Finding packages affected by libtool13 -> libtool15 change?

[Kris Kennaway]

On Sun, Feb 26, 2006 at 03:30:52PM -0500, Chris Shenton wrote:
> Was updating a bunch of ports which suspiciously changed at once and
> I'm stuck in a prerequisite hell.  I checked /usr/ports/UPDATING and
> see: 
> 
>   20060223:
>     AFFECTS: all ports using libtool as part of the build process
>     ...
>     devel/libtool13 no longer exists.  devel/libtool15 has been modified
>     ...
>     The main visible change will be that a large number of ports have
>     had their plists modified (we now install libtool .la archives)
>     and, as such, PORTREVISIONS have been bumped on ~2000 ports (roughly
>     1/7th of the tree).
> 
>     Unfortunately, there is no simple upgrade path.  Short of removing
>     all packages and reinstalling from scratch, the only other viable
>     alternative would be careful use of portupgrade.  Given the large
>     number of different ways in which libtool is used by other ports
>     in the tree, this is a process that is likely to vary considerably
>     from system to system, and as such, folks should be very mindful
>     of running automatic updating software, such as portupgrade, making
>     extensive use of the -n flag (and equivalents for other updaters)
>     to see what will actually be rebuilt, before actually performing
>     the upgrade.
> 
> Ouch. Is there a way to see which existing ports will need rebuilding,
> and what order they should be rebuilt to get the dependencies right?
> 
> My trial-and-error approach to using portupgrade is very tedious and
> not very successful.   I didn't see anything I thought I could use in
> pkg_info and pkgdb. 

Start with portupgrade -a (or portupgrade -na) as the above
recommends, if you don't want to just blindly plunge in.

Kris
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