You can now easily verify if Clang can compile your code on Windows:

Clang with Microsoft CodeGen in VS 2015 Update 1

by Dave Bartolomeo and the Clang/C2 feature crew

From the article:

One of the challenges with developing and maintaining cross-platform C++ code is dealing with different C++ compilers for different platforms. You write some code that builds fine with the Visual C++ compiler for your Windows-targeting build, but then your Android-targeting build breaks because Clang is stricter about standards conformance and your code was accidentally depending on Visual C++ being more permissive. Or, you write new code that builds successfully with Clang for iOS, only to find out that you used a relatively new C++ language feature that Visual C++ does not yet support, and now you have to either re-implement the code without using that language feature, or maintain a separate implementation that works with Visual C++ for your Windows build.

To make it easier to develop cross-platform code that works well for both Windows and other platforms, we’ve released an additional compiler toolset for Visual Studio called Clang with Microsoft CodeGen. This compiler uses the open-source Clang parser for C and C++, along with the code generator and optimizer from the Visual C++ compiler. This lets you compile your cross-platform code for Windows using the same Clang parser that you use for other targets, while still taking advantage of the advanced optimizations from the Visual C++ optimizer when you build for Windows. Because the new toolset uses the same Clang parser used for non-Windows targets, you won't need to have annoying #ifdefs throughout the code just to account for differences between the compilers. Also, your code can take advantage of language features that are not currently available in the Visual C++ compiler, including C99 complex types and C++14 extended constexpr support. And because the Clang-based compiler generates the same debug information format as the Visual C++ compiler, you'll still be able to debug your code with the same great Visual Studio debugger experience.