I think I&#x27;m the only person who&#x27;s written a complete C++ compiler by himself - preprocessor, parser, semantic analyzer, optimizer, and code generation. I also mean a C++98 compiler, because that&#x27;s pretty much where I stopped.<p>I don&#x27;t know how much is involved in going from that to C++14, as I haven&#x27;t done that.<p>10 man years is a good estimate for creating a C++ compiler, not including the C part nor the optimizer&#x2F;codegen.