Re: [netcdfgroup] netCDF-C 4.4.1 now available

• To: Ward Fisher <wfisher@xxxxxxxx>
• Subject: Re: [netcdfgroup] netCDF-C 4.4.1 now available
• From: Mary Haley <haley@xxxxxxxx>
• Date: Wed, 29 Jun 2016 11:16:14 -0600

Hi Ward,

Congrats on the new release!

This reminds me of a question that we have about the "conda" versions of
the NetCDF library that are served by Anaconda.

The official version of libnetcdf on Anaconda is 4.3.3.1 according to this
page:

https://docs.continuum.io/anaconda/pkg-docs

However, if you look at this page:

https://anaconda.org/anaconda/libnetcdf/files

it shows that the MacOS version of libnetcdf is actually at 4.4.0, and the
Linux/Windows version are at 4.3.3.1.

Long story short: this causes us some grief when trying to build conda
packages against the default libnetcdf version, because they will have
different functionality for MacOS versus Linux/Windows. (CDF5 support is
one of them).

Do you know anything about this, or do you have any influence to get them
to upgrade to 4.4.0[1] for all systems?

Thanks,

--Mary

On Tue, Jun 28, 2016 at 3:46 PM, Ward Fisher <wfisher@xxxxxxxx> wrote:

> Hello all,
>
> The final release for netCDF-C 4.4.1 is now available. This release
> provides official support for libhdf5 1.10.0; previous versions of netCDF
> will generate binary files which cannot be read on systems using older
> versions of libhdf5. A summary of changes between this official release and
> the previous release candidate are as follows:
>
>    - [File Change] Starting with release 4.4.1, netCDF-4 files created
>    will have superblock version 0 instead of superblock version 2, as was
>    observed in previous netCDF versions. This is due to a workaround required
>    to avoid backwards binary incompatibility when using libhdf5 1.10.x or
>    greater. Superblock versions 0 and 2 appear to be forward and backward
>    compatible. Other than a different superblock number the data should remain
>    consistent.
>    - [Enhancement] Added better error reporting when ncdump/nccopy are
>    given a bad constraint in a DAP url. See GitHub #279
>    <https://github.com/Unidata/netcdf-c/pull/279> for more information.
>
> Full release notes are available here
> <https://github.com/Unidata/netcdf-c/blob/v4.4.1/RELEASE_NOTES.md>.
>
> The following resources are available:
>
>    - Documentation: http://www.unidata.ucar.edu/software/netcdf/docs
>    - Tarball and zipfile downloads:
>       - Unidata hosted: http://www.unidata.ucar.edu/downloads/netcdf
>       - GitHub hosted: https://github.com/Unidata/netcdf-c/releases/v4.4.1
>    - Windows installer downloads:
>    http://www.unidata.ucar.edu/software/netcdf/docs/winbin.html
>
> Thank you all for your patience and for all the feedback we have received!
> If there are any issues or questions with this release, please don’t
> hesitate to let us know. Have a great day all!
>
> -Ward
>
> Ward Fisher
> wfisher@xxxxxxxx
> UCAR/Unidata - Software Engineer
> ​
>
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• References:
  • [netcdfgroup] netCDF-C 4.4.1 now available
    • From: Ward Fisher