Test building PyPy wheel on CI

[messense]

Part of #115

[messense]

Odd, it works on linux and Windows but fails to import on macOS.

Traceback:
../../../hostedtoolcache/PyPy/3.7.10/x64/lib-python/3/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test-crates/pyo3-mixed-submodule/tests/test_pyo3_mixed_submodule.py:3: in <module>
    import pyo3_mixed_submodule
../../../hostedtoolcache/PyPy/3.7.10/x64/site-packages/pyo3_mixed_submodule/__init__.py:2: in <module>
    from .rust_module.rust import get_21
E   ImportError: dlopen(/Users/runner/hostedtoolcache/PyPy/3.7.10/x64/site-packages/pyo3_mixed_submodule/rust_module/rust.pypy37-pp73-darwin.so, 6): Symbol not found: _PyExc_AttributeError
E     Referenced from: /Users/runner/hostedtoolcache/PyPy/3.7.10/x64/site-packages/pyo3_mixed_submodule/rust_module/rust.pypy37-pp73-darwin.so
E     Expected in: flat namespace
E    in /Users/runner/hostedtoolcache/PyPy/3.7.10/x64/site-packages/pyo3_mixed_submodule/rust_module/rust.pypy37-pp73-darwin.so

@davidhewitt Any insight?

[davidhewitt]

I think that looks like the sort of error to expect if PyO3 configured itself against CPython but the wheel is being imported by PyPy... 🤔

[messense]

Right.

on Windows it passes --cfg Py_3_6 --cfg Py_3_7 --cfg PyPy --cfg "py_sys_config=\"WITH_THREAD\"" --cfg min_const_generics --cfg addr_of
on macOS it passes --cfg Py_3_6 --cfg Py_3_7 --cfg Py_3_8 --cfg 'py_sys_config="WITH_THREAD"' --cfg min_const_generics --cfg addr_of which misses the --cfg PyPy argument.