Xcode 4: Auto-complete & Jump to Definition broken in my Xcode 3 Project

Question

My project was created in Xcode 3, I\'m opening it in Xcode 4 and notice the following:

• \'Jump to Definition\' no longer works with my own symbols

Answer 1

I had the very same problem here. No definition links, code sense or syntax highlighting. Removing derived data didn't work and even creating a new project did not make any difference. While it may not be the same problem you have, cleaning up the build settings (so that there are no conflicts between project and targets) like Rick said solved it for me (though I still don't know which setting(s) was/were causing the problem).