编译时出现OpenCV Qt未定义的引用错误

Question

我正在尝试使用深度传感器(PMD Camboard)，并尝试将捕获的深度图像显示为实况流。我可以很好地从传感器获取数据。当我尝试放入OpenCV部件时，问题就开始了。它们单独工作得很好，但当我尝试集成它们时，问题就开始了。我认为错误出在CMakeLists.txt上，因为即使我尝试编写一个简单的程序，只显示摄像头提要，而没有任何深度传感器的东西，我也会得到同样的错误。当我尝试用openCV的CMake编译它时，上述程序就可以工作了。

编辑:我尝试系统地禁用CMake的某些部分，以查看到底是哪些部分触发了错误，并发现下面这行代码：

link_directories(${royale_LIB_DIR})

是导致错误的原因。

当我尝试编译时，我得到了以下错误：

    /usr/local/lib/libopencv_highgui.so.3.1.0: undefined reference to `QWidget::isFullScreen() const@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QAbstractSlider::setMinimum(int)@Qt_5'
/usr/local/lib/libopencv_highgui.so.3.1.0: undefined reference to `non-virtual thunk to QBoxLayout::minimumSize() const@Qt_5'
/usr/lib64/libQt5OpenGL.so.5: undefined reference to `QTransform::type() const@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QWidget::hasHeightForWidth() const@Qt_5'
/usr/lib64/libQt5OpenGL.so.5: undefined reference to `QPen::color() const@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QFrame::changeEvent(QEvent*)@Qt_5'
/usr/lib64/libQt5OpenGL.so.5: undefined reference to `QOpenGLMultiGroupSharedResource::insert(QOpenGLContext*, QOpenGLSharedResource*)@Qt_5_PRIVATE_API'
/usr/lib64/libQt5OpenGL.so.5: undefined reference to `QPaintDevice::~QPaintDevice()@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QObject::QObject(QObject*)@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QTabWidget::metaObject() const@Qt_5'
/usr/local/lib/libopencv_cvv.so.3.1.0: undefined reference to `QColorDialog::QColorDialog(QWidget*)@Qt_5'
/usr/local/lib/libopencv_highgui.so.3.1.0: undefined reference to `QFutureInterfaceBase::setThreadPool(QThreadPool*)@Qt_5'
/usr/lib64/libQt5OpenGL.so.5: undefined reference to 

http://pastebin.com/KLKtzzSn出现完全错误

我的CMakeLists.txt如下：

cmake_minimum_required(VERSION 2.8)

set(CMAKE_PREFIX_PATH "share")

#project (depthDataCallBack)
project (webStream)

find_package(OpenCV REQUIRED)
find_package(royale REQUIRED)


link_directories(${royale_LIB_DIR})

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/inc)

add_executable(webStream webStream.cpp)

target_link_libraries(webStream ${OpenCV_LIBS})
target_link_libraries(webStream "${royale_LIBS}")

我刚接触过CMake，只做过recently corrected。任何帮助都将不胜感激。

Answer 1

错误列表显示链接中没有Qt5小部件。将以下行添加到您的CMakeLists.txt：

target_link_libraries(webStream Qt5::Widgets)
target_link_libraries(webStream Qt5::Core)

另一个问题是Qt5是否安装在该系统中。还可以在这里阅读:只要Qt OpenGL依赖项丢失，就可以使用cmake doesn't link libGLU using QtOpenGL。