Qt4到Qt5迁移链接器VS2013的警告（和错误）

Question

我有一个项目，我最初开始使用Qt4开发，现在正在迁移到Qt5。几个小时后重新编写一些代码并删除新弃用的调用，我可以让项目编译，但现在我有问题让它链接。

我使用CMake来生成项目文件。我开始先修改“方案的” CMake的文件和更换迁移：用（这需要清理）

############################################# 
# find QT 
set(CMAKE_INCLUDE_CURRENT_DIR ON) 
set(CMAKE_AUTOMOC ON) 

FIND_PACKAGE(Qt5Concurrent REQUIRED) 
FIND_PACKAGE(Qt5Core REQUIRED) 
FIND_PACKAGE(Qt5Network REQUIRED) 
FIND_PACKAGE(Qt5Sql REQUIRED) 
FIND_PACKAGE(Qt5WebKit REQUIRED) 
FIND_PACKAGE(Qt5WebKitWidgets REQUIRED) 
FIND_PACKAGE(Qt5Widgets REQUIRED) 
FIND_PACKAGE(Qt5Xml REQUIRED) 

INCLUDE_DIRECTORIES(
    ${Qt5Concurrent_INCLUDE_DIRS} 
    ${QT5_FOLDER} 
    "C:/Qt/Qt5.0.2/5.0.2/msvc2012_64/include" 
) 

ADD_DEFINITIONS(${QT_DEFINITIONS}) 
############################################# 

在此之后

############################################# 
# find QT 
FIND_PACKAGE(Qt4 REQUIRED) 

# configure QT modules 
SET(QT_USER_QTCORE TRUE) 
SET(QT_USE_QTMAIN TRUE) 
SET(QT_USE_QTWEBKIT TRUE) 
SET(QT_USE_QTNETWORK TRUE) 
SET(QT_USE_QTSQL TRUE) 

SET(QT_USE_QTXML TRUE) 
SET(QT_USE_QTUITOOLS TRUE) 

# include QT requirements 
INCLUDE(${QT_USE_FILE}) 
ADD_DEFINITIONS(${QT_DEFINITIONS}) 
############################################# 

，我评论了我的所有来电ADD_SUBDIRECTORY()和开始一次添加一个。我的项目使用Log4Qt，因为它没有其他子目录的依赖关系，它是我开始工作的第一个子项目。

在Log4Qt的CMakeLists.txt文件中，我只是将QT4_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})更改为QT5_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})，将MOC_HEADERS定义为Log4Qt中所有必需的MOC'd标头。

当我在VS2013加载这件事而建，它编译罚款，但联抛出同样的警告，每moc_ *：

>moc_stringmatchfilter.obj : warning LNK4006: "public: static struct QMetaObject const Log4Qt::StringMatchFilter::staticMetaObject" (?staticMetaObject@StringMatchFilter@Log4Qt@@2UQMetaObject@@B) already defined in log4qt_automoc.obj; second definition ignored 
>moc_stringmatchfilter.obj : warning LNK4006: "private: static void __cdecl Log4Qt::StringMatchFilter::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@StringMatchFilter@Log4Qt@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z) already defined in log4qt_automoc.obj; second definition ignored 
>moc_stringmatchfilter.obj : warning LNK4006: "public: virtual struct QMetaObject const * __cdecl Log4Qt::StringMatchFilter::metaObject(void)const " (?metaObject@StringMatchFilter@Log4Qt@@UEBAPEBUQMetaObject@@XZ) already defined in log4qt_automoc.obj; second definition ignored 
>moc_stringmatchfilter.obj : warning LNK4006: "public: virtual void * __cdecl Log4Qt::StringMatchFilter::qt_metacast(char const *)" (?qt_metacast@StringMatchFilter@Log4Qt@@UEAAPEAXPEBD@Z) already defined in log4qt_automoc.obj; second definition ignored 
>moc_stringmatchfilter.obj : warning LNK4006: "public: virtual int __cdecl Log4Qt::StringMatchFilter::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@StringMatchFilter@Log4Qt@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z) already defined in log4qt_automoc.obj; second definition ignored 
>moc_stringmatchfilter.obj : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library 

