linux-kernel - Re: kbuild question

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Message-Id: <A46E6EB1-4687-43BA-8DE9-BBAE7BD0D160@kernel.crashing.org>
Date:	Thu, 15 Feb 2007 17:44:42 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: kbuild question


On Feb 15, 2007, at 4:33 PM, Sam Ravnborg wrote:

> On Thu, Feb 15, 2007 at 01:18:52PM -0600, Kumar Gala wrote:
>> I was wondering if there was some way to make a Kconfig menu either
>> be just a menu or a choice depending on another bool being set or  
>> not.
>>
>> What I'm trying to accomplish is if CONFIG_ONLY_HAVE_ONE is set I
>> want it so you can only select on option, however if
>> CONFIG_ONLY_HAVE_ONE is not set you should be able to select multiple
>> options.
>
> You can do so using if.
> See following example:
> --------------------------------------------------------------
> config ONLY_HAVE_ONE
> 	prompt "only have one?"
> 	boolean
>
> if ONLY_HAVE_ONE
> config FOO
> 	bool foo
> 	default y
> 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
> --------------------------------------------------------------
>
> You should be able to modify this for the usage you ask for.
>
> Hope this is useful,

It is.

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..

- k
-
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