simple test program fails using 3rdparty Eigen library

[finkandreas]

I'm trying to compile this:

#include "KokkosBatched_Vector_SIMD.hpp"
#include "Eigen/Core"

int main() {
  return 0;
} 

The problem here is that KokkosBatched_Vector_SIMD.hpp moves a #include <immintrin.h> inside the KokkosBatched::Experimental namespace. Thus the include of Eigen/Core will result in an error, because it's also using intrinsic functions (which are now inside the namespace).
I would suggest that you move the include of the intrinsic functions outside of the namespace.

[hcedwar]

re #310, oops