Additional dependencies needed for Python < 3.8

[jmroot]

I don't know if supporting these versions is even something you want to do, but I thought it should be noted somewhere that if you want to bootstrap on Python 3.7 or 3.6, you also need importlib-metadata and its dependencies.

[FFY00]

Which package pulls it? pypa/build does not actually need it if you pass --skip-dependency-check, exactly to support bootstrapping without it.

https://pypa-build.readthedocs.io/en/stable/installation.html#bootstrapping

[jmroot]

Which package pulls it?

pep517 https://github.com/pypa/pep517/blob/main/pyproject.toml#L14

[FFY00]

That is only used in pep517.meta, which is not needed by pypa/build anyway. Are you seeing any runtime failure?

https://github.com/pypa/pep517/search?q=importlib_metadata

[jmroot]

Hm, I thought I had, but now that I try again from scratch with 3.6, I don't. Never mind, sorry.

[FFY00]

No worries, I should still document this 😊

[jmroot]

Tracked it down, the issue was actually in build. PR submitted: pypa/build#401