[PATCH] D131465: C++/ObjC++: switch to gnu++17 as the default standard

[Hans Wennborg via Phabricator via cfe-commits]

hans added a comment.

> If we're all using `clang` for the command, we'd all get the same behavior, right? There's no expectation that `clang` and `cl` behave the same way, that's what `clang-cl` is for. I guess I don't see why we care about how MSVC behaves unless passing `-fms-compatibility` or using `clang-cl` as the driver and so I don't see why MSVC should dictate our behavior. (e.g., using clang and libc++ on Windows because the programmer doesn't want to use MSVC at all [except for the C runtime, I suppose] is something I believe we want to support, and with such a use case, defaulting to what MSVC defaults to seems surprising to me without other motivation.)

Okay, should we key this off the driver mode then (clang-cl vs clang), or on the `-fms-compatibility` version?


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