nostr:npub1ch8nj9yu4676fnwkzacu28mt4y002ezeryqyuhzfnzjw560sq5fqaysw60 nostr:npub17jqvr0kp48sjwctcvhre8lk87yr5qqe726zkunwq2uhtd35wdx4sgkv996 I don't care about the first C compilers. I care about the compilers we have today, in the year or our Lord 2023.

As far as I know, both gcc and clang implement C99 thoroughly except some floating point pragmas (https://en.cppreference.com/w/c/compiler_support). Dunno about the later standards and don't really care that much about them.