I am trying to write a package using Qt4 and ROOT. I have some minimal Qt4 code that compiles and runs. It does not yet include any ROOT stuff. If I compile this code with -lQtGSI, I get an error message:
when I try to run the executable. (Note that libqt-mt.so.3 is a Qt3 library.) The error message goes away if I append the Qt3 library to LD_LIBRARY_PATH, but then the program crashes.
I am linking against /afs/cern.ch/sw/lcg/app/releases/ROOT/5.22.00/slc4_ia32_gcc34/root/lib/libQtGSI.so. I have confirmed with ldd that the executable compiled with -lQtGSI depends on libqt-mt.so.3, and that the executable compiled without -lQtGSI does not depend on libqt-mt.so.3.
It has been posted that ROOT versions higher than 5.21.06 support only Qt4. The problem I am experiencing suggests that there may still be some dependence on Qt3. I would appreciate it if someone could check this.
That’s weird… I’ll check and let you know.
Edited:
Looking at the make log, it seems to be the right configuration (Qt4.4.2):
g++ -shared -Wl,-soname,libQtGSI.so -m32 -O2 -o lib/libQtGSI.so gui/qtgsi/src/TQApplication.o gui/qtgsi/src/TQCanvasImp.o gui/qtgsi/src/TQCanvasMenu.o gui/qtgsi/src/TQRootApplication.o gui/qtgsi/src/TQRootCanvas.o gui/qtgsi/src/TQRootDialog.o gui/qtgsi/src/TQRootGuiFactory.o gui/qtgsi/src/G__QtGSI.o gui/qtgsi/src/moc_TQCanvasMenu.o gui/qtgsi/src/moc_TQRootApplication.o gui/qtgsi/src/moc_TQRootCanvas.o gui/qtgsi/src/moc_TQRootDialog.o -Llib -lGui -lGpad -L/afs/cern.ch/sw/lcg/external/qt/4.4.2/slc4_ia32_gcc34/lib -lQtCore -lQtGui -lQt3Support -lQtOpenGL -lQtSvg -lQtXml -Llib -lCore -lCint
I’ll give it a try it next week (I will be away until then)
[quote=“hulya”][quote]…/i686-slc4-gcc34-dbg/trp: error while loading shared libraries: libqt-mt.so.3: cannot open shared object file: No such file or directory[/quote]. . .
I am linking against /afs/cern.ch/sw/lcg/app/releases/ROOT/5.22.00/slc4_ia32_gcc34/root/lib/libQtGSI.so. I have confirmed with ldd that the executable compiled with -lQtGSI depends on libqt-mt.so.3, and that the executable compiled without -lQtGSI does not depend on libqt-mt.so.3. [/quote] libQtGSI.so library is Qt4-based library:
ldd /afs/cern.ch/sw/lcg/app/releases/ROOT/5.22.00/slc4_ia32_gcc34/root/lib/libQtGSI.so
linux-gate.so.1 => (0xffffe000)
libGui.so => not found
libGpad.so => not found
libQtCore.so.4 => not found
libQtGui.so.4 => not found
libQt3Support.so.4 => not found
libQtOpenGL.so.4 => not found
libQtSvg.so.4 => not found
libQtXml.so.4 => not found
libCore.so => not found
libCint.so => not found
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xf7eca000)
libm.so.6 => /lib/tls/libm.so.6 (0xf7ea7000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xf7e9d000)
libc.so.6 => /lib/tls/libc.so.6 (0xf7d6e000)
/lib/ld-linux.so.2 (0x56555000)
It has no Qt3 dependency. Can you show how you built your application? I suspect there were Qt3 utilities on your PATH and your build process used some of them
Thank you very much for your help. The problem was indeed with LD_LIBRARY_PATH. The program needs to use the ATLAS TDAQ paths, and one of the essential directories in this path includes links to older ROOT libraries (version 5.18.00f).
there were Qt3 utilities on 
PATH and your build process used some of them