That’s interesting. I’d actually be curious to know why this pops up during compilation and linking as that message is only supposed to be printed when libRooFitCore.so is loaded dynamically by an application.
(I’m a member of ATLAS so feel free to send something that requires ATLAS-specific knowledge to decode)
There is btw no way to switch this of in current releases, but I’ll add this to my to-do list for future releases.
In the latest RooFit release (v3.10, which shipped with the latest ROOT release 5.25/02) you can now disable the generation of these messages if you compile RooFit code with the flag -D__ROOFIT_NOBANNER.