linux-kernel - Re: kbuild question

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Date:	Fri, 16 Feb 2007 09:50:01 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Kumar Gala <galak@...nel.crashing.org>,
	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: kbuild question

> 
> Now is there some way to not have to duplicate the 'config choices  
> between if ONLY_HAVE_ONE and if !ONLY_HAVE_ONE
> 
> To use your example I want to do:
> 
> config ONLY_HAVE_ONE
> 	prompt "only have one?"
> 	boolean
> 
> if ONLY_HAVE_ONE
> config VAL_FIRST
> 	bool "First value"
> 
> config VAL_SECOND
> 	bool "Second value"
> endif
> 
> if !ONLY_HAVE_ONE
> choice
> 	prompt "multiple values"
> 	default VAL_FIRST
> 
> config VAL_FIRST
> 	bool "First value"
> 
> config VAL_SECOND
> 	bool "Second value"
> endchoice
> 
> endif
> 
> I'd like not to have to repeat/duplicate VAL_FIRST, VAL_SECOND, etc..

A choice allow you to select multiple values if the type of all
choice entries are of type 'tristate' but this gets enabled
only when CONFIG_MODULES equal to 'y'.
So except if you really need the 'select multiple' when MODULES
are selected I see no easy way to achive what you want.

I did not try but carefull usage of 'depends on' could also help you
but it will get messy quite fast.

Maybe Roman can se a better way?

	Sam
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