Re: [gentoo-user] dependencies - one more mystery novel

["Arttu V." <arttuv69@gmail.com>]

On 1/21/10, Helmut Jarausch <jarausch@igpm.rwth-aachen.de> wrote:
> Upgrading to media-libs/jpeg-8
> poses a new level of difficulty (to me).
>
> I cannot use  emerge @preserved-rebuild since I still
> have kde-3 packages and still have problems with the
> kde-sunset overlay which I have to resolve lateron.
>
> Now, I try to find out which packages depend on jpeg-7.
> First idea
> revdep-rebuild -p -L /usr/lib64/libjpeg.so.7
>
> but this also finds packages which depend on
>  /usr/lib64/libjpeg.so.7 AND /usr/lib64/libjpeg.so.8
> probably because they depend on /usr/lib64/libjpeg.so.7
> only indirectly.
>
> But how to find out these intermediate libraries which depend
> on /usr/lib64/libjpeg.so.7 directly?

I don't know why you wouldn't want to fix the kde3 overlay part ASAP,
but here is a guesswork, which might dig you something useful:

ls /usr/lib64/*.so | xargs -r scanelf -BF%n | grep 'libjpeg\.so\.7' |
awk '{ print $2 }' | xargs -r qfile -qC | uniq

It doesn't understand, e.g., slots, nor is really optimized. For such,
we'd need a separate program, which we'd call ... umm, lemme think ...
is reverse-dependency-rebuilder good? ;)

-- 
Arttu V.