Qt4到Qt5遷移鏈接器VS2013的警告（和錯誤）

Question

我有一個項目，我最初開始使用Qt4開發，現在正在遷移到Qt5。幾個小時後重新編寫一些代碼並刪除新棄用的調用，我可以讓項目編譯，但現在我有問題讓它鏈接。

我使用CMake來生成項目文件。我開始先修改「方案的」 CMake的文件和更換遷移：用（這需要清理）

############################################# 
# 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}) 
############################################# 

在此之後

############################################# 
# 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}) 
############################################# 

，我評論了我的所有來電ADD_SUBDIRECTORY()和開始一次添加一個。我的項目使用Log4Qt，因爲它沒有其他子目錄的依賴關係，它是我開始工作的第一個子項目。

在Log4Qt的CMakeLists.txt文件中，我只是將QT4_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})更改爲QT5_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})，將MOC_HEADERS定義爲Log4Qt中所有必需的MOC'd標頭。

當我在VS2013加載這件事而建，它編譯罰款，但聯拋出同樣的警告，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 

我繼續我的遷移，並繼續得到同樣的警告。例如，下面是子項目的一個整個的CMakeLists.txt文件：

PROJECT（網絡）

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（網絡STATIC $ {SOURCE_FILES} $ {HEADER_FILES} $ {MOC_SOURCE_FILES}）

QT5_USE_MODULES（網絡網絡）

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 

繼續前進，我繼續前進，並添加了所有相關的項目，並試圖構建項目的可執行文件。然後，我得到了以下錯誤（可執行文件的項目名稱爲「貓頭鷹」）（這是錯誤的摘要，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 

我在做什麼錯？我必須在我的CMake文件中解決這個問題嗎？我沒有看到我如何錯誤地配置CMake，或者是否有其他東西丟失？

謝謝！

Answer 1

感覺就像你沒有正確地清理你的項目構建目錄。此外，如果您的CMake版本足夠高，您可以嘗試使用CMAKE_AUTOMOC。更多詳情here。