Umm, your XML binding stuff is great, but I would need a refactoring tool to go into Perl code, figure out what bits of it are actually C++ that are going to be output later, and change that. I would be really, really surprised if you have a tool capable of handling that routinely.

It's true I've never really worked on a project with more than a million lines of code, though. My core work is more on the scale of 300,000 lines of code.