From d65f6809921b11a4ef9b0842b80b4bfb3afc335f Mon Sep 17 00:00:00 2001
From: Peter Munch <peterrmuench@gmail.com>
Date: Wed, 21 Dec 2022 18:13:50 +0100
Subject: [PATCH] Fix warning

---
 source/lac/petsc_parallel_block_sparse_matrix.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/lac/petsc_parallel_block_sparse_matrix.cc b/source/lac/petsc_parallel_block_sparse_matrix.cc
index 4d0accae14..a290cfb602 100644
--- a/source/lac/petsc_parallel_block_sparse_matrix.cc
+++ b/source/lac/petsc_parallel_block_sparse_matrix.cc
@@ -35,6 +35,7 @@ namespace PETScWrappers
     BlockSparseMatrix::~BlockSparseMatrix()
     {
       PetscErrorCode ierr = destroy_matrix(petsc_nest_matrix);
+      (void)ierr;
       AssertNothrow(ierr == 0, ExcPETScError(ierr));
     }
 
-- 
2.39.5