cmake policy warning (CMP0063)

[basiliscos]

When I build libzip as static library, cmake complains:

CMake Warning (dev) at .../zip/lib/CMakeLists.txt:215 (ADD_LIBRARY):                                                                                     
  Policy CMP0063 is not set: Honor visibility properties for all target
  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Target "zip" of type "STATIC_LIBRARY" has the following visibility
  properties set for C:

    C_VISIBILITY_PRESET

  For compatibility CMake is not honoring them for this target.
This warning is for project developers.  Use -Wno-dev to suppress it.

cmake version 3.10.0

[0-wiz-0]

It is just a warning.
If you can show that this leads to problems, feel free to re-open.