netCDF-C 4.4.0-rc3

This is the third release candidate for netCDF-C 4.4.0. This release is primarily a bugfix release, addressing several smaller bugs reported from the first and second release candidates.

See the release notes for full details.

NetCDF-C 4.4.0-rc2

This is the second release candidate for netCDF-C 4.4.0. This release is a bugfix release, addressing several smaller bugs reported from the first release candidate.

See the release notes for full details.

NetCDF-C 4.4.0-rc1

This is the first release candidate for netCDF-C 4.4.0. Highlights of this release include:

• The ability to open netCDF data "in memory" using nc_open_mem().
• Added an authorization reference document as oc2/ocauth.html.

in addition to numerous bug fixes and optimizations. See the release notes for full details.

NetCDF-C 4.3.3.1

This is a bug-fix release based on the netCDF-C 4.3.3 release. The release notes for this release are below. Full release notes may be found at https://github.com/Unidata/netcdf-c/blob/v4.3.3.1/RELEASE_NOTES.md.

netCDF-C 4.3.3.1

• Fixed a bug related to renaming the attributes of coordinate variables in a subgroup. See NCF-325 for more information.

NetCDF-C 4.3.3

The notes below only reflect changes from the last release candidate. Full release notes may be found at https://github.com/Unidata/netcdf-c/blob/v4.3.3/RELEASE_NOTES.md.

4.3.3 Released 2015-02-12

• Fixed bug resulting in error closing a valid netCDF-4 file with a dimension and a non-coordinate variable with the same name. NCF-324
• Enabled previously-disabled shell-script-based tests for Visual Studio when bash is detected.

NetCDF-C 4.3.3-rc3

4.3.3-rc3 Released 2015-01-14

• Added functionality to make it easier to build netcdf-fortran as part of the netcdf-c build for NON-MSVC builds. This functionality is enabled at configure time by using the following Highly Experimental options:
  • CMake: -DENABLE_REMOTE_FORTRAN_BOOTSTRAP=ON
  • Autotools: --enable-remote-fortran-bootstrap

Details are as follows:

---

Enabling these options creates two new make targets:

• build-netcdf-fortran
• install-netcdf-fortran

Example Work Flow from netcdf-c source directory:

• $ ./configure --enable-remote-fortran-bootstrap --prefix=$HOME/local
• $ make check
• $ make install
• $ make build-netcdf-fortran
• $ make install-netcdf-fortran

These make targets are only valid after make install has been invoked. This cannot be enforced rigidly in the makefile for reasons we will expand on in the documentation, but in short: make install may require sudo, but using sudo will discard environmental variables required when attempting to build netcdf-fortran in this manner.

It is important to note that this is functionality is for convenience only. It will remain possible to build netcdf-c and netcdf-fortran manually. These make targets should hopefully suffice for the majority of our users, but for corner cases it may still be required of the user to perform a manual build. NCF-323

---

• Added a failure state if the m4 utility is not found on non-Windows systems; previously, the build would fail when it reached the point of invoking m4.

• Added an explicit check in the build systems (autotools, cmake) for the CURL-related option CURLOPT_CHUNK_BGN_FUNCTION. This option was introduced in libcurl version 7.21.0. On installations which require libcurl and have this version, CURLOPT_CHUNK_BGN_FUNCTION will be available. Otherwise, it will not.

• The pnetcdf support was not properly being used to provide mpi parallel io for netcdf-3 classic files. The wrong dispatch table was being used. NCF-319

• Fixed bug in ncgen. When classic format was in force (k=1 or k=4), the "long" datatype should be treated as int32. Was returning an error. NCF-318

• Fixed bug where if the netCDF-C library is built with the HDF5 library but without the HDF4 library and one attempts to open an HDF4 file, an abort occurs rather than returning a proper error code (NC_ENOTNC). NCF-317

• Added a new option, NC_EXTRA_DEPS, for cmake-based builds. This is analogous to LIBS in autotools-based builds. Example usage:

  $ cmake .. -NC_EXTRA_DEPS="-lcustom_lib"

More details may be found at the Unidata JIRA Dashboard. NCF-316

NetCDF-C 4.3.3-rc2

4.3.3-rc2 Released 2014-09-24

• Fixed the code for handling character constants
  in datalists in ncgen. Two of the problems were:

  1. It failed on large constants
  2. It did not handle e.g. var = 'a', 'b', ...
     in the same way that ncgen3 did.
     See NCF-309.

• Added a new file, netcdf_meta.h. This file is generated automatically at configure time and contains information related to the capabilities of the netcdf library. This file may be used by projects dependent upon netcdf to make decisions during configuration, based on how the netcdf library was built. The macro NC_HAVE_META_H is defined in netcdf.h. Paired with judicious use of #ifdef's, this macro will indicate to developers whether or not the meta-header file is present. See NCF-313.

  Determining the presence of netcdf_meta.h can also be accomplished by methods common to autotools and cmake-based build systems.

• Changed Doxygen-generated documentation hosted by Unidata to use more robust server-based searching.

• Corrected embedded URLs in release notes.

• Corrected an issue where building with HDF4 support with Visual Studio would fail.

