problem to link librt for clock_gettime

[geoHeil]

I am trying to create a conda package for h3 python bindings. My merge request is open here conda-forge/staged-recipes#8467

And I can't properly build it as there is an issue with: linking to librt for clock_gettime.

Can you set the missing flags upstream?

[isuruf]

More details: clock_gettime is in glibc>=2.17 and in librt for glibc<2.17.

[isaacbrodsky]

I think clock_gettime is only needed for the testing and benchmarking code, you might be able to build just the h3 target (the library code). This might be something like make -j${CPU_COUNT} VERBOSE=1 h3 in your pull request.

[isuruf]

you might be able to build just the h3 target (the library code)

It's only the benchmarks that need it, but to run make install all the targets have to be built. Is there a cmake option to avoid building benchmarks, so that make install can be done without it and we can also run tests?

[geoHeil]

@isuruf https://github.com/uber/h3/blob/master/CMakeLists.txt could be patched in the conda build to not include the benchmarks. According to https://stackoverflow.com/questions/17164731/installing-only-one-target-and-its-dependencies-out-of-a-complex-project-with there are a couple of options. Which one would you suggest to move forward?

[isaacbrodsky]

you might be able to build just the h3 target (the library code)

It's only the benchmarks that need it, but to run make install all the targets have to be built. Is there a cmake option to avoid building benchmarks, so that make install can be done without it and we can also run tests?

Yes, the benchmarks are considered part of the testing suite, so if you configure CMake with -D BUILD_TESTING=FALSE they should be excluded.

[geoHeil]

We currently opted to explicitly state the targets which need to be built. Having no testing also doesn't sound favorably https://github.com/conda-forge/staged-recipes/pull/8467/files#diff-836a1e5a12f9f2663a7069a305b3eb46R13

[geoHeil]

builds are green now conda-forge/staged-recipes#8467