colcon build doesn't generate executables

I am trying to get started with ROS2 Humble and when running colcon build no executable files are created. My project structure looks like this: examples ├── CMakeLists.txt ├── package.xml └── src ├── CMakeLists.txt └── helloWorld.cpp File contents: examples/CMakeLists.txt: cmake_minimum_required(VERSION 3.25) project(examples LANGUAGES CXX) set(CMAKE_CXX_STANDARD 20) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) find_package(ament_cmake REQUIRED) add_subdirectory(src) ament_package() examples/src/CMakeLists.txt: add_executable(helloWorld helloWorld.cpp) examples/helloWorld.cpp #include using std::cout; using std::endl; int main() { cout