NetCDF-C 4.3.3-rc1

4.3.3-rc1 Released 2014-08-25

• Added CMake-based export files, contributed by Nico Schlömer. See #74.
• Fixed ncdump bug for char variables with multiple unlimited dimensions and added an associated test. Now the output CDL properly disambiguates dimension groupings, so that ncgen can generate the original file from the CDL. NCF-310
• Converted the Manually-maintained FAQ page into markdown and added it to the docs/ directory. This way the html version will be generated when the rest of the documentation is built, the FAQ will be under version control, and it will be in a more visible location, hopefully making it easier to maintain.
• Bumped minimum required version of cmake to 2.8.12. This was necessitated by the adoption of the new CMAKE_MACOSX_RPATH property, for use on OSX.
• Jennifer Adams has requested a reversion in behavior so that all dap requests include a constraint. Problem is caused by change in prefetch where if all variables are requested, then no constraint is generated. Fix is to always generate a constraint in prefetch.
  NCF-308
• Added a new option for cmake-based builds, ENABLE_DOXYGEN_LATEX_OUTPUT. On those systems with make and pdflatex, setting this option ON will result in pdf versions of the documentation being built. This feature is experimental.
• Bumped minimum CMake version to 2.8.9 from 2.8.8 as part of a larger pull request contributed by Nico Schlömer. Pull Request #64
• Replaced the NetCDF Library Architecture image with an updated version from the 2012 NetCDF Workshop slides.
• Fix HDF4 files to support chunking.
  NCF-272
• NetCDF creates a libnetcdf.settings file after configuration now, similar to those generated by HDF4 and HDF5. It is installed into the same directory as the libraries. NCF-303.
• Renamed man4/ directory to docs/ to make the purpose and contents clearer. See man4 vs. docs #60.
• Removed redundant variable BUILD_DOCS from the CMake configuration file. See the issue at github: #59.
• Added missing documentation templates to man4/Makefile.am, to correct an issue when trying to build the local Doxygen-generated documentation. This issue was reported by Nico Schlömer and may be viewed on github. Releases miss Doxygen files #56
• When the NC_MPIPOSIX flag is given for parallel I/O access and the HDF5 library does not have the MPI-POSIX VFD configured in, the NC_MPIPOSIX flag is transparently aliased to the NC_MPIIO flag within the netCDF-4 library.

NetCDF-C 4.3.2

Below are the release notes for the changes made since the v4.3.1.1 release.

4.3.2 Released 2014-04-23

• As part of an ongoing project, the Doxygen-generated netcdf documentation has been reorganized. The goal is to make the documentation easier to parse, and to eliminate redundant material. This project is ongoing.
• The oc .dodsrc reader was improperly handling the user name and password entries. NCF-299
• CTestConfig.cmake has been made into a template so that users may easily specify the location of an alternative CDash-based Dashboard using the following two options:
  • NC_TEST_DROP_SITE - Specify an alternative Dashboard by URL or IP address.
  • NC_CTEST_DROP_LOC_PREFIX - Specify a prefix on the remote webserver relative to the root directory. This lets CTest accommodate dashboards that do not live at the top level of the web server.
• Return an error code on open instead of an assertion violation for truncated file.

4.3.2-rc2 Released 2014-04-15

• Cleaned up a number of CMake inconsistencies related to CMake usage, parallel builds.
• Now passing -Wl,--no-undefined to linker when appropriate.
• Corrected an issue preventing large file tests from running correctly under Windows.
• Misc Bug Fixes detected by static analysis.

4.3.2-rc1 Released 2014-03-20

• Pre-built Windows downloads will now be bundled with the latest (as of the time of this writing) versions of the various dependencies:
  • hdf5: 1.8.12
  • zlib: 1.2.8
  • libcurl: 7.35.0
• Added a separate flag to enable DAP AUTH tests. These tests are disabled by default. The flags for autotools and CMAKE-based builds are (respectively):
  • --enable-dap-auth-tests
  • -DENABLE_DAP_AUTH_TESTS
• Fixed small default chunk size for 1-dimensional record variables. NCF-211
• Cleaned up type handling in netCDF-4 to fix bugs with fill-values.
• Corrected "BAIL" macros to avoid infinite loop when logging is disabled and an error occurs.
• Refactored how types are used for attributes, variables, and committed types, clarifying and categorizing fields in structs, and eliminating duplicated type information between variables and types they use.
• Made type structure sharable by committed datatypes and variables that use it.
• Handled string datatypes correctly, particularly for fill value attributes. Expanded testing for string fill values.
• Simplified iteration of objects in the file when it's opened, tracking fewer objects and using less memory.
• Enabled netCDF-4 bit-for-bit reproducibility for nccopy and other applications (thanks to Rimvydas Jasinskas and Quincey Koziol) by turning off HDF5 object creation, access, and modification time tracking. NCF-290
• Addressed an issue where cmake-based builds would not properly create a pkg-config file. This file is now created properly by cmake. NCF-288
• Addressed an issue related to old DAP servers. NCF-287

NetCDF-C 4.3.2-rc2

4.3.2-rc2 Released 2014-04-15

• Cleaned up a number of CMake inconsistencies related to CMake usage, parallel builds.
• Now passing -Wl,--no-undefined to linker.
• Corrected an issue preventing large file tests from running correctly under Windows.
• Misc Bug Fixes detected by static analysis.