[Paraview] dlopen question

[Takuya OSHIMA]

Hi Mattijs,

If I'm not wrong it's in ParaView3/VTK/Utilities/kwsys/DynamicLoader.cxx.

Takuya OSHIMA, Ph.D.
Faculty of Engineering, Niigata University
8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN

From: Mattijs Janssens <m.janssens at opencfd.co.uk>
Subject: Re: [Paraview] dlopen question
Date: Mon, 29 Sep 2008 10:41:18 +0100

> Thanks Takuya,
> 
> the thing I picked up from that discussion is to use RTLD_GLOBAL. Do you know 
> which routine is doing the dlopen inside Paraview - would like to trace what 
> is happening.
> 
> Regards,
> 
> Mattijs
> 
> On Wednesday 24 September 2008 04:36, Takuya OSHIMA wrote:
> > Hi Mattijs,
> >
> > Not sure if this helps, but interestingly a VisIt guy had a very
> > similar problem around a week ago. You can follow the discussion by
> > searching for "help with dlopen" in
> > https://email.ornl.gov/pipermail/visit-developers/2008-September/thread.htm
> >l .
> >
> > The caveat is that he says RTLD_LAZY|RTLD_GLOBAL solved the problem
> > while apparently not in this case...
> >
> > Takuya OSHIMA, Ph.D.
> > Faculty of Engineering, Niigata University
> > 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN
> >
> >
> > From: Mattijs Janssens <m.janssens at opencfd.co.uk>
> > Subject: [Paraview] dlopen question
> > Date: Mon, 22 Sep 2008 10:22:49 +0100
> >
> > > In our code we use dlopen with RTLD_LAZY|RTLD_GLOBAL to optionally load
> > > additional libraries.
> > >
> > > We noticed that this gives problems in the paraview reader. The same code
> > > which happily loads when running from the command line now gives
> > > undefined symbols when used through the reader.
> > >
> > > E.g. the additional library libAdditional uses a symbol aaa from library
> > > libmain which is already a dependency of my application. (so 'ldd
> > > application' shows up libmain). My application does a dlopen of
> > > libAdditional and it all works fine.
> > >
> > > Now when invoked in a reader (the reader itself I assume is loaded using
> > > dlopen into Paraview?) the dlopen of libAdditional complains about
> > > unresolved symbol aaa. Funnily enough it works if we first do a dlopen of
> > > libmain and then of libAdditional.
> > >
> > > Is this related to the flags passed into dlopen? To complicate the
> > > matter, from what we heard, the problem does not appear on OSX.
> > >
> > > Regards,
> > >
> > > Mattijs
> > >
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