NetCDF  4.6.2.1
RELEASE_NOTES.md
1 Release Notes {#RELEASE_NOTES}
2 =============
3 
4 \brief Release notes file for the netcdf-c package.
5 
6 This file contains a high-level description of this package's evolution. Releases are in reverse chronological order (most recent first). Note that, as of netcdf 4.2, the `netcdf-c++` and `netcdf-fortran` libraries have been separated into their own libraries.
7 
8 ## 4.6.3 - TBD
9 
10 ## 4.6.2.1 - February 15, 2019
11 
12 ### Maintenance Release
13 
14 * Update the license from the home-brewed NetCDF license to the standard 3-Clause BSD License. This change does not result in any new restrictions; it is merely the adoption of a standard, well-known and well-understood license in place of the historic NetCDF license written at Unidata. This is part of a broader push by Unidata to adopt modern, standardized licensing.
15 * [BugFix] Corrected DAP-releated issues on big-endian machines. See [Github #1321](https://github.com/Unidata/netcdf-c/issues/1321), [Github #1302](https://github.com/Unidata/netcdf-c/issues/1302) for more information.
16 * [BugFix][Enhancement] Various and sundry bugfixes and performance enhancements, thanks got @edhartnett, @gsjaardema, @t-b, @wkliao, and all of our other contributors.
17 * [Enhancement] Extended `nccopy -F` syntax to support multiple variables with a single invocation. See [Github #1311](https://github.com/Unidata/netcdf-c/issues/1311) for more information.
18 * [BugFix] Corrected an issue where DAP2 was incorrectly converting signed bytes, resulting in an erroneous error message under some circumstances. See [GitHub #1317](https://github.com/Unidata/netcdf-c/issues/1317) for more information. See [Github #1319](https://github.com/Unidata/netcdf-c/issues/1319) for related information.
19 * [BugFix][Enhancement] Modified `nccopy` so that `_NCProperties` is not copied over verbatim but is instead generated based on the version of `libnetcdf` used when copying the file. Additionally, `_NCProperties` are displayed if/when associated with a netcdf3 file, now. See [GitHub #803](https://github.com/Unidata/netcdf-c/issues/803) for more information.
20 
21 ## 4.6.2 - November 16, 2018
22 
23 * [Enhancement] Lazy att read - only read atts when user requests one of them. See [GitHub #857](https://github.com/Unidata/netcdf-c/issues/857).
24 * [Enhancement] Fast global att read - when global atts are read, they are read much more quickly. See [GitHub #857](https://github.com/Unidata/netcdf-c/issues/857).
25 
26 ## 4.6.2-rc2 November 1, 2018
27 
28 
29 * [Enhancement] Add nccopy command options for per-variable chunk sizing, and minimum chunk size. See [GitHub #1087](https://github.com/Unidata/netcdf-c/pull/1087).
30 * [Bug Fix] Fix nccopy handling of user specified chunk sizes. See [GitHub #725](https://github.com/Unidata/netcdf-c/issues/725),[#1087](https://github.com/Unidata/netcdf-c/issues/1087).
31 * [Bug Fix] Avoid limit on number of times a netCDF4 attribute can be updated. Not a complete fix for the HDF5 "maximum creation order" problem, but should greatly reduce occurrences in many real-world cases. See [GitHub #350](https://github.com/Unidata/netcdf-c/issues/350).
32 * [Bug Fix] The use of NC_DISKLESS has been modified to make it cleaner. This adds a new flag called NC_PERSIST that takes over the now obsolete NC_MPIPOSIX.
33 * [Obsolete] Obsolete the MPIPOSIX flag.
34 * [Bug Fix] When using filters with HDF5 1.10.x or later, it is necessary to utilize the HDF5 replacements for malloc, realloc, and free in the filter code.
35 
36 ## 4.6.2-rc1 - September 19, 2018
37 
38 * [Enhancement] Create a new version of _NCProperties provenance attribute. This version (version 2) supports arbitrary key-value pairs. It is the default when new files are created. Version 1 continues to be accepted.
39 * [Enhancement] Allow user to set http read buffersize for DAP2 and DAP4 using the tag HTTP.READ.BUFFERSIZE in the .daprc file.
40 * [Enhancement] Allow user to set http keepalive for DAP2 and DAP4 using the tag HTTP.KEEPALIVE in the .daprc file (see the OPeNDAP documentation for details).
41 * [Enhancement] Support DAP4 remote tests using a new remote test server locatedon the Unidata JetStream project.
42 * [Enhancement] Improved the performance of the nc_get/put_vars operations by using the equivalent slab capabilities of hdf5. Result is a significant speedup of these operations. See [GitHub #1001](https://github.com/Unidata/netcdf-c/pull/1001) for more information.
43 * [Enhancement] Expanded the capabilities of `NC_INMEMORY` to support writing and accessing the final modified memory. See [GitHub #879](https://github.com/Unidata/netcdf-c/pull/879) for more information.
44 * [Enhancement] Made CDF5 support enabled by default. See [Github #931](https://github.com/Unidata/netcdf-c/issues/931) for more information.
45 * [Bug Fix] Corrected a number of memory issues identified in `ncgen`. See [GitHub #558 for more information](https://github.com/Unidata/netcdf-c/pull/558).
46 
47 ## 4.6.1 - March 19, 2018
48 
49 * [Bug Fix] Corrected an issue which could result in a dap4 failure. See [Github #888](https://github.com/Unidata/netcdf-c/pull/888) for more information.
50 * [Bug Fix][Enhancement] Allow `nccopy` to control output filter suppresion. See [Github #894](https://github.com/Unidata/netcdf-c/pull/894) for more information.
51 * [Enhancement] Reverted some new behaviors that, while in line with the netCDF specification, broke existing workflows. See [Github #843](https://github.com/Unidata/netcdf-c/issues/843) for more information.
52 * [Bug Fix] Improved support for CRT builds with Visual Studio, improves zlib detection in hdf5 library. See [Github #853](https://github.com/Unidata/netcdf-c/pull/853) for more information.
53 * [Enhancement][Internal] Moved HDF4 into a distinct dispatch layer. See [Github #849](https://github.com/Unidata/netcdf-c/pull/849) for more information.
