Bug#808606: libgdal1i: circular dependency hell

[Sebastiaan Couwenberg]

Hi Bill,

Thanks for reporting this issue, we are well are of it, but there is no
good solution currently.

On 21-12-15 13:47, Bill Allombert wrote:
> There is a circular dependency between libgdal1i, liblwgeom-2.2-2,
> libopenscenegraph100v5, libsfcgal1 and libspatialite7:
> 
> libgdal1i 	:Depends: libspatialite7 (>= 4.2.0)
> liblwgeom-2.2-2 	:Depends: libsfcgal1 (>= 1.1.0)
> libopenscenegraph100v5 	:Depends: libgdal1i (>= 1.11.0)
> libsfcgal1 	:Depends: libopenscenegraph100v5
> libspatialite7 	:Depends: liblwgeom-2.2-2 (>= 2.1.0)
> 
> Complex circular dependencies are known to cause problems during upgrade, so we
> should try to avoid them.

The spatialite->postgis->gdal->spatialite circular dependency is mostly
problematic during geos transition on which all these packages depend.

spatialite depends on postgis for the topology features in liblwgeom,
these will be moved to a separate project (working title rt-topology)
[0], which will remove the spatialite dependency on postgis/liblwgeom.

With the new sfcgal dependency to enable 3D features in postgis we also
have: postgis->sfcgal->openscenegraph->gdal->spatialite->postgis.

Getting rid of liblwgeom dependency on spatialite should resolve that too.

I'm not aware of upgrade problems caused by the current situation, if
they exist and are common we should consider dropping the liblwgeom
dependency already and live with the reduced functionality. But as far
as I can tell that isn't the case.

[0] https://lists.osgeo.org/pipermail/postgis-devel/2015-October/025376.html

Kind Regards,

Bas

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