After Xcode Crash app doesn't do anything but eat memory.

I'm using Xcode Version 6.4 (6E35b)on a mid 2013 MacBook Air running OS X 10.10.5.

A few days ago, with my code in something of a tangle, Xcode crashed. After the crash, my app built and ran, but didn't do anything except eat memory at a fantastically fast rate.

I keep a git repository and every now and then a put a copy of the whole project folder on an offsite location.

I've tried both using earlier commits and reloading saved projects. All of these had compiled and worked properly previously.

All copies of the same project (by name) now do the same thing. Eat memory, and nothing else.

I tried removing DerivedData, removing contents of /var/folders/, removing and replacing schema (in schema -> manage), removing all projects, emptying trash, and have removed Xcode (using "trash me") and reinstalling. No joy. Still the same thing.

I'm able to move my project forward by copying the project to a new folder and changing the project name, so I don't have a complete disaster on my hands.

But I can't figure out how to find whatever it is that is messed up in Xcode in the original project.

via Chebli Mohamed