title: “Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift
body: <p>I just did the last Xcode update (8.3), and I have the message : </p>
  
  <p><strong>“Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift. Use the [Edit > Convert > To Current Swift Syntax…] menu to choose a Swift version or use the Build Settings editor to configure the build setting directly.</strong></p>
  
  <p>Knowing that the "Use Legacy Swift Language Version" option has just been removed from the build settings, how can I generate my app in Swift 2.3 without doing any conversion for now ?</p>