On Wed, 11 Dec 2002 18:20:30 +0100 (MET),
"Maciej W. Rozycki" <email@example.com> 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.