Dear experts, I am running ROOT 6.17/01 on MacOS Sierra v10.12.6. I am attempting to compile a .cpp file (attached) which encodes a custom fit-shape. But ROOT throws the following error: Undefined symbols for architecture x86_64: “ROOT::Math::cyl_bessel_k(double, double)”, referenced from: BK2(d…

You should have NO errors from doing: .L RooHypatia2.cpp++ Try with an additional step: root [0] gSystem->Load("libMathMore") root [1] .L RooHypatia2.cpp++

Try: root [0] .L RooHypatia2.cpp++ Note: if you build a shared library or a standalone application, you will need to add “-lMathMore” to your linking command line.

Thanks for replying. .L RooHypatia2.cpp++ is how I was compiling the file initially. Can you please tell me how to add -lMathMore to my linking command line? Thanks, Arvind.

Unfortunately, I do. Undefined symbols for architecture x86_64: “ROOT::Math::cyl_bessel_k(double, double)”, referenced from: BK2(double, double) in RooHypatia2_cpp_ACLiC_dict.o LnBK2(double, double) in RooHypatia2_cpp_ACLiC_dict.o ld: symbol(s) not found for architecture x86_64 clang: error: l…

YES! That worked. When I explicitly load libMathMore using gSystem, then there are no complaints. Thank you so much!!

And yes, root-config --has-mathmore returns yes. Thanks a ton Wile E.!

@axel It seems that Linux automatically loads libMathMore while MacOS does not.

ROOT cannot autoload based on functions (fixed for ROOT’s modules build!). For Linux, some side-effect triggers the loading on time. I recommend putting R__LOAD_LIBRARY(libMathMore) into RooHypatia2.cpp, below the #includes - that should do!

@axel Have you fixed it yet? [image] gSystem->Load() Vs. R__LOAD_LIBRARY with ACLiC ROOT Actually, I also expected ACLiC (via “rootcling” / “rootcint”, which are automatically executed) to respect “R__LOAD_LIBRARY”, “R__ADD_INCLUDE_PATH” and “R__ADD_LIBRARY_PATH” macros. A…

Dammit - did I fall into the same trap again? :frowning: That’s now https://sft.its.cern.ch/jira/browse/ROOT-10104

Undefined symbols for architecture x86_64

Roofit and RooStats

Wile_E_Coyote May 7, 2019, 9:20am 11

@axel Have you fixed it yet?