Undefined reference to 'typeinfo ...' in TTree

ROOT
1

Dear Colleagues,

I have a trouble with reading a TTree containing objects of class ‘particle_event’, which is my own class. The piece of code I’m using to read it looks as following:

gROOT->ProcessLine(".L particle_event.cxx+");

particle_event  *particle_events;

TFile *f = new TFile("threeRuns.el.root");
TTree *PicoTree = new TTree();
f->GetObject("PicoTree;1", PicoTree);

PicoTree->SetBranchAddress("particle_events",&particle_events); // <-- line producing linking error

// ....

The message from compiler is:

/tmp/ccJMDx7g.o: In function `int TTree::SetBranchAddress<particle_event>(char const*, particle_event**, TBranch**)':
/usr/cern/root/include/TTree.h:495: undefined reference to `typeinfo for particle_event'
/usr/cern/root/include/TTree.h:497: undefined reference to `typeinfo for particle_event'
collect2: ld returned 1 exit status

I’m using g++ 4.6.3 on Kubuntu 12.04. My makefile is shown below:

ALLSRC=selector.C Expr.cpp Logical.cpp Eq.cpp Lt.cpp Gt.cpp And.cpp Or.cpp Cut.cpp EventSelector.cpp
EXEC=selector
CXX=`root-config --cxx`
CXXFLAGS=`root-config --cflags`
LDFLAGS=`root-config --ldflags`
LDLIBS=`root-config --glibs`

$(EXEC): $(ALLSRC)
	$(CXX) $(CXXFLAGS) -W -Wall -g -o $@ $^ $(LDLIBS)

clean:
	rm -f $(EXEC) *.o

I must add that everything works fine if I’m using code produced by MakeSelector, the problem appears only when I want to compile “pure” C++ code.

Do you know what may be wrong here?

Kind regards,
Rafal

2

Hi,
I think that this erros is caused by virtual function i particle_event class that has been declared but not definded.
Cheers,
Daniel.

3

Hi,

thank you for your reply. Unfortunately, all functions are defined and none of them are virtual…

Regards,
Rafal

4

Try this … from your source code, remove the line:
gROOT->ProcessLine(".L particle_event.cxx+");
and use the following makefile: [code]ALLSRC=selector.C Expr.cpp Logical.cpp Eq.cpp Lt.cpp Gt.cpp And.cpp Or.cpp Cut.cpp EventSelector.cpp
EXEC=selector
CXX=root-config --cxx
CXXFLAGS=root-config --cflags
LDLIBS=root-config --glibs

$(EXEC): $(ALLSRC) particle_event.cxx
root -l -b -n -q particle_event.cxx++
$(CXX) $(CXXFLAGS) -W -Wall -g -o $@ $^ particle_event_cxx.so $(LDLIBS)

clean:
rm -f $(EXEC) *.o *.so[/code]