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From: Keith Owens <kaos@ocs.com.au>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Jun Sun <jsun@mvista.com>, linux-mips@linux-mips.org
Subject: Re: IDE module problem 
In-reply-to: Your message of "Wed, 11 Dec 2002 18:20:30 BST."
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Date: Thu, 12 Dec 2002 13:56:37 +1100
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On Wed, 11 Dec 2002 18:20:30 +0100 (MET), 
"Maciej W. Rozycki" <macro@ds2.pg.gda.pl> wrote:
>On Wed, 11 Dec 2002, Jun Sun wrote:
>
>> > > This is because arch/mips/lib/Makefile says:
>> > > 
>> > > obj-$(CONFIG_IDE)               += ide-std.o ide-no.o
>> > [...]
>> > > 3) use some smart trick in Makefile so that we include those
>> > > two files only if CONFIG_IDE is 'y' or 'm'.  (How?)
>> > 
>> >  obj-$(CONFIG_IDE_MODULE)
>> 
>> This does not work.  Apparently, CONFIG_IDE_MODULE is not created 
>> for makefile part.
>
> Indeed -- my fault.  Variables such as $(CONFIG_IDE) are four-state and
>for the module case they are simply set to "m".  But then you can use
>"ifeq ($(CONFIG_IDE),m)".  Another approach is to invent an additional
>variable automatically set to "y" whenever CONFIG_IDE is enabled. 

obj-$(subst m,y,$(CONFIG_IDE)) += ide-std.o ide-no.o

ide-std.o ide-no.o are built in if CONFIG_IDE is m or y.