Bug#42592: failure to configure when spanning partitions

[Barak Pearlmutter <bap@cs.unm.edu>]

Package: gcc
Version: 1:2.95-2

Package: dpkg
Version: 1.4.1.6

Maybe the below failure is update-alternatives' fault, if so please
reassign this bug.

 # dpkg --status gcc
 Package: gcc
 Status: install ok half-configured

 # dpkg --configure gcc
 Setting up gcc (2.95-2) ...
 Checking available versions of cc, updating links in /etc/alternatives ...
 (You may modify the symlinks there yourself if desired - see `man ln'.)
 Renaming cc.1.gz slave link from /usr/man/man1/cc.1.gz to /usr/share/man/man1/cc.1.gz.
 update-alternatives: unable to rename /usr/man/man1/cc.1.gz to /usr/share/man/man1/cc.1.gz: Invalid cross-device link
 dpkg: error processing gcc (--configure):
  subprocess post-installation script returned error exit status 2
 Errors were encountered while processing:
  gcc

This is easily worked around with an

 # rm /usr/man/man1/cc.1.gz

which causes update-alternatives to create a new link in
/usr/share/man/man1/ rather than trying to move the old one.

Perhaps moving a symbolic link rather than generating a new one is an
unnecessary optimization, under the circumstances.