message: project: strip -Xclang <arg>
diff: @@ -90,6 +90,10 @@ struct ProjectProcessor {
  i++;
  return true;
  }
  + if (arg == "-Xclang") {
  + i++;
  + return true;
  + }
  return exclude_args.count(arg) ||
  any_of(exclude_globs,
  [&](const GlobPattern &glob) { return glob.match(arg); });
  