I had heard once that due to the complexity of C++ there where only 2 or 3 unique C++ compilers in the world and that all other available compilers used one of those at its core. Is this true, and if so what are the "actual" C++ compilers.
To clarify: I'm specifically referring to the "core" of the compiler, I guess what you might call the "frontend". I'm definitely NOT referring to IDE's or "suites".
I did a quick search on C++ frontend vendor and came up with:
Clearly there are more than 3 C++ frontends, but I'd still like to know how many there are and to the extent possible which popularly available compilers use third party frontends.