swift failed with exit code 1 while compiling in Xcode - possibly related to Bridging-Headers

Question

I have an Obj-C Project I\'m trying to migrate to Swift. I did succeed with various classes but recently ran into an issue I can\'t seem to make sense of. When I try to comp

Answer 1

In my case it was wrong method overriding. Base class:

open func send(_ onSuccess: @escaping ((SomeType) -> Void)) -> SomeType { }

Subclass:

open override func send(_ onSuccess: ((SomeType) -> Void)) -> SomeType { }

As you see @escaping is missing. Swift3 converter in XCode8 doesn't consider inheritance relations, moreover, that type mistakes aren't marked as errors.

Answer 2

In My Case it was Simulator bug just uninstall app from simulator and clean project then run project.

Answer 3

I did the same all answer says but mine issue was not resolved. I did figured out that issue was related to broken function call.

A function syntax was not wrong but its calling mechanism was wrong.

To check the exact error for this issue check following:

Select issue navigator > Click on error will show logs for error > In that select All Messages tab.

This will show all detail logs for this error.

Scroll down and You got logs like, in my case

So, by reading this I figure out that something wrong with function calling. I browse my code and resolved it, Below was correct and wrong code.

Wrong Way:

var region = MKCoordinateRegionMake(self.mapView.userLocation.coordinate, span)
// It will not shown error here but when you build project compiler shows error.

Right Way:

let region = MKCoordinateRegion(center: self.mapView.userLocation.coordinate, span: span)

Answer 4

I had the same error message. What helped, was to set the optimization level in the swift compiler settings to None. This is not really a solution for me and I think that's one of the many bugs in the swift compiler.

Answer 5

Thank you @Kampai for the advice on going through the error log message. I read through, and some files were missing:

<unknown>:0: error: no such file or directory:  

Somehow, some files were removed during a pull from GitHub. The files are in the directory, but not in the Xcode project.

Right click on a folder and click 'Add files to ...' to manually add missing files to Xcode. That fixed the problem for me.

This happened to me several times already, but now I know how to fix it \o/

Answer 6

I was getting the same error for including this code in a didSet block:

didSet {
  // Test whether this view is currently visible to the user.
  if super.isViewLoaded() && (super.view.window != nil) {
    // (build fails even if this block is empty)
  }
}

It took a lot of trial/error to hunt this down. Removing super. allowed the build to proceed.