[yocto] RFC: Rapid iterative development

[Darren Hart]

On 11/19/2010 03:42 PM, Tian, Kevin wrote:
>> From: Darren Hart
>> Sent: Saturday, November 20, 2010 7:14 AM
>>
>> While working on a single package, I need to be able to tweak a variable
>> in the new recipe, change the MACHINE in local.conf, etc. I'd like to be
>> able to rapidly test my changes, but some of these changes trigger a
>> long list of dependencies for various commands. While working on a new
>> linux kernel recipe, I found it rebuilding a number of things that were
>> either -native (can I force it to use the system version rather than
>> building one) or seemed unrelated to the process at hand.
>
> That's interesting. Did you build from scratch or incrementally? Ideally only
> recipes being changed will be rebuilt in incremental way.

By changing machine type (and therefor architecture) I probably trigger 
at least all the non -native builds. These were clean builds. I'd just 
like to eliminate as much of that as possible when testing things like:

$ bitbake linux-linaro -c fetch

and

$ bitbake linux-linaro -c configure

>
>>
>> Are there some best practices for iterative recipe development that
>> speed things along?
>>
>
> "bitbake -k" is one method if you're sure the dependency doesn't change.
> But if you change MACHINE, I think a whole rebuild except -native will
> be required as it's the fundamental bit for target recipes.

OK, time to get this off the laptop and onto something with some serious 
storage then I guess.

-- 
Darren Hart
Yocto Linux Kernel