Binary packages not rebuilding against updated libraries

[Ryan Schmidt]

On Apr 25, 2018, at 14:14, Perry E. Metzger wrote:

> I don't know that this is needed. As I noted, there are other package
> systems that just note that they have to rebuild dependents if a
> package they depend on has a major version bump.
> 
> Or maybe I don't understand the problem well enough?

By what means should MacPorts know that the port it just built has a newer library version than the previous version of the port?

By what means should MacPorts know the list of ports that have to be rebuilt as a result?