I committed a patch that makes any warnings compile errors (and fixes the irritating DISABLE_COPY_AND_ASSIGN warning that had crept into the build). Currently this only applies to the debug build, so GVMs will fail if a patch introduces compile warnings. Release and ASAN will come later, but have been left out for now.
Let me know if you run into any issues with the change: it can be irritating to have to fix compile warnings when you are iterating on code, but I think it's worth it to have clean compiles. - Tim
