thakis added a comment.

(I wish there was a flag that said "clang, never ever read any env vars 
please". Some people think that builds should be deterministic and not depend 
on random env vars people might have set (and then not do correct incremental 
rebuilds when the value of such env var flags change). But given that clang 
already reads a whole bunch of such env vars and we can always add such a flag 
later, I suppose this change doesn't make things that much worse.)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D119850/new/

https://reviews.llvm.org/D119850

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