Project based on (Py)ROOT fails with loading `ROOT::v5::TFormula::GetExpFormula(char const*) const`

[VanyaBelyaev]

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Description

I have a project baed on ROOT/PyROOT.
I am using ROOT from LCG dev3 nighly slots on cvmfs.
And this week my project fails with:

cling::DynamicLibraryManager::loadLibrary(): /afs/cern.ch/user/i/ibelyaev/cmtuser/RELEASE/ostap/build/INSTALL/LCGdev3/x86_64-el9-clang19-opt/lib/libostap.so: undefined symbol: _ZNK4ROOT2v58TFormula13GetExpFormulaEPKc

The missing symbol correswponds to

$ c++filt _ZNK4ROOT2v58TFormula13GetExpFormulaEPKc
ROOT::v5::TFormula::GetExpFormula(char const*) const

I have no changes in my porject for more then a aweek.
The last successfun run was the last Thursday. Monday thjoisweek and today I see this problem.

Reproducer

I do not know if it is possible to make a simple reproducer - my project is rather large.

ROOT version

ROOT from cvmfs LCG dev3 nightly builds.
The problme appears somewhen between last Thursday (the last successful tet o fmy projects) and this Monday (where I saw the problem)

Installation method

cvmfs LCG dev3 nightly builds

Operating system

Linux

Additional context

The problme appears somewhen between last Thursday (the last successful tet o fmy projects) and this Monday (where I saw the problem)

[guitargeek]

Probably related to:

• [hist] allow specifying the floating point precision in GetExpFormula #18194

@ferdymercury, I think you need to revert the v5 part of your PR, as I mentioned in the comment to that PR.

[ferdymercury]

Sorry/Thanks, PR fixing this is open.

[VanyaBelyaev]

Dear @guitargeek @ferdymercury
Thank you very much for the prompt fix!

[dpiparo]

My bad, not seeing issues in our CI, I thought it was time to merge. Thanks everybody!

[pcanal]

Note that this error seems to indicates that:

 /afs/cern.ch/user/i/ibelyaev/cmtuser/RELEASE/ostap/build/INSTALL/LCGdev3/x86_64-el9-clang19-opt/lib/libostap.so

is not being properly rebuild when the ROOT header files changes. We reverted the PR as it was presenting other challenges but there is a likely underlying problem in your setup that may causes problem when other things change in ROOT.

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[VanyaBelyaev]

Note that this error seems to indicates that:

 /afs/cern.ch/user/i/ibelyaev/cmtuser/RELEASE/ostap/build/INSTALL/LCGdev3/x86_64-el9-clang19-opt/lib/libostap.so

is not being properly rebuild when the ROOT header files changes. We reverted the PR as it was presenting other challenges but there is a likely underlying problem in your setup that may causes problem when other things change in ROOT.

Dear @pcanal

It might be that you are right.
I am almost always, almost automaticlaly, on the level of human reflex, start my builds with rm -rf *.*,
but, since it is reflex-action, I cannot 100% guarantee that it was really done for these particular builds.

Anyhow, this morning ( with tm -rf *.*) using LCG dev3 nightllies I see no problems with my project.
Thanks to everybody!