http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51755
--- Comment #2 from James Kanze <james.kanze at gmail dot com> 2012-01-05 08:45:22 UTC --- I'd miss PR 51294. My report is almost certainly a duplicate of this one. It's a minor bug, in that it only affects warnings, but it does make -Wconversion unusable in certain contexts.