Re: [Openscenegraph-news] DynamicLibrary::failed loading

[Timothy P. <tim...@ya...>]

Hey Hugo :)

I suffer from this quite a bit! What usually fixes it from me is to
explicitly compile the rgb plugin (which isn't part of the default build I
think?) In visual studio its clickity click, but in nix I guess it would be
something like 'make osgdb_rgb'. I'll make a note about it in the faq... Oh
and before I go, how about putting it as part of make all? I know it
breaches the geniva convention in that its compiling not core components...
but it seems to build just fine and not require any downloads etc...


Tim.




----- Original Message -----
From: "Hugo van der Merwe" <hu...@ma...>
To: <ope...@li...>
Sent: Sunday, December 30, 2001 6:54 PM
Subject: [Openscenegraph-news] DynamicLibrary::failed loading


> I am playing a bit with Swig, Python, Demeter and OSG. I have taken the
> normal Demeter/OSG example, and called it from Python. It works great,
> except that the billboard-trees I'm supposed to see are white(?)
> rectangels. Here is the problem:
>
> DynamicLibrary::failed loading
/home/hugo/Programming/alonzo/osg-0.8.42/lib/osgPlugins/osgdb_rgb.so
> DynamicLibrary::error
/home/hugo/Programming/alonzo/osg-0.8.42/lib/osgPlugins/osgdb_rgb.so:
undefined symbol: instance__Q25osgDB8Registry
> Warning: Could not find plugin to read file with extension .rgba
> Warning: Unable to read file tree0.rgba
>
> What can be causing this? The way I link it? I am linking it as far as I
> can see, the same as the C++ version, which works fine:
>
> alonzo.so: alonzo.o alonzo_wrap.o HoverCamera.o
>         $(CXX) -shared alonzo.o alonzo_wrap.o HoverCamera.o -o
alonzo.so -L$(OSGHOME)/lib -LTerrain -L/usr/X11R6/lib -lDemeterOSG -losgDB -
losgUtil -lSDL_image -lSDL -lXxf86dga -lXxf86vm -lXv
> alonzo: alonzo.o HoverCamera.o
>         $(CXX) alonzo.o HoverCamera.o -o
alonzo -L$(OSGHOME)/lib -LTerrain -L/usr/X11R6/lib -lDemeterOSG -losgDB -los
gUtil -lSDL_image -lSDL -lXxf86dga -lXxf86vm -lXv
>
> alonzo target produces a perfectly working ELF executable. The alonzo.so
> target produces a .so that I import into Python using "import alonzo",
> then I run a single procedure that also gets called by main() in alonzo
> (a single procedure to limit the possible reasons for trouble), and then
> what I have above happens.
>
> It should be clear I don't really understand linking very well. (Still
> wondering when it is necessary to pass -fpic...) Any ideas where I can
> learn more to be able to solve this problem? What might the problem be?
> I think I might have to take this to a list related to interfacing
> Python with C++.
>
> Thanks in advance,
> Hugo van der Merwe
>
> _______________________________________________
> Openscenegraph-news mailing list
> Ope...@li...
> https://lists.sourceforge.net/lists/listinfo/openscenegraph-news


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