A want the second bone's tail to stretch to the third's head.
I have tried to use the Stretch To constraint but then I would need the target to be at the tail at start.
Is there a way to force the tail position to the thirds head?
It's a bit confusing... The bone has only one position in pose mode, but in edit mode it has two positions (head and tail). So when using the stretch to constraint all it can do is to scale the bone. What I really want is to adjust the length of the bone but that attribute doesn't makes sens in pose mode.
The end goal of this is to create joins aligned to other objects and then Apply Pose As Rest Pose.
I'm starting to think it wasn't a good idea.
[Edit] There is apparently no way of doing this using bone constraints only. It could be done with an intermediate object constraint but it would be a complicated and not a useful solution.