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Well, if you're fine with not being up to date in terms of C++ standards there is also the OpenWatcom C/C++ compiler[0]. Jiří Malák (the main v2 dev) is doing a herculean job maintaining and improving it.

[0] https://github.com/open-watcom/open-watcom-v2

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I'm not sure Watcom is C++98 compliant, let alone C++11 or newer

(and I'm implicitly using C++11 here when I say "C++", given that it effectively defines 'modern' C++).

According to some older comment by jmalak, it is compatible with C++98/C++03 with some C++11 features though, yes, it isn't C++11 compatible (there are some stubs for C++11 that i can see in the code but nothing implemented).

And that's a thing though, SFINAE hinted at it but more recent versions of C++ constexpr and consteval together with relaxed constexpr and "if constexpr" and "if consteval" together with compile-time dynamic typing forced the compiler to more or less include an interpreter in the frontend.

Adding some features of C++11 isn't close to building a C++ compiler capable of 11, 14, let alone 17, 20, 23 or 26.

If you can rip out a compliant parser, it might even be better to start over on a new compiler frontend if your current compiler frontend is targeting at pre-11 level.

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