From ae1555f9ddcfcead9af0e73b608b58371a0e7472 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Mon, 16 Nov 2015 08:36:03 -0500
Subject: [PATCH] fix trilinos warning

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

diff --git a/source/lac/trilinos_precondition_ml.cc b/source/lac/trilinos_precondition_ml.cc
index df79ff867b..0b7d96eee9 100644
--- a/source/lac/trilinos_precondition_ml.cc
+++ b/source/lac/trilinos_precondition_ml.cc
@@ -183,6 +183,7 @@ namespace TrilinosWrappers
     if (constant_modes_dimension > 0)
       {
         const size_type global_size = n_global_rows(matrix);
+        (void)global_length; // work around compiler warning about unused function in release mode
         Assert (global_size ==
                 static_cast<size_type>(global_length(distributed_constant_modes)),
                 ExcDimensionMismatch(global_size,
-- 
2.39.5