2003-08-08 14:58:09

by Adrian Bunk

[permalink] [raw]
Subject: 2.6: kconfig handling of recursive dependencies could be improved

Hi Roman,

I tried to implement a "select at least one of these options" using the
following Kconfig snippet:

config A
bool "a"

config B
bool "b"

config C
bool
default y if A=n && B=n
select A
select B

"make *config" says
Warning! Found recursive dependency: A C A
Warning! Found recursive dependency: C A C B

and handles it a bit strange.

Yes, there is a limited recursion, but it's a finite recursion and I
don't know of any other way to express this in the current kconfig
language.

cu
Adrian

--

"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed


2003-08-08 15:30:09

by Roman Zippel

[permalink] [raw]
Subject: Re: 2.6: kconfig handling of recursive dependencies could be improved

Hi,

On Fri, 8 Aug 2003, Adrian Bunk wrote:

> I tried to implement a "select at least one of these options" using the
> following Kconfig snippet:
>
> config A
> bool "a"
>
> config B
> bool "b"
>
> config C
> bool
> default y if A=n && B=n
> select A
> select B

This sort of dependency would be better handled with another choice
option, but this is not really 2.6 material.

> Yes, there is a limited recursion, but it's a finite recursion and I
> don't know of any other way to express this in the current kconfig
> language.

It's not really possible. You can show a comment if nothing is selected
and use a reasonable default.

bye, Roman