This book I got in a pile of FM TOWNS books turns out to be a lot more interesting that I was expecting an '80s C compiler manual to be. For as long as C and its relatives have been in mainstream use, it has been necessary to use vendor language extensions to actually get anything done with it, though in today's GCC/Clang/MSVC oligopoly those extensions tend to be focused on the yak-shaving detail
![The lost language extensions of MetaWare's High C Compiler](https://cdn-ak-scissors.b.st-hatena.com/image/square/4a78cc2a38a308278bf7e46471dcd1db3e8d2610/height=288;version=1;width=512/https%3A%2F%2Fstaging.cohostcdn.org%2Fattachment%2F0f3f6ae4-6caf-45a3-85e9-f212f4a8feba%2FIMG_9529.jpeg)