filter tests should not run when HDF5 doesn't support them.

[WardF]

Currently, netCDF tries to run the filter tests even if the underlying libhdf5 doesn't support them. This feature should only be available if linking against hdf5 when dynamic filter support is available.

[WardF]

This can currently be worked around by passing --disable-filter-testing at configure time or -DENABLE_FILTER_TESTING=OFF when using cmake.

[edwardhartnett]

When can HDF5 not support filters?

When it's a --disable-shared build, I believe. But under no other circumstances that I am aware of...

[DennisHeimbigner]

However, even if shared is disabled, it should still be
possible to do deflate and szip compression since those
would be built into HDF5.

[edwardhartnett]

@DennisHeimbigner that is correct (also fletcher32 and shuffle filters are also built in).

There does not seem to be any way to turn off filter support in HDF5, except to build static.

[edwardhartnett]

Can this issue be closed? I have not seen any such failures recently...