[Patch] Add the __wchar_t type in MS-compatibility mode (PR15815)

[Hans Wennborg]

On Tue, Apr 23, 2013 at 2:48 PM, Richard Smith <richard at metafoo.co.uk> wrote:
> Does the setup code in ASTContext::InitBuiltinTypes do the right thing here?

Hmm, turns out it didn't.

I guess it's not obvious what the right thing is here. From
experimenting a bit, it seems that __wchar_t is always available, and
is always a distinct builtin type in visual studio, even in C.

New patch attached.

Thanks,
Hans
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