title: No previous extern declaration for non-static variable 'FrameworkNameVersionString'
body: <p>I created an iOS framework say CustomFramework and in the CustomFramework.h file created by Xcode has the following contents by default</p>
  
  <pre><code>#import &lt;UIKit/UIKit.h&gt;
  
  //! Project version number for CustomFramework.
  FOUNDATION_EXPORT double CustomFrameworkVersionNumber;
  
  //! Project version string for CustomFramework.
  FOUNDATION_EXPORT const unsigned char CustomFrameworkVersionString[];
  
  // In this header, you should import all the public headers of your framework  using statements like #import &lt;CustomFramework/PublicHeader.h&gt;
  </code></pre>
  
  <p>When I build the project, I get these warnings </p>
  
  <pre><code>No previous extern declaration for non-static variable 'CustomFrameworkVersionNumber'
  No previous extern declaration for non-static variable 'CustomFrameworkVersionString'
  </code></pre>
  
  <p>Any idea why the default framework creation would give these warnings ?</p>