Bug#652597: gcc-4.7-base trying to overwrite '/usr/lib/gcc/i486-linux-gnu/4.6.1'

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Package: gcc-4.7-base
Version: 4.7-20111217-1
Severity: important

gcc-4.6-base and gcc-4.7-base disagree on the target of the symlink:
lrwxrwxrwx root/root         0 2011-12-17 07:54 ./usr/lib/gcc/i486-linux-gnu/4.6.1 -> 4.6
lrwxrwxrwx root/root         0 2011-12-17 18:11 ./usr/lib/gcc/i486-linux-gnu/4.6.1 -> 4.7

This renders it uninstallable (without some --force options to dpkg), thereby
breaking quite a few packages that depend on it.

It looks like the symlink in the 4.7 package is a mistake.
(For now, I have forced 4.6-base to overwrite 4.7-base.)

(Severity not serious because I can't find an explicit "must"
or "required" in Debian policy mandating Conflicts: declarations.
Section 3.5 requires declaration of prerequisites, but I cannot
find an explicit requirement for conflicts.)