the standard itanium C++ ABI (the one used by gcc) covers the entire C++ language.

Except for templates. They are not a part of ABI, and most of the C++ libraries can't be used without C++ headers.

I wouldn't try supporting all templates, but there are lots of big C++ libraries that use templates fairly minimally. Qt, Unreal Engine, even things like COM on Windows.... not to mention that many large internal codebases primarily use classes, pointers and perhaps a handful of STL classes.

I'd dare not to say that about Qt, taking into account that all Qt container classes are templates.

OK, I admit my Qt knowledge is about 10 years out of date 🙂 It used to provide things like QString itself and didn't use templates much. But OK, do as you wish 🙂 I bet if you guys put your minds to it, you can make a lot more progress on this than you'd imagine.

Sure. My background is also somewhat "tainted" - for some reason I keep thinking that if you can't consume 120% of the existing code, that's no class 🙂