Re: build liboctinterp.so without linking to libGL.so

[John W. Eaton]

On 07/28/2016 09:22 AM, Andreas Weber wrote:
> Hi all,
> is it possible to create a version of liboctinterp.so which doesn't link
> libGL.so? Or is it possible to remove the references to libGL.so after
> compilation? I tried this with "objcopy -N" but wasn't successful yet.
>
> I ask because it should be possible to create a external helper tool
> which loads a figure with hgload and then renders this using osmesa to a
> bitmap format or uses gl2ps to create vector formats. This should avoid
> the problem with proprietary drivers which aren't build on top of MESA
> (for example NVIDIA proprietary drivers).

Yes, we could avoid linking liboctinterp with libGL by dynamically 
loading the OpenGL library and calling the functions we need through 
function pointers instead of doing that directly.  Then (I think) we 
could load and unload OpenGL libraries as needed and switch between 
implementations.

But it would not solve the problem of having liboctgui linked with 
OpenGL libraries because we use libQtOpenGL and it links directly with 
libGL.

jwe