When I build with Xcode (I am porting a large project with tons of errors at this point), is there a way to have it start with the CPP file that contains my main class (I obviously know this file) so I can correct errors there first?
I mean we have about 400,000 errors moving from CW to Xcode.
You can just compile that file on its own: select the file and then
Build=>Compile(or just Command-K). Once you have all the errors fixed there you can move on to a full build.