For C++, there are exactly four independent frontends in wide use (gcc, clang, msvc, edg) and three independent stdlibs (libstdc++, libc++, STL). I’m not sure

For C++, there are exactly four independent frontends in wide use (gcc, clang, msvc, edg) and three independent stdlibs (libstdc++, libc++, STL). I’m not sure how many independent compiler backends are widely used with those frontends and stdlibs.