How to fix: Xcode 9 building loop until exit code 255
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Please don't mark as duplicate since available threads haven't provided a valid solution. Since Xcode 9 one of my projects is stuck in a building loop. The project is building. Running on iPhone and building again and again. Even builds over and over while coding without asking for build or run. After cleaning, cleaning build folder, deleting Derived Data and restarting, the project crashes after build with: Command /Applications/Xcode.app/Contents/Developer/usr/bin/ibtool failed with exit code 255. The tool may have crashed. Please file a bug report at http://bugreport.apple.com with the above output and attach any crash logs for ibtool, ibtoold, Xcode, and Interface Builder Cocoa Touch Tool created around the time of this failure. These logs can be found in ~/Library/Logs/DiagnosticReports