usbCameraRaw YARP device is not installed correctly in Linux

[traversaro]

Describe the bug
The usbCameraRaw plugin installed by the YARP option ENABLE_yarpmod_usbCamera does not work correctly, and it is not shown correctly by the yarpdev --list .

To Reproduce
Install YARP and enable the usbCamera device. Then, run yarpdev --list, you get:

 [INFO] |yarp.dev.Drivers| Here are devices listed for your system:
Error:  |yarp.os.YarpPluginSettings| Error while opening /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so:
  /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so: undefined symbol: usbCameraRaw
Error:  |yarp.os.YarpPluginSettings| Error while opening /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so:
  /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so: undefined symbol: usbCameraRaw
Error:  |yarp.os.YarpPluginSettings| Error while opening /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so:
  /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so: undefined symbol: usbCameraRaw
Error:  |yarp.os.YarpPluginSettings| Error while opening /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so:
  /home/runner/work/robotology-superbuild/robotology-superbuild/build/install/lib/yarp/yarp_usbCamera.so: undefined symbol: usbCameraRaw
Warning:  |yarp.dev.Drivers| Wrong library name for plugin usbCameraRaw

Expected behavior
I would expect yarpdev --list to work correctly as it does for all the other YARP devices.

Screenshots

Configuration (please complete the following information):

• OS: Ubuntu 20.04
• yarp version: both 3.4.0, 3.4 branch and master
• compiler: GCC 9.3

Additional context
I discovered this in https://github.com/robotology/robotology-superbuild/pull/521/checks?check_run_id=1425069998 .

Similar issues:

• Unable to load the yarp devices built by wearables in Windows wearables#91

[drdanz]

Did you enable also ENABLE_yarpmod_usbCameraRaw? I don't know the difference, but they are two different plugins in the same library

[traversaro]

I added it in robotology/robotology-superbuild@7b9367a, let's see if it fixes the issue.

[traversaro]

Indeed, enabling ENABLE_yarpmod_usbCameraRaw everything works as expected. I guess it is a bit counter intuitive that if you enable ENABLE_yarpmod_usbCamera and not ENABLE_yarpmod_usbCameraRaw you get a non-working usbCameraRaw installed, but for sure that is another problem.