Are you using the 'compiletc.tcz' meta-extension (or only a gcc extension without all the others)? If not using 'compiletz.tcz' you are likely to miss some required component.
Have you actually tried to compile something yourself? I'd call that my "hello world test": it means to create a minimal source file (e.g. containing the infamous statement to print "hello world"), compile it, and execute the compilation result.