Do you have any news on this bug? It is severely affecting *all* GCC versions and prevents new versions of them from migrating to testing.
I tested it: system up-to-date jessie, with kfreebsd-image-10.0-1-amd64/10.0-4 chroot up-to-date sid, building of gcc-4.6 4.6.4-6 rebooted the system. It seems to be during test of "gcc unix/-m32". Petr