[Distutils] command line versus python API for build system abstraction (was Re: build system abstraction PEP)

[Marcus Smith]

> Because even if we go with the entry-point-style Python
> hooks, the build frontends like pip will still want to spawn a child
> to do the actual calls -- this is important for isolating pip from the
> build backend and the build backend from pip, it's important because
> the build backend needs to execute in a different environment than pip
> itself, etc.

[...]
> Concretely, the way I imagine this would work is that pip would set up
> the build environment, and then it would run
>
>   build-environment/bin/python path/to/pip-worker-script.py <args>
>

fwiw, such a worker is what I was describing in an earlier thread with
Robert last work

https://mail.python.org/pipermail/distutils-sig/2015-October/027443.html

although I wasn't arguing for it in that context, but rather just using it
to be clear that a python api approach could still be used with build
environment isolation
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