[CMake] Policy CMP0063 is not set: Honor visibility properties for all target

[Alexander Shukaev]

Hello,

CMake 3.5.2 here.  Why explicitly setting the CMP0063 policy to NEW does 
not suppress the warning and actually use that new policy?  That is

if(POLICY CMP0063)
   cmake_policy(SET CMP0063 NEW)
endif()

and I still get

   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 of type "EXECUTABLE" has the following visibility
   properties set for CXX:

     CXX_VISIBILITY_PRESET
     VISIBILITY_INLINES_HIDDEN

   For compatibility CMake is not honoring them for this target.

Is this a bug?  Thanks in advance.

Regards,
Alexander