From 6422efa5c9fc1c87aabc0e4d39ec04885b5038be Mon Sep 17 00:00:00 2001
From: Martin Kronbichler <martin.kronbichler@uni-a.de>
Date: Sun, 18 Sep 2022 16:01:31 +0200
Subject: [PATCH] Avoid warning regarding uninitialized variable

---
 include/deal.II/lac/tensor_product_matrix.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/lac/tensor_product_matrix.h b/include/deal.II/lac/tensor_product_matrix.h
index 8734f694a2..14f7e023b1 100644
--- a/include/deal.II/lac/tensor_product_matrix.h
+++ b/include/deal.II/lac/tensor_product_matrix.h
@@ -341,7 +341,8 @@ namespace internal
           std::array<Table<2, Number>, dim> &      eigenvectors,
           std::array<AlignedVector<Number>, dim> & eigenvalues)
     {
-      const int n_rows_1d = mass_matrices[0].n_cols();
+      const unsigned int n_rows_1d = mass_matrices[0].n_cols();
+      (void)n_rows_1d;
 
       for (unsigned int dir = 0; dir < dim; ++dir)
         {
@@ -376,7 +377,7 @@ namespace internal
           std::array<Table<2, VectorizedArray<Number>>, dim> &eigenvectors,
           std::array<AlignedVector<VectorizedArray<Number>>, dim> &eigenvalues)
     {
-      const int              n_rows_1d   = mass_matrix[0].n_cols();
+      const unsigned int     n_rows_1d   = mass_matrix[0].n_cols();
       constexpr unsigned int macro_size  = VectorizedArray<Number>::size();
       const std::size_t nm_flat_size_max = n_rows_1d * n_rows_1d * macro_size;
       const std::size_t n_flat_size_max  = n_rows_1d * macro_size;
-- 
2.39.5