[gdal-dev] compiling MrSID plugin

[Moritz Lennert]

On 20/02/15 18:08, Even Rouault wrote:
> Le vendredi 20 février 2015 12:16:55, Moritz Lennert a écrit :
>> On 19/02/15 19:57, Even Rouault wrote:
>>> Le jeudi 19 février 2015 18:43:06, Moritz Lennert a écrit :
>>>> Hi,
>>>>
>>>> I do'nt know if this is more an issue for DebianGIS, but I have the
>>>> feeling it is an upstream issue, so I'm posting it here. Please redirect
>>>> me if you think I'm wrong.
>>>>
>>>> I'm trying to activate MrSID support for GDAL.
>>>>
>>>> I downloaded and unpacked MrSID_DSDK-9.1.0.4045-linux.x86-64.gcc44.
>>>>
>>>> Then I ran the following on a Debian testing machine:
>>>>
>>>> **
>>>> apt-get source gdal
>>>> cd gdal-1.10.1+dfsg/
>>>> debian/rules gdal-mrsid (which AFAIU basically just creates
>>>> libgdal-mrsid-1.10.1.tar.gz and copies it to the directory above the
>>>> GDAL source directory)
>>>> cd ../
>>>> tar xvzf libgdal-mrsid-1.10.1.tar.gz
>>>> cd libgdal-mrsid-1.10.1/
>>>> chmod +x configure
>>>> ./configure --with-gdal=/usr/bin/gdal-config
>>>> --with-mrsid=/home/mlennert/SRC/MrSID_DSDK-9.1.0.4045-linux.x86-64.gcc44
>>>> /Ra ster_DSDK --with-jp2mrsid=no
>>>> make
>>>> sudo make install
>>>> **
>>>>
>>>> I do not get any error message, but when I run
>>>>
>>>> gdalinfo --formats | grep -i sid
>>>>
>>>> the MrSID format is not listed.
>>>>
>>>> I ran ldd on the plugin .so installed in /usr/lib/gdalplugin
>>>>
>>>> and saw that it couldn't find libltidsdk.so.
>>>>
>>>> So I set
>>>>
>>>> export
>>>> LD_LIBRARY_PATH=/home/mlennert/SRC/MrSID_DSDK-9.1.0.4045-linux.x86-64.gc
>>>> c44 /Raster_DSDK/lib/
>>>>
>>>> and now ldd could find the library, but MrSID is still not listed
>>>> amongst the available formats.
>>>
>>> Moritz,
>>>
>>> If once you've set LD_LIBRARY_PATH, ldd doesn't report any unfound
>>> library, then you could check if GDAL_DRIVER_PATH is defined and make
>>> point it to /usr/lib/gdalplugin (although that path should be hardcoded
>>> in the GDAL library by default)
>>
>> Setting GDAL_DRIVER_PATH did the trick. Thanks for the hint !
>>
>> Before adding this info to the wiki as Jeff suggested, I think we should
>> investigate why this path is not set by default as you say.
>>
>> In gcore/gdaldrivermanager.cpp I read:
>>
>> "There are a few rules for the driver path.  If the GDAL_DRIVER_PATH
>> environment variable it set, it is taken to be a list of directories to
>> search separated by colons on UNIX, or semi-colons on Windows.
>> Otherwise the /usr/local/lib/gdalplugins directory, and (if known) the
>> lib/gdalplugins subdirectory of the gdal home directory are searched on
>> UNIX and $(BINDIR)\gdalplugins on Windows."
>>
>> So, /usr/lib/gdalplugins (which is where the plugin gets installed by
>> default using the process I explained) does not seem to be in the list
>> of hardcoded paths. So, maybe '/usr/lib/gdalplugins' could be added to
>> the search path ? It does seem a fairly standard path...
>
> There's this snippet of code as well:
>
> #ifdef GDAL_PREFIX
>          papszSearchPath = CSLAddString( papszSearchPath,
>      #ifdef MACOSX_FRAMEWORK
>                                          GDAL_PREFIX "/PlugIns");
>      #else
>                                          GDAL_PREFIX "/lib/gdalplugins" );
>      #endif
>
> If you look at port/cpl_config.h, you'll see a  #define GDAL_PREFIX with the
> installation prefix, so for example /usr if you ran ./configure --prefix=/usr,
> which makes /usr/lib/gdalplugins to be searched.
>

Sorry for the delay in replying:

port/cpl_config.h shows this:

/* --prefix directory for GDAL install */
#define GDAL_PREFIX "/usr"

so does, obviously 'gdal-config --prefix'.

So it's a bit mysterious to me why I have to set GDAL_DRIVER_PATH...

Moritz