[PATCH] D81156: [Support] Add stream tie function and use it for errs()

[Sam McCall via Phabricator via llvm-commits]

sammccall added a comment.

This is surprising and unsafe behaviour. Can we reconsider changing the default, at least until a more careful audit of the places errs() is used?
In particular, if errs is used from multiple threads (with a lock) and outs is used from a single thread (so no lock needed) then this introduces racy flushes to outs() concurrent with writes.


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  https://reviews.llvm.org/D81156/new/

https://reviews.llvm.org/D81156