linux-kernel - Re: make oldnoconfig fix?

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Date:	Mon, 02 Dec 2013 20:58:13 -0600
From:	Rob Landley <rob@...dley.net>
To:	David Cohen <david.a.cohen@...ux.intel.com>
Cc:	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	linux-kbuild@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	mmarek@...e.cz, rostedt@...dmis.org
Subject: Re: make oldnoconfig fix?

On 11/11/2013 12:55:37 PM, David Cohen wrote:
> On 11/11/2013 10:13 AM, Yann E. MORIN wrote:
>> David, All,
> 
> Hi Yann,
> 
>> 
>> On 2013-11-11 10:11 -0800, David Cohen spake thusly:
>>> Is there a plan to fix 'make oldnoconfig' option?
>>> I currently have need to it :)
>>> I've tracked a thread fixing 'make olddefconfig' where 'oldnoconfig'
>>> option is reported as a known bug, right?
>> 
>> Sorry, I don't understand what your problem is.
> 
> Maybe I assumed it was more 'known' then it actually is :)
> 
>> 
>> Care to explain in details what problem you have:
>>    - what you start with
>>    - what you do
>>    - what you get
>>    - what you expected
> 
> The bug with 'oldnoconfig' is: 'make oldnoconfig' is just an alias to
> 'olddefconfig'. Any non-existent config is defined with its default
> value instead of 'N'.
> 
> I work with embedded platforms. I need to maintain a set of defconfigs
> for different products (customers some times want tailored configs, so
> creating a generic one isn't an option always).

make allnoconfig KCONFIG_ALLCONFIG=oldconfigfile

I use this trick in  
http://landley.net/aboriginal/FAQ.html#dev_miniconfig

And yes, I submitted it upstream a couple times last decade, with  
documentation and everything:

   https://lwn.net/Articles/160497/
   https://lwn.net/Articles/161086/
   http://lkml.indiana.edu/hypermail/linux/kernel/0607.0/1805.html

Rob--
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