mstorsjo added a comment.

In D151661#4379958 <https://reviews.llvm.org/D151661#4379958>, @Endill wrote:

> Thank you!
> I've asked Aaron what is the best way to check for MSVC-like triple before 
> relanding this test. So today we both learned.

Generally, the canonical way to check for it is `#ifdef _MSC_VER` - however in 
the `%clang_cc1` tests, it's not automatically defined. This, because the 
driver heuristically tries to guess a MSVC version to mimic, which it then 
passes as a version number to `clang -cc1` with `-fms-compatibility-version` or 
similar. When invoking `clang -cc1` manually, this doesn't get set and 
`_MSC_VER` is undefined. (I'm considering changing code to make sure that 
`_MSC_VER` always is defined in such cases too, even to a dummy version number 
.)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151661/new/

https://reviews.llvm.org/D151661

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