[pjmlp]

Back when I still wrote C at work, it meant Aix xlC, HP-UX aCC, Solaris Forte, Red-Hat Linux GCC, Windows MSVC and C++ Builder.

Nowadays most are indeed clang and GCC forks, or MSVC.

[duped]

That's what I mean, I've seen enough autoconf "checking for <feature that totally works in every compiler you care about>" noise to know it's mostly pointless in this day in age.