54 
55 ## 4.6.0 - January 24, 2018
56 * [Enhancement] Full support for using HDF5 dynamic filters, both for reading and writing. See the file docs/filters.md.
57 * [Enhancement] Added an option to enable strict null-byte padding for headers; this padding was specified in the spec but was not enforced. Enabling this option will allow you to check your files, as it will return an E_NULLPAD error. It is possible for these files to have been written by older versions of libnetcdf. There is no effective problem caused by this lack of null padding, so enabling these options is informational only. The options for `configure` and `cmake` are `--enable-strict-null-byte-header-padding` and `-DENABLE_STRICT_NULL_BYTE_HEADER_PADDING`, respectively. See [Github #657](https://github.com/Unidata/netcdf-c/issues/657) for more information.
58 * [Enhancement] Reverted behavior/handling of out-of-range attribute values to pre-4.5.0 default. See [Github #512](https://github.com/Unidata/netcdf-c/issues/512) for more information.
59 * [Bug] Fixed error in tst_parallel2.c. See [Github #545](https://github.com/Unidata/netcdf-c/issues/545) for more information.
60 * [Bug] Fixed handling of corrupt files + proper offset handling for hdf5 files. See [Github #552](https://github.com/Unidata/netcdf-c/issues/552) for more information.
61 * [Bug] Corrected a memory overflow in `tst_h_dimscales`, see [Github #511](https://github.com/Unidata/netcdf-c/issues/511), [Github #505](https://github.com/Unidata/netcdf-c/issues/505), [Github #363](https://github.com/Unidata/netcdf-c/issues/363) and [Github #244](https://github.com/Unidata/netcdf-c/issues/244) for more information.
62 
63 ## 4.5.0 - October 20, 2017
64 
65 * Corrected an issue which could potential result in a hang while using parallel file I/O. See [Github #449](https://github.com/Unidata/netcdf-c/pull/449) for more information.
66 * Addressed an issue with `ncdump` not properly handling dates on a 366 day calendar. See [GitHub #359](https://github.com/Unidata/netcdf-c/issues/359) for more information.
67 
68 ### 4.5.0-rc3 - September 29, 2017
69 
70 * [Update] Due to ongoing issues, native CDF5 support has been disabled by **default**. You can use the options mentioned below (`--enable-cdf5` or `-DENABLE_CDF5=TRUE` for `configure` or `cmake`, respectively). Just be aware that for the time being, Reading/Writing CDF5 files on 32-bit platforms may result in unexpected behavior when using extremely large variables. For 32-bit platforms it is best to continue using `NC_FORMAT_64BIT_OFFSET`.
71 * [Bug] Corrected an issue where older versions of curl might fail. See [GitHub #487](https://github.com/Unidata/netcdf-c/issues/487) for more information.
72 * [Enhancement] Added options to enable/disable `CDF5` support at configure time for autotools and cmake-based builds. The options are `--enable/disable-cdf5` and `ENABLE_CDF5`, respectively. See [Github #484](https://github.com/Unidata/netcdf-c/issues/484) for more information.
73 * [Bug Fix] Corrected an issue when subsetting a netcdf3 file via `nccopy -v/-V`. See [Github #425](https://github.com/Unidata/netcdf-c/issues/425) and [Github #463](https://github.com/Unidata/netcdf-c/issues/463) for more information.
74 * [Bug Fix] Corrected `--has-dap` and `--has-dap4` output for cmake-based builds. See [GitHub #473](https://github.com/Unidata/netcdf-c/pull/473) for more information.
75 * [Bug Fix] Corrected an issue where `NC_64BIT_DATA` files were being read incorrectly by ncdump, despite the data having been written correctly. See [GitHub #457](https://github.com/Unidata/netcdf-c/issues/457) for more information.
76 * [Bug Fix] Corrected a potential stack buffer overflow. See [GitHub #450](https://github.com/Unidata/netcdf-c/pull/450) for more information.
77 
78 ### 4.5.0-rc2 - August 7, 2017
79 
80 * [Bug Fix] Addressed an issue with how cmake was implementing large file support on 32-bit systems. See [GitHub #385](https://github.com/Unidata/netcdf-c/issues/385) for more information.
81 * [Bug Fix] Addressed an issue where ncgen would not respect keyword case. See [GitHub #310](https://github.com/Unidata/netcdf-c/issues/310) for more information.
82 
83 ### 4.5.0-rc1 - June 5, 2017
84 
85 * [Enhancement] DAP4 is now included. Since dap2 is the default for urls, dap4 must be specified by
86 (1) using "dap4:" as the url protocol, or
87 (2) appending "#protocol=dap4" to the end of the url, or
88 (3) appending "#dap4" to the end of the url
89 Note that dap4 is enabled by default but remote-testing is
90 disbled until the testserver situation is resolved.
91 * [Enhancement] The remote testing server can now be specified with the `--with-testserver` option to ./configure.
92 * [Enhancement] Modified netCDF4 to use ASCII for NC_CHAR. See [Github Pull request #316](https://github.com/Unidata/netcdf-c/pull/316) for more information.
93 * [Bug Fix] Corrected an error with how dimsizes might be read. See [Github #410](https://github.com/unidata/netcdf-c/issues/410) for more information.
94 * [Bug Fix] Corrected an issue where 'make check' would fail if 'make' or 'make all' had not run first. See [Github #339](https://github.com/Unidata/netcdf-c/issues/339) for more information.
95 * [Bug Fix] Corrected an issue on Windows with Large file tests. See [Github #385](https://github.com/Unidata/netcdf-c/issues/385]) for more information.
96 * [Bug Fix] Corrected an issue with diskless file access, see [Pull Request #400](https://github.com/Unidata/netcdf-c/issues/400) and [Pull Request #403](https://github.com/Unidata/netcdf-c/issues/403) for more information.
97 * [Upgrade] The bash based test scripts have been upgraded to use a common test_common.sh include file that isolates build specific information.
98 * [Upgrade] The bash based test scripts have been upgraded to use a common test_common.sh include file that isolates build specific information.
99 * [Refactor] the oc2 library is no longer independent of the main netcdf-c library. For example, it now uses ncuri, nclist, and ncbytes instead of its homegrown equivalents.
