linux-kernel - Re: [PATCH] kconfig: warn about complex selects

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Message-ID: <20080504114225.GA19074@uranus.ravnborg.org>
Date:	Sun, 4 May 2008 13:42:25 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Roman Zippel <zippel@...ux-m68k.org>,
	Adrian Bunk <bunk@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: warn about complex selects

On Sun, May 04, 2008 at 01:00:38PM +0200, Vegard Nossum wrote:
> Okay, here's try #2. (That's what I get for making patches too early in the
> morning.)
> 
> This checks dependencies instead of the "default" property. I don't know how
> useful this is, though, as it will generate some false positives. Actually,
> a lot of them.

Consider following simple Kconfig:
config A
        bool "a"

config B
        bool "b"
        depends on A

config C
        bool "c"
        select B

config D
        bool "d"
        depends on A
        select B

We should try to coe up with something that warns on
on the select in "config C", because B has dependencies C
does not have.
The select in D is OK since D has at least the same dependencies
as B.

So if we had a expr_is_subset_of(expr *e1, expr *e2)....

Roman - what do you think?

	Sam

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