enable_language(CXX)

cmake_policy(GET CMP0117 cmp0117)
if(cmp0117 STREQUAL "NEW")
  if(" ${CMAKE_CXX_FLAGS} " MATCHES " ([/-]GR) ")
    message(SEND_ERROR "CMAKE_CXX_FLAGS has '${CMAKE_MATCH_1}' under NEW behavior")
  endif()
else()
  if(NOT " ${CMAKE_CXX_FLAGS} " MATCHES " /GR ")
    message(SEND_ERROR "CMAKE_CXX_FLAGS does not have '/GR' under OLD behavior")
  endif()
endif()