what to when error "Q_OBJECT macro but does not inherit from QObject" Appear ?

[Qt embedded developer]

I have created the cmake project and in that when i link below class as static library i get the error

Q_OBJECT macro but does not inherit from QObject

#ifndef MAINAPPLICATION_H
#define MAINAPPLICATION_H

#include <QObject>

class MAinApplication
{
    Q_OBJECT
public:
    MAinApplication();
};

#endif // MAINAPPLICATION_H

#include "MAinApplication.h"

MAinApplication::MAinApplication()
{

}

cmakelist file

cmake_minimum_required(VERSION 3.6)

project(Cmake1 LANGUAGES CXX)
set(CMAKE_PREFIX_PATH "/home/HostName/Qt5.15.2/5.15.2/gcc_64" ${CMAKE_PREFIX_PATH})
set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)


find_package(Qt5 COMPONENTS Core Quick REQUIRED)

include_directories(${Qt5Widgets_INCLUDE_DIRS})

add_library(Component STATIC
    Components/MAinApplication.cpp
    Components/MAinApplication.h
    )

target_include_directories(Component PUBLIC
    ${CMAKE_CURRENT_SOURCE_DIR}/Components)

add_executable(Cmake1
    App/Main.cpp
    )

set(QML_FILES App/Gui/qml.qrc)

qt5_add_resources(QML_RESOURCES ${QML_FILES})


target_link_libraries(Cmake1
    PUBLIC Qt5::Core Qt5::Quick Component)

target_sources(Cmake1 PRIVATE ${QML_RESOURCES})

[ChrisW67]

No, your class does not inherit from QObject. That is precisely what the error message is saying.

[ChrisW67]

@Qt-embedded-developer What do you think you need the Q_OBJECT macro for if the class is not a QObject?

Are you perhaps looking for Q_GADGET?

[Qt embedded developer]

@ChrisW67 Dear it is QObject based class. but for testing purpose i just simply added through qt creator and so it look like this.

[ChrisW67]

No, your class does not inherit from QObject. That is precisely what the error message is saying.

[Qt embedded developer]

@ChrisW67 Yes I have make it correct. but after that i got the error. But that i have solved by properly updating the CMAKE. and my ultimate goal is to check the cmake base build proper works or not and it works fine

[ChrisW67]

Yes I have make it correct. but after that i got the error.

The code you posted is not correct and this has nothing to do with whether you use CMake, qmake, or hand rolled Makefiles to build it.

[Qt embedded developer]

@ChrisW67 Sorry i have not updated the code over here.