Re: MathGL: failure to load

[Jordi Gutiérrez Hermoso]

On 22 January 2012 16:53, CdeMills <address@hidden> wrote:
> mkoctfile-3.5.91+ -v mgl_octave.cpp -o mathgl.oct -I../../include
> -I../include -lmgl 2>&1 | tee mkoct.log
>
> Relevant part:
>
> g++-4.6 -c -fPIC -I${HOME}/usr/include/octave-3.5.91+/octave/..
> -I${HOME}/usr/include/octave-3.5.91+/octave -I${HOME}/usr/include -mieee-fp
> -I${HOME}/usr/include/freetype2 -I${HOME}/usr/include -I${HOME}/usr/include
> -g -O2 -I../../include -I../include mgl_octave.cpp -o mgl_octave.o
>
> g++-4.6 -shared -Wl,-Bsymbolic -o mathgl.oct mgl_octave.o -lmgl
> -L${HOME}/usr/lib/octave/3.5.91+ -L${HOME}/usr/lib -loctinterp -loctave
> -lcruft

Thanks, so at least the linking commands seem "correct".

Have you verified that libmgl.so does contain the correct symbols? If
you have GNU binutils installed, you should be able to do

    nm libmgl.so | grep mgl_data_value

When I run that command in what appears to be my libgml.so, I don't
see that symbol. Indeed, grepping through the source I only see a
declaration for it in include/mgl/data.h, but I can't find a
corresponding definition. I suspect this may be a bug in the 2.x
MathGL release.

So how are you able to compile mgl_octave.cpp? SWIG doesn't seem to
generate code for me that compiles. Did you do anything special to
handle the compilation step?

- Jordi G. H.