http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58572
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 32288 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32288&action=edit gcc49-pr58572.patch That didn't work for some reason (tried that just manually, after make bootstrap-lean did ln -sf {,prev-}x86_64-unknown-linux-gnu, but make install still failed when using g++ which doesn't grok -Wnarrowing and -Wno-narrowing (used a shell script wrapper around /usr/bin/g++ that rejected those options). But this patch worked, apparently libstdc++-v3 headers already use #pragma GCC system_header, so this patch shouldn't make a difference warning-wise, but it makes a difference for -MMD.
