Re: kbuild: shorthand ym2y, ym2m etc

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Sun, Jan 30, 2005 at 11:39:26PM +0100, Sam Ravnborg wrote:
> On Sun, Jan 30, 2005 at 07:52:30PM +0000, Christoph Hellwig wrote:
> > 
> > obj-$(CONFIG_FB)$(CONFIG_PPC)		+= macmodes.o
> > 
> > would be a lot more obvious, but I'm not sure how to handle
> > it for the case where one of them evaluates to m
> 
> The real problem is when say CONFIG_FB are empty. Then kbuild will see:
> obj-$(CONFIG_PPC) which I doubt was what you wanted.
> 
> This can be fixed by changing Kconfig to evaluate all known symbols to
> either y,m,n - in contradiction to today where symbols that evaluate
> to n is left empty.

Isn't that rather hard to achieve, unless all Kconfig files (including
all architecture specific ones) are read?  Eg, CONFIG_PPC wouldn't
exist on ARM.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core