Making portable my unportable transputer C compiler

It's always a delight to read about your projects, Oscar. Every program is a jewel.

how does a debug file output 8GB+? Is it running for minutes/hours? Or is it in a format that uses a lot of rich text? I would assume a text file in hex or unicode wouldn't use very much.. Is there a way to create intervals of log files so they have a cap on the size?