Re: the nvidia/osmesa dilema

[Andreas Weber]

On 04.05.2016 12:36, Juan Pablo Carbajal wrote:
> We still have this issue with building the documentation and running
> tests (https://savannah.gnu.org/bugs/?44478) that casues segfaults
> when the user is running with nvidia drivers.

Hi all,
I've been playing around with jwe's idea to create an external filter 
program which renders the plot and isn't linked with libGL.

Can someone explain why this simple code works with proprietary nvidia 
drivers? 
https://github.com/Andy1978/octave-debugging/blob/master/hgload_print/render_ofig.cpp

The Makefile create an .ofig with
"figure visible off; sombrero; hgsave sombrero.ofig;"

and render_ofig calls hgload ("sombrero.ofig") print ("sombrero.pdf") 
which uses __osmesa_print__ and gl2ps.

it's also linked against libGL.so:
$ ldd render_ofig | grep libGL
 libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f5cc908a000)
 libGLU.so.1 => /usr/lib/x86_64-linux-gnu/libGLU.so.1 (0x00007f5cc8e1c000

$ readlink -e /usr/lib/x86_64-linux-gnu/libGL.so.1
/usr/lib/x86_64-linux-gnu/nvidia/legacy-304xx/libGL.so.304.131

why doesn't this segfault?

-- Andy