Exporting a C API from a C++ project to consume in another C++ project is really painful. This is how you get COM.

(which actually slightly pre-dates C++, I think?)

> This is how you get COM. (which actually slightly pre-dates C++, I think?)

No. C++ is from 1985 (https://en.wikipedia.org/wiki/C%2B%2B), COM from 1993 (https://en.wikipedia.org/wiki/Component_Object_Model)

COM is actually good though. Or if you want another object system, you can go with GObject, which works fine with Rust, C-+, Python, JavaScript, and tons of other things.

OWL, MFC, Qt, VCL, FireMonkey, AppFramework, PowerPlant...

Plenty do not, especially on Apple and Microsoft platforms because they always favoured other approaches to bare bones UNIX support on their dynamic linkers, and C++ compilers.