Circular exec dependency causes catkin_tools to hang

[mikepurvis]

When I have a workspace with a circular build_depend, and I attempt to catkin build it, I get the expected behaviour:

[build] Found '2' packages in 0.0 seconds.                                                                           
[build] Error: The workspace packages have a circular dependency, and cannot be built. Please run `catkin list --deps` to determine the problematic package(s).

However, when my workspace has a circular exec_depend, the build step simply hangs:

[build] Found '2' packages in 0.0 seconds.                                                                           
[build] Updating package table.                                                                                      

This is with catkin_tools 0.4.4.

Minimum working example: https://github.com/mikepurvis/catkin_tools_439

[wjwwood]

Duplicate of #429?

[mikepurvis]

Oh blah, so it is.