[yocto] [PATCH] bb.build.addtask: add simple check for circular dependency

[Ulf Samuelsson]

> 18 jan. 2019 kl. 16:56 skrev Alexander Kanavin <alex.kanavin at gmail.com>:
> 
> 
> 
>>> On 18 Jan 2019, at 16.34, Burton, Ross <ross.burton at intel.com> wrote:
>>> 
>>> On Fri, 18 Jan 2019 at 15:08, Ulf Samuelsson <yocto at emagii.com> wrote:
>>> We could insert a check if the KNOWN_TASKS is valid in a verification test.
>>> When building core-image-minimal, the task order within core-image-minimal is analyzed, (dependencies on all other recipes is filtered away).
>>> Then you find out if there are tasks added, missing, and/or in the wrong order.
>> 
>> What about people who add new tasks?  Do they now need to go and
>> extend KNOWN_TASKS correctly too?
> 
> I might be missing something, but isn’t the right moment to detect loops when the task graph is fully formed? Then just run generic DFS on it, not a difficult or heavy algorithm.
> 
> Alex

The problem in our system was that the build crashed before that.

Best Regards,
Ulf Samuelsson