Adding a class to root

ROOT
1

Hallo,

I wrote a class which uses ROOT libs and which I want to make a shared lib to use interactively in ROOT.

I compiled the class with

gcc -c -fPIC -pthread -m32 -I/usr/local/root/include Waveform.cpp

with no errors, and I create a shared lib with

gcc -shared -o libWaveform.so Waveform.o

which also gives no errors. The point is that when I try to load it with

gSystem->Load("libWaveform.so");

I get this:

dlopen error: libWaveform.so: undefined symbol: _ZN8TVectorTIdE4DrawEPKc Load Error: Failed to load Dynamic link library libWaveform.so

Any suggestion what could it be?
Waveform.cpp (8.2 KB)
WaveformLinkDef.h (57 Bytes)
Waveform.h (1.77 KB)

2

Hi,

your lib depends on libMatrix. You either need to load it before loading your library, or you need to tell the linker about the dependency: gcc -shared -o libWaveform.so Waveform.o -L$ROOTSYS/lib -lMatrix -lCore -lCint

Cheers, Axel.

3

Hi Axel,

thanks a lot. Anyway if I do as you say i got no error when using gcc but I got this error when I tried to load the library:

root [0] gSystem->Load("libWaveform.so"); dlopen error: libWaveform.so: undefined symbol: _ZTV8Waveform Load Error: Failed to load Dynamic link library libWaveform.so *** Interpreter error recovered ***

Cheers,
Andrea

4

Finally I fixed the problem: I did’t implement the destructor.

Thanks again,
Andrea