message: Force enable deprecation attributes
diff: @@ -40,6 +40,16 @@ else()
  message(WARNING "Unknown compiler... recklessly proceeding without a version check")
  endif()
  +# All of our target compilers support the deprecated
  +# attribute. Normally, we would just let the GenerateExportHeader
  +# subsystem do this via configure check, but there appears to be a
  +# CMake bug where if -Werror is set on the command line, it breaks the
  +# configure check, and we end up not configuring the macro. That means
  +# that we end up not being able to turn deprecation warnings into
  +# errors. Instead, since we know all our platforms offer the feature,
  +# just hard enable it here.
  +set (COMPILER_HAS_DEPRECATED_ATTR true)
  +
  set (CMAKE_SKIP_BUILD_RPATH false)
  set (CMAKE_BUILD_WITH_INSTALL_RPATH false)
  set (CMAKE_INSTALL_RPATH_USE_LINK_PATH true)
  