Rule variable to create a static library.
This is a rule variable that tells CMake how to create a static library for the language <LANG>.
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/variable/CMAKE_LANG_CREATE_STATIC_LIBRARY.html