Hans Wennborg 091f1b6ef3 clang-cl: Warn about /U flags that look like filenames (PR31662) ...

Both on Mac and Windows, it's common to have a 'Users' directory in the
root of the filesystem, so one might specify a filename as
'/Users/me/myfile.c'. clang-cl (as well as MSVC's cl.exe) will interpret
that as invoking the '/U' option, which is probably not what the user
wanted. Add a warning about this.

Differential Revision: https://reviews.llvm.org/D29198

llvm-svn: 293305

2017-01-27 17:09:41 +00:00

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