[gdal-dev] PDF: configure option --enable-pdf-plugin

[Andreas Neumann]

Hi Even, 

Thanks for the clarification. In that case I don't need to build it as a
plugin, since this build will only end up on my own local machine. 

Andreas 

On 2019-11-20 11:08, Even Rouault wrote:

> Andreas,
> 
>> I wonder what exactly the build option "--enable-pdf-plugin enable PDF
>> driver as a plugin (included in libgdal by default)" means?
> 
> Plugin here means as a separate .so/.dll : gdal_PDF.so/dll
> Mostly for licensing concerns if using the Poppler backend since Poppler is 
> subject to the GPL. So you can make a libgdal build mostly subject to X/MIT or 
> similar licenses, and in case you need it, use a gdal_PDF plugin subject to 
> GPL
> 
>> How does this relate to the other options of building against
>> poppler/podofo/pdfium ?
> 
> It is orthogonal to the poppler/podofo/pdfium backend(s) used.
> For the pdfium backend, which is a bit involved to build (pdfium actually), 
> there were also issues with symbol clashes between embedded libraries in 
> pdfium and others used by GDAL, and making a plugin instead of linking in core 
> GDAL library seemed to "solve" (workaround) issues. Was at least true on Linux 
> with pdfium of a few years ago. I don't remember having had such issues with 
> the recent upgrade I did in GDAL master.
> 
> Even
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