Fixed many MSVC warnings.

diff --git a/test/selfadjoint.cpp b/test/selfadjoint.cpp
index 2eaf6d4..1ea5a3a 100644
--- a/test/selfadjoint.cpp
+++ b/test/selfadjoint.cpp

@@ -55,7 +55,7 @@
 {
   for(int i = 0; i < g_repeat ; i++)
   {
-    EIGEN_UNUSED int s = ei_random<int>(1,20);
+    int s = ei_random<int>(1,20); EIGEN_UNUSED_VARIABLE(s);
 
     CALL_SUBTEST_1( selfadjoint(Matrix<float, 1, 1>()) );
     CALL_SUBTEST_2( selfadjoint(Matrix<float, 2, 2>()) );

diff --git a/unsupported/Eigen/FFT b/unsupported/Eigen/FFT
index a41a89a..0e8e57e 100644
--- a/unsupported/Eigen/FFT
+++ b/unsupported/Eigen/FFT

@@ -136,10 +136,12 @@
 
   int rows() const { return m_src.rows(); }
   int cols() const { return m_src.cols(); }
-  protected:
-      const T_SrcMat & m_src;
-      T_FftIfc & m_ifc;
-      int m_nfft;
+protected:
+  const T_SrcMat & m_src;
+  T_FftIfc & m_ifc;
+  int m_nfft;
+private:
+  fft_fwd_proxy& operator=(const fft_fwd_proxy&);
 };
 
 template<typename T_SrcMat,typename T_FftIfc> 
@@ -152,10 +154,12 @@
 
   int rows() const { return m_src.rows(); }
   int cols() const { return m_src.cols(); }
-  protected:
-      const T_SrcMat & m_src;
-      T_FftIfc & m_ifc;
-      int m_nfft;
+protected:
+  const T_SrcMat & m_src;
+  T_FftIfc & m_ifc;
+  int m_nfft;
+private:
+  fft_inv_proxy& operator=(const fft_inv_proxy&);
 };
 
 

diff --git a/unsupported/Eigen/src/BVH/BVAlgorithms.h b/unsupported/Eigen/src/BVH/BVAlgorithms.h
index 6372576..4032029 100644
--- a/unsupported/Eigen/src/BVH/BVAlgorithms.h
+++ b/unsupported/Eigen/src/BVH/BVAlgorithms.h

@@ -86,9 +86,11 @@
   bool intersectObject(const Object2 &obj) { return intersector.intersectObjectObject(stored, obj); }
   Object1 stored;
   Intersector &intersector;
+private:
+  ei_intersector_helper2& operator=(const ei_intersector_helper2&);
 };
 
-/**  Given two BVH's, runs the query on their cartesian product encapsulated by \a intersector.
+/**  Given two BVH's, runs the query on their Cartesian product encapsulated by \a intersector.
   *  The Intersector type must provide the following members: \code
      bool intersectVolumeVolume(const BVH1::Volume &v1, const BVH2::Volume &v2) //returns true if product of volumes intersects the query
      bool intersectVolumeObject(const BVH1::Volume &v1, const BVH2::Object &o2) //returns true if the volume-object product intersects the query
@@ -207,6 +209,8 @@
   Scalar minimumOnObject(const Object1 &obj) { return minimizer.minimumOnObjectObject(obj, stored); }
   Object2 stored;
   Minimizer &minimizer;
+private:
+  ei_minimizer_helper1& operator=(const ei_minimizer_helper1&) {}
 };
 
 template<typename Volume2, typename Object2, typename Object1, typename Minimizer>

diff --git a/unsupported/Eigen/src/NonLinearOptimization/HybridNonLinearSolver.h b/unsupported/Eigen/src/NonLinearOptimization/HybridNonLinearSolver.h
index aba31b2..0ef3eca 100644
--- a/unsupported/Eigen/src/NonLinearOptimization/HybridNonLinearSolver.h
+++ b/unsupported/Eigen/src/NonLinearOptimization/HybridNonLinearSolver.h

@@ -124,6 +124,8 @@
     Index ncfail;
     Scalar actred, prered;
     FVectorType wa1, wa2, wa3, wa4;
+
+    HybridNonLinearSolver& operator=(const HybridNonLinearSolver&);
 };
 
 

diff --git a/unsupported/Eigen/src/NonLinearOptimization/LevenbergMarquardt.h b/unsupported/Eigen/src/NonLinearOptimization/LevenbergMarquardt.h
index 63eb667..a8f3f3e 100644
--- a/unsupported/Eigen/src/NonLinearOptimization/LevenbergMarquardt.h
+++ b/unsupported/Eigen/src/NonLinearOptimization/LevenbergMarquardt.h

@@ -133,6 +133,8 @@
     Scalar delta;
     Scalar ratio;
     Scalar pnorm, xnorm, fnorm1, actred, dirder, prered;
+
+    LevenbergMarquardt& operator=(const LevenbergMarquardt&);
 };
 
 template<typename FunctorType, typename Scalar>

diff --git a/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h b/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h
index 8d23cb4..a25c9cd 100644
--- a/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h
+++ b/unsupported/Eigen/src/NumericalDiff/NumericalDiff.h

@@ -130,6 +130,8 @@
     }
 private:
     Scalar epsfcn;
+
+    NumericalDiff& operator=(const NumericalDiff&);
 };
 
 //vim: ai ts=4 sts=4 et sw=4

diff --git a/unsupported/test/NonLinearOptimization.cpp b/unsupported/test/NonLinearOptimization.cpp
index 0a609f7..c5dd084 100644
--- a/unsupported/test/NonLinearOptimization.cpp
+++ b/unsupported/test/NonLinearOptimization.cpp

@@ -8,6 +8,10 @@
 #include "main.h"
 #include <unsupported/Eigen/NonLinearOptimization>
 
+// This disables some useless Warnings on MSVC.
+// It is intended to be done for this test only.
+#include <Eigen/src/Core/util/DisableMSVCWarnings.h>
+
 int fcn_chkder(const VectorXd &x, VectorXd &fvec, MatrixXd &fjac, int iflag)
 {
     /*      subroutine fcn for chkder example. */