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Sachi King 11ffee94fa Do not silently drop markers that fail to evaluate

We are silently dropping requirements that do not parse, do not do this
and bubble the error up.

Change-Id: I5bfce7c7d0be2ccd880e78509856074a09c57166
Closes-Bug: 1554331

2016-03-09 11:26:43 +11:00

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Compatibility Notes

Useful notes about errors users may encounter when features cannot be supported on older versions of setuptools / pip / wheel.

setuptools

evaluate_marker

evaluate_markers may run into issues with the '>', '>=', '<', and '<=' operators if the installed version of setuptools is less than 17.1. Projects using these operators with markers should specify a minimum version of 17.1 for setuptools.

pip

markers

For versions of pip < 7 with pbr < 1.9, dependencies that use markers will not be installed. Projects using pbr and markers should set a minimum version of 1.9 for pbr.

Recommended setup.py

setup_py.

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