[Distutils] string types for paths in PEP 517

[Donald Stufft]

> 
> On Sep 5, 2017, at 4:36 AM, Nathaniel Smith <njs at pobox.com> wrote:
> 
> Does pip in fact use /tmp for temporary directories? (It's not always
> the right choice, because /tmp has limited space on some systems, e.g.
> b/c it's on a ramdisk. If we still had build_directory= then this
> could be an issue, since build directories can be arbitrarily large;
> maybe it's not a big deal now that we only need the tmpdir to handle a
> single sdist/wheel/dist-info.)


It does by default yes. It just uses the tempfile module so it respects $TMPDIR directory and everything if people want to point it to a different directory.