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[Ilmar Wilbers <ilmarw@xxxxxxxxx>]

When building Dolfin with enableDebug=0, I get the following error:
cc1plus: warnings being treated as errors
dolfin/io/NewXMLGraph.cpp: In static member function ‘static void 
dolfin::NewXMLGraph::write(const dolfin::Graph&, std::ostream&, 
dolfin::uint)’:
dolfin/io/NewXMLGraph.cpp:121: error: unused variable ‘edge_weights’
scons: *** [dolfin/io/NewXMLGraph.os] Error 1
scons: building terminated because of errors.
dolfin/io/NewXMLGraph.os failed: Error 1

This is probably because edge_weights is only used with an assertion:
dolfin_assert(edge_weights);
and this assertion not being made when debug mode is turned off.

ilmar