qt - QMake: how to choose version of library to link to -


there simple computer vision application uses opencv. compiling on host system deploy nvidia jetson tk1 (no problems here, use qt creator configured kit). use sshfs mount jetson's filesystem root host /mnt/sysroot_tegra_tk1.

the problem: i've compiled opencv version 3.2 on jetson (installed board /usr/local/lib). there still system opencv version 2.4 in /usr/local. don't know how configure qmake on host system cross compile , link new version instead of jetson's system default.

my .pro file:

qt += core qt -= gui  config += c++11  target = markerextractionchromakey config += console config -= app_bundle  unix: includepath += /usr/local/include unix: qmake_libdir = /usr/local/lib  unix: libs +=  -lopencv_imgproc\                -lopencv_core.so\                -lopencv_video\                -lopencv_highgui\                -lopencv_gpu  template = app  headers += cameraworker.h  sources += main.cpp \            cameraworker.cpp  target.path = /home/ubuntu/alan/markerextractionchromakey target.files += markerextractionchromakey installs += target

project linkage output:

/usr/bin/arm-linux-gnueabihf-g++ -wl,-rpath-link,/mnt/sysroot_tegra_tk1/usr/lib -wl,-rpath-link,/mnt/sysroot_tegra_tk1/usr/lib/arm-linux-gnueabihf -wl,-rpath-link,/mnt/sysroot_tegra_tk1/lib/arm-linux-gnueabihf -mfloat-abi=hard  --sysroot=/mnt/sysroot_tegra_tk1 -wl,-rpath,/usr/local/qt5/lib -o markerextractionchromakey main.o cameraworker.o   -l/usr/local/lib -lopencv_imgproc -lopencv_core -lopencv_video -lopencv_highgui  -lopencv_gpu -l/opt/qt5_for_tegra/qt-everywhere-opensource-src-5.5.1/qtbase/lib  -lqt5core -l/mnt/sysroot_tegra_tk1/usr/lib  -l/mnt/sysroot_tegra_tk1/lib/arm-linux-gnueabihf  -l/mnt/sysroot_tegra_tk1/usr/lib/arm-linux-gnueabihf -lpthread

problem solved. key moments:

  1. different versions placed in different locations (using explicit soname option, in case libraries placed outside linker default scope).
  2. there must correct -rpath/-rpath-link tell linker for.

  3. default -rpath locations jetson specified in <path qt>/qt-everywhere-opensource-src-5.5.1/qtbase/mkspecs/devices/linux-jetson-tk1-g++/qmake.conf. add directory before default ones:

    qmake_incdir += \     $$[qt_sysroot]/usr/local/include \     $$[qt_sysroot]/usr/include \     $$[qt_sysroot]/usr/include/arm-linux-gnueabihf  qmake_libdir += \     $$[qt_sysroot]/usr/local/lib \     $$[qt_sysroot]/usr/lib \     $$[qt_sysroot]/lib/arm-linux-gnueabihf \     $$[qt_sysroot]/usr/lib/arm-linux-gnueabihf  qmake_lflags += \     -wl,-rpath-link,$$[qt_sysroot]/usr/local/lib \     -wl,-rpath-link,$$[qt_sysroot]/usr/lib \     -wl,-rpath-link,$$[qt_sysroot]/usr/lib/arm-linux-gnueabihf \     -wl,-rpath-link,$$[qt_sysroot]/lib/arm-linux-gnueabihf

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