title: Can I use Swift 5 to build targets that are written in Swift 3
body: <p>In early 2019 or late 2018 Apple will release Xcode 10.x with Swift 5. In my project I use a Cocoa pods which are written in Swift 3 and abandoned by the author.</p>
  
  <p>I would like to know if I have to replace the pods or upgrade or maybe I can leave them as they are. If Swift 5 will build targets written in Swift 3, I can continue to use pods written in Swift 3 as they are, if not, I how to upgrade/change it.</p>
  
  <p><strong>Question:</strong>
  Does Swift 5 build targets that are written in either Swift 4 or Swift 3?</p>