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Document limitations of current implementation of PEP 518 in pip

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Pradyun Gedam 2018-04-17 23:10:17 +05:30
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@ -150,6 +150,8 @@ can be problematic. If this is the case, pip provides a
flag are responsible for ensuring the build environment is managed
appropriately.
.. _pep-518-limitations:
The current implementation of `PEP518`_ in pip requires that any dependencies
specified in ``pyproject.toml`` are available as wheels. This is a technical
limitation of the implementation - dependencies only available as source would
@ -158,6 +160,10 @@ dependency installation process. The potentially unbounded recursion involved
was not considered acceptable, and so installation of build dependencies from
source has been disabled until a safe resolution of this issue has been found.
Further, it also doesn't support the use of environment markers and extras,
only version specifiers are respected. Support for markers and extras will be
added in a future release.
.. _PEP517: http://www.python.org/dev/peps/pep-0517/
.. _PEP518: http://www.python.org/dev/peps/pep-0518/