Source: linux Severity: important On s390x and m68k, gcc-4.8 is used which will not be released with stretch (#765380), so the severity of this bug will be bumped when we get closer to the release (m68k isn't RC of course).
On a related note, ia64 used gcc-4.6, which was removed from the archive a few days ago. Since ia64 has been dropped entirely and no porters are left in Debian, maybe simply drop it from the architectures list of src:linux? Cheers, Moritz