Derived class from HlmsComputeJob with implicit destructor compile errors.

Linux, gcc7.2.

With python-ogre the build fails with the wrapper code for HlmsComputeJob.

From the header the class is declared as "class _OgreExport HlmsComputeJob : PassAlloc ......" . If I update the declaration to ""class _OgreExport HlmsComputeJob : public PassAlloc ......" the problem goes away.

Is this a typo or is there a reason behind this?

This is a simple example in