roseus message generator make catkin_LIBRARIES empty on groovy

[garaemon]

It's a critical bug. This bug only related with groovy/catkin.

as mentioned in here jsk-ros-pkg/jsk_common#331, all the package which will be compiled after roseus will have empty ${catkin_LIBRARIES}.

Actually, in configuration time, ${catkin_LIBRARIES} is set correctly but in compilation time, target_link_libraries tries to link with no-library.

[garaemon]

diff between groovy and hydro:

diff /opt/ros/groovy/share/catkin/cmake/catkinConfig.cmake /opt/ros/hydro/share/catkin/cmake/catkinConfig.cmake 
84c84,91
<     list_append_unique(catkin_LIBRARIES ${${component}_LIBRARIES})
---
> 
>     # merge build configuration keywords with library names to correctly deduplicate
>     catkin_pack_libraries_with_build_configuration(catkin_LIBRARIES ${catkin_LIBRARIES})
>     catkin_pack_libraries_with_build_configuration(_libraries ${${component}_LIBRARIES})
>     list_append_deduplicate(catkin_LIBRARIES ${_libraries})
>     # undo build configuration keyword merging after deduplication
>     catkin_unpack_libraries_with_build_configuration(catkin_LIBRARIES ${catkin_LIBRARIES})
> 

[garaemon]

${catkin_LIBRARIES} will be empty after call generate_messages.
Consequently if we call find_package(catkin REQUIRED COMPONENTS ...) after generate_messages(), everything goes well.

[garaemon]

If we move the position of calling generate_messages, we can avoid this problem. this is just a hack.

garaemon/jsk_common@849fb5f

[k-okada]

#46 should fix this