Llvm symbols are exposed to cling!

Hello,
I have the very same problem as reported initially by ruolin, viz.:
LLVM SYMBOLS ARE EXPOSED TO CLING!
With about the same context: Ubuntu,v16.04/ROOT,v6.12 in a GEANT4-based executable, w/ OpenGL for graphics.

And my executable is not linked against libCling.

I could see that the subject was already discussed, 2 years ago, in the root-forum, see:

But there no working solution is proposed, apart from a workaround suggested by the author of the ticket himself, viz.: calling gROOT->GetInterpreter() before the initialization of the OpenGL view. That does not work around in my case.

Then, would anybody know of a solution?
Yann Bedfer