a warning when do configure maybe caused by new version of cmake

[zpcxh95]

platform : windows 10
cmake version:3.5.0
Shogun version: 4.1.0

when I do configure shogun-4.1.0, cmake tell me that:

CMake Warning (dev) at cmake/FindCCache.cmake:15 (if):
Policy CMP0054 is not set: Only interpret if() arguments as variables or
keywords when unquoted. Run "cmake --help-policy CMP0054" for policy
details. Use the cmake_policy command to set the policy and suppress this
warning.

this is the policy CMP0054:

this is cmake/FindCCache.cmake

then I open PATH_SHOGUN/CMakeLists.txt, add:

  IF(POLICY CMP0054)
      CMAKE_POLICY(SET CMP0054 OLD)
      SET(CMAKE_POLICY_DEFAULT_CMP0054 OLD)
  ENDIF(POLICY CMP0054)

then the warning disappear