LP:645171 - Compiler warnings when compiling oqgraph in maria-5.2

When compiling oqgraph in maria-5.2, GCC 4.4.4 reports the following warnings:

In file included from /usr/lib/gcc/i686-redhat-linux/4.4.4/../../../../include/c++/4.4.4/backward/hash_set:60,
from /usr/include/boost/graph/adjacency_list.hpp:25,
from graphcore.cc:40:
/usr/lib/gcc/i686-redhat-linux/4.4.4/../../../../include/c++/4.4.4/backward/backward_warning.h:28:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated.
In file included from graphcore.cc:41:
graphcore.cc: In function ‘void boost::breadth_first_visit(const IncidenceGraph&, typename boost::graph_traits<Graph>::vertex_descriptor, Buffer&, BFSVisitor, ColorMap) [with IncidenceGraph = boost::adjacency_list<boost::vecS, boost::vecS, boost::bidirectionalS, open_query::VertexInfo, open_query::EdgeInfo, boost::no_property, boost::listS>, Buffer = boost::queue<unsigned int, std::deque<unsigned int, std::allocator<unsigned int> > >, BFSVisitor = boost::bfs_visitor<std::pair<boost::predecessor_recorder<boost::iterator_property_map<__gnu_cxx::__normal_iterator<unsigned int*, std::vector<unsigned int, std::allocator<unsigned int> > >, boost::vec_adj_list_vertex_id_map<boost::property<boost::vertex_bundle_t, open_query::VertexInfo, boost::no_property>, unsigned int>, unsigned int, unsigned int&>, boost::on_tree_edge>, open_query::oqgraph_goal<false, boost::on_discover_vertex> > >, ColorMap = boost::two_bit_color_map<boost::vec_adj_list_vertex_id_map<boost::property<boost::vertex_bundle_t, open_query::VertexInfo, boost::no_property>, unsigned int> >]’:
graphcore.cc:208: warning: dereferencing pointer ‘p’ does break strict-aliasing rules
/usr/include/boost/optional/optional.hpp:593: note: initialized from here
graphcore.cc:208: warning: dereferencing pointer ‘p’ does break strict-aliasing rules
/usr/include/boost/optional/optional.hpp:593: note: initialized from here