title: How to build React-Native project with Xcode 12 Beta 4?
body: <p>When I try to build a project with Xcode 12 Beta 4 to test iOS14, I got a plenty of <code>Undefined symbols for architecture x86_64</code>. Every time I build the app, the list of errors is changed. Native libraries fail to recognize base React classes.</p>
  <p>I opened a issue in React-Native repository: <a href="https://github.com/facebook/react-native/issues/29633" rel="nofollow noreferrer">https://github.com/facebook/react-native/issues/29633</a></p>
  <p>A sample project with the error happening: <a href="https://github.com/igoriols/xcode12reactnativesample" rel="nofollow noreferrer">https://github.com/igoriols/xcode12reactnativesample</a></p>