I have an Xcode project with an iOS app that uses another project, say Rest Kit, that is actually a Git submodule.
I want to effect a change in the build settings of RestKit, for good reason, when I build a debug build but at no other time. I don't want to modify the build settings itself because it may just be the one app I need to make the change for. And any change made will appear as a changed file in Git.