[CMake] Problems with CMake and static Qt plugins

[Michael Hertling]

On 03/02/2012 02:48 PM, NoRulez wrote:
> Hello,
> 
> I use Qt 4.8.0 from the QtSDK and Iwant to generate a static qt plugin.
> In my main.cpp I have the following:
> 
> 
> #include<QApplication>
> #include<QtPlugin>
> 
> Q_IMPORT_PLUGIN(Local)
> 
> intmain(intargc,char*argv[]){
> QApplicationapp(argc,argv);
> 
>      .
>      .
>      .
>         return  app.exec();
> 
> }
> 
> The corresponding CMakeLists.txt for the LocalPlugin looks like the following:
> 
> SET(LOCALPLUGIN_HEADERS
> 
>      LocalPlugin.h
> 
> )
> 
> SET(LOCALPLUGIN_SOURCES
> 
>      LocalPlugin.cpp
> 
> )
> 
> 
> SET(QT_USE_QTGUITRUE)
> SET(QT_USE_QTPLUGINTRUE)
> 
> QT4_AUTOMOC(${LOCALPLUGIN_SOURCES})
> QT4_WRAP_CPP(LOCALPLUGIN_MOC${LOCALPLUGIN_HEADERS})
> 
> ADD_LIBRARY(Local  STATIC  ${LOCALPLUGIN_HEADERS}  ${LOCALPLUGIN_SOURCES}  ${LOCALPLUGIN_MOC})
> 
> TARGET_LINK_LIBRARIES(Local  ${QT_LIBRARIES})
> 
> 
> The corresponding CMakeLists.txt for the main app looks like the following:
> 
> SET(QT_USE_QTMAINTRUE)
> 
> SET(QT_USE_QTGUI  TRUE)
> 
> ADD_EXECUTABLE(MyApp WIN32  ${APP_SOURCES}  ${APP_RCC}  MyApp.rc)
> TARGET_LINK_LIBRARIES(MyAppLocal  ${QT_LIBRARIES})
> 
> When I compile it I get the following error:
> In function `StaticLocalPluginInstance': undefined reference to `qt_plugin_instance_Local()'
> 
> Please, could anybody help me to get it working?

Did you INCLUDE(${QT_USE_FILE}) in the correct place, i.e. after
setting the QT_USE_QT* variables? QT_LIBRARIES is populated in
that file.

Moreover, the lines

SET(QT_USE_QTGUITRUE)
SET(QT_USE_QTMAINTRUE)
SET(QT_USE_QTPLUGINTRUE)
QT4_WRAP_CPP(LOCALPLUGIN_MOC${LOCALPLUGIN_HEADERS})

are obviously missing blanks - just typos in your report?

Regards,

Michael