

> CONFIG_ISDN_DRV_GIGASET=y
> CONFIG_GIGASET_BASE=y
> CONFIG_GIGASET_M105=y
> CONFIG_GIGASET_M101=y

Ah, thanks, I can see what's happening now. When both the M101 and M105
drivers are built into the kernel, asyncdata.o gets linked in twice, via

	usb_gigaset-y := usb-gigaset.o asyncdata.o
	obj-$(CONFIG_GIGASET_M105) += usb_gigaset.o gigaset.o

and

	ser_gigaset-y := ser-gigaset.o asyncdata.o
	obj-$(CONFIG_GIGASET_M101) += ser_gigaset.o gigaset.o

The assertion in Documentation/kbuild/makefiles.txt:

        The order of files in $(obj-y) is significant.  Duplicates in
        the lists are allowed: the first instance will be linked into
        built-in.o and succeeding instances will be ignored.

doesn't work out in this case because asyncdata.o isn't added directly
to $(obj-y), but as part of usb_gigaset.o and ser_gigaset.o.

I'm not quite happy with your solution, though. 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?

Thanks,
Tilman

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