Xcode: Build Failed, but no error messages

Question

Using Xcode 4.5.1. Our project has been building fine for the last three months, but suddenly, when I try to build, it says \"Build failed\", but does not show any errors on the

Answer 1

This happened to me while I was writing in Swift 4.1 in XCode 9.3. I use RxSwift also. It never happened while I was writing in Objective C. There were no any logs in Report Navigator too. Project just compiled without errors, then failed. Couldn't figure out why.

In my case what I did and it helped:

1. Commit changes in Git and then discard changes in XCode if it shows "M" near files
2. Clear derived data: Xcode -> Preferences -> location
3. Clean build folder: Shift + Cmd + Alt + K
4. Restart XCode

After this project tried to compile and showed errors. The error was here:

do {
    let jsonData = try JSONSerialization.data(withJSONObject: timingsDict, options: .prettyPrinted)
    let decoder = JSONDecoder()
    let pTiming = try decoder.decode(PTiming.self, from: jsonData)
    observer.onNext(timing)
    observer.onCompleted()
} catch {
    print(error.localizedDescription)
    observer.onError(error)
}

I passed wrong variable name in observer.onNext(timing). It should have been pTiming.

Answer 2

Other answers helped me find the Report Navigator. The only error displayed was:

Build operation failed without specifying any errors. Individual build tasks may have failed for unknown reasons. One possible cause is if there are too many (possibly zombie) processes; in this case, rebooting may fix the problem.

I fixed this by closing the Simulator.

Answer 3

Figured it out. On the tab with three lines in a speech bubble, it shows a build log. I guess my storyboard file had become corrupt during the last git pull.

Answer 4

You can see reasons for failure on Report Navigator present in Navigator window.

• Open Navigator by pressing Hide/Show Navigator button present in top-left side of Xcode.

• Open Report Navigator by pressing last button present on list of buttons in Navigator window.

Here you can view reasons either By Group or By Time

Answer 5

There might be no free disk space left.

Answer 6

With me it was the dev provisioning profile I was using for that scheme. I changed it to release and it worked