Xcode 8: Symbol(s) not found for architecture arm64 for pods

Question

After updating to Xcode 8, the app won't run on devices, only on the simulator. The errors are thrown for all pods added to the project:

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_AFNetworkReachabilityManager", referenced from:
      objc-class-ref in FeedViewController.o
  "_OBJC_CLASS_$_TSMessage", referenced from:
      l_OBJC_$_CATEGORY_TSMessage_$_Override in NotificationMessenger.o
      objc-class-ref in NotificationMessenger.o
  "_OBJC_CLASS_$_AFHTTPRequestSerializer", referenced from:
      objc-class-ref in HTTPSessionTask.o
  "_OBJC_CLASS_$_AFJSONRequestSerializer", referenced from:
      objc-class-ref in HTTPSessionTask.o
  "_OBJC_METACLASS_$_SWTableViewCell", referenced from:
      _OBJC_METACLASS_$_MessagesCell in MessagesCell.o
      _OBJC_METACLASS_$_PaymentMethodCell in PaymentMethodCell.o
      _OBJC_METACLASS_$_SwipeTitleCell in SwipeTitleCell.o
  "_OBJC_CLASS_$_FBRequestConnection", referenced from:
      objc-class-ref in FacebookManager.o
  "_OBJC_CLASS_$_SWTableViewCell", referenced from:
      _OBJC_CLASS_$_MessagesCell in MessagesCell.o
      _OBJC_CLASS_$_PaymentMethodCell in PaymentMethodCell.o
      _OBJC_CLASS_$_SwipeTitleCell in SwipeTitleCell.o
  "_OBJC_CLASS_$_FBRequest", referenced from:
      objc-class-ref in FacebookManager.o
  "_OBJC_CLASS_$_AFURLSessionManager", referenced from:
      objc-class-ref in HTTPSessionTask.o
  "_OBJC_CLASS_$_Branch", referenced from:
      objc-class-ref in MyImpactViewController.o
      objc-class-ref in UINavigationController+Activity.o
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_FBSession", referenced from:
      objc-class-ref in FacebookManager.o
      objc-class-ref in ExternalFacebookCommand.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

For each of the files, this warning is also thrown:

file was built for archive which is not the architecture being linked (arm64)

Active architectures are OK, I've tried deleting derived data folder, reinstalling the pods, setting Build Active Architectures Only to YES and NO, but nothing works.

My Podfile looks like this:

platform :ios, '8.0'
workspace 'Purple'
target 'Purple' do
pod 'AFNetworking', '2.6.3'
pod 'SAMKeychain', '~> 1.3'
pod 'TSMessages'
pod 'Facebook-iOS-SDK', '~> 3.23.2'
pod 'SWTableViewCell'
pod 'CardIO'
pod 'Parse'
pod 'PureLayout'
pod 'Branch'
pod 'DZNEmptyDataSet'
end

Answer 1

Try clear the XCode caches:

rm -rf ~/Library/Developer/Xcode/DerivedData/

Clear the CocoaPods caches and reinstall the dependencies:

rm -rf "${HOME}/Library/Caches/CocoaPods"
rm -rf "`pwd`/Pods/"
pod update

Finally go to the "Pods" project and set the Build Active Architectures Only to No also for the "Debug" configuration.

Reference https://stackoverflow.com/a/37930840/1773009

Answer 2

"The OPN [Debug] target overrides the OTHER_LDFLAGS build setting". This was the main issue. After adding $(inherited) in new line in other linker flags solved my issue.