GM release of Xcode 6 compile

Question

I just downloaded the GM release of Xcode 6 and it won't compile with this error:

Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1

Any ideas on how to fix this?

Answer 1

This error can happen for numerous reasons, so this is meant to be a debugging hint. You may want to try using xcodebuild in the command line. It will give you details as to what files are the culprits.

To do this, open Terminal and go to your project folder. Once there, type in

xcodebuild -project YourProject.xcodeproj -scheme YourScheme

or if you're working in a workspace

xcodebuild -workspace YourProject.xcworkspace -scheme YourScheme

You may see A LOT of messages pop up, but at the very end of the output you should see the specific files that are causing the crash. Back in XCode, go into those files and start playing with some of the Swift syntax to see what's going on. In my case, it had to do with the setAttributeString function, but I've seen other people have issues with ! and ?.

Hopefully that will get you headed in the right direction.

Answer 2

I had to change my "Optimization Level" to None[-0none]

Target > Build Settings > Swift Compiler > Optimization Level.

Answer 3

My case was a little bit different and it involves enums and optionals. For the simplicity lets define

enum Animal {
    case Dog
    case Cat
}

func exampleAction(animal: Animal) {}

exampleAction(.Cat)

It will run OK. However as soon as I made the argument optional the error started to appear. So this code won't work:

func exampleAction(animal: Animal?) {}

exampleAction(.Cat)

To make it work I had to add explicit enum name in the method call. So the following code worked again:

exampleAction(Animal.Cat)