message: silence for-loop warning caught by clang
diff: @@ -247,7 +247,7 @@ namespace ospray {
  size_t childID=0;
  // find child ID
  - for (const auto nameAndValue : node.properties) {
  + for (const auto &nameAndValue : node.properties) {
  const auto &name = nameAndValue.first;
  const auto &value = nameAndValue.second;
  if (name == "child") {
  