pacman/exercises/15/build_files/15-compilation-linking.md

Compilation, Linking and Assets

In this exercise we will add a couple of files to the project.

CMake

As described in the slides, the project is defined by several CMake files. The ones we are interested is CMakeLists.txt in the root project folder and the CMakeLists.txt file in the lib folder.

You can see that the root CMake file is adding the lib subdirectory, this means that it is looking for a CMakeLists.txt file within that folder.

The CMake file in the lib folder describes a few package requirements and then it does this

file(GLOB_RECURSE sources CONFIGURE_DEPENDS "*.cpp" "*.hpp")

Here it is creating a CMake variable called sources that will contain all .cpp and .hpp files within the lib folder. This means that if we want to add new files, we don't have to list them here, as any applicable files are included. But adding a file will not automatically add the file in the IDE, as CMake needs to be run again for those changes to apply.

Exercise

One of the Pac-Man ghosts is missing. We will fully implement this ghost later but for now let's add the .cpp and .hpp files to the project.

1. Create a Clyde.hpp in the lib/include folder and a Clyde.cpp file in the lib folder.

2. Run CMake again and see your IDE update to include these new files. You can try compiling again and see what happens.

3. Include the Clyde.hpp file within the Clyde.cpp file, and add #pragma once to Clyde.hpp.

4. Include Clyde.hpp in GameState.hpp and rebuild