message: Do not emit warning if CM is not found
diff: @@ -66,14 +66,14 @@ if (GENX_ENABLED)
  find_program(CMC_EXECUTABLE NAMES cmc
  PATHS ${LLVM_TOOLS_BINARY_DIR} PATH_SUFFIXES bin NO_DEFAULT_PATH)
  if (NOT CMC_EXECUTABLE)
  - message(WARNING "Failed to find cmc" )
  + message(STATUS "Failed to find cmc" )
  endif()
  message(STATUS "CMC_EXECUTABLE: ${CMC_EXECUTABLE}")
  get_filename_component(CM_INSTALL_PATH ${CMC_EXECUTABLE} DIRECTORY)
  set(CM_INSTALL_PATH ${CM_INSTALL_PATH}/..)
  set(CM_INCLUDE_PATH ${CM_INSTALL_PATH}/include)
  if (NOT EXISTS ${CM_INCLUDE_PATH} OR NOT EXISTS ${CM_INCLUDE_PATH}/cm)
  - message(WARNING_ERROR "Cannot find path to CM library headers (CM_INCLUDE_PATH)")
  + message(STATUS "Cannot find path to CM library headers (CM_INCLUDE_PATH)")
  endif()
  message(STATUS "CM_INCLUDE_PATH: ${CM_INCLUDE_PATH}")
  set(CM_LIBRARY_PATH ${CM_INSTALL_PATH}/lib)
  