title: app with Objective-C and swift code crash at launch in release mode, debug mode fine
body: <p>My project is Objective-C based, and have some third party swift code.</p>
  
  <p>The app runs fine at debug mode, however, when I archive the app as release mode, the app will crash at launch screen.</p>
  
  <p>Set swift optimization level to None still has the same issue. I have crashlytics 3.7 installed, but it crashes at launch, it didn't have a chance to upload the crash. I am very desperate. Any ideas?</p>
  
  <p>Update:</p>
  
  <p>I tried to remove all swift stuff and archive, everything is as usual now. However, once I drag the swift files into my Objective-C based project, Run(debug) the app is fine. But if archive(release) and install it on iPhone, immediate crash at launch. Anything what I am missing?</p>