cmake notes

this is a test

## option dependency

https://cmake.org/cmake/help/latest/module/CMakeDependentOption.html

cmake_dependent_option(<option> "<help_text>" <value> <depends> <force>)

## library

https://cmake.org/cmake/help/latest/command/target_link_libraries.html

create a library:

add_library()

target_link_libraries: specify libraries or flags to use when linking a given target and/or its dependents