Xcode 9 Bug: Cannot find cdtool

ios xcode xcode8 xcode9
Jason C. Howlin picture Jason C. Howlin · Jun 10, 2017 · Viewed 7.6k times · Source

After installing Xcode 9 beta, Xcode 8 gives me an error when compiling a project:

Cannot find cdtool at '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Agents/cdtool': Cannot find a simulator runtime for platform <DVTPlatform:0x7fd67af0a930:'com.apple.platform.iphonesimulator':<DVTFilePath:0x7fd67af0a7c0:'/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform'>>.

I suspect Xcode 9 modified some shared state with Xcode 8 (set a path, overwrote a file, etc.). But I've tried deleting and both Xcodes to no avail.

The project uses Core Data and it's clearly failing when trying to compile the xcdatamodel.

I can still compile and run under Xcode 9.

Answer

Jason C. Howlin picture Jason C. Howlin · Jun 11, 2017

An Apple engineer reached out about this...

Those of you with cdtool errors in Xcode 8, I suspect you installed the iOS 10.3 Simulator runtime from Xcode 9. It was discovered this week that this causes a problem with cdtool in Xcode 8.3.

You can work around that by moving iOS 10.3.simruntime aside and restarting CoreSimulatorService (source): 

sudo mkdir /Library/Developer/CoreSimulator/Profiles/Runtimes/Backup 

sudo mv /Library/Developer/CoreSimulator/Profiles/Runtimes/{,Backup/}iOS\ 10.3.simruntime 

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

Then restart Xcode, Simulator, etc. Those of you that deleted CoreSimulator.framework and thus cannot run Xcode.app any more can reinstall CoreSimulator.framework with: 

installer -pkg /Applications/Xcode-beta.app/Contents/Resources/Packages/XcodeSystemResources.pkg -target /

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