ROOT-based Qt applicataion on lxplus

ROOT
1

Hello,

I’m writing GUI. On my local computer with CERN SL4 linux and Qt 3.3 everything goes fine. But some of my collaborators want to use it on lxplus. And there I cannot link the project. The problem is the same like if you copy&paste HelloCanvas.cxx and HelloCanvas.pro from page 413, chapter 27 of User’s guide. qmake phase finishes OK, compilation as well but linking fails with

/afs/cern.ch/sw/lcg/external/root/5.13.02/slc3_ia32_gcc323_dbg/root/lib/libGQt.so: undefined reference to `QWidget::repaint(bool)'

Could you please give me an advice? Thank you in advance,

Kašpi.

2

Hi Kašpi,

I was able to execute the HelloCanvas.cxx example with no problem. ~/root/tutorials > qmake HelloCanvas.pro ~/root/tutorials > make HelloCanvas g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -DQT_SHARED -DQT_THREAD_SUPPORT -I/afs/cern.ch/sw/lcg/external/qt/3.3.4/slc3_gcc323/mkspecs/default -I. -I. -I"/afs/cern.ch/sw/lcg/external/root/5.13.02/slc3_ia32_gcc323_dbg/root/include" -I/afs/cern.ch/sw/lcg/external/qt/3.3.4/slc3_gcc323/include -o HelloCanvas.o HelloCanvas.cxx g++ -o HelloCanvas HelloCanvas.o -Wl,-rpath,/afs/cern.ch/sw/lcg/external/qt/3.3.4/slc3_gcc323/lib -L/afs/cern.ch/sw/lcg/external/qt/3.3.4/slc3_gcc323/lib -L/usr/X11R6/lib -L/afs/cern.ch/sw/lcg/external/root/5.13.02/slc3_ia32_gcc323_dbg/root/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lGui -pthread -lm -ldl -rdynamic -lTable -lGQt -lqt-mt -lXext -lX11 -lm ~/root/tutorials > HelloCanvas I should say that my environment is SLC3, not SLC4.
Cheers, Ilka

3

Thanks very much. I changed my QTDIR to that one you use and it’s OK now.

Kašpi.

4

Hi Kašpi,

You are welcome - I am glad that the problem is solved. I am adding the settings I have used:setenv ROOTSYS /afs/cern.ch/sw/lcg/external/root/5.13.02/slc3_ia32_gcc323_dbg/root setenv QTDIR /afs/cern.ch/sw/lcg/external/qt/3.3.4/slc3_gcc323 setenv LD_LIBRARY_PATH .:$ROOTSYS/lib:$QTDIR/libCheers, Ilka