Cannot install for current CPython HEAD / devel for macOS

[Kentzo]

See https://travis-ci.org/GreatFruitOmsk/nativeconfig/jobs/323100161 and https://travis-ci.org/GreatFruitOmsk/nativeconfig/jobs/323100162 for complete logs.

[ecederstrand]

Similar issue on Linux (gcc instead of clang): https://travis-ci.org/ecederstrand/exchangelib/jobs/333717892

[ecederstrand]

298e079 fixes this for me

[tacaswell]

The underlying issue is that the internals of cpython changed so the c code emitted by cython has changed (see cython/cython#1955 ) and the tarball on pypi has the pre-cythonized c code.

Re-cythonizing will also fix the problem, is there a way to do that when installing from pip install pyyaml?

[ssbarnea]

That should probably be closed

[tacaswell]

Does the sdist still include pre-cythonized output?

[ecederstrand]

@tacaswell For CPython HEAD, I just install from pyyaml HEAD: python -m pip install git+https://github.com/yaml/pyyaml.git. That installs via setup.py and runs the build_ext needed to cythonize. It's worked consistently in my CI pipeline the last four years.