Store codegen result for python code in build folder

[Flova]

Building a setup.py based setup results in code being generated in the source folder.

A cleaner approach would be probably to store this not in the src directory. This would also be more consistent with the way the cpp package is build.

Are there any non-obvious issues preventing this behavior?

[pac48]

Are you building with colcon and symlink-install? In that case, the generated code is symlinked to the src directory by colcon and I’m not sure if there is a way around that.