NetCDF-Fortran  4.6.0
Release Notes

Release notes file for the netcdf-fortran package.

This file contains a high-level description of this package's evolution. Entries are in reverse chronological order (most recent first).

4.6.0 - July 29, 2022


  • netCDF-C: 4.9.0+

Notable Changes

  • We've added API support to take advantage of the Quantize functionality provided by libnetcdf 4.9.0+. See this conversation for more information.
  • We've added API support to take advantage of ZStandard compression functionality, as described here. Note that you can suppress this with the new options --disable-zstandard-plugin (for configure) and -DDISABLE_ZSTANDARD_PLUGIN (for cmake).

Other Changes

New Contributors

4.5.4 - January 7, 2022


  • netCDF-C: 4.7.4+


4.5.3 - June 2, 2020


  • netCDF-C: 4.7.4+


  • Adds a libnetcdff.settings file similar to libnetcdf.settings. See Github #256 for more information.
  • Added support for gcc/gfortran 10. The -fallow_argument_mismatch flag is passed to the underlying compiler when the flag is found to be supported. This change has been added to the autotools and cmake based builds. See GitHub #212 for more information.
  • Added support for HDF5 compact storage. See Github #213.
  • Added support for creating netCDF/HDF5 files with szip compression with new functions nf90_def_var_szip() and nf_def_var_szip(). See Github #213.
  • Corrected an issue where parallel netCDF-Fortran builds would fail despite the presense of MPI libraries/compiler/infrastructure. See Github #208 for more information.

4.5.2 - September 18, 2019


  • netCDF-C: 4.6.0 or greater


  • Corrected an issue where netCDF-Fortran would fail to build correctly on some platforms when the underlying libnetcdf lacked netCDF-4 support. See GitHub #200 for more information.
  • Corrected an issue where cmake-specific large file tests weren't being captured by make dist. See Github #198 for more details.

4.5.1 - September 4, 2019


  • netCDF-C: 4.6.0 or greater


  • Corrected an issue where a cmake-specific file wasn't being captured by make dist.
  • Corrected an issue where nf-config wasn't being generated by cmake-based builds. Corrected a couple of other missing files. See Github #108 for more information.

4.5.0 - August 28, 2019


  • netCDF-C: 4.6.0 or greater


  • Moved netCDF classic F90 API tests to new subdirectory nf03_test.
  • Moved netCDF-4 F77 API tests to new subdirectory nf_test4.
  • Moved netCDF-4 F90 API tests to new subdirectory nf03_test4.
  • Fixed bug which caused parallel I/O tests to not be run. See #155 and #157.
  • Fixed bug in the setting of file cache preemption for netCDF-4 files. See #146.
  • Removed many near-duplicate tests files, now they are created at build time with sed. See #165.
  • Removed no longer needed configure options –enable-dll (see #161), --enable-extra-tests (see #114), --enable-extra-example-tests (see #126), and --enable-valgrind (see #118).
  • Moved handling of F77 man page to the docs directory. See #141.

4.4.5 - Release Jan 9, 2019


  • netCDF-C: 4.6.0 or greater


  • Removed legacy cfortran.h based build, which allowed F77-only compilers to build the F77 API (only). Since all compilers now support F2003, we can use F2003 features to build the F77 API. Full backwards-compatibility with all existing F77 API code is assured. See #85 for more information.
  • Added an option in cmake builds, BUILD_EXAMPLES, TRUE by default. When disabled, the examples will not be built. See #93 for more information.
  • Misc. Bugfixes to bring netCDF-Fortran in line with the features in netCDF-C.
  • Updated CMakeLists.txt to check for C types that match Fortran ones. See GitHub #67 for more information.

4.4.4 Released May 13, 2016

  • Corrected an issue where cmake-based builds specifying USE_LOGGING were not seeing expected behavior. The issue was reported, and subsequently fixed, by Neil Carlson at Los Alamos Nat'l Laboratory. See Github Pull Request #44 for more information.
  • Integrated improvements provided by Richard Weed. For a complete list of modifications, see the file docs/netcdf_fortran_4.4.2dev_notes_RW.pdf. It is highly detailed and worth reading!

    The highlights of the improvements are as follows:

    • Explicit dependencies on NC_MAX_DIM constant for arrays has been removed and replaced with dynamically-allocated arrays.
    • Support for nc_open_mem() in the C library, allowing for the creation of "in memory" files.
    • General clean up.

4.4.3 Released 2016-01-20

  • Corrected a bug which would return a false-positive in nf_test when using netCDF-C 4.4.0.
  • Updated the cfortran.doc license document for the cfortran.h library. The most recent version was pulled from The previous version did not reflect that the author had released cfortran under the LGPL. See Github Issue 27 for more information.

