[gdal-dev] Building GDAL on Ubuntu 22.04

[Kai Pastor, DG0YT]

The original post/current issue really points at a missing libstdc++ dev 
package.

For the past build issues, it is almost never exactly "missing 
libstdc++" but actually needing the C++ linker. Recognizing C++ linkage 
is a problem when you cannot rely on CMake config files for static 
library linkage. The library which needs C++ linkage can be behind a 
library with C interface, and subject to configuration.
Example: lerc behind tiff.

(In vpckg ports, I add the difference of 
CMAKE_CXX_IMPLICIT_LINK_LIBRARIES and CMAKE_C_IMPLICIT_LINK_LIBRARIES to 
the pkg-config file when I need to pass on C++ linkage. Resolving it at 
the root. But I know a lot of ugly hacks downstream...)

Am 06.07.24 um 12:39 schrieb Even Rouault:
> I definitely ran into build issues in that past related to missing 
> libstdc++ (perhaps related to using older CMake and/or clang?). But 
> looking closer, we only add -lstdc++ when building a test program 
> fails without this explicit addition. Cf 
> https://github.com/OSGeo/gdal/blob/master/cmake/helpers/GdalCompilationFlags.cmake#L165 
> to L183
>
> Le 06/07/2024 à 12:02, Kai Pastor, DG0YT via gdal-dev a écrit :
>> Why does it have to force anything at all? CMake normally knows how 
>> to setup CMAKE_CXX_IMPLICIT_LINK_LIBRARIES.
>>
>> (Right now fixing hard-coded libstdc++ assumptions in ffmpeg and 
>> dependencies in vcpkg, breaking Android.)
>>
>> Kai
>>
>> Am 06.07.24 um 09:59 schrieb Even Rouault via gdal-dev:
>>> Hi,
>>>
>>> when using CLang, GDAL forces the use of libstdc++ for linking, so 
>>> seeing "cannot find -lstdc++", I suspect you might lack the 
>>> installation of libstdc++-11-dev package
>>>
>>> Even
>>
>>
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>
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