Re: [gentoo-dev] Destroying dependancies...

[Per Wigren]

On Friday 28 March 2003 16:14, Alain Penders wrote:
> On Wed, Mar 26, 2003 at 01:39:31AM +0100, Per Wigren wrote:
> > Yesterday, for about 30 hours all my newly recieved mail went to
> > /dev/null because of a portage limitation...
> > I have an old computes which acts as a firewall/router, ftpserver
> > webserver and mailserver with IMAP and spamassassin...  I have "mysql" in
> > my USE-flags on said server..  Yesterday portage upgraded MySQL from
> > 3.23.56 to 4.0.12.. postfix and maildrop both linked to
> > /usr/lib/libmysqlclient.so.10 which went away when MySQL was upgraded..
> > When the still running postfix delivered the mail using dropmail,
> > dropmail just died with "error while loading shared libraries: no such
> > file or directory" and for some reason (I'd call it a bug in postfix) it
> > didn't defer them, they just went to /dev/null... Anyway, I won't whine
> > about it.. Instead I'm looking into finding a solution for the REAL
> > problem...
>
> The problem is that portage doesn't do reverse dependancy checking.  It
> needs to check that a package doesn't break another package that depends on
> it before doing an upgrade... and if it does break something, propose
> upgrading those packages as well.

But how do we check that with the current information?
To use the postfix-case above as an example..
Postfix works fine with both MySQL v3.x and MySQL v4.x.
If it is compiled against v3 it has to be recompiled if MySQL is upgraded from 
v3 to v4, but not if it is upgraded from v4.0.11 to v4.0.12..

To use MPlayer as another example..
MPlayer has to be recompiled EVERY TIME that DirectFB is upgraded, even minor 
version, because it links to .so.<complete versionnumber> ..  But it doesn't 
need to be recompiled if for example Vorbis is upgraded from v1.0.1 to v1.0.2 
or even v1.8.5 because it links to libvorbis.so.0 ...


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