How is the Boost/PyPy integration? Sure, there's cpyext, so in principle a Boost-generated extension can be used by pypy.

Are there any changes which would make Boost-based extensions better integrated/supported by PyPy?

The linked-to document only talks about Cython and cffi.

There is cppyy, which is cffi for c++. Boost python is not being maintained, in the cpython world pybind11 is more popular but cppyy is pypy freindly

Boost isn't being maintained? I did not know that. One of the project I use often - F/OSS but I'm a user, not core developer - uses Boost for C++/Python integration. They chose it many years ago. This topic has never come up on the mailing list or user group meetings. I suspect that since Boost "just works", no one has care to re-evaluate that decision.

Thanks for the pointers to what's going on in the C++/python integration layer. I'll experiment with it.