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System V is only a C ABI, not a C++ ABI, so of course it wouldn't cover C++-only details. What C++ ABI does MinGW use on Windows?

• Const-me 5y ago
  That thing is COM, which is a small subset of C++ ABI. Technically it’s about the same as on Windows, i.e. C ABI with extra first argument for this pointer. Once upon a time I made this library https://github.com/const-me/comlightInterop/ https://github.com/const-me/comlightInterop/ The native side of the interop is idiomatic C++, here’s an example https://github.com/Const-me/ComLightInterop/blob/master/Demos/HelloWorldCpp/HelloWorld.cpp https://github.com/Const-me/ComLightInterop/blob/master/Demo... The C# side of the interop is implemented through the built-in C interop, here’s the relevant part of the library https://github.com/Const-me/ComLightInterop/blob/master/ComLight/Emit/NativeDelegates.cs#L39-L128 https://github.com/Const-me/ComLightInterop/blob/master/ComL... I’ve tested Linux version of that library on AMD64, ARMv7, and ARM64 CPUs, but only with gcc compiler on the native side.