> On Jul 16, 2018, at 5:22 AM, Paul Moore <p.f.mo...@gmail.com> wrote:
>
> 1. If [build-system] is present but requires is missing, raise an error.
> 2. If [build-system] is missing, they can take one of the following
> two approaches:
> a) Act as if pyproject.toml is missing altogether
> b) Act as if [build-system] is present, with a requires value of
> ["setuptools", "wheel"]
>
> Whether tools act differently in cases 2a and 2b is tool-dependent
> (for pip, we would isolate in case 2b but not in case 2a) which is why
> the choice is left to individual tools. That makes the
> "Thomas/Nathaniel" debate into a tool implementation choice, and both
> of the options are allowable from the perspective of the PEP.
This sounds fine to me, and I prefer a 2b approach.
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