vsapsai added a comment.

In D61621#1497027 <https://reviews.llvm.org/D61621#1497027>, @rnk wrote:

> lgtm, thanks!
>
> In D61621#1496978 <https://reviews.llvm.org/D61621#1496978>, @vsapsai wrote:
>
> > Didn't use `-fms-compatibility` in the test and it seems to be working fine.
> >  Don't know if it is accidental and if I should add the flag.
>
>
> `-fms-extensions` is probably all you need. That's the one that defines 
> _MSC_VER.


Thanks for extra information and for the review. In my testing it was 
`-fms-compatibility-version` that defines `_MSC_VER` on macOS. I haven't tested 
extensively but looks like for the driver `-fms-extensions` should be enough 
but for -cc1 you need `-fms-compatibility-version`.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D61621/new/

https://reviews.llvm.org/D61621



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