Would one of you C++ experts help me out with a polymake build failure with gcc 6? Polymake defines a Vector class in lib/core/include/Vector.h (also see lib/core/include/GenericVector.h). Unlike with gcc 5 and earlier, everywhere in the code that something like this is done:
Vector<int> x = ...;
Vector<int> y = ..;
const Vector<int> z = x + y;
where + can be one of several operators defined for the Vector class, gcc errors like this:
error: invalid initialization of non-const reference of type 'pm::Vector<int>&' from an rvalue of type 'pm::Vector<int>'
I assume the error refers to the temporary created by the operator. I've added -std=gnu++98 to CXXFLAGS, but that doesn't help. I guess that the Vector class is missing something needed by gcc 6, but I don't know what that something might be. Any hints are much appreciated.
See http://koji.fedoraproject.org/koji/taskinfo?taskID=12969245 for an example build showing the error.
Thank you,
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