am 637eacfd: am 7911c8b9: (-s ours) am 15e549a8: am 4f5e6c63: Skip warnings for some unresolved references. [DO NOT MERGE]

* commit '637eacfdb4d2b499806f4a1b3b5ebab78b5f3bca':
  Skip warnings for some unresolved references. [DO NOT MERGE]