title: Xcode 9 - failed to emit precompiled header
body: <p>I have a project in Objective-C as well as in swift by taking <code>MyProjectName-Bridging-Header.h</code> and i also configured the Objective-C Bridging Header. 
  Also i have added 'MyprojectName-Swift.h' in .pch file.</p>
  
  <p>This works fine on xcode 8.2 but when i build my project from xcode 9 i am getting the below error. </p>
  
  <blockquote>
    <p>failed to emit precompiled header
    '/Library/Developer/Xcode/DerivedData/MyprojectName-lajanjvhqjnfjksdsndsfkads/Build/Intermediates.noindex/PrecompiledHeaders/MyprojectName-Bridging-Header-swift_44AHJm3Z96qu-clang_2BIMGQVXGEZ09.pch'
    for bridging header
    '/Documents/MyProjectLocaiton/FoneApp-Bridging-Header.h'</p>
  </blockquote>
  
  <p>Please help me out from this. Thanks!</p>