Make parallel-netcdf an optional dependency, only compiled if MPAS is used #1613
Description
Is your feature request related to a problem? Please describe.
parallel-netcdf isn't needed unless the MPAS model is used. The interfaces to parallel-netcdf are already turned off in esmf and netcdf-c. But the default setting for parallelio is to enable the interface.
This package is causing increasing headaches, especially with the latest update to spack develop (#1607) on Cray systems. Also, it is one of the few packages that simply don't build if your shell isn't bash but ksh (yes, that case still exists).
1 error found in build log:
19 checking for gawk... (cached) gawk
20 checking for grep that handles long lines and -e... /usr/bin/grep
21 checking for egrep... /usr/bin/grep -E
22 checking for a sed that does not truncate output... /usr/bin/sed
23 checking for sed handling option -i ... /usr/bin/sed -i''
24 checking cc under /opt/cray/pe/mpich/8.1.26/ofi/intel/2022.1/bin... no
>> 25 configure: error:
26 -----------------------------------------------------------------------
27 Specified MPI C compiler "cc" cannot be found under /opt/cray/pe/mpich/8.1.26/ofi/intel/2022.1
28 PnetCDF requires a working MPI C compiler. Please specify the location
29 of an MPI C compiler, either in the MPICC environment variable
30 (not CC variable) or through --with-mpi configure flag. Abort.
31 -----------------------------------------------------------------------
See build log for details:
/p/work2/heinzell/spst-upd-spdev-20250415/cache/build_stage/spack-stage-parallel-netcdf-1.12.3-3issk2b4kp462j7u636t6vf774kppd5s/spack-build-out.txt
Describe the solution you'd like
- Fix
parallel-netcdfso that it still builds on Cray (because it is used by MPAS and mpas-jedi-env). - In parallel, prefer
parallelio ~pnetcdfand enable the variant explicitly inmpas-jedi-envand others. I believeufs-weather-model-envalso wants this as the UFS is moving to MPAS in parts and won't have all the I/O capabilities in the native UFS IO layer (they may still be using the MPASparallelio/parallel-netcdfI/O features for now)
Additional context
n/a
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