Problem when linking a Qt Unit Test with CMake

[NoRulez]

Hey @all,

i'm trying to compile a simple QtTestLib app, which ends up in a "undefined reference to vtable..." error.

Here is the simple source:

#include <QtTest>
 
class TestDemo: public QObject {
    Q_OBJECT
 
private slots:
    void initTestCase();
    void cleanupTestCase();
    void firstTest();
 
};
 
void TestDemo::initTestCase() {
}
 
void TestDemo::cleanupTestCase() {
}
 
void TestDemo::firstTest() {
    QVERIFY(1 == 1);
}
 
QTEST_MAIN(TestDemo)

#include <QtTest>

class TestDemo: public QObject {
    Q_OBJECT

private slots:
    void initTestCase();
    void cleanupTestCase();
    void firstTest();

};

void TestDemo::initTestCase() {
}

void TestDemo::cleanupTestCase() {
}

void TestDemo::firstTest() {
    QVERIFY(1 == 1);
}

QTEST_MAIN(TestDemo)

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And here is the corresponding CMakeLists.txt file:

SET(QT_USE_QTMAIN TRUE)
SET(QT_USE_QTTEST TRUE)
 
INCLUDE(${QT_USE_FILE})
INCLUDE_DIRECTORIES(./)
 
SET(TESTDEMO_SOURCES
    main.cpp
)
 
QT4_AUTOMOC(${TESTDEMO_SOURCES})
ADD_EXECUTABLE(TestDemo ${TESTDEMO_SOURCES} ${TESTDEMO_MOC})
TARGET_LINK_LIBRARIES(TestDemo ${QT_LIBRARIES})

SET(QT_USE_QTMAIN TRUE)
SET(QT_USE_QTTEST TRUE)

INCLUDE(${QT_USE_FILE})
INCLUDE_DIRECTORIES(./)

SET(TESTDEMO_SOURCES
    main.cpp
)

QT4_AUTOMOC(${TESTDEMO_SOURCES})
ADD_EXECUTABLE(TestDemo ${TESTDEMO_SOURCES} ${TESTDEMO_MOC})
TARGET_LINK_LIBRARIES(TestDemo ${QT_LIBRARIES})

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The error I get is the following:

-- Configuring done
-- Generating done
-- Build files have been written to: build/Debug
Scanning dependencies of target TestDemo
[100%] Building CXX object test/TestDemo/CMakeFiles/TestDemo.dir/main.cpp.obj
Linking CXX executable ..\..\bin\TestDemo.exe
CMakeFiles\TestDemo.dir\main.cpp.obj: In function `TestDemo':
test/TestDemo/main.cpp:4: undefined reference to `vtable for TestDemo'
CMakeFiles\TestDemo.dir\main.cpp.obj: In function `~TestDemo':
test/TestDemo/main.cpp:4: undefined reference to `vtable for TestDemo'
collect2: ld returned 1 exit status
mingw32-make[3]: *** [bin/TestDemo.exe] Error 1
mingw32-make[2]: *** [test/TestDemo/CMakeFiles/TestDemo.dir/all] Error 2
mingw32-make[1]: *** [test/TestDemo/CMakeFiles/TestDemo.dir/rule] Error 2
mingw32-make: *** [TestDemo] Error 2

-- Configuring done
-- Generating done
-- Build files have been written to: build/Debug
Scanning dependencies of target TestDemo
[100%] Building CXX object test/TestDemo/CMakeFiles/TestDemo.dir/main.cpp.obj
Linking CXX executable ..\..\bin\TestDemo.exe
CMakeFiles\TestDemo.dir\main.cpp.obj: In function `TestDemo':
test/TestDemo/main.cpp:4: undefined reference to `vtable for TestDemo'
CMakeFiles\TestDemo.dir\main.cpp.obj: In function `~TestDemo':
test/TestDemo/main.cpp:4: undefined reference to `vtable for TestDemo'
collect2: ld returned 1 exit status
mingw32-make[3]: *** [bin/TestDemo.exe] Error 1
mingw32-make[2]: *** [test/TestDemo/CMakeFiles/TestDemo.dir/all] Error 2
mingw32-make[1]: *** [test/TestDemo/CMakeFiles/TestDemo.dir/rule] Error 2
mingw32-make: *** [TestDemo] Error 2

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Could anybody help me to fix the problem?

Thanks in advance

Best Regards
NoRulez

[Zlatomir]

You forgot to include your .moc file in the end

QTEST_MAIN(TestDemo) // after this
#include "testdemo.moc"

QTEST_MAIN(TestDemo) // after this
#include "testdemo.moc"

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[NoRulez]

When I include "testdemo.moc" or "TestDemo.moc" i get the following error:

test\TestDemo\main.cpp:34:24: error: testdemo.moc: No such file or directory
test\TestDemo\main.cpp:34:24: error: TestDemo.moc: No such file or directory

test\TestDemo\main.cpp:34:24: error: testdemo.moc: No such file or directory
test\TestDemo\main.cpp:34:24: error: TestDemo.moc: No such file or directory

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[Zlatomir]

Take a look in the project folder and see what is the name of .moc file

[NoRulez]

I think the problem is only when using MinGW, but anyway, how can I solve this problem without including the "*.moc" at the end of the file?

Thanks in advance

[Onanymous]

http://qtnode.net/wiki/Qt4_with_cmake :

If you don't use the #include "header.moc" convention, you can use the QT4_WRAP_CPP macro. This generates a list of moc_xxxx.cxx files to be generated. You pass in the list of headers to be moc'ed, and get back a list of source files to add to your build target. This is similar to how qmake works with Qt4

[NoRulez]

The problem is, that I only have a "main.cpp" file, it doesn't use any header files.