[main.cpp]
#include "my_application.h"

#include <thread>

int main( int argc, char* argv[] )
{
  printf( "QT_VERSION_STR: %s\n", QT_VERSION_STR );

  My_application app( argc, argv );

  QObject::connect( &app, &My_application::on_command, [&]( const char* buffer_ ) {
    printf("My_application::on_command: %s\n", buffer_);
  } );

#if 0
  auto my_thread_proc = [&app](){
    for(int i = 0; i < 100; ++i)
    {
      app.post_command("some_command");
    }
  };
  auto my_thread1 = std::thread(my_thread_proc);
#endif

  QWidget window;
  window.resize( 320, 240 );
  window.show();

  int result = app.exec();

  printf("---> after app.exec()\n");

  return result;
}

[my_application.h]
#pragma once

#include <QtWidgets>

class My_application : public QApplication
{
    Q_OBJECT
public:
    explicit My_application( int& argc, char** argv );
    void post_command( const char* buffer_ );
    Q_SIGNAL void on_command( const char* buffer_ );
};

[my_application.cpp]
#include "my_application.h"

My_application::My_application( int& argc, char** argv ) : QApplication( argc, argv ){}

void My_application::post_command( const char* buffer_ )
{
  QMetaObject::invokeMethod(
    this, [this, buffer_] { Q_EMIT on_command( buffer_ ); }, Qt::QueuedConnection );
}

[CMakeLists.txt]
cmake_minimum_required (VERSION 3.14)

project(qt_tsan_tests)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

add_executable (qt_tsan_tests my_application.h my_application.cpp main.cpp)

find_package(Qt5 CONFIG COMPONENTS Widgets REQUIRED) # using Fedora36 default Qt 5.15.6

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fno-omit-frame-pointer -Wall -Wextra -fsanitize=thread" )
SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fno-omit-frame-pointer -fsanitize=thread")

target_link_libraries(qt_tsan_tests PRIVATE Qt5::Widgets)