100 * [Bug Fix] `NC_EGLOBAL` is now properly returned when attempting to set a global `_FillValue` attribute. See [GitHub #388](https://github.com/Unidata/netcdf-c/issues/388) and [GitHub #389](https://github.com/Unidata/netcdf-c/issues/389) for more information.
101 * [Bug Fix] Corrected an issue where data loss would occur when `_FillValue` was mistakenly allowed to be redefined. See [Github #390](https://github.com/Unidata/netcdf-c/issues/390), [GitHub #387](https://github.com/Unidata/netcdf-c/pull/387) for more information.
102 * [Upgrade][Bug] Corrected an issue regarding how "orphaned" DAS attributes were handled. See [GitHub #376](https://github.com/Unidata/netcdf-c/pull/376) for more information.
103 * [Upgrade] Update utf8proc.[ch] to use the version now maintained by the Julia Language project (https://github.com/JuliaLang/utf8proc/blob/master/LICENSE.md).
104 * [Bug] Addressed conversion problem with Windows sscanf. This primarily affected some OPeNDAP URLs on Windows. See [GitHub #365](https://github.com/Unidata/netcdf-c/issues/365) and [GitHub #366](https://github.com/Unidata/netcdf-c/issues/366) for more information.
105 * [Enhancement] Added support for HDF5 collective metadata operations when available. Patch submitted by Greg Sjaardema, see [Pull request #335](https://github.com/Unidata/netcdf-c/pull/335) for more information.
106 * [Bug] Addressed a potential type punning issue. See [GitHub #351](https://github.com/Unidata/netcdf-c/issues/351) for more information.
107 * [Bug] Addressed an issue where netCDF wouldn't build on Windows systems using MSVC 2012. See [GitHub #304](https://github.com/Unidata/netcdf-c/issues/304) for more information.
108 * [Bug] Fixed an issue related to potential type punning, see [GitHub #344](https://github.com/Unidata/netcdf-c/issues/344) for more information.
109 * [Enhancement] Incorporated an enhancement provided by Greg Sjaardema, which may improve read/write times for some complex files. Basically, linked lists were replaced in some locations where it was safe to use an array/table. See [Pull request #328](https://github.com/Unidata/netcdf-c/pull/328) for more information.
110 
111 ## 4.4.1.1 - November 21, 2016
112 
113 * [Bug] Fixed an issue where `ncgen` would potentially crash or write incorrect netCDF4 binary data under very specific circumstances. This bug did *not* affect data written on 32-bit systems or by using the netCDF library; it was specific to `ncgen`. This would only happen when writing a compound data type containing an 8-byte data type followed by a 4-byte data type *and* the 4-byte data type was not properly aligned; this would *possibly* result in incorrect padding. This did not affect 32-bit systems, or data written directly by the library. See [GitHub #323](https://github.com/Unidata/netcdf-c/issues/323) for more information.
114 * [Documentation] Updated documentation related to netCDF variable names and DAP2 access to reflect the undefined behavior potentially observed when DAP2 reserved keywords are used as netCDF variable names. See [GitHub #308](https://github.com/Unidata/netcdf-c/issues/308) for more information.
115 * [Bug] Fixed an issue with `nc_inq_type()` not returning proper value in some circumstances. See [GitHub #317](https://github.com/Unidata/netcdf-c/issues/317) for more information.
116 * [Bug] Corrected an issue related to test failures when `--disable-utilities` or `-DENABLE_UTILITIES=OFF` are specified when building with autotools or cmake, respectively. See [GitHub #313](https://github.com/Unidata/netcdf-c/issues/313) for more information.
117 * [Bug][Enhancement] Corrected a behavioral issue with the `_NCProperties` attribute taking up too much space. See [GitHub #300](https://github.com/Unidata/netcdf-c/issues/300) and [GitHub #301](https://github.com/Unidata/netcdf-c/pull/301) for more information.
118 
119 * [Bug] Corrected behavior for `nc-config` so that, if `nf-config` is found in system, the proper fortran-related information will be conveyed. See [GitHub #296](https://github.com/Unidata/netcdf-c/issues/296] for more information.
120 
121 ## 4.4.1 - June 28, 2016
122 
123 * [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.
124 * [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.
125 
126 ### 4.4.1-RC3 - June 17, 2016
127 
128 * [Bug Fix] Misc. bug fixes and improvements.
129 * [Bug Fix] Corrected an issue where adding a \_FillValue attribute to a variable would result in other attributes being lost. See [GitHub #239](https://github.com/Unidata/netcdf-c/issues/239) for more details.
130 * [Bug Fix][Parallel I/O] Corrected an issue reported by Kent Yang at the HDF group related to Collective Parallel I/O and a potential hang.
131 
132 ### 4.4.1-RC2 - May 13, 2016
133 
134 * [Enhancement] Added provenance information to files created. This information consists of a persistent attribute named `_NCProperties` plus two computed attributes, `_IsNetcdf4` and `_SuperblockVersion`. Associated documentation was added to the file `docs/attribute_conventions.md`. See [GitHub pull request #260](https://github.com/Unidata/netcdf-c/pull/260) for more information.
135 * [Bug Fix] Cleaned up some dead links in the doxygen-generated documentation.
136 * [Bug Fix] Corrected several issues related to building under Visual Studio 2014.
137 * [Bug Fix] Corrected several test failures related to HDF5 `1.10.0`
138 * [Bug Fix] Reverted SOVersion *current* to 11 from 12; it was incorrectly incremented in netCDF-C release 4.4.1-RC1.
139 * [Enhancement][Windows] Bumped the included libhdf5 to 1.8.16 from 1.8.15 for pre-built Visual Studio installer files.
140 
141 
142 ### 4.4.1-RC1 - April 15, 2016
143 
144 * [Bug Fix][Enhancement] Fixed an issue with netCDF4 files generated using version `1.10.0` of the HDF5 library. The 1.10 release potentially changed the underlying file format, introducing a backwards compatibility issue with the files generated. HDF5 provided an API for retaining the 1.8.x file format, which is now on by default. See [GitHub Issue #250](https://github.com/Unidata/netcdf-c/issues/250) for more information.
145 * [Bug Fix] Corrected an issue with autotools-based builds performed out-of-source-tree. See [GitHub Issue #242](https://github.com/Unidata/netcdf-c/issues/242) for more information.
