title: Sharing Package.swift configuration across Swift packages
body: <p>I have a project with many local Swift packages, and a lot of configuration is repeated across the <code>Package.swift</code> manifest files (compiler flags, etc).</p>
  <p>Is there a way to share this configuration? Or do we have to wait for the <a href="https://github.com/apple/swift-evolution/blob/main/proposals/0303-swiftpm-extensible-build-tools.md" rel="nofollow noreferrer">extensible build tools</a> in Swift 5.6?</p>