AW: [Qgis-developer] Library linking problems when release changes - eg. 1.9 --> 1.8

[Matthias Kuhn]

Hi,

To my understanding, the folder /usr/local is to be used for locally
compiled programs and is therefore not set by default by distributions.

That qgis is installed into this folder is defined by
CMAKE_INSTALL_PREFIX which defaults to /usr/local but can easily be
replaced with /usr so it will work without changing the default path. If
you are releasing a package, that's the way to go.

On your development machine you might want to run a stock version of
qgis and a self-compiled one, so you don't want to install the second
ont into /usr as well. In this case you can either export
LD_LIBRARY_PATH (include in .bash_profile to set it automatically) or
you can add the path it in /etc/ld.so.conf (add a file
to /etc/ld.so.conf.d if supported by your distro).

Regards,
Matthias

On Fri, 2012-05-25 at 09:38 +0200, Andreas Neumann wrote:
> Thanks Stefan and Kimaidou
> 
>  Setting LD_LIBRARY_PATH seems to work. It is strange. I was assuming 
>  that /usr/local/lib was searched by default anyway. After all this is 
>  the directory for libraries (next to /usr/lib )
> 
>  Well - always some mysteries we can't understand ...
> 
>  Thanks for helping me to solve the problem,
>  Andreas
> 
>  On Fri, 25 May 2012 07:30:13 +0000, Ziegler Stefan wrote:
> > Hi Andi
> >
> > I solved it by exporting LD_LIBRARY_PATH:
> >
> > export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
> >
> > It's a bit strange since I think it used to work without this....
> >
> > Regards
> > Stefan
> >
> >> -----Ursprüngliche Nachricht-----
> >> Von: qgis-developer-bounces at lists.osgeo.org [mailto:qgis-developer-
> >> bounces at lists.osgeo.org] Im Auftrag von Andreas Neumann
> >> Gesendet: Freitag, 25. Mai 2012 09:25
> >> An: qgis-developer
> >> Betreff: [Qgis-developer] Library linking problems when release 
> >> changes - eg. 1.9 -->
> >> 1.8
> >>
> >>  Hi,
> >>
> >>  Whenever there is a change in the major version of QGIS, e.g. 1.7 
> >> to
> >>  1.9 and most recently the switch back from 1.9 to 1.8 I am running 
> >> into  problems.
> >>
> >>  The compile runs fine but when I try to start it I get this 
> >> message:
> >>  error while loading shared libraries: libqgis_core.so.1.8.0: cannot 
> >> open shared object
> >> file: No such file or directory
> >>
> >>
> >>  But the libqgis_core.so.1.8.0 is present in /usr/local/lib
> >>
> >>  I removed the build directory and ran ccmake .. and cmake .. again, 
> >> but
> >>  it doesn't solve this problem that it can't find the library that
> >>  obviously is present and recent on my machine.
> >>
> >>  I would very much appreciate if someone could help me out here.
> >>
> >>  Thanks a lot,
> >>  Andreas
> >>
> >> --
> >>  --
> >>  Andreas Neumann
> >>  Böschacherstrasse 10A
> >>  8624 Grüt (Gossau ZH)
> >>  Switzerland
> >> _______________________________________________
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> >> Qgis-developer at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>