146 * [Enhancement] Modified `nc_inq_type()` so that it would work more broadly without requiring a valid ncid. See [GitHub Issue #240](https://github.com/Unidata/netcdf-c/issues/240) for more information.
147 * [Enhancement] Accepted a patch code which added a hashmap lookup for rapid var and dim retrieval in nc3 files, contributed by Greg Sjaardema. See [GitHub Pull Request #238](https://github.com/Unidata/netcdf-c/pull/238) for more information.
148 * [Bug Fix] Accepted a contributed pull request which corrected an issue with how the cmake-generated `nc-config` file determined the location of installed files. See [GitHub Pull Request #235](https://github.com/Unidata/netcdf-c/pull/235) for more information.
149 * [Enhancement] Added an advanced option for CMake-based builds, `ENABLE_SHARED_LIBRARY_VERSION`. This option is `ON` by default, but if turned off, only `libnetcdf.dylib` will be generated, instead of files containing the SOVERSION in the file name. This is a requested feature most people might not care about. See [GitHub #228](https://github.com/Unidata/netcdf-c/issues/228) for more information.
150 * [Bug Fix] Corrected an issue with duplicated error codes defined in multiple header files. See [GitHub #213](https://github.com/Unidata/netcdf-c/issues/213) for more information.
151 * [Bug Fix] Addressed an issue specific to Visual Studio 2015 on Windows. On very large files, some calls to the `fstat` class of functions would fail for no apparent reason. This behavior was **not** observed under Visual Studio 2013. This has now been mitigated. See [GitHub #188](https://github.com/Unidata/netcdf-c/issues/188) for more information.
152 * [Enhancement] Updated `nc-config` to report whether `logging` is enabled in netcdf. Additionally, if `f03` is available in an installed netcdf-fortran library, it will now be reported as well.
153 * [Bug Fix] Addressed an issue where `netcdf_mem.h` was not being installed by cmake. See [GitHub #227](https://github.com/Unidata/netcdf-c/issues/227) for more information.
154 * [Bug Fix] Addressed an issue where `ncdump` would crash when trying to read a netcdf file containing an empty ragged `VLEN` variable in an unlimited dimension. See [GitHub #221](https://github.com/Unidata/netcdf-c/issues/221) for more information.
155 
156 ## 4.4.0 Released - January 13, 2016
157 
158 * Bumped SO version to 11.0.0.
159 
160 * Modified `CMakeLists.txt` to work with the re-organized cmake configuration used by the latest HDF5, `1.8.16`, on Windows. Before this fix, netCDF would fail to locate hdf5 1.8.16 when using cmake on Windows. See [GitHub #186](https://github.com/Unidata/netcdf-c/issues/186) for more information.
161 
162 * Addressed an issue with `ncdump` when annotations were used. The indices for the last row suffered from an off-by-1 error. See [GitHub issue #181](https://github.com/Unidata/netcdf-c/issues/181) for more information.
163 
164 * Addressed an issue on platforms where `char` is `unsigned` by default (such as `ARM`), as well as an issue describing regarding undefined behavior, again on `ARM`. See [GitHub issue #159](https://github.com/Unidata/netcdf-c/issues/159) for detailed information.
165 
166 * Fixed an ambiguity in the grammar for cdl files. See [GitHub #178](https://github.com/Unidata/netcdf-c/issues/178) for more information.
167 
168 * Updated documentation for `nc_get_att_string()` to reflect the fact that it returns allocated memory which must be explicitly free'd using `nc_free_string()`. Reported by Constantine Khroulev, see [GitHub Issue 171](https://github.com/Unidata/netcdf-c/issues/171) for more information.
169 
170 * Modified ncgen to properly handle the L and UL suffixes for integer constants
171  to keep backward compatibility. Now it is the case the single L suffix
172  (e.g. 111L) is treated as a 32 bit integer. This makes it consistent with
173  the fact that NC_LONG (netcdf.h) is an alias for NC_INT. Existing .cdl
174  files should be examined for occurrences of the L prefix to ensure that
175  this change will not affect them.
176  (see Github issue 156[https://github.com/Unidata/netcdf-c/issues/156]).
177 
178 * Updated documentation to reference the new `NodeJS` interface to netcdf4, by Sven Willner. It is available from [https://www.npmjs.com/package/netcdf4](https://www.npmjs.com/package/netcdf4) or from the GitHub repository at [https://github.com/swillner/netcdf4-js](https://github.com/swillner/netcdf4-js).
179 
180 * Incorporated pull request https://github.com/Unidata/netcdf-c/pull/150 from Greg Sjaardema to remove the internal hard-wired use of `NC_MAX_DIMS`, instead using a dynamic memory allocation.
181 
182 ### 4.4.0-RC5 Released - November 11, 2015
183 
184 * Added a fix for https://github.com/Unidata/netcdf-c/issues/149, which was reported several times in quick succession within an hour of the RC4 release.
185 
186 ### 4.4.0-RC4 Released - November 10, 2015
187 
188 * Added CDM-5 support via new mode flag called NC_64BIT_DATA (alias NC_CDF5).
189 
190  Major kudos to Wei-Keng Liao for all the effort he put into getting this to work.
191 
192  This cascaded into a number of other changes.
193 
194  1. Renamed libsrcp5 -> libsrcp because PnetCDF can do parallel io for CDF-1, CDF-2 and CDF-5, not just CDF-5.
195  2. Given #1, then the NC_PNETCDF mode flag becomes a subset of NC_MPIIO, so made NC_PNETCDF an alias for NC_MPII.
196  3. NC_FORMAT_64BIT is now deprecated. Use NC_FORMAT_64BIT_OFFSET.
197 
198 Further information regarding the CDF-5 file format specifrication may be found here: http://cucis.ece.northwestern.edu/projects/PnetCDF/CDF-5.html
199 
200 * Modified configure.ac to provide finer control over parallel
201  support. Specifically, add flags for:
202 
203  1. HDF5_PARALLEL when hdf5 library has parallel enabled
204  2. --disable-parallel4 to be used when we do not want
205  netcdf-4 to use parallelism even if hdf5 has it enabled.
206 
207 
208 * Deprecating various extended format flags.