我继续我的迁移，并继续得到同样的警告。例如，下面是子项目的一个整个的CMakeLists.txt文件：

PROJECT（网络）

INCLUDE_DIRECTORIES（$ {} CMAKE_CURRENT_BINARY_DIR）

SET（SOURCE_FILES RequestCache.cpp WebClient的。 CPP）

SET（MOC_HEADERS RequestCache.h WebClient.h）

SET（HEADER_FILES $ {} MOC_HEADERS）

SET（DEPENDENCY_LIST log4qt核心）

ADD_LIBRARY（网络STATIC $ {SOURCE_FILES} $ {HEADER_FILES} $ {MOC_SOURCE_FILES}）

QT5_USE_MODULES（网络网络）

和（一些）警告：

moc_WebClient.obj : warning LNK4006: "public: virtual struct QMetaObject const * __cdecl owl::WebClient::metaObject(void)const " (?metaObject@WebClient@owl@@UEBAPEBUQMetaObject@@XZ) already defined in Network_automoc.obj; second definition ignored 
moc_WebClient.obj : warning LNK4006: "public: virtual void * __cdecl owl::WebClient::qt_metacast(char const *)" (?qt_metacast@WebClient@owl@@UEAAPEAXPEBD@Z) already defined in Network_automoc.obj; second definition ignored 
moc_WebClient.obj : warning LNK4006: "public: virtual int __cdecl owl::WebClient::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@WebClient@owl@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z) already defined in Network_automoc.obj; second definition ignored 
moc_WebClient.obj : warning LNK4006: "private: static void __cdecl owl::WebClient::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@WebClient@owl@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z) already defined in Network_automoc.obj; second definition ignored 
moc_WebClient.obj : warning LNK4006: "public: static struct QMetaObject const owl::WebClient::staticMetaObject" (?staticMetaObject@WebClient@owl@@2UQMetaObject@@B) already defined in Network_automoc.obj; second definition ignored 
moc_WebClient.obj : warning LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library 

继续前进，我继续前进，并添加了所有相关的项目，并试图构建项目的可执行文件。然后，我得到了以下错误（可执行文件的项目名称为“猫头鹰”）（这是错误的摘要，而不是完整的列表）：

error LNK2005: "public: static struct QMetaObject const owl::PostListWebView::staticMetaObject" (?staticMetaObject@PostListWebView@owl@@2UQMetaObject@@B) already defined in moc_PostListView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "private: static void __cdecl owl::PostListWebView::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@PostListWebView@owl@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z) already defined in moc_PostListView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "public: virtual struct QMetaObject const * __cdecl owl::BoardTreeView::metaObject(void)const " (?metaObject@BoardTreeView@owl@@UEBAPEBUQMetaObject@@XZ) already defined in moc_BoardTreeView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "public: virtual void * __cdecl owl::BoardTreeView::qt_metacast(char const *)" (?qt_metacast@BoardTreeView@owl@@UEAAPEAXPEBD@Z) already defined in moc_BoardTreeView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "public: virtual int __cdecl owl::BoardTreeView::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@BoardTreeView@owl@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z) already defined in moc_BoardTreeView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "private: static void __cdecl owl::BoardTreeView::qt_static_metacall(class QObject *,enum QMetaObject::Call,int,void * *)" (?qt_static_metacall@BoardTreeView@owl@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z) already defined in moc_BoardTreeView.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "public: virtual struct QMetaObject const * __cdecl owl::ConfiguringBoardDlg::metaObject(void)const " (?metaObject@ConfiguringBoardDlg@owl@@UEBAPEBUQMetaObject@@XZ) already defined in moc_ConfiguringBoardDlg.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 
error LNK2005: "public: virtual void * __cdecl owl::ConfiguringBoardDlg::qt_metacast(char const *)" (?qt_metacast@ConfiguringBoardDlg@owl@@UEAAPEAXPEBD@Z) already defined in moc_ConfiguringBoardDlg.obj C:\vbulletin\cmake\deltas\Win64\Deltas\Owl_automoc.obj Owl 

我在做什么错？我必须在我的CMake文件中解决这个问题吗？我没有看到我如何错误地配置CMake，或者是否有其他东西丢失？

谢谢！

Answer 1

感觉就像你没有正确地清理你的项目构建目录。此外，如果您的CMake版本足够高，您可以尝试使用CMAKE_AUTOMOC。更多详情here。