title: Google Ads using FireBase + CocoaPods gives error: "duplicated symbols for architechture x86_64"
body: <pre><code>target 'myapp' do
  pod 'Firebase/Core'
  #the other projects not related with Firebase
  use_frameworks!
  end
  </code></pre>
  
  <p>leads to this error:</p>
  
  <blockquote>
    <p>51968 duplicated symbols for architechture x86_64</p>
  </blockquote>
  
  <p>the callstack consists of compiled classes from the other frameworks.</p>
  
  <p>Swift 3 , XCode 8.</p>
  
  <p>Without this pod (FireBase) my project works correctly.</p>