What is the procedure for incorporating headers and sources of a submodule into the CMakeLists.txt file of the main module?

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1. Add the submodule to the main module's repository:

   • If the submodule is not already added, use git submodule add to add the submodule to the main module's repository.
   • If the submodule is already added as a directory in the repository, remove it with git rm --cached <submodule_dir> and then add it as a submodule with git submodule add.

2. Configure the CMakeLists.txt file:

   • Add the following lines to include the submodule's headers in the main module's build: include_directories(<submodule_dir>/include)
   • Add the following lines to link the submodule's shared or static library with the main module's executable: add_subdirectory(<submodule_dir>) target_link_libraries(<main_module_executable> <submodule_library>)

3. Build the project:

   • Run cmake to generate the build files for the main module, including the submodule.
   • Build the project with make or the appropriate build tool for your platform.

Note: The submodule must have its own CMakeLists.txt file with instructions on how to build the shared or static library.