Re: [Plplot-devel] png driver no longer works for python

[<jca...@in...>]

On Saturday 24 November 2001 18:39, Alan W. Irwin wrote:
| I just fixed the configuration issue so python should be a little
| easier to work with.
|
| I just tried the case with static drivers and pythondemos.py -dev
| png works. Thus, the only combination I know of that doesn't work
| is dynamic drivers + pythondemos.py -dev png.  I hope Joao is able
| to confirm this now for python=3D1.5.2 using double.

Yes:

jcard@rick:~/tmp/plplot/tmp > ./pythondemos.py -dev png -o po.png
Device not loaded!
tag=3Dpng, drvidx=3D4
Trying to load gd.drv on ./drivers/gd.drv
Trying to load at /usr/local/test/lib/drivers/gd.drv
Unable to load driver: gd.drv.
Reason: /usr/local/test/lib/drivers/gd.drv: cannot open shared object=20
file: No such file or directory <------------------------------------
Segmentation fault

The driver is not found at all. Setting PYTHONDIR=3D`pwd`

(by the way, where are all those variables (java also variables)=20
documented?)

jcard@rick:~/tmp/plplot/tmp > export=20
PYTHONDIR=3D/usr/local/test/python/=20
jcard@rick:~/tmp/plplot/tmp > ./pythondemos.py -dev jpeg -o po.jpeg
Device not loaded!
tag=3Djpeg, drvidx=3D4
Trying to load gd.drv on ./drivers/gd.drv
Trying to load at /usr/local/test/lib/drivers/gd.drv
Unable to load driver: gd.drv.
Reason: /usr/local/test/lib/drivers/gd.drv: undefined symbol: <-----
plP_setpxl
Segmentation fault

So, now the driver is loaded, but plP_setpxl is not found.
But the symbol is defined in libplplot.so:

jcard@rick:~/tmp/plplot/tmp > nm -p libplplotd.so | fgrep plP_setpxl
00019910 T plP_setpxl

| Presuming that will be confirmed, I think the key question is how
| is the dynamic ps driver treated differently than the dynamic gd
| driver?

As far as I know, all dynamic drivers are treated the same way, as=20
the procedure to load them is the same.
Thus, the problem is with python dynamic loading, not the gd driver=20
(that works for other bindings/programs). It must be one of those=20
environment variables that we like so much... I make no idea.

The problem is with python needing to load both libplplotd.so and=20
drivers/gd.drv. It founds the last, but not the first.

If I change RTLD_NOW to RTLD_LAZY in plcore.c, the behaviour changes,=20
but the demo still does not run.

No more ideias.

Joao

|
| Alan
|
| email: ir...@be...
| phone: 250-727-2902=09FAX: 250-721-7715
| snail-mail:
| Dr. Alan W. Irwin
| Department of Physics and Astronomy,
| University of Victoria, P.O. Box 3055,
| Victoria, British Columbia, Canada, V8W 3P6
| __________________________
|
| Linux-powered astrophysics
| __________________________