title: What does the "Embedded Content Contains Swift Code" build setting in Xcode 6 do?
body: <p>It's a new setting under "Build Options". What does it do? I can't seem to find any documentation about it. My guess is this: Does it have to be set to <code>YES</code> in a mixed Objective-C/Swift app to tell Xcode to link against the Swift Runtime?</p>