Comment by InvisibleUp

Where the flexible integer sizes break the most is when dealing with ABIs, which weren't really a concern before dynamic linking existed but are very much a concern today. We've also, for some reason, decided that the standard way of defining a library ABI is with a C header. That means that everyone has to worry about precisely defining integer sizes, as well as more esoteric types like size_t or intmax_t. Good writeup on all that here: https://thephd.dev/to-save-c-we-must-save-abi-fixing-c-funct...