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Date: Mon, 27 Oct 2014 11:03:54 -0700
From: Saul Wold <sgw@linux.intel.com>
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To: Gary Thomas <gary@mlbassoc.com>, 
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Subject: Re: Is the build system SCM sensitive?
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On 10/27/2014 09:50 AM, Gary Thomas wrote:
> I had a complete build (details probably don't matter) using
> Poky master.  I'm working on a fix to one of the core recipes,
> so I made a local branch:
>    % git checkout -b fix-python-pygtk master
> I made a single line change in the recipe (removing a line from
> the do_install step).  When I then rebuilt the recipe, to my
> surprise, there were more than 450 tasks (73 unique recipes)
> executed :-(
>
> How does this make any sense?  unless the build system cares
> that I changed the branch?
>
> n.b. I'm happy to provide more details if necessary.  Also, I
> did this twice in two different build trees and saw the same
> strangeness.
>
I think so additional info might be needed here, I am guessing that you 
are changing pygtk and somehow that is changing some dependency, you 
might try using bitbake-diffsigs between the 2 versions.

Sau!