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 got one of my older versions out of storage, did a build and run and the same thing happened.
All copies of the same project (by name) now do the same thing. Run, 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 was wanting to change the name of the project anyhow, so I changed the name, and it works. Unfortunately, I can't seem to change the name of the folder containing the project. Using the file inspector, I'm able to change the names of almost everything, but info.plist wants to keep an extra copy of the old project folder name in it's path, as far as DerivedData and LLVM are concerned.
Right now I will continue working with the old project folder name, but new project name.
How do I make Xcode forget the old folder name?
As edited by John Caswell, the answer is basically covered by a careful reading of Duplicate and rename Xcode project & associated folders. I'm going to close this and resubmit the parts of the question that aren't answered.