r315126 - Driver: hoist the `wchar_t` handling to the driver

[Reid Kleckner via cfe-commits]

On Wed, Oct 25, 2017 at 12:14 PM, Friedman, Eli <efriedma at codeaurora.org>
wrote:

> Maybe we should just ignore -fno-short-wchar, instead?  I think that's
> what gcc and released versions of clang do (that means -fno-short-wchar
> doesn't do anything for Windows targets, but that's probably fine).
>

No, the intention of this change was to make -fno-short-wchar do something
on Windows targets.
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