"Undefined reference to `TVersionCheck::TVersionCheck(int)' " error, when including Root header to GEANT4 program

ROOT
1

Dear Root & Geant4 experts

I am getting this error when trying to include root header to the Geant4 application. The Geant4 application works well otherwise. I did make sure that cmake is able to find the ROOTSYS. Also, when the root header is not included before Geant4 headers I get warnings of a conflict between the declaration of s in TString.h and CLHEP::SystemOfUnits.h . I have also tried checking with other versions of Root and Geant4.

_ROOT Version: 6.20.00 / 6.14.06
_Platform: Ubuntu 16.04
_Compiler: Cmake 3.16.4 , Geant4.10.05 / Geant4.10.06.p01

2

The error in the title indicates that you are not linking against the ROOT libraries (libCore in particular)

3

This fixed it. Thank you again.

4

Can you please tell me how the indicated error meant libCore was not linked? I mean is there any reference from where I can understand which libraries are not linked from the error message?

5

In principle through the documentation of TVersionCheck which should tell you which library to link. That’s broken, I’m working on the fix!