efriedma added a comment.

> In fact -mllvm is used extensively in a lot of lit/FileCheck tests, so that's 
> also going to cause problems.

I count 13 uses of -mllvm in driver commands in-tree, and some of those are 
actually testing the flag itself.  That doesn't seem like a lot.  (This is 
excluding uses in CHECK lines and "clang -cc1" invocations.)

> Possibly you missed that this flag is exempt from -Werror -- it _only_ prints 
> a warning, and is not an error, even when -Werror is specified.

If the warning isn't going to honor -Werror, you might as well not print it at 
all; for many projects, nobody reads the logs of a successful build.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55150/new/

https://reviews.llvm.org/D55150



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