Commits on Sep 18, 2018

1. Use Xcode legacy build system for iOS builds (flutter#21901) …

   Xcode 10 introduces a new build system which includes stricter checks on
   duplicate build outputs.
   
   When plugins are in use, there are two competing build actions that copy
   Flutter.framework into the build application Frameworks directory:
   
     1. The Embed Frameworks build phase for the Runner project
     2. The [CP] Embed Pods Frameworks build phase that pod install creates
        in the project.
   
   Item (1) is there to ensure the framework is copied into the built app
   in the case where there are no plugins (and therefore no CocoaPods
   integration in the Xcode project). Item (2) is there because Flutter's
   podspec declares Flutter.framework as a vended_framework, and CocoaPods
   automatically adds a copy step for each such vended_framework in the
   transitive closure of CocoaPods dependencies.
   
   As an immediate fix, we opt back into the build system used by Xcode 9
   and earlier. Longer term, we need to update our templates and
   flutter_tools to correctly handle this situation.
   
   See: flutter#20685

   

   cbracken committed Sep 18, 2018
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