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         


        

Answer 1

I have the following code showing build error in Release.

if myValue > 5 { myValue = 5.0 }
if myValue < 0 { myValue = 0 }

Adding else between if statements fixed the issue:

if myValue > 5 { myValue = 5.0 }
else
if myValue < 0 { myValue = 0 }

Demo: https://github.com/exchangegroup/build-error-demo

Xcode Version 6.1 (6A1052d). Builds alright in debug. Submitted ticket to Apple Bug Reporter.

Answer 2

Go to the folder: Users/user/Library/Developer/Xcode/DerivedData

and clear all file,

then then clean and analyze,

It`s work to me.

Answer 3

I see many reasons. My answer is not a generic solution but just adding yet another case that provide to that error. In my case it was setting a button's title like this:

button!.setTitleColor(.whiteColor(), forState: UIControlState.Normal)

instead of this:

button!.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)

Answer 4

Just to put this out there: I get this error whenever I put [unowned self] in a block within a block, like this:

lazy var someVar: SomeType = {
    self.successBlock = {[unowned self] in
        // ...
    }
}()

The solution is to put the [unowned self] only at the topmost-level block. It seems an unowned reference to self is handled automatically for blocks within blocks.

Of course, I was only able to find this error by first finding out the troublesome file via @Maxwell's answer: https://stackoverflow.com/a/26848000/855680

Answer 5

May be the same issue Swift compile error in XCode 6 GM

I had the same problem, then I use git checkout old versions to find which commit cause the problem, and try to find the key problem code. My key problem code is something like this

func afunc() {
    class AClass() {
    }
    let ac = AClass()
    //....
}

Other code could make the same problem, occur in Swift Optimization, and swift compiler doesn't tell you the exact location. This must be a bug by Apple.

Answer 6

Maxwell's solution gives you the closest hint.