Crash with visualiser on gcc6.3 due to ROOT LLVM error

[Laurie Nevay]

Seen before, but reported by Jochem. Only a problem with latest version of GCC I believe. Noting here for future.

Error in <UnknownClass::InitInterpreter()>: LLVM SYMBOLS ARE 
EXPOSED TO CLING! This will cause problems; please hide them 
or dlopen() them after the call to TROOT::InitInterpreter()!

• gcc 6.3

See for answer: https://root-forum.cern.ch/t/tfile-llvm-symbols-exposed/17816

"Don't link against 'Cling'"

[Laurie Nevay]

We aren't actively testing against GCC6 just now.

[Jochem Snuverink]

Some more info:

• This only happens when "firing a particle" in the visualiser.
• A workaround is to set --output=none

[Jochem Snuverink]

Note that gcc6 is not the latest and there is also already gcc7. Did someone check that this works correctly with an older version of gcc?