209 
210 The various extended format flags of the format `NC_FORMAT_FOO` have been refactored into the form `NC_FORMATX_FOO`. The old flags still exist but have been marked as deprecated and will be removed at some point. This was done to avoid confusion between the extended format flags and the format flags `NC_FORMAT_CLASSIC`, `NC_FORMAT_64BIT_OFFSET`, etc. The mapping of deprecated-to-new flags is as follows:
211 
212 Deprecated | Replaced with
213 -----------|-------------
214 NC\_FORMAT\_NC3 | NC\_FORMATX\_NC3
215 NC\_FORMAT\_NC\_HDF5 | NC\_FORMATX\_NC\_HDF5
216 NC\_FORMAT\_NC4 | NC\_FORMATX\_NC4
217 NC\_FORMAT\_NC\_HDF4 | NC\_FORMATX\_NC\_HDF4
218 NC\_FORMAT\_PNETCDF | NC\_FORMATX\_PNETCDF
219 NC\_FORMAT\_DAP2 | NC\_FORMATX\_DAP2
220 NC\_FORMAT\_DAP4 | NC\_FORMATX\_DAP4
221 NC\_FORMAT\_UNDEFINED | NC\_FORMATX\_UNDEFINED
222 
223 * Reduced minimum cmake version to `2.8.11` from `2.8.12`. This will allow for cmake use on a broader set of popular linux platforms without having to do a custom cmake install. See https://github.com/Unidata/netcdf-c/issues/135 for more information.
224 
225 * The documentation section `The Default Chunking Scheme` has been updated with more information. This lives in the `guide.dox` file in the `docs/` directory, or can be found online in the appropriate location (typically http://www.unidata.ucar.edu/netcdf/docs/), once this release has been published.
226 
227 ### 4.4.0-RC3 2015-10-08
228 
229 * Addressed an inefficiency in how bytes would be swapped when converting between `LITTLE` and `BIG` ENDIANNESS. See [NCF-338](https://bugtracking.unidata.ucar.edu/browse/NCF-338) for more information.
230 
231 * Addressed an issue where an interrupted read on a `POSIX` system would return an error even if errno had been properly set to `EINTR`. This issue was initially reported by David Knaak at Cray. More information may be found at [NCF-337](https://bugtracking.unidata.ucar.edu/browse/NCF-337).
232 
233 * Added a note to the install directions pointing out that parallel make
234 cannot be used for 'make check'.
235 
236 ### 4.4.0-RC2 Released 2015-07-09
237 
238 * Minor bug fixes and cleanup of issues reported with first release candidate.
239 
240 ### 4.4.0-RC1 Released 2015-06-09
241 
242 * The pre-built Windows binaries are now built using `Visual Studio 2012`, instead of `Visual Studio 2010`. Source-code compilation remains function with `Visual Studio 2010`, this is just a change in the pre-built binaries.
243 
244 * Added support for opening in-memory file content. See `include/netcdf_mem.h` for the procedure signature. Basically, it allows one to fill a chunk of memory with the equivalent of some netCDF file and then open it and read from it as if it were any other file. See [NCF-328](https://bugtracking.unidata.ucar.edu/browse/NCF-328) for more information.
245 
246 * Addressed an issue when reading hdf4 files with explicit little-endian datatypes. This issue was [reported by Tim Burgess at GitHub](https://github.com/Unidata/netcdf-c/issues/113). See [NCF-332](https://bugtracking.unidata.ucar.edu/browse/NCF-332) for more information.
247 
248 * Addressed an issue with IBM's `XL C` compiler on AIX and how it handled some calls to malloc. Also, as suggested by Wolfgang Hayek, developers using this compiler may need to pass `CPPFLAGS=-D_LINUX_SOURCE_COMPAT` to avoid some test failures.
249 
250 * Addressed an issure in netcdf4 related to specifying an endianness explicitly. When specifying an endianness for `NC_FLOAT`, the value would appear to not be written to file, if checked with `ncdump -s`. The issue was more subtle; the value would be written but was not being read from file properly for non-`NC_INT`. See [GitHub Issue](https://github.com/Unidata/netcdf-c/issues/112) or [NCF-331](https://bugtracking.unidata.ucar.edu/browse/NCF-331) for more information.
251 
252 * Addressed an issue in netcdf4 on Windows w/DAP related to how byte values were copied with sscanf. Issue originally reported by Ellen Johnson at Mathworks, see [NCF-330](https://bugtracking.unidata.ucar.edu/browse/NCF-330) for more information.
253 
254 * Addressed in issue in netcdf4 files on Windows, built with Microsoft Visual Studio, which could result in a memory leak. See [NCF-329](https://bugtracking.unidata.ucar.edu/browse/NCF-329) for more information.
255 
256 * Addressed an issue in netcdf4 files where writing unlimited dimensions that were not declared at head of the dimensions list, as reported by Ellen Johnson at Mathworks. See [NCF-326](https://bugtracking.unidata.ucar.edu/browse/NCF-326) for more information.
257 
258 * Added an authorization reference document as oc2/ocauth.html.
259 
260 * Fixed bug resulting in segmentation violation when trying to add a
261  _FillValue attribute to a variable in an existing netCDF-4 file
262  defined without it (thanks to Alexander Barth). See
263  [NCF-187](https://bugtracking.unidata.ucar.edu/browse/NCF-187) for
264  more information.
265 
266 ## 4.3.3.1 Released 2015-02-25
267 
268 * Fixed a bug related to renaming the attributes of coordinate variables in a subgroup. See [NCF-325](https://bugtracking.unidata.ucar.edu/browse/NCF-325) for more information.
269 
270 ## 4.3.3 Released 2015-02-12
271 
272 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-324)
273 
274 * Enabled previously-disabled shell-script-based tests for Visual Studio when `bash` is detected.
275 
276 ### 4.3.3-rc3 Released 2015-01-14
277 
278 * 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:
279 
280  * CMake: `-DENABLE_REMOTE_FORTRAN_BOOTSTRAP=ON`
281  * Autotools: `--enable-remote-fortran-bootstrap`
282 
283 Details are as follows:
284 
285 ----
286 
287 Enabling these options creates two new make targets:
288 
289 * `build-netcdf-fortran`
290 * `install-netcdf-fortran`
291 
292 Example Work Flow from netcdf-c source directory:
293 
294 * $ `./configure --enable-remote-fortran-bootstrap --prefix=$HOME/local`
295 * $ `make check`
296 * $ `make install`
297 * $ `make build-netcdf-fortran`
298 * $ `make install-netcdf-fortran`
299 
300 > 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.<br><br>
301 
302 > 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](https://bugtracking.unidata.ucar.edu/browse/NCF-323)
303 
304 ----
305 
306 * 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.
