I recently updated Xcode and I got the following warnings:
I tried Editor
In XCode 6 the Warning is now accompanied with dimensions indicating where the view will be placed given the current constraints. If your constraints are correct (or you believe them to be) and the view (eg. a label) is not at that location, try changing the view's dimensions to the expected dimensions in the warning. If the view ends up in the right place and the warning goes away, it confirms that your constraints are working as expected.
Simply removing the constraints may remove the warning but won't necessarily give you the Auto Layout behavior you are hoping for.