Don't add EIGEN_DEVICE_FUNC to random() since ::rand is not available in Cuda.

Eigen/src/Core/MathFunctions.h

diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index cca968d..a681a3e 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -700,18 +700,16 @@
   typedef Scalar type;
 };
 
-template<typename Scalar> EIGEN_DEVICE_FUNC inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random(const Scalar& x, const Scalar& y);
-template<typename Scalar> EIGEN_DEVICE_FUNC inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random();
+template<typename Scalar> inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random(const Scalar& x, const Scalar& y);
+template<typename Scalar> inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random();
 
 template<typename Scalar>
 struct random_default_impl<Scalar, false, false>
 {
-  EIGEN_DEVICE_FUNC
   static inline Scalar run(const Scalar& x, const Scalar& y)
   {
     return x + (y-x) * Scalar(std::rand()) / Scalar(RAND_MAX);
   }
-  EIGEN_DEVICE_FUNC
   static inline Scalar run()
   {
     return run(Scalar(NumTraits<Scalar>::IsSigned ? -1 : 0), Scalar(1));
@@ -768,7 +766,6 @@
 template<typename Scalar>
 struct random_default_impl<Scalar, false, true>
 {
-  EIGEN_DEVICE_FUNC
   static inline Scalar run(const Scalar& x, const Scalar& y)
   {
     if (y <= x)
@@ -796,7 +793,6 @@
     return Scalar(ScalarX(x) + offset);
   }
 
-  EIGEN_DEVICE_FUNC
   static inline Scalar run()
   {
 #ifdef EIGEN_MAKING_DOCS
@@ -815,13 +811,11 @@
 template<typename Scalar>
 struct random_default_impl<Scalar, true, false>
 {
-  EIGEN_DEVICE_FUNC
   static inline Scalar run(const Scalar& x, const Scalar& y)
   {
     return Scalar(random(x.real(), y.real()),
                   random(x.imag(), y.imag()));
   }
-  EIGEN_DEVICE_FUNC
   static inline Scalar run()
   {
     typedef typename NumTraits<Scalar>::Real RealScalar;
@@ -830,14 +824,12 @@
 };
 
 template<typename Scalar>
-EIGEN_DEVICE_FUNC
 inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random(const Scalar& x, const Scalar& y)
 {
   return EIGEN_MATHFUNC_IMPL(random, Scalar)::run(x, y);
 }
 
 template<typename Scalar>
-EIGEN_DEVICE_FUNC
 inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random()
 {
   return EIGEN_MATHFUNC_IMPL(random, Scalar)::run();
@@ -1814,7 +1806,6 @@
 
 template<> struct random_impl<bool>
 {
-  EIGEN_DEVICE_FUNC
   static inline bool run()
   {
     return random<int>(0,1)==0 ? false : true;