erichkeane added a comment.
In https://reviews.llvm.org/D45383#1069057, @efriedma wrote:
> I don't see an `A` in `LANGBUILTIN(__va_start, "vc**.", "nt",
Ah, you're right! I was confusing it with LIBBUILTIN(va_start, "vA.", "fn",
"stdarg.h", ALL_LANGUAGES) and BUILTIN(__builtin_va_start, "vA.", "nt").
It seems that the MS builtins dont' actually use 'A'. I'll implement your
suggestion, thanks for your patience :)
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