4.4.2 Released 2015-02-02

  • Added infrastructure to support the new netcdf-c option, ENABLE_REMOTE_FORTRAN_BOOTSTRAP.
  • Incorporated changes submitted by Nico Schlomer which extends the cmake compatibility between netcdf-c and netcdf-fortran.
  • Incorporated a patch submitted by Thomas Jahns which fixed FC being unconditionally overwritten by F77 when Fortran 90 was disabled.

4.4.1 Released 2014-09-09

  • No significant changes from RC1.

4.4.1-RC1 Released 2014-08-05

  • Added a new variable for cmake-based builds, NC_EXTRA_DEPS. Use this to specify additional dependencies when linking against a static netcdf-c library, e.g.
netcdf-fortran/build$ cmake .. -dnc_extra_deps="-lhdf5 -lhdf5_hl -lcurl"
  • Fixed to build correctly with netCDF-3-only C library, for example C library configured with –disable-netcdf-4 (R. Weed).

4.4 Released 2014-07-08

  • For 32-bit platforms fixed integer fill parameters, initialized potentially unitialized variables, and provided some missing defaults (R. Weed).
  • Fixed CMake builds on 32-bit platforms.
  • Added new inq_path and rename_grps functions analogous to corresponding C functions. Added associated tests (R. Weed).
  • Added support for NF_MPIIO, NF_MPIPOSIX, NF_PNETCDF flags and NF_FILL_UINT. (R. Weed)
  • Fixed potential bug in attribute functions for integer values when Fortran INTEGER*1 or INTEGER*2 types are the same size as C long (R. Weed).
  • Added test for compiler support of Fortran 2008 ISO_FORTRAN_ENV additions and TS29113 standard extension.
  • Fixed C_PTR_DIFF_T issue reported by Orion Poplowski (R. Weed).

4.4-rc1 Released 2013-10-06

  • Added doxygen-generated documentation, using the --enable-doxygen and -DENABLE_DOXYGEN flags for autotools and cmake-based builds, respectively.
  • Added missing error codes for DAP and some netCDF-4 errors
  • Fixed some documentation for F77 API, added make rule for creating netcdf-f77 HTML files.

4.4-beta5 Released 2013-08-27

  • Added configuration files to github distribution.


  • Moved to GitHub from Subversion, the location of the new GitHub repository is at:
  • Parallel-build portability fixes, particularly for OpenMPI and gcc/gfortran-4.8.x on the Mac. Also added test from Reto Stöckli for NCF-250 bug, demonstrating it was fixed in previous commit.
  • Add support for NF_MPIIO, NF_MPIPOSIX, NF_PNETCDF, and NF_FILL_UINT in the data files.
  • Add support for nf_inq_path.
  • Add a pre-processor macro that can be used to bypass the home-brew C_PTRDIFF_T definition and use the standard one for compilers that support it.
  • Fix a potential bug in nf_attio to call the _long version of some puts/gets instead of the _int version. These were inside INT1_IS_C_LONG and INT2_IS_C_LONG ifdef blocks so they would have only showed up when those macros were true.

4.4-beta3 Released 2012-12-07

  • Fixed bug that "make -j check" fails, but "make check" works fine.
  • Fixed build problems resulting from syncing with separate C distribution.
  • Synchronize with all changes made to version 4.2 since ts release.

4.4-beta2 Released 2012-06-29

  • Made handling of –disable-f03 more transparent.
  • Fixed adding flags for parallel I/O for MPI from David Warren.
  • Removed all the old C code that's not needed for this separate distribution.
  • Inadvertently broke the build until syncing with C distribution in later beta release.

4.4-beta1 Released 2012-03-02

  • Fortran 2003 Support

    Version 4.4 is the first release to support fortran 2003 and to use the ISO C Bindings available in fortran 2003 to replace the older C code wrappers.

    Congratulations and thanks to Richard Weed at Mississippi State University, who is the author of new code.

    See the file README_F03_MODS for a more complete description of the changes. Many changes to the build structure have been made at the same time as the new 2003 code has been inserted.

    As part of the fortran 2003 refactor, the directory structure has been significantly modified. All the previous F90 C wrapper code has been moved to the "libsrc" directory.

    All of the fortran code has been moved to the "fortran" directory. The directories names F77 and F90 have been removed. The most important consequence of this refactor is that pure Fortran77 compilers are no longer supported. It is assumed that the compiler supports at least Fortran 90 and also Fortran 77. If it also supports the ISO C Bindings, then the new 2003 code is used instead of the older C wrappers.

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