Differential Revision: https://reviews.llvm.org/D124254
COFF Improvements
-----------------
-* Added autodetection of MSVC toolchain, a la clang-cl. Also added /winsysroot
- support for explicit specification of MSVC toolchain location.
+* Added autodetection of MSVC toolchain, a la clang-cl. Also added
+ ``/winsysroot:`` support for explicit specification of MSVC toolchain
+ location, similar to clang-cl's ``/winsysroot``. For now,
+ ``/winsysroot:`` requires also passing in an explicit ``/machine:`` flag.
(`D118070 <https://reviews.llvm.org/D118070>`_)
* ...