[SOLVED] Compiling Qt Plugin with CMake issue

[postb99]

Hello,

I am switching my .pro project to CMake.

It's a Qt 4 custom plugin.

For now it doesn't build, it complains here: "undefined interface" where I do Q_INTERFACES...

@#include <QObject>
#include "XAppletPlugin.h"
#include "XApplet.h"

namespace tutorial1 {
/**

• @brief AppletTutorial1 plugin class
  */
  class APPLETTUTORIAL1SHARED_EXPORT AppletTutorial1 : public QObject, public XAppletPlugin
  {
  // Q_OBJECT macro should appear in any class derived from QObject
  Q_OBJECT
  // Q_INTERFACES should appear in any class derived from a given interface
  Q_INTERFACES(XAppletPlugin)@

"XAppletPlugin.h" is correctly found and include isn't in error, only "Q_INTERFACES" line If I hover with the mouse on include lines at top I see the full path of file as tooltip and it's OK: "C:\myExternalLib\relWithDebInfo\include\container-data\XAppletPlugin.h"

So here is my CMakeLists:

@cmake_minimum_required(VERSION 2.8.8)

project(applettutorial1)

FIND_PACKAGE(Qt4 REQUIRED)

application headers files

SET(applettutorial1_HEADERS
"include/applettutorial1.h"
"include/applet-tutorial1_global.h"
"include/applettutorial1imp.h"
)

application files: source and headers again

so that they show up in project files tree

SET(applettutorial1_SOURCES
${applettutorial1_HEADERS}
src/applettutorial1.cpp
src/applettutorial1imp.cpp
tutorial1.xml
)

MESSAGE(STATUS "Source files: " ${applettutorial1_SOURCES} )

Required

QT4_WRAP_CPP(applettutorial1_HEADERS_MOC ${applettutorial1_HEADERS})

SET(applettutorial1_RESOURCES images.qrc)

#QT4_ADD_RESOURCES(applettutorial1_RESOURCES_RCC ${applettutorial1_RESOURCES})

if (QT4_FOUND)

SET(QT_USE_QTDESIGNER ON)

INCLUDE(${QT_USE_FILE})
ADD_DEFINITIONS(${QT_DEFINITIONS})

else()
message(FATAL_ERROR "No Qt4 found")
endif()

IF(CMAKE_BUILD_TYPE MATCHES DEBUG)
SET(EXTERNALLIB_BASE "$ENV{EXTERNALLIB}/debug")
ELSE()
SET(EXTERNALLIB_BASE "$ENV{EXTERNALLIB}/relWithDebInfo")
ENDIF()

MESSAGE(STATUS "EXTERNALLIB base dir: " ${EXTERNALLIB_BASE} )

EXTERNALLIB version

SET(VERSION "0.24.0")

EXTERNALLIB includes

include_directories(
"${CMAKE_CURRENT_SOURCE_DIR}/include"
"${EXTERNALLIB_BASE}/include"
"${EXTERNALLIB_BASE}/include/container-data"
)

link_directories("${EXTERNALLIB_BASE}/lib")

executable then list of files

add_executable(
applettutorial1
${applettutorial1_SOURCES}
${applettutorial1_HEADERS_MOC}

${applettutorial1_RESOURCES_RCC}

)

target_link_libraries(
applettutorial1
${QT_LIBRARIES}
container-data
)@

In my code there is no "Q_EXPORT_PLUGIN2" because this is managed by the external lib I use, which acts as a plugin host.

Thanks,

[postb99]

I've changed "add_executable" to the following but I didn't solve the error for now.

@# name, type then list of files
add_library(
applettutorial1 SHARED
${applettutorial1_SOURCES}
${applettutorial1_HEADERS_MOC}

${applettutorial1_RESOURCES_RCC}

)@

[postb99]

Better use:
@SET (CMAKE_AUTOMOC ON)@

rather than old way of using:
@QT4_WRAP_CPP@

But then I still have linkage errors:
@
applettutorial1.cpp.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) const tutorial1::AppletTutorial1::vftable'{for XAppletPlugin'}" (_imp??_7AppletTutorial1@tutorial1@@6BXAppletPlugin@@@) referenced in function "public: __cdecl tutorial1::AppletTutorial1::AppletTutorial1(void)" (??0AppletTutorial1@tutorial1@@QEAA@XZ)@

This page needs to be updated/added to wiki and updated/better referenced too...

[postb99]

Solved by including the right headers (there was a check against CMAKE_BUILD_TYPE) and building as STATIC instead of SHARED... Wow.

Now I'm going to see execution part.

@cmake_minimum_required(VERSION 2.8.8)

project(applettutorial1)

FIND_PACKAGE(Qt4 REQUIRED)

application headers files

SET(applettutorial1_HEADERS
"include/applettutorial1.h"
"include/applet-tutorial1_global.h"
"include/applettutorial1imp.h"
"include/TestInterface.h"
)

application files: source and headers again

so that they show up in project files tree

SET(applettutorial1_SOURCES
${applettutorial1_HEADERS}
src/applettutorial1.cpp
src/applettutorial1imp.cpp
tutorial1.xml
)

MESSAGE(STATUS "Source files: " ${applettutorial1_SOURCES} )

SET (CMAKE _AUTOMOC ON)

if (QT4_FOUND)
INCLUDE(${QT_USE_FILE})
else()
message(FATAL_ERROR "No Qt4 found")
endif()

MESSAGE(STATUS "QT_USE_FILE: " ${QT_USE_FILE} )

IF(CMAKE_BUILD_TYPE MATCHES Debug)
SET(EXTERNALLIB_BASE "$ENV{EXTERNALLIB}/debug")
MESSAGE(STATUS "Debug build")
ELSE()
SET(EXTERNALLIB_BASE "$ENV{EXTERNALLIB}/relWithDebInfo")
MESSAGE(STATUS "Not debug build")
ENDIF()

MESSAGE(STATUS "Build type: " ${CMAKE_BUILD_TYPE} )

MESSAGE(STATUS "EXTERNALLIB base dir: " ${EXTERNALLIB_BASE} )

EXTERNALLIB version

SET(VERSION "0.24.0")

includes

include_directories(
"${CMAKE_CURRENT_SOURCE_DIR}/include"
"${EXTERNALLIB_BASE}/include"
"${EXTERNALLIB_BASE}/include/foundation"
${CMAKE_CURRENT_BINARY_DIR}
${QT_QTCORE_INCLUDE_DIR}
${QT_INCLUDE_DIR}
)

link_directories("${EXTERNALLIB_BASE}/lib")

name, type then list of files

add_library(
applettutorial1 STATIC
${applettutorial1_SOURCES}
${applettutorial1_HEADERS}
)

target_link_libraries(
applettutorial1
${QT_LIBRARIES}
foundation
)

#install...
@