2.6: kconfig handling of recursive dependencies could be improved

2.6: kconfig handling of recursive dependencies could be improved

[Adrian Bunk]

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

Re: 2.6: kconfig handling of recursive dependencies could be improved

[Roman Zippel]

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