[pkg-fgfs-crew] Please gb fgrun against simgear-dev (2.0.0-4)

[Christopher Baines]

On Tue, 2011-08-02 at 17:39 +0100, Adam D. Barratt wrote:
> [simgear maintainer added to Cc]
> 
> On Tue, 2 Aug 2011 18:25:28 +0200, Kurt Roeckx wrote:
> > On Tue, Aug 02, 2011 at 01:19:59PM +0100, Adam D. Barratt wrote:
> >> On Tue, 02 Aug 2011 08:49:07 +0100, Christopher Baines wrote:
> >> >The maintainer for simgear has been updating parts of the library 
> >> for
> >> >the openscenegraph transition. However this appears to make fgrun
> >> >segfault (when built with simgear 2.0.0-2 at least).
> >> nmu fgrun . ALL . -m "Rebuild against simgear-dev 2.0.0-4 to fix
> >> segaults"
> >> dw fgrun . ALL . -m 'simgear-dev (>= 2.0.0-4)'
> >
> > It's not clear to me why this is a good idea.  Did simgear break
> > it's ABI?
> 
> The change in -4 only affects a private symbol, so shouldn't be an 
> issue.
> 
> There are indeed a few suspicious looking changes in -3 though:
> 
> -    virtual void forceLoad(osgDB::DatabasePager* dbp);
> +    virtual void forceLoad(osgDB::DatabasePager* dbp,
> +                           osg::NodePath& path);
> 
> for example.  My fault for only checking the latest changes :/
> 
> Adam

The reason for the changes to simgear is the release teams transition of
openscenegraph. The transition meant that if simgear could not build
against the new version of openscenegraph (3), it and its dependants
(flightgear, fgrun) would be removed from testing.

Simgear's maintainer, Ove, used the upstream source and backported the
relevant changes to allow simgear to build against the version of
openscenegraph entering testing. 

From the wikipedia description of ABI, I think openscenegraph broke its
ABI when it moved to the new major version (3), thus breaking simgear. 

Chris
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