[gentoo-user] Dependencies and PYTHON_TARGETS

[Ian Zimmerman]

I am still on the 2013 profile, and I therefore have
PYTHON_TARGETS=python2_7 python3_5.

The other day I had to install python 3.6 for reasons unrelated to
portage or other packages.  I thought I would reduce my overall snake
footprint by removing 3.5 _if_ it wasn't really necessary anymore.  To
that end, I removed the line

dev-lang/python:3.5

from /etc/portage/world, and then I did emerge --depclean.  I was
somewhat surprised when portage charged ahead and removed python 3.5,
but I said ok maybe it automatically changed the TARGETS of the
dependencies and they will be rebuilt next time.  But _no_, checks with
equery and emerge -p show that all python code providing packages still
have python_targets_python3_5 on, and python_targets_python3_6 off.

This is disappointing.  It looks like I have to do 2 things manually:

* set PYTHON_TARGETS="python2_7 python3_6" - where?  In make.conf?  Will
  it override the profile setting?

* make sure dev-lang/python:3.6 stays in the world file, even if it is
  not needed by me directly

Or I am badly confused as I often am ;-)

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