ros melodic/gazebo9 package did not worked

[aeudes]

On fresh installation on 18.04 with Gazebo9 and ros melodic, the rotors packages are non functional:
when I try to launch any example, the mav did not take off. After investigation, I have find that gazebo complain that:

librotors_gazebo_interface_plugin.so cound not find libmav_msgs.so

The package ros-melodic-rotors-gazebo-plugin did not contain such library but it should as it is defined here :

rotors_simulator/rotors_gazebo_plugins/CMakeLists.txt

Lines 199 to 212 in 7e25747

	# Get lists of all .proto files in the msgs directory
	file(GLOB msgs msgs/*.proto)
	# Finally, generate the .cpp files from the .proto files
	PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS ${msgs})
	# Create a shared library of protobuf messages (.so extension on Linux platforms)
	add_library(mav_msgs SHARED ${PROTO_SRCS})
	target_link_libraries(mav_msgs ${PROTOBUF_LIBRARY} gazebo_msgs)
	# This causes mav_msgs to be linked with every created library in this file from this
	# point forward.
	# NOTE: This is deprecated, should be using target_link_libraries instead
	link_libraries(mav_msgs)

Please note that this lib is not related to the package mav_msg but is the shared linked library that contained protobuf definition for internal rotors messages.

This previous PR #506 shows the same problem and should correct this issue.

[tomcattiger1230]

Can you post the caktin build error msg. I think you may have another compile problems

[gsilano]

Hi all! As you can see from #506, I solved the problem (at least in my case). Please, take a look at my CrazyS and BebopS repositories.