/// \macro LLVM_MSC_PREREQ
/// \brief Is the compiler MSVC of at least the specified version?
/// The common \param version values to check for are:
-/// * 1600: Microsoft Visual Studio 2010 / 10.0
/// * 1700: Microsoft Visual Studio 2012 / 11.0
/// * 1800: Microsoft Visual Studio 2013 / 12.0
#ifdef _MSC_VER
#define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
+
+// We require at least MSVC 2012.
+#if !LLVM_MSC_PREREQ(1700)
+#error LLVM requires at least MSVC 2012.
+#endif
+
#else
#define LLVM_MSC_PREREQ(version) 0
#endif