Force config. regeneration when adding new params

[corot]

When adding new params to https://github.com/magazino/move_base_flex/blob/master/mbf_abstract_nav/src/mbf_abstract_nav/__init__.py, you need to touch https://github.com/magazino/move_base_flex/blob/master/mbf_costmap_nav/cfg/MoveBaseFlex.cfg before compiling so code for the new parameters is generated.

Cannot do better?

[corot]

One ugly option is to always touch the .cfg file, but this makes compilation longer when only it's occasionally needed:

• file(TOUCH_NOCREATE cfg/MoveBaseFlex.cfg) requires CMake 3.12
  or
• execute_process(COMMAND touch cfg/MoveBaseFlex.cfg)

[jspricke]

You would need to add the file as a dependency to the add_custom_command in the generate_dynamic_reconfigure_options macro, i.e. here:
https://github.com/ros/dynamic_reconfigure/blob/melodic-devel/cmake/dynamic_reconfigure-macros.cmake#L73
Maybe an extra parameter in for the macro works.
I didn't find a way to inject the dependency later.

[corot]

Maybe an extra parameter in for the macro works.

Unfortunately not; generate_dynamic_reconfigure_options tries to process it as any other .cfg file

[jspricke]

> Maybe an extra parameter in for the macro works. Unfortunately not; generate_dynamic_reconfigure_options tries to process it as any other .cfg file

I meant you can improve the generate_dynamic_reconfigure_options (i.e. patch it), such that it supports your use case.

[corot]

Change PRequested. @jspricke, maybe you can comment it, if it's not described clearly enough.