Compliance with PEP 518

[marcofavorito]

Is your feature request related to a problem? Please describe.

The project is not compliant with PEP 518

Describe the solution you'd like

Being compliant. That is, specifying the pyproject.toml file to store the build system dependencies.

Describe alternatives you've considered
N/A

Additional context
N/A

[marcofavorito]

Given that:

• we are using setuptools as the build system
• the support of pyproject.toml specification for setuptools is under discussion: Discussion: support for pyproject.toml configuration pypa/setuptools#1688

I see two alternatives:

• leave everything as it is now
• change the build system (e.g. poetry)

[DavidMinarsch]

Ok thanks, so leave everything as is for now.

[sinoroc]

For info, I believe a pyproject.toml file like the following should be enough to make a setuptools-based project comply with PEP518:

[build-system]
requires = ['setuptools']
build_backend = 'setuptools.build_meta'

without having to make changes to the setup.py and setup.cfg files.

Example: https://github.com/pypa/setuptools/blob/c0154f47121ca107095eb52ca1462c23b7457045/pyproject.toml