Hello all! I have a problem using or understanding the behaviour of GCC linker. While building a Qt-based application I get a following error: $ /home/user/bbndk-2.0.0/host/linux/x86/usr/bin/arm-unknown-nto-qnx6.5.0eabi-g++ -Wl,-rpath-link,/home/user/bbndk-2.0.0/target/qnx6/armle-v7/lib -Wl,-rpath-link,/home/user/bbndk-2.0.0/target/qnx6/armle-v7/usr/lib -Wl,-O1 -Wl,-rpath,/home/user/workspace/playbook_prefix/peregrine/lib -o peregrine-tablet-common main.o KeyboardHandler.o -L/home/user/bbndk-2.0.0/target/qnx6/armle-v7/lib -L/home/user/bbndk-2.0.0/target/qnx6/armle-v7/usr/lib -L/home/user/workspace/qt-qnx/stage/nto/armle-v7/usr/lib/qt4/lib -L/home/user/workspace/playbook_prefix/lib -ltelepathy-qt4 -ltelepathy-qt4-farsight -ltelepathy-glib -L/home/user/workspace/glib/../playbook_prefix/lib -L/home/user/workspace/gstreamer0.10-0.10.35/../playbook_prefix/lib -L/home/user/bbndk-2.0.0/target/qnx6/armle-v7/lib -lgstreamer-0.10 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lxml2 -lglib-2.0 -lintl -liconv -ldbus-1 -lQtDeclarative -L/home/user/workspace/qt-qnx/stage/nto/armle-v7/usr/lib/qt4/lib -L/home/user/bbndk-2.0.0/target/qnx6/armle-v7/usr/lib -lQtScript -lQtSvg -lQtSql -lQtXmlPatterns -lQtNetwork -lsocket -lQtOpenGL -lQtGui -lQtCore -lm -lGLESv2 -lEGL /home/user/workspace/playbook_prefix/lib/libtelepathy-glib.so: warning: The 'tmpnam' function is dangerous. Use 'mkstemp' instead. /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::DBusProxy::busName() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::StreamedMediaChannel::handlerStreamingRequired() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::DBusProxy::objectPath() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::Channel::targetHandleType() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::Channel::connection() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::Debug::invokeDebugCallback()' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::Channel::targetHandle() const' /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so: undefined reference to `Tp::enabledWarning()' collect2: ld returned 1 exit status All those symbols should be present in libtelepathy-qt4 which is in library path and specified in command string (GCC does load it, I checked via strace -e open). So, I took a look using objdump on both libtelepathy-qt4-farsight and libtelepathy-qt4 libs. Let's look at 'Tp::DBusProxy::busName() const' for example: $ objdump -t /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4.so | grep busName 001b68b4 l F .text 0000006c .hidden _ZNK2Tp9DBusProxy7busNameEv $ objdump -T /home/user/workspace/playbook_prefix/lib/libtelepathy-qt4-farsight.so | grep busName 00000000 D *UND* 00000000 _ZNK2Tp9DBusProxy7busNameEv So, as I can understand, the symbol in question has a signature '_ZNK2Tp9DBusProxy7busNameEv' and is present in both a dynamic symbol table of telepathy-qt4-farsight and a symbol table of telepathy-qt4. The situation is the same for all symbols with problems. Why they do not resolve? On a side note, both these libs were not provided by a professional maintainer and were build by me, so they can be built wrong. Can you please provide me with any suggestions? I am totally out of ideas.
