[navmap_rviz_plugin] Compilation error when Qt6 is present #8
Description
When building in rolling with an updated Ubuntu 24.04 machine, I am getting the following error:
--- stderr: navmap_rviz_plugin
CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Qt6Core/Qt6CoreVersionlessTargets.cmake:42 (message):
Some (but not all) targets in this export set were already defined.
Targets Defined: Qt::Core
Targets not yet defined: Qt::CorePrivate
Call Stack (most recent call first):
/usr/lib/x86_64-linux-gnu/cmake/Qt6Core/Qt6CoreConfig.cmake:65 (include)
/usr/share/cmake-3.28/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
/usr/lib/x86_64-linux-gnu/cmake/Qt6/QtPublicDependencyHelpers.cmake:108 (find_dependency)
/usr/lib/x86_64-linux-gnu/cmake/Qt6Widgets/Qt6WidgetsDependencies.cmake:39 (_qt_internal_find_qt_dependencies)
/usr/lib/x86_64-linux-gnu/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake:50 (include)
/usr/lib/x86_64-linux-gnu/cmake/Qt6/Qt6Config.cmake:167 (find_package)
/opt/ros/rolling/share/rviz_common/cmake/rviz_common-extras.cmake:34 (find_package)
/opt/ros/rolling/share/rviz_common/cmake/rviz_commonConfig.cmake:41 (include)
CMakeLists.txt:11 (find_package)
I have both Qt5 and Qt6 installed, but it looks like rviz_common is finding Qt6, which conflicts with the find_package(Qt5 ...) in the plugin's CMakeLists.txt.
I think this is related to ros-navigation/navigation2#5570 and ros2/rviz#1187. I tried to apply the same fix as in nav2, but was unable to make it work.
I was able to replicate this in one of my computers and inside a docker container. However, I have another machine with Ubuntu 24.04 where it builds fine (same library versions)...