[gdal-dev] Build question: GDAL with libwebp....

[Carl Godkin]

Hi Andrew,

Thanks for replying.  I am not looking for ways to edit CMakeLists.txt
files, especially since I don't really understand the syntax.

 I was just hoping that someone who had built GDAL with WEBP enabled would
tell me how to specify both libraries to cmake on the command line.

Sorry I over-complicated my question!

carl

On Tue, Feb 13, 2024 at 10:45 AM Andrew C Aitchison <andrew at aitchison.me.uk>
wrote:

> On Tue, 13 Feb 2024, Carl Godkin via gdal-dev wrote:
>
> > Hi,
> >
> > Sorry if this is an elementary cmake question but I am curious if there
> is
> > a cleaner solution than I came up with.
> >
> > I'm trying to build GDAL 3.8.3 with WEBP support.
> >
> > I built libwebp 1.3.2 (the latest) without any problems, also using
> cmake.
> >
> > However, when building GDAL, the link on the shared library fails since
> > WEBP seems to require TWO libraries (in the libwebp package), libwebp and
> > libsharpyuv.
> >
> > My question is how can I persuade cmake to accept both libraries for
> > WEBP_LIBRARY?
> >
> > I thought quotes would help.  What I think I ought to be able to do is
> > something like
> >
> >   -DWEBP_LIBRARY="/usr/local/devlibs/libwebp-1.3.2/lib64/libwebp.a
> > /usr/local/devlibs/libwebp-1.3.2/lib64/libsharpyuv.a" \
> >
> > or else
> >
> >   "-DWEBP_LIBRARY=/usr/local/devlibs/libwebp-1.3.2/lib64/libwebp.a
> > /usr/local/devlibs/libwebp-1.3.2/lib64/libsharpyuv.a" \
> >
> > but both options produce link lines that include the double quotes!  This
> > is an issue on Windows and Linux for me.
>
> CMAKE is rather more verbose than that.
>
> Compare
>     gdal/frmts/webp/CMakeLists.txt
> with
>     gdal/frmts/png/CMakeLists.txt
> for how the png driver uses libpng and zlib
>
> You probably don't need the gdal_add_vendored_lib commands or the
> GDAL_USE_..._INTERNAL tests, since gdal is not bundling libwebp.
>
> > I have a couple of workarounds that I won't bore you with, but I was
> > wondering what the best practice is here (other than hand-editing the
> cmake
> > output of course).
> >
> > I think that libwebp added the "sharpyuv" stuff at version 1.3.0 so
> perhaps
> > using an older version would also work, but that doesn't seem
> sustainable.
> >
> > Thanks for suggestions,
> >
> > carl
> >
>
> --
> Andrew C. Aitchison                      Kendal, UK
>                     andrew at aitchison.me.uk
>
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