That brings back some memories from my early days. I worked on a project that had decided to use the newish C language for a 68000-based system. They chose Whitesmith compiler for it, probably because it was the only one available. For some reason, I was selected to attend a class on learning C and became responsible for installing the compiler and assisting the other engineers on using it. The project was ultimately successful but I don't recall what issues we had with it. I do remember contacting Whitesmith a couple of times to resolve some problems. I guess it possible I was talking directly to P.J. Plauger himself, although, at that time, I would have had no idea who he was.
I remember using that compiler for M68K in the mid-80s, cross-compiling on a DEC Vax. The debug monitor we were using only displayed hex, no disassembly. The compiler was so predictable that I could locate the memory location for any C statement easily. It made patching code in memory a simple task.
It brings back memories for me too. This compiler was my first introduction to C, before that I'd used Pascal or Fortran. I worked on Z80 but we also had a 68K project which ran Whitesmith's Idris UNIX clone before we got real System III ported