if(WIN32)
    ...
    set(WIN_FLAG "WIN32")
    ...
endif()
...
set(SOURCE_EXE main.cpp)
...
add_executable(app_binary ${WIN_FLAG} ${SOURCE_EXE})
...

...
#ifdef Q_OS_WIN                                                                  
    #include <windows.h>                                                         
#endif                                                                           
...   
int main(int argc, char** argv){                                                 
 
    #ifdef Q_OS_WIN                                                                 
        // Console output. Work with MSYS2 terminal                                 
        AttachConsole(ATTACH_PARENT_PROCESS);                                       
    #endif                                                                       
 
    QApplication app(argc, argv);                                                   
 
    QAppWindow appWindow;                                                        
    appWindow.show();                                                               
    int retn = app.exec();                                                       
 
    return retn;                                                                    
}