Re: [gentoo-user] Re: guvcview update produces an executable with missing lib...

[Meino.Cramer@gmx.de]

Kai Krakow <hurikhan77@gmail.com> [16-09-02 03:52]:
> Am Tue, 30 Aug 2016 03:55:32 +0200
> schrieb Meino.Cramer@gmx.de:
> 
> > Daniel Frey <djqfrey@gmail.com> [16-08-30 03:48]:
> > > On 08/29/2016 11:11 AM, waltdnes@waltdnes.org wrote:  
> > > > On Mon, Aug 29, 2016 at 06:29:50PM +0200, Meino.Cramer@gmx.de
> > > > wrote  
> >  [...]  
> >  [...]  
> >  [...]  
> > > > 
> > > >   The first suggestion in a case like this is to run
> > > > revdep-rebuild.  As a matter of fact, it probably wouldn't hurt
> > > > to run revdep-rebuild after every update.
> > > >   
> > > 
> > > Yes, I do. Portage occasionally misses a rebuild. It's a lot better
> > > now at catching them but it still misses them.
> > > 
> > > 
> > > 
> > > Dan
> > >   
> > 
> > Ok, we now know that depclean and redep rebuild are needed after each
> > update. It is someting, which I put together into one script which 
> > I run after each update.
> > 
> > And we know that portage seems to be guilty. And that it should not be
> > guilty. And that it does better in this cases.
> > 
> > One thing remains:
> > How can I get that guvcview up and running?
> 
> Try "emerge -1a @preserved-rebuild". It should catch preserved libs
> that revdep-rebuild cannot see at missing but doesn't scan neither
> because it doesn't consider them as part of the installed files.
> 
> Usually, after rebuilding everything to new metadata, you no longer use
> revdep-rebuild because the preserved-libs feature renders it mostly
> useless. Instead, @preserved-rebuild jumps in to rebuild and cleanup.
> 
> You may, however, catch a situation where the configure phase detects
> the new version of a lib but the linker phase uses the preserved lib of
> an older version of a dependent package. I'd consider this a bug of the
> ebuild or the package's build system usually. The way out here is do
> forcefully uninstall the package with the "broken" preserved lib, then
> reinstall what is not working.
> 
> It'd try this:
> 
> # Try to unmerge the package that portage thinks the file belongs to:
> $ emerge -Ca /usr/lib/libgviewv4l2core-1.0.so.1
> (or whereever this file should be, you can use pfl for finding out)
> 
> # rebuild binary broken packages now (we used -C, not -c)
> $ revdep-rebuild
> 
> # rebuild packages using preserved libs
> $ emerge -1a @preserved-rebuild
> 
> # rebuild your package now, it should now link to the correct lib
> $ emerge -1a guvcview
> 
> If that still doesn't help, try "qcheck -BHTP" to find packages with
> missing files. Rebuild those:
> 
> $ emerge -1a $(qcheck -BHTP)
> 
> If that also doesn't help, pretend that no dependencies are installed -
> this may rebuild A LOT of packages:
> 
> $ emerge -1e guvcview
> 
> -- 
> Regards,
> Kai
> 
> Replies to list-only preferred.
> 
> 

Hi Kai,

thank you very much for your useful help!!! :) 8)

This procedure finally fixed that problem.
I saved your posting to my "HowTo"s... :)

Have a nice weekend!
Best regards,
Meino