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-fms-compatibility-version defaults to VS 2013. When using VS 2015, this will lead to compilation failures of the test inferiors in the C++ standard library for language conformance reasons. The fix here is to simply pass -fms-compatibility-version=19.0 when we detect that a VS 2015 compiler is present. Even though we're actually using clang to do the compilation, clang uses this same detection algorithm to determine the location of the standard library. So this check is tantanmount to saying "If clang is going to find MSVC 2015's standard library, then pass 19.0 for -fms-compatibility-version. llvm-svn: 253589