I have a project that I originally started developing using Qt4 and am now working on migrating to Qt5. After a couple hours reworking some code and removing newly deprecated calls, I was able to get the project to compile but now I'm having problems getting it to link.
我有一个项目，我最初是使用Qt4开发的，现在正致力于迁移到Qt5。经过几个小时的重新编写代码和删除新弃用的调用之后，我能够让这个项目进行编译，但是现在我遇到了让它链接起来的问题。
I am using CMake to generate the project files. I started migrating by first modifying the "solutions's" CMake file and replacing:
我正在使用CMake生成项目文件。我开始迁移，首先修改“解决方案”CMake文件并替换:
#############################################
# 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})
#############################################
with (this needs to be cleaned up)
(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})
#############################################
After this, I commented out all my calls to ADD_SUBDIRECTORY() and started adding them back in one at a time. My project uses Log4Qt and since that has no other dependencies on other subdirectories, it was the first subproject I started working on.
在此之后，我将所有对ADD_SUBDIRECTORY()的调用都注释掉，并开始一次将它们添加回一个。我的项目使用Log4Qt，因为它与其他子目录没有其他依赖关系，这是我开始工作的第一个子项目。
In Log4Qt's CMakeLists.txt file, I simply changed QT4_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS}) to QT5_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS}), with MOC_HEADERS being defined as all the necessarily MOC'd headers in Log4Qt.
Log4Qt CMakeLists。txt文件，我简单地将QT4_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})更改为QT5_WRAP_CPP(MOC_SOURCE_FILES ${MOC_HEADERS})， MOC_HEADERS被定义为Log4Qt中所有必须的MOC文件头。
When I load this up in VS2013 and build, it compiles fine but linking throws the same warnings for every moc_*:
当我在VS2013中加载它并构建时，它会编译好，但是链接会对每个moc_*发出相同的警告:
>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
I continued with my migration and continue to get the same warnings. For example, here is the entire CMakeLists.txt file for one of the subprojects:
我继续迁移，并继续得到相同的警告。例如，这里是整个CMakeLists。一个子项目的txt文件:
PROJECT(Network)
项目(网络)
INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
INCLUDE_DIRECTORIES($ { CMAKE_CURRENT_BINARY_DIR })
SET (SOURCE_FILES RequestCache.cpp WebClient.cpp )
集(SOURCE_FILES RequestCache。cpp WebClient。cpp)
SET (MOC_HEADERS RequestCache.h WebClient.h )
集(MOC_HEADERS RequestCache。h WebClient。h)
SET (HEADER_FILES ${MOC_HEADERS} )
集(HEADER_FILES $ { MOC_HEADERS })
SET(DEPENDENCY_LIST log4qt Core )
集(DEPENDENCY_LIST log4qt核心)
ADD_LIBRARY(Network STATIC ${SOURCE_FILES} ${HEADER_FILES} ${MOC_SOURCE_FILES} )
ADD_LIBRARY(网络静态${SOURCE_FILES} ${MOC_SOURCE_FILES})
QT5_USE_MODULES(Network Network)
QT5_USE_MODULES(网络网络)
And (some of) the warnings:
以及(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
Pressing ahead still, I went ahead and added all the relevant projects and attempted to build the project's executable. And then I got the following errors (the executable's project name being 'Owl') (this is an excerpt of the errors, not the full listing):
继续前进，我继续前进，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(可执行程序的项目名称是“Owl”)(这是错误的摘录，而不是完整的清单):
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
What am I doing wrong? Do I have to fix this in my CMake files? I fail to see how I'm configuring CMake incorrectly or is there's something else I'm missing?
我做错了什么?我必须在我的CMake文件中解决这个问题吗?我没有看到我是如何正确配置CMake的，或者我还缺少什么?
Thank you!
谢谢你！
1 个解决方案
#1
3
It feels like you didn't clean your project build directory properly. Also if your CMake version is high enough you can try using CMAKE_AUTOMOC. More details here.
感觉您没有正确地清理您的项目构建目录。如果您的CMake版本足够高，您可以尝试使用cmake_auto。更多细节在这里。
#1
3
It feels like you didn't clean your project build directory properly. Also if your CMake version is high enough you can try using CMAKE_AUTOMOC. More details here.
感觉您没有正确地清理您的项目构建目录。如果您的CMake版本足够高，您可以尝试使用cmake_auto。更多细节在这里。