[issue8357] Add a --show-installation-paths in the install command

[Tim Kersten]

Tim Kersten <tim.kersten at lincor.com> added the comment:

Such an option would be useful indeed.

An idea, though perhaps it's overkill, would be to show the current values of the options causing problems, specifically if they come from a config file or environment variable.

i.e. when setup.cfg contains home=/somewhere

$ python setup.py install --prefix=/tmp
running install
error: must supply either home or prefix/exec-prefix -- not both
       setup.cfg: home=/somewhere

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