On Tue, Nov 5, 2013 at 7:26 AM, Dimitri Maziuk <dmaz...@bmrb.wisc.edu>wrote:
> On 2013-11-05 08:34, Craig James wrote:
>
> > I don't know if it's something specific to OpenBabel, or a more general
> > problem with C/C++. I have to believe it's OpenBabel, because I know
> > lots of projects use libraries written in C++ linked to executables
> > written in C.
>
> Generally speaking it requires writing an interface layer: wrapping code
> that throws exceptions, declaring objects as structs, declaring
> everything 'extern C', etc.
>
Of course. Any C/C++ programmer knows that, and that's what swig is all
about. The problem is much more subtle -- it seems to be that the run-time
linker doesn't call the C++ constructors correctly for OpenBabel's
plug-ins. I believe it has to do with plug-ins within plug-ins. That is,
Perl dynamically loads the OpenBabel swig-generated wrappers, which works
correctly; all the class load-time code initializers are run. But then
when OpenBabel tries to dynamically load its own libraries (the file
modules like mdlformat.cpp), it fails to call all of the constructors
and/or initialization code, so the classes aren't initialized properly.
But that's just the best I've been able to deduce from the symptoms. It
could be something else. All I know for sure is that I couldn't get it to
work, and several others also tried and failed.
Craig
>
> Dima
>
>
>
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