Setting up gcov in Xcode 3.1

I'm trying to setup my Xcode project to be instrumented with gcov so I can determine the code coverage of my unit tests. All of the documentation I find online talks about settings that I don't find in Xcode 3.1, though. An example:

To work with Coverstory, first you need to set up your target to work with gcov. Th开发者_JAVA技巧is requires turning on "Instrument Program Flow", "Generate Test Coverage Files" and linking with the gcov library. (Using Coverstory)

The closest thing I can find to "Instrument Program Flow" and "Generate Test Coverage Files" in my build settings is "Generate Profiling Code", which doesn't appear to do what I want it to do.

Am I looking in the wrong place for these settings or are all of the examples I'm finding online stale?

Update: I've looked back at my notes when I first set this up - your "Base SDK" has to be the same as your current build target, otherwise the options you need won't appear:
http://iphonesdkdev.blogspot.com/2009/05/xcode-gcc-section-missing-in-build.html

FYI, my "Instrument Program Flow" and "Generate Test Coverage Files" options show up underneath heading "GCC 4.0 - Code Generation".

I remember similar problems with build settings being hidden - usually it is because of a dependency on another build setting, e.g. two from my project that I know matter are:
-C/C++ Compiler Version = GCC 4.0
-Base SDK = iPhone Simulator 2.1 (missing)

You may also want to check out the Google Toolbox For Mac Xcode Plugin which adds menu items for easily setting up code coverage:

http://code.google.com/p/google-toolbox-for-mac/wiki/GTMXcodePlugin