Xcode 8 - Command failed due to signal: Illegal instruction: 4

Question

I just migrated my project to Swift 3.0 using Xcode 8. The app is working fine on a device and in the simulator. However, when I archive it in preparation to upload to app store I get stuck with the error:

Command failed due to signal: Illegal instruction: 4

I have cleaned the build and removed the derived data folder. CocoaPods installations are up-to-date. I tried commenting out all code related to dictionaries that was the solution to this similar Xcode 7 issue, but I still get the error.

In case it's helpful the full error print out is below. I'm not sure how to interpret this to pinpoint the location of the issue better.

Edit:

The ResultsTableViewCell file is the last one in this long list. Perhaps that is where the issue? An earlier line in the error code below calls out the following about that file:

/Users/AppleComputer/Desktop/Funyado/Funyado/ResultsTableViewCell.swift -target arm64-apple-ios9.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk

It's the only on that talks about ios9.0 target. The file itself is just for a simple xib. I'm going to try to explore around this file and xib more. This could also just be the last file listed because all of them are listed in this error print out.

Anyways, besides that lead, I'm completely stuck at this point and unsure how to proceed to diagnose the issue. Any thoughts and help are greatly appreciated.

---

CompileSwift normal arm64 cd /Users/AppleComputer/Desktop/Funyado /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -emit-bc /Users/AppleComputer/Desktop/Funyado/Funyado/ForgotPasswordViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/DetailedResultWebViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/SearchHistoryModel.swift /Users/AppleComputer/Desktop/Funyado/Funyado/SearchHistoryViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalDemographics.swift /Users/AppleComputer/Desktop/Funyado/Funyado/RecommendationModel.swift /Users/AppleComputer/Desktop/Funyado/Funyado/Recommendation.swift /Users/AppleComputer/Desktop/Funyado/Funyado/AdditionalPersonalCharacteristicsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/DetailedResultsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/LoginViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalPsychographics.swift /Users/AppleComputer/Desktop/Funyado/Funyado/BottomNavigationBar.swift /Users/AppleComputer/Desktop/Funyado/Funyado/RegisterViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/ProfileViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalOther.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalActivity.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalFood.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PsychographicsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/Extensions.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PageViewControllerHolder.swift /Users/AppleComputer/Desktop/Funyado/Funyado/AppDelegate.swift /Users/AppleComputer/Desktop/Funyado/Funyado/MainSearchViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalPets.swift /Users/AppleComputer/Desktop/Funyado/Funyado/ContactUsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/UserInformation.swift /Users/AppleComputer/Desktop/Funyado/Funyado/ResultsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/EnterNewPasswordViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/SearchLocationResultsController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PhotoViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/PersonalNumberChildren.swift /Users/AppleComputer/Desktop/Funyado/Funyado/InstructionsViewController.swift /Users/AppleComputer/Desktop/Funyado/Funyado/ResultsTableViewCell.swift -target arm64-apple-ios9.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.0.sdk -I /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/BuildProductsPath/Release-iphoneos -F /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/BuildProductsPath/Release-iphoneos -F /Users/AppleComputer/Desktop/Funyado/Pods/FirebaseAnalytics/Frameworks/frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/FirebaseAuth/Frameworks/frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/FirebaseDatabase/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/FirebaseInstanceID/Frameworks/frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/FirebaseStorage/Frameworks/frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleInterchangeUtilities/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleMaps/Subspecs/Base/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleMaps/Subspecs/Maps/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleNetworkingUtilities/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GooglePlaces/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleSymbolUtilities/Frameworks -F /Users/AppleComputer/Desktop/Funyado/Pods/GoogleUtilities/Frameworks -F /Users/AppleComputer/Desktop/Funyado -g -import-objc-header /Users/AppleComputer/Desktop/Funyado/Funyado/Funyado-Bridging-Header.h -module-cache-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/ModuleCache -serialize-debugging-options -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Funyado-generated-files.hmap -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Funyado-own-target-headers.hmap -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Funyado-all-non-framework-target-headers.hmap -Xcc -ivfsoverlay -Xcc /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/all-product-headers.yaml -Xcc -iquote -Xcc /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Funyado-project-headers.hmap -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/BuildProductsPath/Release-iphoneos/include -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Firebase/Analytics/Sources -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/Firebase -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/FirebaseAnalytics -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/FirebaseAuth -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/FirebaseDatabase -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/FirebaseInstanceID -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/FirebaseStorage -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GoogleInterchangeUtilities -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GoogleMaps -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GoogleNetworkingUtilities -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GooglePlaces -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GoogleSymbolUtilities -Xcc -I/Users/AppleComputer/Desktop/Funyado/Pods/Headers/Public/GoogleUtilities -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/DerivedSources/arm64 -Xcc -I/Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/DerivedSources -Xcc -DCOCOAPODS=1 -Xcc -working-directory/Users/AppleComputer/Desktop/Funyado -emit-module-doc-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/Funyado.swiftdoc -O -module-name Funyado -emit-module-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/Funyado.swiftmodule -emit-objc-header-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/Funyado-Swift.h -serialize-diagnostics-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ForgotPasswordViewController.dia -emit-dependencies-path /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ForgotPasswordViewController.d -num-threads 4 -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ForgotPasswordViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/DetailedResultWebViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/SearchHistoryModel.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/SearchHistoryViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalDemographics.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/RecommendationModel.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/Recommendation.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/AdditionalPersonalCharacteristicsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/DetailedResultsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/LoginViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalPsychographics.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/BottomNavigationBar.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/RegisterViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ProfileViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalOther.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalActivity.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalFood.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PsychographicsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/Extensions.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PageViewControllerHolder.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/AppDelegate.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/MainSearchViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalPets.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ContactUsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/UserInformation.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ResultsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/EnterNewPasswordViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/SearchLocationResultsController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PhotoViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/PersonalNumberChildren.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/InstructionsViewController.bc -o /Users/AppleComputer/Library/Developer/Xcode/DerivedData/Funyado-ehusaveyfxvoqqhkifknkgpejzbx/Build/Intermediates/ArchiveIntermediates/Funyado/IntermediateBuildFilesPath/Funyado.build/Release-iphoneos/Funyado.build/Objects-normal/arm64/ResultsTableViewCell.bc

Answer 1

I found a work around solution. Under Build Settings and Optimization Level, I changed the Optimization Level to "Fast, Single File Optimization" instead of "Fast, Whole Module Optimization". After doing that it successfully compiled and I could upload it to the app store.

The reason that the app was working for me in the simulator and on my device was because by default the optimization level for Debug is set to "None".

It's not ideal, but given that Swift 3 is so new, and that this might be a bug or something I could more easily fix in future with updates, this route will do for now.