How to detect LLVM Visual Studio Toolset on Windows?

Clang Frontend Using Clang
#1

We took a bug report for LLVM Visual Studio Toolset on Windows. It
appears LLVM defines _MSC_VER but it cannot consume the same programs
that Microsoft's compilers can. We now have to figure out a way to
detect Clang in this configuration and work around its shortcomings.

The "Getting Started with the LLVM System using Microsoft Visual
Studio" points us to the FAQ at http://llvm.org/docs/FAQ.html. The FAQ
does not discuss how to detect the configuration or the preprocessor
macros that are in effect.

How do we detect LLVM Visual Studio Toolset on Windows?

#2

Hi Jeffrey,

Have you tried checking for __clang__ ?

#3

Thanks Csaba.

The user stated the toolchain does not define some of the familiar
ones, like __clang__. From
http://github.com/weidai11/cryptopp/issues/147:

    This toolset defines MSC_VER as 1600
    __clang__ macro is not defined

I trying to get a dump of the preprocessor now to confirm it ('clang++
-dM -E - < NULL').

Jeff