rename Regression --> LeastSquares

Eigen/LeastSquares

@@ -0,0 +1,28 @@
+#ifndef EIGEN_REGRESSION_MODULE_H
+#define EIGEN_REGRESSION_MODULE_H
+
+#include "Core"
+
+#include "src/Core/util/DisableMSVCWarnings.h"
+
+#include "LU"
+#include "QR"
+#include "Geometry"
+
+namespace Eigen {
+
+/** \defgroup Regression_Module Regression module
+  * This module provides linear regression and related features.
+  *
+  * \code
+  * #include <Eigen/Regression>
+  * \endcode
+  */
+
+#include "src/Regression/Regression.h"
+
+} // namespace Eigen
+
+#include "src/Core/util/EnableMSVCWarnings.h"
+
+#endif // EIGEN_REGRESSION_MODULE_H

Eigen/Regression

@@ -1,28 +1,5 @@
-#ifndef EIGEN_REGRESSION_MODULE_H
-#define EIGEN_REGRESSION_MODULE_H
+#ifdef __GNUC__
+#warning "The Eigen/Regression header file has been renamed to Eigen/LeastSquares. The old name is deprecated, please update your code."
+#endif
 
-#include "Core"
-
-#include "src/Core/util/DisableMSVCWarnings.h"
-
-#include "LU"
-#include "QR"
-#include "Geometry"
-
-namespace Eigen {
-
-/** \defgroup Regression_Module Regression module
-  * This module provides linear regression and related features.
-  *
-  * \code
-  * #include <Eigen/Regression>
-  * \endcode
-  */
-
-#include "src/Regression/Regression.h"
-
-} // namespace Eigen
-
-#include "src/Core/util/EnableMSVCWarnings.h"
-
-#endif // EIGEN_REGRESSION_MODULE_H
+#include "LeastSquares"