failed to build llvm since 25de7691a0e27c29c8d783a22373cc

Hi Eric,
about the post created by you "Re: [llvm-dev] failed to build llvm since 25de7691a0e27c29c8d783a22373cc".
You said "Indeed, after a cleanup, errors gone. ". Could you let me know what kind of cleanup did you do? I encountered the same problem with you and did some clean, but the errors still there.
any suggestion is appreciated.