Date: Sun, 30 Jan 2005 22:44:52 +0000
From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Christoph Hellwig <hch@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: kbuild: shorthand ym2y, ym2m etc
Message-ID: <20050130224452.G25000@flint.arm.linux.org.uk>
Mail-Followup-To: Christoph Hellwig <hch@infradead.org>,
	linux-kernel@vger.kernel.org
References: <20050130193733.GA8984@mars.ravnborg.org> <20050130195230.GA871@infradead.org> <20050130223926.GG14816@mars.ravnborg.org>
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In-Reply-To: <20050130223926.GG14816@mars.ravnborg.org>; from sam@ravnborg.org on Sun, Jan 30, 2005 at 11:39:26PM +0100
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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
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