CGAL_Boost_USE_STATIC_LIBS is now an (advanced) CMake option on all
platforms, and is stored in the generated CGALConfig.cmake. That way, its
value is proposed as the default value for the same option when programs
using CGAL are configured using CMake.
The script UseCGAL includes the module CGAL_TweakFindBoost, to define
Boost_USE_STATIC_LIBS and Boost_ADDITIONAL_VERSIONS.
Previously there was a variable CGAL_SHARED_LIBS defined by
CGALConfig.cmake. This one is now unified with CGAL_BUILD_SHARED_LIBS.
And the option CGAL_BUILD_SHARED_LIBS is only defined as an option if one
are building CGAL libraries. If CGAL_Common.cmake is included from another
project, such as from UseCGAL.cmake, then this variable is set in
CGALConfig.cmake as a regular (non-cached) CMake variable.
Laurent Rineau
Eric Berberich