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Bad NetCDF4 compatibility check #2026
Description
When using the conda package for this library, I ran into an unusual issue of PIO rejecting NetCDF4 while claiming it was supported.
has_netcdf4p = PIO_iotype_available(pio_iotype_netcdf4p) ! Evaluates to .TRUE.
piostat = pio_createfile(piosystem, piofile, &
pio_iotype_netcdf, 'untitled.nc', pio_clobber) ! Works
piostat = pio_createfile(piosystem, piofile, &
pio_iotype_netcdf4p, 'untitled.nc', pio_clobber) ! Aborts with vague PIO_EINVALI pinpointed the issue here, at function iotype_is_valid, lines 3130-3133. Because NetCDF has progressed to version 4.10.0, the patch number alone is no longer a reliable marker.
/* Some builds include netCDF-4. */
/* as of netcdf 4.9.3 NC_HAS_NC4 is no longer defined */
#if NC_HAS_NC4 || (NC_VERSION_PATCH > 2)
if (iotype == PIO_IOTYPE_NETCDF4C || iotype == PIO_IOTYPE_NETCDF4P)
ret++;
#endif /* _NETCDF4 */A quick fix is just to use older versions of NetCDF.
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