From 918a5f1a6fc55384fdeddb7d03f8d81e18efe9a0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antonio=20S=C3=A1nchez?= <cantonios@google.com>
Date: Fri, 16 Jan 2026 19:47:14 +0000
Subject: [PATCH] Fix warnings related to variable_if_dynamic.

libeigen/eigen!2107

Closes #2807
---
 Eigen/src/Core/StlIterators.h   | 7 +++----
 Eigen/src/Core/util/XprHelper.h | 1 -
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/Eigen/src/Core/StlIterators.h b/Eigen/src/Core/StlIterators.h
index a24d4c236..c466aaf0e 100644
--- a/Eigen/src/Core/StlIterators.h
+++ b/Eigen/src/Core/StlIterators.h
@@ -335,10 +335,9 @@ class pointer_based_stl_iterator {
   typedef std::conditional_t<bool(is_lvalue), value_type*, const value_type*> pointer;
   typedef std::conditional_t<bool(is_lvalue), value_type&, const value_type&> reference;
 
-  pointer_based_stl_iterator() noexcept : m_ptr(0) {}
-  pointer_based_stl_iterator(XprType& xpr, Index index) noexcept : m_incr(xpr.innerStride()) {
-    m_ptr = xpr.data() + index * m_incr.value();
-  }
+  pointer_based_stl_iterator() noexcept : m_ptr(0), m_incr(XprType::InnerStrideAtCompileTime) {}
+  pointer_based_stl_iterator(XprType& xpr, Index index) noexcept
+      : m_ptr(xpr.data() + index * xpr.innerStride()), m_incr(xpr.innerStride()) {}
 
   pointer_based_stl_iterator(const non_const_iterator& other) noexcept : m_ptr(other.m_ptr), m_incr(other.m_incr) {}
 
diff --git a/Eigen/src/Core/util/XprHelper.h b/Eigen/src/Core/util/XprHelper.h
index a0e160eba..378c50179 100644
--- a/Eigen/src/Core/util/XprHelper.h
+++ b/Eigen/src/Core/util/XprHelper.h
@@ -153,7 +153,6 @@ struct promote_index_type {
 template <typename T, int Value>
 class variable_if_dynamic {
  public:
-  EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(variable_if_dynamic)
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit variable_if_dynamic(T v) {
     EIGEN_ONLY_USED_FOR_DEBUG(v);
     eigen_assert(v == T(Value));