307 
308 * 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.
309 
310 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-319)
311 
312 * In nccopy utility, provided proper default for unlimited dimension in chunk-size specification instead of requiring explicit chunk size. Added associated test. [NCF-321](https://bugtracking.unidata.ucar.edu/browse/NCF-321)
313 
314 * Fixed documentation typo in FILL_DOUBLE definition in classic format specification grammar. Fixed other typos and inconsistencies in Doxygen version of User Guide.
315 
316 * For nccopy and ncgen, added numeric options (-3, -4, -6, -7) for output format, to provide less confusing format version specifications than the error-prone equivalent -k options (-k1, -k2, -k3, -k4). The new numeric options are compatible with NCO's mnemonic version options. The old -k numeric options will still be accepted but are deprecated, due to easy confusion between format numbers and format names. [NCF-314](https://bugtracking.unidata.ucar.edu/browse/NCF-314)
317 
318 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-318)
319 
320 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-317)
321 
322 * Added a new option, `NC_EXTRA_DEPS`, for cmake-based builds. This is analogous to `LIBS` in autotools-based builds. Example usage:
323 
324  $ cmake .. -NC_EXTRA_DEPS="-lcustom_lib"
325 
326 More details may be found at the Unidata JIRA Dashboard. [NCF-316](https://bugtracking.unidata.ucar.edu/browse/NCF-316)
327 
328 
329 ### 4.3.3-rc2 Released 2014-09-24
330 
331 * Fixed the code for handling character constants
332  in datalists in ncgen. Two of the problems were:
333  1. It failed on large constants
334  2. It did not handle e.g. var = 'a', 'b', ...
335  in the same way that ncgen3 did.
336  See [NCF-309](https://bugtracking.unidata.ucar.edu/browse/NCF-309).
337 
338 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-313).
339 
340  > Determining the presence of `netcdf_meta.h` can also be accomplished by methods common to autotools and cmake-based build systems.
341 
342 * Changed `Doxygen`-generated documentation hosted by Unidata to use more robust server-based searching.
343 * Corrected embedded URLs in release notes.
344 * Corrected an issue where building with HDF4 support with Visual Studio would fail.
345 
346 ### 4.3.3-rc1 Released 2014-08-25
347 
348 * Added `CMake`-based export files, contributed by Nico Schlömer. See https://github.com/Unidata/netcdf-c/pull/74.
349 
350 * Documented that ncgen input can come from standard input.
351 
352 * Regularized generation of libnetcdf.settings file to make parsing it easier.
353 
354 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-310)
355 
356 * Converted the [Manually-maintained FAQ page](http://www.unidata.ucar.edu/software/netcdf/docs/faq.html) 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.
357 
358 * 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.
359 
360 * 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.
361  [NCF-308](https://bugtracking.unidata.ucar.edu/browse/NCF-308)
362 
363 * 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.
364 
365 * 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](https://github.com/Unidata/netcdf-c/pull/64)
366 
367 * Replaced the `NetCDF Library Architecture` image with an updated version from the 2012 NetCDF Workshop slides.
368 
369 * Fix HDF4 files to support chunking.
370  [NCF-272](https://bugtracking.unidata.ucar.edu/browse/NCF-272)
371 
372 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-303).
373 
374 
375 * Renamed `man4/` directory to `docs/` to make the purpose and contents clearer. See [man4 vs. docs #60](https://github.com/Unidata/netcdf-c/issues/60).
376 
377 * Removed redundant variable `BUILD_DOCS` from the CMake configuration file. See the issue at github: [#59](https://github.com/Unidata/netcdf-c/issues/59).
378 
379 * 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](https://github.com/Unidata/netcdf-c/issues/56)
380 
381 * 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.
382 
383 ## 4.3.2 Released 2014-04-23
384 
385 * 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.
386 
387 * The oc .dodsrc reader was improperly handling the user name and password entries. [NCF-299](https://bugtracking.unidata.ucar.edu/browse/NCF-299)
388 
389 * 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:
390 
391  * `NC_TEST_DROP_SITE` - Specify an alternative Dashboard by URL or IP address.
392 
393  * `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.
394 
395 * Return an error code on open instead of an assertion violation for truncated file.
396 
397 * Documented limit on number of Groups per netCDF-4 file (32767).
398 
399 ### 4.3.2-rc2 Released 2014-04-15
400 
401 * Cleaned up a number of CMake inconsistencies related to CMake usage, parallel builds.
402 * Now passing -Wl,--no-undefined to linker when appropriate.
403 * Corrected an issue preventing large file tests from running correctly under Windows.
404 * Misc Bug Fixes detected by static analysis.
405 
406 ### 4.3.2-rc1 Released 2014-03-20
407 
408 * Pre-built Windows downloads will now be bundled with the latest (as of the time of this writing) versions of the various dependencies:
409  * `hdf5: 1.8.12`
410  * `zlib: 1.2.8`
411  * `libcurl: 7.35.0`
412 
413 * 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):
414  * --enable-dap-auth-tests
415  * -DENABLE\_DAP\_AUTH\_TESTS
416 
417 * Fixed small default chunk size for 1-dimensional record variables. [NCF-211](https://bugtracking.unidata.ucar.edu/browse/NCF-211)
418 
419 * Cleaned up type handling in netCDF-4 to fix bugs with fill-values.
420 
421 * Corrected "BAIL" macros to avoid infinite loop when logging is disabled and an error occurs.
422 
423 * 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.
424 
425 * Made type structure sharable by committed datatypes and variables that use it.
426 
427 * Handled string datatypes correctly, particularly for fill value attributes. Expanded testing for string fill values.
428 
429 * Simplified iteration of objects in the file when it's opened, tracking fewer objects and using less memory.
