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

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

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:
| >
| > [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
| > plLoadDriver: Trying to load at
| > /usr/local/lib/plplot5.1.0/data/../drivers/gdd_drv.so
| > Unable to load driver: gdd_drv.so.
| > Reason: /usr/local/lib/plplot5.1.0/data/../drivers/gdd_drv.so:
| > cannot open shared object file: No such file or directory
|
| This misleading error message from the wrong (second) dlerror has
| been annoying me for a while so I just fixed it in CVS.  Could you
| please try this again after cvs update?  That should give you both
| the first and second dlerror error messages with the -debug option
| (and no dlerror error messages if you don't specify -debug).
|
| Once the first dlerror message is output, I suspect you will get an
| error message about no access to a symbol in one of our libraries.=20
| If so, could you try to fix it by setting LD_LIBRARY_PATH to point to
| the directory (./ in this case) where our libraries have been built?
|
| > If I change in plcore.c, line 1855, RTLD_NOW to RTLD_LAZY, it
| > works:
| >
| > [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
| >
| > Oops... at home it worked (exactly same environement).
| > Nevertheless, now the driver is opened and the output file created
| > and partly filled, so there is some problem here.
|
| I don't need the RTLD_LAZY (or LD_LIBRARY_PATH under Debian), but I
| do confirm the second error you have just found.  Something is now
| wrong with the gd device driver if you don't specify -drvopt text.  I
| will look into it further.
|
| From the Linux dlopen man page at
| http://nodevice.com/sections/ManIndex/man0254.html, I don't see how
| RTLD_LAZY will fix the problem.  It will, however, delay the problem
| until you actually try to use the symbols, and you may have
| encountered the second error (see above) before that happened.  Once
| you re-run with the proper dlerror message and RTLD_NOW, we will know
| more.
|
| Alan

[jcard@feup] make x01c && LD_LIBRARY_PATH=3D. ./x01c -dev png -o po.png=20
-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:
=2E/drivers/gdd_drv.so: undefined symbol: gdImagePalettePixel
plLoadDriver: Trying to load at=20
/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=20
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.

Joao

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