[PATCH] D29198: clang-cl: Warn about /U flags that look like filenames (PR31662)

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd accepted this revision.
compnerd added a comment.

Thanks for adding this, diagnosing what was going on here the first time around took a little bit of thinking.


https://reviews.llvm.org/D29198