I do a lot of my coding on osx, and was getting annoyed that I could not pick a specific compiler from within Xcode that I had installed. Using makefiles is an option but I wanted to see if I could add a new compiler to Xcode 4. This guide was the basis for mine, tweaked for Xcode 4 Xcode 4 and gcc-4.7 will be used as the example, in theory any compiler can be used (I have not tested this). This r