Regression in devel branch mid november 2021

[traversaro]

It turns out that there was a compilation regression in #584, this was detected by robotology-superbuild Unstable branches CI (see https://github.com/robotology/robotology-superbuild/actions/runs/1483488415):

2021-11-20T03:09:48.1835184Z [61/106] Building CXX object plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorque.cc.o
2021-11-20T03:09:48.1836233Z FAILED: plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorque.cc.o 
2021-11-20T03:09:48.1851841Z /usr/share/miniconda3/envs/test/bin/x86_64-conda-linux-gnu-c++ -DBOOST_ALL_NO_LIB -DBOOST_DATE_TIME_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_IOSTREAMS_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_REGEX_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_TEST_DYN_LINK -DBOOST_THREAD_DYN_LINK -DLIBBULLET_VERSION=3.17 -DLIBBULLET_VERSION_GT_282 -Dgazebo_yarp_forcetorque_EXPORTS -I/home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/include/gazebo -I/home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/include/yarp/dev -I/home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/include -I/home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/libraries/common/include -I/home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/libraries/singleton/include -isystem /usr/share/miniconda3/envs/test/include/gazebo-11 -isystem /usr/share/miniconda3/envs/test/include/bullet -isystem /usr/share/miniconda3/envs/test/include/simbody -isystem /usr/share/miniconda3/envs/test/include/sdformat-9.3 -isystem /usr/share/miniconda3/envs/test/include/ignition/math6 -isystem /usr/share/miniconda3/envs/test/include/OGRE -isystem /usr/share/miniconda3/envs/test/include/OGRE/Bites -isystem /usr/share/miniconda3/envs/test/include/SDL2 -isystem /usr/share/miniconda3/envs/test/include/OGRE/HLMS -isystem /usr/share/miniconda3/envs/test/include/OGRE/MeshLodGenerator -isystem /usr/share/miniconda3/envs/test/include/OGRE/Overlay -isystem /usr/share/miniconda3/envs/test/include/OGRE/Paging -isystem /usr/share/miniconda3/envs/test/include/OGRE/Property -isystem /usr/share/miniconda3/envs/test/include/OGRE/RTShaderSystem -isystem /usr/share/miniconda3/envs/test/include/OGRE/Terrain -isystem /usr/share/miniconda3/envs/test/include/OGRE/Volume -isystem /usr/share/miniconda3/envs/test/include/ignition/transport8 -isystem /usr/share/miniconda3/envs/test/include/ignition/msgs5 -isystem /usr/share/miniconda3/envs/test/include/ignition/common3 -isystem /usr/share/miniconda3/envs/test/include/ignition/fuel_tools4 -isystem /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/include -isystem /usr/share/miniconda3/envs/test/include/eigen3 -isystem /usr/share/miniconda3/envs/test/include/sdformat-9.3/sdf/.. -isystem /usr/share/miniconda3/envs/test/include/ignition/cmake2 -isystem /usr/share/miniconda3/envs/test/include/uuid -isystem /usr/share/miniconda3/envs/test/include/opencv4 -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /usr/share/miniconda3/envs/test/include -O3 -DNDEBUG -fPIC -I/usr/share/miniconda3/envs/test/include/uuid -MD -MT plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorque.cc.o -MF plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorque.cc.o.d -o plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorque.cc.o -c /home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/src/ForceTorque.cc
2021-11-20T03:09:48.1946956Z /home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/src/ForceTorque.cc: In member function 'virtual void gazebo::GazeboYarpForceTorque::Load(gazebo::sensors::SensorPtr, sdf::v9::ElementPtr)':
2021-11-20T03:09:48.1949420Z /home/runner/work/robotology-superbuild/robotology-superbuild/src/GazeboYARPPlugins/plugins/forcetorque/src/ForceTorque.cc:120:50: error: 'driverList' was not declared in this scope; did you mean 'driver_list'?
2021-11-20T03:09:48.1951101Z   120 |         scopedDeviceName = m_sensorName + "::" + driverList[0]->key;
2021-11-20T03:09:48.1951667Z       |                                                  ^~~~~~~~~~
2021-11-20T03:09:48.1952057Z       |                                                  driver_list
2021-11-20T03:09:48.1952906Z [62/106] Building CXX object plugins/forcetorque/CMakeFiles/gazebo_yarp_forcetorque.dir/src/ForceTorqueDriver.cpp.o
2021-11-20T03:09:48.1954033Z [63/106] Building CXX object plugins/inertialmtb/CMakeFiles/gazebo_yarp_inertial.dir/src/inertialMTB.cc.o
2021-11-20T03:09:48.1954826Z ninja: build stopped: subcommand failed.

For some reason CI was disable in this repo, I enabled it again.

[traversaro]

fyi @GrmanRodriguez @Nicogene

[traversaro]

Fixed by #589 .