> To clarify, Rust has its own ABI, just like C++ has its own ABI. And just like C++, you can expose a C ABI if you want by defining special functions. In C++, it's an `extern "C" { ... }` block, and in Rust, it's a `extern "C" fn foo() ...` function declaration.

Ohh, Now i got it. But its pretty good thing to have anyway. C ABI is the lingua franca anyway to communicate to any language, even C++.

> Adding C++ ABI support is a significant effort.

Ok. So if has its own ABI, im sure it would be a pretty hard undertaking to be compatible with C++.

I was guessing if maybe Rust had managed to squeeze and reuse the C++ ABI.. but sure, giving Rust is not that much alike C++ this would probably be a bad decision for small gains.

Thanks for clarifying.