[gdal-dev] CMake: undefined reference to symbol dlerror

[Javier Jimenez Shaw]

Hi Even

If I understood the example you mention correctly, it is a direct
dependency of GDAL: the executable test_cpp links directly with GDAL.
Our problem is that we have a library (ioimage), that links with GDAL. The
error appears when we try to compile/link tests_unit_ioimage, that depends
on ioimage, that depends on GDAL.

Cheers,
Javier
.___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
Entre dos pensamientos racionales
hay infinitos pensamientos irracionales.



On Mon, 2 May 2022 at 10:29, Even Rouault <even.rouault at spatialys.com>
wrote:

>
> Le 29/04/2022 à 11:30, Javier Jimenez Shaw a écrit :
>
> We have a link problem on Linux when using GDAL transiently. If we link
> the unit tests for a library which depends on GDAL, i.e. an executable
> which transiently depends on GDAL through our library, we get the following
> linker error:
>
> /usr/bin/ld:
> libs/ioimage/tests/CMakeFiles/tests_unit_ioimage.dir/unit/writers/test_geoTiffWriter.cpp.o:
> undefined reference to symbol 'dlerror@@GLIBC_2.2.5'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libdl.so.2: error adding symbols: DSO
> missing from command line
>
> We need to add -ldl to the linker line after GDAL in order to resolve the
> linker problem. This can be done when adding the property
>
>   INTERFACE_LINK_LIBRARIES "dl"
>
> to the GDAL::GDAL imported target in GDAL-targets-release.cmake (this is
> a generated file); apparently it is not enough to add dl to the
> IMPORTED_LINK_DEPENDENT_LIBRARIES_RELEASE property.
>
> Does GDAL depend publicly on dl?
>
> Not that I'm aware of.
>
> Our CI runs ./autotest/postinstall/test_cmake.sh which in particular has a
> ./autotest/postinstall/test_cpp/CMakeLists.txt that has GDAL has a
> dependency
>
> Perhaps you could check how your setup is different from that ?
>
> We do not find the proper way to patch GDAL's CMake code to add that
> dependency in the generated config file.
>
> Thanks
> Javier
>
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales
> hay infinitos pensamientos irracionales.
>
>
> _______________________________________________
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