message: Suppress a warning about unused static function in non-debug mode.
diff: @@ -322,6 +322,7 @@ bool operator<(const ParNCMesh::CommGroup &lhs, const ParNCMesh::CommGroup &rhs)
  return lhs.size() < rhs.size();
  }
  +#ifdef MFEM_DEBUG
  static bool group_sorted(const ParNCMesh::CommGroup &group)
  {
  for (unsigned i = 1; i < group.size(); i++)
  @@ -330,6 +331,7 @@ static bool group_sorted(const ParNCMesh::CommGroup &group)
  }
  return true;
  }
  +#endif
  ParNCMesh::GroupId ParNCMesh::GetGroupId(const CommGroup &group)
  {
  