Re: [Plplot-devel] gd driver and dlopen() flags

[<jc...@fe...>]

On Monday 16 September 2002 19:21, Jo=E3o Cardoso wrote:
| On Monday 16 September 2002 18:45, Alan W. Irwin wrote:
| | On Mon, 16 Sep 2002, [iso-8859-1] Jo=E3o Cardoso wrote:
| | > Hi,
| | >
| | > In the current cvs I can't use the png driver:
=2E..

| [jcard@feup] make x01c && LD_LIBRARY_PATH=3D. ./x01c -dev png -o po.png
| -debug
| make: `x01c' is up to date.
| Plplot library version: 5.1.0
| plLoadDriver: Device not loaded!
| plLoadDriver: tag=3Dpng, drvidx=3D4
| plLoadDriver: Trying to load gdd_drv.so on ./drivers/gdd_drv.so
| plLoadDriver: Local dlopen failed because of the following reason:
| ./drivers/gdd_drv.so: undefined symbol: gdImagePalettePixel
| plLoadDriver: Trying to load at
| /usr/local/lib/plplot5.1.0/data/../drivers/gdd_drv.so
| plLoadDriver: Global dlopen failed because of the following reason:
| /usr/local/lib/plplot5.1.0/data/../drivers/gdd_drv.so: cannot open
| shared object file: No such file or directory
| Unable to load driver: gdd_drv.so.
| Segmentation fault
|
| [jcard@feup] rpm -q gd
| gd-1.8.4-238
|
| And gdImagePalettePixel() does not exists in the gd library.

I found that gdImagePalettePixel() is really a macro:

#define gdImagePalettePixel(  im, x, y )   (im)->pixels[(y)][(x)]

So, putting it above  gd.c:plD_gd_optimise(), makes the unknown symbol=20
error to disappear, but the seg fault still happens:

[jcard@feup] ./x01c -dev png -o po.png
Plplot library version: 5.1.0
Opened po.png
Segmentation fault
[jcard@feup] ./x01c -dev png -o po.png -debug
Plplot library version: 5.1.0
plLoadDriver: Device not loaded!
plLoadDriver: tag=3Dpng, drvidx=3D4
plLoadDriver: Trying to load gdd_drv.so on ./drivers/gdd_drv.so
Opened po.png
Segmentation fault

[jcard@feup] ls -l po.png
-rw-r--r--    1 jcard    users        8192 Sep 16 20:01 po.png

Notice that the file is written to some extent.

Joao