big eigen2support fix, aimed at users who relied on internal eigen2 stuff: now we dont need customizations in test/eigen2/main.h anymore.

These tests already build:
eigen2_basicstuff
eigen2_adjoint
eigen2_linearstructure
eigen2_prec_inverse_4x4

Eigen/src/Core/MathFunctions.h

@@ -429,7 +429,11 @@ struct sqrt_default_impl<Scalar, true>
 {
   static inline Scalar run(const Scalar&)
   {
+#ifdef EIGEN2_SUPPORT
+    eigen_assert(!NumTraits<Scalar>::IsInteger);
+#else
     EIGEN_STATIC_ASSERT_NON_INTEGER(Scalar)
+#endif
     return Scalar(0);
   }
 };

Eigen/src/Core/NumTraits.h

@@ -69,6 +69,12 @@ template<typename T> struct GenericNumTraits
     AddCost = 1,
     MulCost = 1
   };
+  
+#ifdef EIGEN2_SUPPORT
+  enum {
+    HasFloatingPoint = !IsInteger
+  };
+#endif
 
   typedef T Real;
   typedef typename internal::conditional<