Xcode: Running a script before every build that modifies source code directly

Question

What I did:

I have a script that

1. Read some configuration files to generate source code snippets
2. Find relevant Objective-C source files and

Answer 1

As of Xcode 4, it looks like if you add the generated files to the output section of the build phase, it will respect that setting, and not generate the ... has been modified since the precompiled header was built error messages.

This is a good option if your script is only generating a handful of files each time.