Compilation Failure on M1 MacOS due to Missing -lrt and -lsz

[davidace]

Compilation Failure on M1 MacOS due to Missing -lrt and -lsz

[DavidAce]

As far as I can tell, these two libraries are included by the underlying HDF5 library. -lsz is for the szip library and -lrt is the real-time extensions library. For the szip library, you can check if it is installed in your system (e.g. with brew). Presumably the find_package config file bundled with your HDF5 install is including these two libraries. Are you able to link HDF5 to a program without h5pp? How have you installed the dependencies, by the way?

Since h5pp is a header-only library, compilation only happens when building the tests, as you have noticed. However, I have included opt-in flags to let h5pp build its dependencies on the fly during the configuration stage, using a "CMake-only" approach or using the conan package manager.

The easiest way to let h5pp install dependencies automatically is by using the presets provided. To list the presets run cmake --list-presets in the root directory. You can inherit and build upon any of those presets with CMakeUserPresets.json. See also the following github action running on macos12 where these approaches work: https://github.com/DavidAce/h5pp/actions/runs/6059557138/workflow

If none of this is working, try posting the output from your CMake configure, after adding for instance --log-level=verbose or passing -DCMAKE_MESSAGE_LOG_LEVEL=VERBOSE. This should print what each CMake target is linking to.

[DavidAce]

I'm closing this for now, but feel free to create a new issue if the problem persists in the newest release of h5pp.