Question

我觉得QT5库在与cmake链接时没有正确链接。我有一个cmake文件，设置了使用QT4或QT5的选项：

if(USE_Qt5)

    if(NOT Qt5_PREFIX_PATH)
        set(Qt5_PREFIX_PATH /Applications/Qt/5.2.1/clang_64)
    endif(NOT Qt5_PREFIX_PATH)
    set(WINSDK_LIB_DIR 
        "C:/Program Files (x86)/Windows Kits/8.0/Lib/win8/um/x64" 
        "C:/Program Files (x86)/Microsoft SDKs/Windows/v7.0A/Lib"
    )
    set(CMAKE_PREFIX_PATH ${3RDPARTY} ${Qt5_PREFIX_PATH} ${WINSDK_LIB_DIR} ${CMAKE_PREFIX_PATH})
    message(STATUS "Qt5 prefix path set to: ${CMAKE_PREFIX_PATH}")
    find_package(Qt5Widgets)
    find_package(Qt5OpenGL)
endif(USE_Qt5)

if(USE_Qt4)
    file(GLOB QT4ROOTS ${3RDPARTY}/Qt/*/bin)
    find_program(QT_QMAKE_EXECUTABLE NAMES qmake qmake4 qmake-qt4 PATHS ${QT4ROOTS})
    find_package(Qt4 REQUIRED)
    set(QT_USE_QTOPENGL TRUE)
endif(USE_Qt4)

如果选择qt4没问题，编译并执行。编译Qt5会返回很多错误，在我看来是一个链接问题：

/Applications/Qt/5.2.1/clang_64/lib/QtWidgets.framework/Headers/qsizepolicy.h:52:24: error: variable has incomplete type 'class Q_WIDGETS_EXPORT'
class Q_WIDGETS_EXPORT QSizePolicy
                       ^
/Applications/Qt/5.2.1/clang_64/lib/QtWidgets.framework/Headers/qsizepolicy.h:52:7: note: forward declaration of 'Q_WIDGETS_EXPORT'
class Q_WIDGETS_EXPORT QSizePolicy
      ^
/Applications/Qt/5.2.1/clang_64/lib/QtWidgets.framework/Headers/qsizepolicy.h:52:35: error: expected ';' after top level declarator
class Q_WIDGETS_EXPORT QSizePolicy
                                  ^
                                  ;
/Applications/Qt/5.2.1/clang_64/lib/QtWidgets.framework/Headers/qsizepolicy.h:163:31: error: expected a class or namespace
Q_DECLARE_OPERATORS_FOR_FLAGS(QSizePolicy::ControlTypes)

???

这是我链接库：

if(USE_Qt4 OR USE_Qt5)
    set(CMAKE_INCLUDE_CURRENT_DIR ON)
    set(CMAKE_AUTOMOC ON)
    # disable autolinking to qmain
    cmake_policy(SET CMP0020 OLD)
    set(USE_QT true)
    add_definitions(-DWITH_QT)
endif(USE_Qt4 OR USE_Qt5)

if(USE_Qt5)
#target_link_libraries(myProject
 #   Qt5::Widgets
#)
    qt5_use_modules(myProject Widgets)
endif(USE_Qt5)

Cmake QT5链接错误

0 个答案: