This is a CMake script that helps organizing components in a software project.
A component in this context is a project developed independently, that is used in another project in the form of source files. The script allows configuring the used components in a uniform manner, as a part of host project configuration. Various parts of the component (libraies, headers, tests etc) are added to the corresponding sets of the host project and become available for use.
A project that uses components must have a directory where the components are
placed, probably as git submodules. This script resides in a directory
component.cmake inside this directory:
...
<directory-for-components>
component.cmake
main.cmake
<component1-directory>
include/
src/
unittests/
CMakeLists.txt
<component2-directory>
CMakeLists.txt of a component includes main.cmake, then it can make calls
to functions like make_component_tests, make_component_library etc to
configure the component. These functions configure a component as standalone
project or as a part of another.