The intrin.h header needs to be included after cmath in order to prevent warnigns.

Fixed (hopefully) final Index realted warnings.

Eigen/Core

@@ -118,10 +118,6 @@
   #endif
 #endif
 
-#ifdef _MSC_VER
-  #include <intrin.h> // required for __cpuid
-#endif
-
 #if (defined _OPENMP) && (!defined EIGEN_DONT_PARALLELIZE)
   #define EIGEN_HAS_OPENMP
 #endif
@@ -148,6 +144,11 @@
 #include<iostream>
 #endif
 
+// required for __cpuid, needs to be included after cmath
+#ifdef _MSC_VER
+  #include <intrin.h>
+#endif
+
 #if (defined(_CPPUNWIND) || defined(__EXCEPTIONS)) && !defined(EIGEN_NO_EXCEPTIONS)
   #define EIGEN_EXCEPTIONS
 #endif