Compilation error with ROOT.jl-generator and added classes

[achjaj]

Hi,

I'm trying to add TGraph2D and TGraph2DErrors classes to my ROOT.jl using ROOT.jl-generator. I added the coresponding header files to ROOT.wit.in and tried to generate and compile ROOT.jl using the genandbuild.sh script. Unfortunately I got this error:

Failed to precompile ROOT [1706fdcc-8426-44f1-a283-5be479e9517c] to "$HOME/.julia/compiled/v1.11/ROOT/jl_rpYWce".
C++ exception while wrapping module ROOT: No appropriate factory for type 11TTreeReader
ERROR: LoadError: No appropriate factory for type 11TTreeReader

I tried the compilation without the added header files and I also tried different ROOT versions, but nothing helped.
My current setup is:

• Julia 1.11.3 (2025-01-21)
• ROOT 6.30/04 (Built for linuxx8664gcc on Apr 28 2024, 20:44:39)

[grasph]

Hello @achjaj,

I am able to reproduce the problem but I've not understood yet the cause. I expect it is link to wrapit or LLVM version.

If you need TGraph2D and TGraph2DErrors, then you can use the -moreclasses branch of ROOT.jl that already includes these classes. You will need release 6.32.02 of ROOT that you should install yourself (or use cvmfs installation if you have access to cvmfs) . Indeed, the automatic installation will pick up an incompatible version following to an update of the Conda forge repository, and the code building will fail.

source ROOTSYS_OF_ROOT_6.32.02/bin/thisroot.sh
julia
]
pkg> add https://github.com/JuliaHEP/ROOT.jl#v0.3.3-moreclasses
pkg> build -v

Note, that we should have soon a ROOT.jl release that uses prebuilt Julia binary packages (_jll) for the ROOT and wrapper shared libraries, at least for Linux. That will ease the installation, avoid release compatibility issues we have with Conda, and ROOT.jl release will come by default with all the classes included in the -moreclasses branch.

Philippe.

[achjaj]

Hello,

thank you for your help. I also need TList class which is not included in the branch, but I was able to resolve the issue by removing TTreeReader from ROOT.wit.in file.