https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83390
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> --- (In reply to Markus Trippelsdorf from comment #1) > Note that you need to use valgrind trunk for gcc trunk to avoid false > positives. > See: https://bugs.kde.org/show_bug.cgi?id=387766. I thought I was using latest valgrind, but I am not. Their svn development branch is months out of date. valgrind have moved over from svn to git and I didn't notice. I'll have a build of latest valgrind, latest gcc and report back in a few hours.