stub file error when --hpy-abi=universal about hpy HOT 4 CLOSED

My 2 cents: there is a discussion to depreciate distutils (https://www.python.org/dev/peps/pep-0632/). Now that we have pep517 and isolated builds with pyproject.toml, supporting builds using hpy with only distutils doesn't seem to be very useful.

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I pushed a small fix to https://github.com/hpyproject/ultrajson-hpy/tree/antocuni/update-to-latest-hpy.

The high-level issue is that ultrajson-hpy's setup.py was passing the distutils version of build_ext rather than the setuptools one.

The question now is what to do about it on the HPy side? It's likely a common and confusing issue, so we should do something.

One option is to try detect the issue and either raise an error or warning. One way to detect the issue is to check whether the setuptools build_ext is somewhere in the inheritance hierarchy of the current build_ext. If it isn't, the build will probably fail anyway.

Another option is to somehow handle the case where only distutils is being used, but I don't really know what that should look like, other than that it would probably be even more of a mess.

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One option is to try detect the issue and either raise an error or warning. One way to detect the issue is to check whether the setuptools build_ext is somewhere in the inheritance hierarchy of the current build_ext. If it isn't, the build will probably fail anyway.
Another option is to somehow handle the case where only distutils is being used, but I don't really know what that should look like, other than that it would probably be even more of a mess.

I don't know enough on the subject to make a reasonable comment. I am fine with both options if they improve the current situation.

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Addressed by #178.

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