430 
431 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-290)
432 
433 * 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](https://bugtracking.unidata.ucar.edu/browse/NCF-288)
434 
435 * Addressed an issue related to old DAP servers. [NCF-287](https://bugtracking.unidata.ucar.edu/browse/NCF-287)
436 
437 * Modified nc_{get/put}_vars to no longer use
438  nc_get/put_varm. They now directly use nc_get/put_vara
439  directly. This means that nc_get/put_vars now work
440  properly for user defined types as well as atomic types.
441  [NCF-228] (https://bugtracking.unidata.ucar.edu/browse/NCF-228)
442 
443 ## 4.3.1.1 Released 2014-02-05
444 
445 This is a bug-fix-only release for version 4.3.1.
446 
447 * Corrected a DAP issue reported by Jeff Whitaker related to non-conforming servers.
448 
449 * Corrected an issue with DAP tests failing in a 64-bit Cygwin environment. [NCF-286](https://bugtracking.unidata.ucar.edu/browse/NCF-286)
450 
451 ## 4.3.1 Released 2014-01-16
452 
453 * Add an extended format inquiry method to the netCDF API: nc\_inq\_format\_extended. NC\_HAVE\_INQ\_FORMAT\_EXTENDED is defined in netcdf.h [NCF-273]
454 
455 [NCF-273]:https://bugtracking.unidata.ucar.edu/browse/NCF-273
456 
457 
458 ### 4.3.1-rc6 Released 2013-12-19
459 
460 * Fixed fill value handling for string types in nc4\_get\_vara().
461 
462 * Corrected behavior of nc\_inq\_unlimdim and nv\_inq\_unlimdims to report dimids
463  in same order as nc\_inq\_dimids.
464 
465 * Addressed an issue reported by Jeff Whitaker regarding `nc_inq_nvars` returning an incorrect number of dimensions (this issue was introduced in 4.3.1-rc5). Integrated a test contributed by Jeff Whitaker.
466 
467 * A number of previously-disabled unit tests were reviewed and made active.
468 
469 
470 ### 4.3.1-rc5 Released 2013-12-06
471 
472 * When opening a netCDF-4 file, streamline the iteration over objects in the underlying HDF5 file.
473 
474 * Fixed netCDF-4 failure when renaming a dimension and renaming a variable using that dimension, in either order. [NCF-177]
475 
476 [NCF-177]:https://bugtracking.unidata.ucar.edu/browse/NCF-177
477 
478 * When compiling with `hdf4` support, both autotools and cmake-based builds now properly look for the `libjpeg` dependency and will link against it when found (or complain if it's not). Also added `ENABLE_HDF4_FILE_TESTS` option to CMake-based builds.
479 
480 * Fixed bug in ncgen; it was not properly filling empty string constants ("") to be the proper length. [NCF-279]
481 
482 [NCF-279]:https://bugtracking.unidata.ucar.edu/browse/NCF-279
483 
484 * Fixed bug in ncgen where it was interpreting int64 constants
485  as uint64 constants. [NCF-278]
486 
487 [NCF-278]:https://bugtracking.unidata.ucar.edu/browse/NCF-278
488 
489 * Fixed bug in handling Http Basic Authorization. The code was actually there but was not being executed. [NCF-277]
490 
491 [NCF-277]:https://bugtracking.unidata.ucar.edu/browse/NCF-277
492 
493 * Added hack to the DAP code to address a problem with the Columbia.edu server. That server does not serve up proper DAP2 DDS replies. The Dataset {...} name changes depending on if the request has certain kinds of constraints. [NCF-276]
494 
495 [NCF-276]:https://bugtracking.unidata.ucar.edu/browse/NCF-276
496 
497 * Fixed bugs with ncdump annotation of values, using -b or -f
498  options. [NCF-275]
499 
500 [NCF-275]:https://bugtracking.unidata.ucar.edu/browse/NCF-275
501 
502 
503 ### 4.3.1-rc4 Released 2013-11-06
504 
505 * Addressed an issue on Windows where `fstat` would report an incorrect file size on files > 4GB. [NCF-219]
506 
507 
508 * Added better documentation about accessing ESG datasets.
509  See http://www.unidata.ucar.edu/software/netcdf/docs/esg.html.
510 
511 * Corrected an issue with CMake-based builds enabling HDF4 support where the HDF4 libraries were in a non-standard location.
512 
513 * Fix bug introduced by [NCF-267] where octal constants above
514 '\177' were not recognized as proper octal constants. [NCF-271]
515 
516 [NCF-271]:https://bugtracking.unidata.ucar.edu/browse/NCF-271
517 
518 * Fixed an issue where the `netcdf.3` man page was not being installed by CMake-based builds. [Github](https://github.com/Unidata/netcdf-c/issues/3)
519 
520 
521 
522 ### 4.3.1-rc3 Released 2013-09-24
523 
524 * Modify ncgen to support NUL characters in character array
525  constants. [NCF-267]
526 
527 [NCF-267]:https://bugtracking.unidata.ucar.edu/browse/NCF-267
528 
529 * Modify ncgen to support disambiguating references to
530  an enum constant in a data list. [NCF-265]
531 
532 [NCF-265]:https://bugtracking.unidata.ucar.edu/browse/NCF-265
533 
534 * Corrected bug in netCDF-4 dimension ID ordering assumptions, resulting in access that works locally but fails through DAP server. [NCF-166]
535 
536 [NCF-166]:https://bugtracking.unidata.ucar.edu/browse/NCF-166
537 
538 * Added a new configuration flag, `NC_USE_STATIC_CRT` for CMake-based Windows builds. The default value is 'OFF'. This will allow the user to define whether to use the shared CRT libraries (\\MD) or static CRT libraries (\\MT) in Visual Studio builds.
539 
540 * Ensure netCDF-4 compiles with OpenMPI as an alternative to MPICH2. [NCF-160]
541 
542 [NCF-160]:https://bugtracking.unidata.ucar.edu/browse/NCF-160
543 
544 * Addressed issue with hanging Parallel netCDF-4 using HDF5 1.8.10. [NCF-240]
545 
546 [NCF-240]:https://bugtracking.unidata.ucar.edu/browse/NCF-240
547 
548 * Addressed issue with Large File Support on Windows, using both 32 and 64-bit builds. [NCF-219]
549 
550 [NCF-219]:https://bugtracking.unidata.ucar.edu/browse/NCF-219
551 
552 * Removed deprecated directories:
553  * librpc/
554  * udunits/
555  * libcf/
556  * libcdmr/
557 
558 ### 4.3.1-rc2 Released 2013-08-19
559 
560 * Added `configure` and accompanying configuration files/templates to release repository. **These will only be added to tagged releases on GitHub**.
