From 2b10be053ae49773118a8f52107ea65da445f5eb Mon Sep 17 00:00:00 2001
From: Axel Huebl <axel.huebl@plasma.ninja>
Date: Mon, 5 Apr 2021 12:55:56 -0700
Subject: Fix No-MPI Build Warning (#1870)

Fix unused variable warnings in no-MPI builds.
---
 Source/Utils/MPIInitHelpers.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'Source/Utils/MPIInitHelpers.cpp')

diff --git a/Source/Utils/MPIInitHelpers.cpp b/Source/Utils/MPIInitHelpers.cpp
index ccf28134c..e46127ee2 100644
--- a/Source/Utils/MPIInitHelpers.cpp
+++ b/Source/Utils/MPIInitHelpers.cpp
@@ -10,7 +10,6 @@
 #include <AMReX_ParallelDescriptor.H>
 #include <AMReX_Print.H>
 
-#include <string>
 #include <utility>
 
 
@@ -30,6 +29,8 @@ namespace utils
         thread_required = MPI_THREAD_MULTIPLE;
 #   endif
         MPI_Init_thread(&argc, &argv, thread_required, &thread_provided);
+#else
+        amrex::ignore_unused(argc, argv);
 #endif
         return std::make_pair(thread_required, thread_provided);
     }
@@ -52,6 +53,8 @@ namespace utils
                            << mtn(thread_provided) << ") is stricter than requested "
                            << mtn(thread_required) << "). This might reduce multi-node "
                            << "communication performance.";
+#else
+        amrex::ignore_unused(mpi_thread_levels);
 #endif
     }
 
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