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WIP keep PyYAML build working on Cython3.0.0a10+
fixes #601
- Cython 3.0 changes its build_ext command base class to one that's incompatible with pyyaml's subclass
- temporarily force use of Cython3's
old_build_ext
compatibility class if present
Alternative fix that works for both Cython versions: https://github.com/yaml/pyyaml/pull/729.
EDIT: Closed #729 in favor of #731. Please apply it to 5.4.1 release branch as well, since we need a fix there.
@nitzmahone: can you close this? #731 seems to implement basically the same thing without the explicit Cython version dependency. According to reports it works on pyyaml 5.4 and 6.0 branches. Thanks.
Hi @nitzmahone any update on this support, have we added this or is it still WIP.