[dwroberts]

Can you actually do cross compilation (on Linux host to win64 binary) with clang in the same way as MingW does out of the box though?

[okanat]

No. You cannot even do direct compilation on the same host and target with clang only.

LLVM doesn't come with the C library headers (VCRuntime) or the executable runtime startup code (VCStartup).Both of which are under Visual Studio proprietary licenses. So to use Clang on Windows without Mingw, you need Visual Studio.