[bug #53152] Intermittent timeout running regression test features/output_sync

[Michael Olbrich]

Follow-up Comment #3, bug #53152 (project make):

I think the problem is the outer loop in update_goal_chain():

- All goals are handle once per loop iteration.
- At the beginning of each iteration at least on child is reaped (if any
exist)

What happens is this:
First iteration:
- job for 'bar' is started
- child for 'bar' is reaped
- job for 'baz' is started
Second iteration:
- reap_children() waits forever for a child to finish

I think, reap_children() should only wait if no new action can be taken. I'm
not sure if that information is available. Maybe 'nothing changed' in the last
iteration (accumulating 'g->changed') is a good approximation?

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