Patch by Kenneth Riddile: disable MSVC warnings, reenable them outside

of Eigen, and add a MSVC-friendly path in StaticAssert.

Eigen/Array

@@ -3,6 +3,8 @@
 
 #include "Core"
 
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 namespace Eigen {
 
 /** \defgroup Array Array module
@@ -32,4 +34,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_ARRAY_MODULE_H

Eigen/Cholesky

@@ -3,6 +3,8 @@
 
 #include "Core"
 
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 // Note that EIGEN_HIDE_HEAVY_CODE has to be defined per module
 #if (defined EIGEN_EXTERN_INSTANTIATIONS) && (EIGEN_EXTERN_INSTANTIATIONS>=2)
   #ifndef EIGEN_HIDE_HEAVY_CODE
@@ -57,4 +59,6 @@ namespace Eigen {
 } // namespace Eigen
 #endif
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_CHOLESKY_MODULE_H

Eigen/Core

@@ -2,8 +2,8 @@
 #define EIGEN_CORE_H
 
 // first thing Eigen does: prevent MSVC from committing suicide
+#include "src/Core/util/DisableMSVCWarnings.h"
 #ifdef _MSC_VER
-  #pragma warning( disable : 4181 4244 )
   #if (_MSC_VER >= 1500) // 2008 or later
     // Remember that usage of defined() in a #define is undefined by the standard
     #ifdef _M_IX86_FP
@@ -144,4 +144,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_CORE_H

Eigen/Geometry

@@ -1,6 +1,10 @@
 #ifndef EIGEN_GEOMETRY_MODULE_H
 #define EIGEN_GEOMETRY_MODULE_H
 
+#include "Core"
+
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 #include "Array"
 #include <limits>
 
@@ -39,4 +43,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_GEOMETRY_MODULE_H

Eigen/LU

@@ -3,6 +3,8 @@
 
 #include "Core"
 
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 namespace Eigen {
 
 /** \defgroup LU_Module LU module
@@ -22,4 +24,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_LU_MODULE_H

Eigen/QR

@@ -2,6 +2,9 @@
 #define EIGEN_QR_MODULE_H
 
 #include "Core"
+
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 #include "Cholesky"
 
 // Note that EIGEN_HIDE_HEAVY_CODE has to be defined per module
@@ -62,4 +65,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_QR_MODULE_H

Eigen/Regression

@@ -1,6 +1,10 @@
 #ifndef EIGEN_REGRESSION_MODULE_H
 #define EIGEN_REGRESSION_MODULE_H
 
+#include "Core"
+
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 #include "LU"
 #include "QR"
 #include "Geometry"
@@ -19,4 +23,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_REGRESSION_MODULE_H

Eigen/SVD

@@ -3,6 +3,8 @@
 
 #include "Core"
 
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 namespace Eigen {
 
 /** \defgroup SVD_Module SVD module
@@ -19,4 +21,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_SVD_MODULE_H

Eigen/Sparse

@@ -2,6 +2,9 @@
 #define EIGEN_SPARSE_MODULE_H
 
 #include "Core"
+
+#include "src/Core/util/DisableMSVCWarnings.h"
+
 #include <vector>
 #include <map>
 #include <cstdlib>
@@ -102,4 +105,6 @@ namespace Eigen {
 
 } // namespace Eigen
 
+#include "src/Core/util/EnableMSVCWarnings.h"
+
 #endif // EIGEN_SPARSE_MODULE_H

Eigen/src/Core/util/StaticAssert.h

@@ -74,8 +74,20 @@
       };
     };
 
-    #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
-      if (Eigen::ei_static_assert<CONDITION ? true : false>::MSG) {}
+    // Specialized implementation for MSVC to avoid "conditional
+    // expression is constant" warnings.  This implementation doesn't
+    // appear to work under GCC, hence the multiple implementations.
+    #ifdef _MSC_VER
+
+      #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
+        {Eigen::ei_static_assert<CONDITION ? true : false>::MSG;}
+
+    #else
+
+      #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
+        if (Eigen::ei_static_assert<CONDITION ? true : false>::MSG) {}
+
+    #endif
 
   #endif // not CXX0X
 

Eigen/src/Geometry/Quaternion.h

@@ -279,7 +279,7 @@ inline Quaternion<Scalar>& Quaternion<Scalar>::operator=(const Quaternion& other
 template<typename Scalar>
 inline Quaternion<Scalar>& Quaternion<Scalar>::operator=(const AngleAxisType& aa)
 {
-  Scalar ha = 0.5*aa.angle();
+  Scalar ha = Scalar(0.5)*aa.angle(); // Scalar(0.5) to suppress precision loss warnings
   this->w() = ei_cos(ha);
   this->vec() = ei_sin(ha) * aa.axis();
   return *this;