Flit Core apparently requires tomli at runtime rather than toml. This means
we must build a toml-less python-flit-core first, for bootstrapping purposes.
* gnu/packages/python-build.scm (python-flit-core-bootstrap): New variable.
(python-flit-core): Inherit from the above, replacing the propagated
python-toml by python-tomli.
(python-tomli): Adjust accordingly.
* gnu/packages/python-build.scm (python-pyparsing): Update to 3.0.6.
[properties]: Add a python2-variant property.
(python2-pyparsing): Inherit from the 2.4.7 variant, and strip the
python2-variant property.
This is in prevision of updating python-pypa-build, which now requires
python-packaging and adding python-tomli, which requires python-six.
* gnu/packages/python-xyz.scm (python-six)
(python-six-bootstrap, python2-six-bootstrap)
(python-pyparsing, python2-pyparsing, python-pyparsing-2.4.7)
(python-packaging-bootstrap, python2-packaging-bootstrap): Move packages to...
* gnu/packages/python-build.scm: ... here. Update python-parsing to latest.
* gnu/packages/python-xyz.scm (python-six, python-packaging): Adjust to
inherit from their bootstrap versions.
The build was failing following the addition of the sanity-check phase to the
Python buidl system.
* gnu/packages/python-build.scm (python-pypa-build)
[phases]{relax-requirements}: Add phase.
* gnu/packages/python-xyz.scm (python-pep517): Inherit from
python-pep517-bootstrap. Remove the inherited common fields.
(python-poetry-core, python-wheel)
(python-toml): Move to ...
* gnu/packages/python-build.scm: ... here, a new module.
(python-pep517-bootstrap): New package.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register the new module.
* gnu/packages/python-xyz.scm (python-pep517): Inherit from
python-pep517-bootstrap. Remove the inherited common fields.
(python-poetry-core, python-wheel)
(python-toml): Move to ...
* gnu/packages/python-build.scm: ... here, a new module.
(python-pep517-bootstrap): New package.
* gnu/local.mk (GNU_SYSTEM_MODULES): Register the new module.
