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Build ElmerIce with netCDF in CI on Ubuntu #589

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@mmuetzel mmuetzel commented Oct 2, 2024

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ElmerIce requires MPI. So, install netCDF only for the jobs that build
with MPI.
Newer versions of netCDF install a CMake config file.
But the CMake config file of netCDF for Fortran cannot be used currently.
Make sure to use the CMake find module bundled with Elmer to detect
netCDF and netCDF for Fortran.
The netCDF Fortran library depends on the netCDF library. For some
linkers (e.g., ld.bfd), the linking order matters.
Make sure to have the netCDF Fortran library *before* the netCDF library
in the linker flags.
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mmuetzel commented Oct 7, 2024

The issue with the CMake config file that is installed by netCDF for Fortran is already fixed upstream:
Unidata/netcdf-fortran#428

Until that change is included in a released version and that version finds its way into the packages that are distributed, it is probably be best to keep using the FindNETCDF.cmake module that is part of the ElmerFEM sources.

When these newer versions of netCDF for Fortran are starting to appear, it should be easy to adapt the FindNETCDF.cmake module to pick the fixed config file up if available.

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