Incorrect PYTHONPATH on gentoo

[Antagonistic]

Recently gone though the ROS from source install process for gentoo. Biggest issue I've hit (so far) is a pathing problem for the installed python scripts.

Running the command:

./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release --install-space=/opt/ros/hydro

installs the catkin (and actually all future) python scripts into:

/opt/ros/hydro/lib64/python2.7/site-packages

while _setup_util.py adds a path to:

lib/python2.7/site-packages

which results in a lot of python module not found errors.

Worked around in my case by running:

PYTHONPATH="/opt/ros/hydro/lib64/python2.7/site-packages/" ./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release --install-space=/opt/ros/hydro

As an aside, there are a lot of .so files being installed into /opt/ros/hydro/lib, including opencv, so this seems only a python installation issue.

[wjwwood]

Probably a similar to #604 and #545.

[wyc]

Narrowed down the issue to these two lines:
https://github.com/ros/catkin/blob/indigo-devel/python/catkin/builder.py#L273
https://github.com/ros/catkin/blob/indigo-devel/cmake/python.cmake#L35

There needs to be a platform-agnostic way of specifying lib vs. lib64. Could we use something like this in both scripts?

# gentoo
 $ python -c 'import site; print("/".join(site.getsitepackages()[0].split("/")[-3:]));'
lib64/python2.7/site-packages

# debian
$ python -c 'import site; print("/".join(site.getsitepackages()[0].split("/")[-3:]));'
lib/python2.7/dist-packages

The script would have to be Unix-only or amended to support windows too.

Thanks to @wjwwood for suggesting to ask Python.

[wyc]

Please see #636

[spaghetti-]

still a broken on current kinetic. I can verify that #636 works on Gentoo (Portage 2.2.28 (python 2.7.10-final-0, default/linux/amd64/13.0, gcc-4.9.3, glibc-2.22-r4, 4.4.6-gentoo x86_64)).

[dirk-thomas]

Since #636 has been closed I just want to mentioned the follow up PR #831 here.

[dirk-thomas]

Closing due to inactivity.

[allenh1]

For anyone looking here for this issue, you don't need to use catkin_make_isolated to build your setup because the ROS Overlay now has generated ebuilds for most packages (there's a few with dependency problems, but most of these are few in number).