Foxy OSX needs numpy

[sloretz]

See https://ci.ros2.org/job/test_ci_osx/315/console

--- stderr: rosidl_generator_py
11:32:17 Traceback (most recent call last):
11:32:17   File "<string>", line 1, in <module>
11:32:17 ModuleNotFoundError: No module named 'numpy'
11:32:17 CMake Error at cmake/rosidl_generator_py_generate_interfaces.cmake:213 (message):
11:32:17   
11:32:17   execute_process(/Users/osrf/jenkins-agent/workspace/test_ci_osx/venv/bin/python3
11:32:17   -c 'import numpy;print(numpy.get_include())') returned error code 1
11:32:17 Call Stack (most recent call first):
11:32:17   /Users/osrf/jenkins-agent/workspace/test_ci_osx/ws/install/ament_cmake_core/share/ament_cmake_core/cmake/core/ament_execute_extensions.cmake:48 (include)
11:32:17   /Users/osrf/jenkins-agent/workspace/test_ci_osx/ws/install/rosidl_cmake/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:286 (ament_execute_extensions)
11:32:17   CMakeLists.txt:48 (rosidl_generate_interfaces)

pip3 freeze shows mini2 has numpy installed, while mini1 does not. I think this went unnoticed because mini1 has been out of the farm for a while by missing a jenkins label.

[jacobperron]

I noticed that we are installing numpy in the binary instructions (also in Eloquent). Should we also make the same change for the Eloquent development setup instructions? cc/ @mjcarroll

[sloretz]

I noticed that we are installing numpy in the binary instructions (also in Eloquent). Should we also make the same change for the Eloquent development setup instructions? cc/ @mjcarroll

Maybe. I think this PR was opened in my confusion. It looks like numpy and PyQt5 weren't available on mini1 after I upgraded it because Homebrew has switched those to to use Python 3.8, but we're using Python 3.7. If numpy and PyQt5 work from PyPI then that allows us to use that until Homebrew finishes transitioning without having to worry about what python version is running.

[sloretz]

We currently recommend installing python3, PyQt5, sip, and numpy from homebrew, but PyQt5, sip, numpy on Homebrew depend on python@3.8. This is a problem because python/python3 on homebrew is Python 3.7.7, so all the packages depending on python@3.8 can't be used when using our instructions to brew install python3

This PR is trying to solve that by installing numpy, PyQt5 and sip from PyPI, but that runs into other issues. python_qt_binding imports the module sipconfig, but that module was deprecated and removed from versions of sip released to PyPI.

• ROS2 Fails to build qt_gui_cpp ros2#623 (comment)
• https://riverbankcomputing.com/pipermail/pyqt/2016-July/037729.html
• Sipconfig unsupported in sip5 - need to change FindSIP.py ros-visualization/rqt#211

I'm trying a different option now, which is to set python3.8 as the python3 version using these commands. I think this will work if the version of sip installed in homebrew still has the sipconfig module. Of course, python_qt_binding should be updated to support newer sip versions too.

brew unlink python
brew link --force python@3.8

[sloretz]

closing in favor of #663