[gdal-dev] Add capability to safely link against an external libtiff (3.X) and a GDAL build with internal libtiff (4.0) support

[Julien Malik]

Hello,

Great news !
I don't have a lot of time right now, but setting up a test platform 
with gdal trunk is high in my priority list !

About the testing, we identified two problematic cases :

[1] http://hg.orfeo-toolbox.org/OTB/file/tip/CMake/TestXTIFFOpen.cxx
Linked with '-lgdal -lgeotiff -ltiff'.
On an ubuntu machine, this program crashes when accessing a TIFF

[2] http://hg.orfeo-toolbox.org/OTB/file/tip/CMake/TestGDALOpen.cxx
Linked with '-lgeotiff -lgdal'
On a debian machine, this program crashes when opening a TIFF.
Not sure but I think things evolved in unstable and we have a similar 
behavior as Ubuntu (would need further checking, as we don't have a 
regular debian unstable nightly build...)

You might want to check those two as part of the gdal test system.
In OTB, we do this as part of the configuration phase, and print a 
warning in case something fails.


Regards,
Julien



Le 03/07/2011 19:02, Even Rouault a écrit :
>
>> Do you have some particular indication about how to test it?
>> Which test programs did you use?
> My tests mainly consisted in checking that GDAL would compile and link
> successfully with various combinations of the configure options.
>
> With the renaming options enabled, I did a "objdump -t libgdal.so | awk
> '{print $6}' | grep TIFF | grep -v TIFFjpeg_ | grep -v aig_ | grep -v gdal_ |
> sort -u" to ensure that all the symbols that should be renamed are. You will
> notice a few remaining occurrences but I think they are safe.
>
> Also, when the renaming options where enabled, I added -ltiff -lgeotiff to the
> gdalinfo linking line, before or after -lgdal, and tested the executable on a
> few files.
>
>>
>> It seems to me that people of the the OTB project had serious problems
>> with this issue in the past and they have a fantastic test framework.
>>
>> Maybe we could also ask to them for a little help for testing.
> Yes indeed, I had CC'ed Julien Malik who is affiliated with the OTB project in
> my announcement email.
>
>>
>> ciao
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