561 
562 * Integrated a fix by Quincey Koziol which addressed a variation of [NCF-250], *Fix issue of netCDF-4 parallel independent access with unlimited dimension hanging*.
563 
564 [NCF-250]:https://bugtracking.unidata.ucar.edu/browse/NCF-250
565 
566 * Integrated change contributed by Orion Poplawski which integrated GNUInstallDirs into the netCDF-C CMake system; this will permit systems that install into lib64 (such as Fedora) to `make install` without problem.
567 
568 * Corrected an error with the CMake config files that resulted in the `netcdf.3` manpage not being built or installed.
569 
570 ### 4.3.1-rc1 Released 2013-08-09
571 
572 * Migrated from the netCDF-C `subversion` repository to a publicly available GitHub repository available at https://github.com/Unidata/netCDF-C. This repository may be checked out (cloned) with the following command:
573 
574  $ git clone https://github.com/Unidata/netCDF-C.git
575 
576 * Note: in this release, it is necessary to generate the `configure` script and makefile templates using `autoreconf` in the root netCDF-C directory.:
577 
578  $ autoreconf -i -f
579 
580 * Added `nc_rename_grp` to allow for group renaming in netCDF-4 files. [NCF-204]
581 
582 [NCF-204]: https://bugtracking.unidata.ucar.edu/browse/NCF-204
583 
584 * Added a `NC_HAVE_RENAME_GRP` macro to netcdf.h, [as per a request by Charlie Zender][cz1]. This will allow software compiling against netcdf to easily query whether or not nc\_rename\_grp() is available.
585 
586 [cz1]: https://bugtracking.unidata.ucar.edu/browse/NCF-204
587 
588 * Added Greg Sjaardema's contributed optimization for the nc4\_find\_dim\_len function in libsrc4/nc4internal.c. The patch eliminates several malloc/free calls that exist in the original coding.
589 
590 * Added support for dynamic loading, to compliment the dynamic loading support introduced in hdf 1.8.11. Dynamic loading support depends on libdl, and is enabled as follows: [NCF-258]
591  * autotools-based builds: --enable-dynamic-loading
592  * cmake-based builds: -DENABLE\_DYNAMIC\_LOADING=ON
593 
594 [NCF-258]: https://bugtracking.unidata.ucar.edu/browse/NCF-258
595 
596 * Fix issue of netCDF-4 parallel independent access with unlimited dimension hanging. Extending the size of an unlimited dimension in HDF5 must be a collective operation, so now an error is returned if trying to extend in independent access mode. [NCF-250]
597 
598 [NCF-250]: https://bugtracking.unidata.ucar.edu/browse/NCF-250
599 
600 * Fixed bug with netCDF-4's inability to read HDF5 scalar numeric attributes. Also allow, in addition to zero length strings, a new NULL pointer as a string value. to improve interoperability with HDF5. This required a new CDL constant, 'NIL', that can be output from ncdump for such a string value in an HDF5 or netCDF-4 file. The ncgen utility was also modified to properly handle such NIL values for strings. [NCF-56]
601 
602 [NCF-56]: https://bugtracking.unidata.ucar.edu/browse/NCF-56
603 
604 * Parallel-build portability fixes, particularly for OpenMPI and gcc/gfortran-4.8.x on OSX.
605 
606 * Fix contributed by Nath Gopalaswamy to large file problem reading netCDF classic or 64-bit offset files that have a UINT32_MAX flag for large last record size of a variable that has values larger than 1 byte. This problem had previously been fixed for *writing* such data, but was only tested with an ncbyte variable.
607 
608 * Fixed various minor documentation problems.
609 
610 ## 4.3.0 Released 2013-04-29
611 
612 * fsync: Changed default in autotools config file; fsync must now be
613 explicitly enabled instead of explicitly disabled. [NCF-239]
614 
615 [NCF-239]: https://bugtracking.unidata.ucar.edu/browse/NCF-239
616 
617 * Fixed netCDF-4 bug where odometer code for libdap2 mishandled stride > 1. Bug reported by Ansley Manke. [NCF-249]
618 
619 [NCF-249]: https://bugtracking.unidata.ucar.edu/browse/NCF-249
620 
621 * Fixed netCDF-4 bug so netCDF just ignores objects of HDF5 reference type in
622 the file, instead of rejecting the file. [NCF-29]
623 
624 [NCF-29]: https://bugtracking.unidata.ucar.edu/browse/NCF-29
625 
626 * Fixed netCDF-4 bug with particular order of creation of dimensions,
627 coordinate variables, and subgroups resulting in two dimensions with the
628 same dimension ID. [NCF-244]
629 
630 [NCF-244]: https://bugtracking.unidata.ucar.edu/browse/NCF-244
631 
632 * Fixed netCDF-4 bug with a multidimensional coordinate variable in a
633 subgroup getting the wrong dimension IDs for its dimensions. [NCF-247]
634 
635 [NCF-247]: https://bugtracking.unidata.ucar.edu/browse/NCF-247
636 
637 * Fixed bug with incorrect fixed-size variable offsets in header getting
638 written when schema changed for files created by PnetCDF Thanks
639 to Wei-keng Liao for developing and contributing the fix. [NCF-234]
640 
641 [NCF-234]: https://bugtracking.unidata.ucar.edu/browse/NCF-234
642 
643 * Fixed bug in handling old servers that do not do proper Grid to
644 Structure conversions. [NCF-232]
645 
646 [NCF-232]: https://bugtracking.unidata.ucar.edu/browse/NCF-232
647 
648 * Replaced the oc library with oc2.0
649 
650 * Fix bug with nc\_get\_var1\_uint() not accepting unsigned ints larger
651 than 2\*\*31. [NCF-226]
652 
653 [NCF-226]: https://bugtracking.unidata.ucar.edu/browse/NCF-226
654 
655 * Fix to convert occurrences of '/' in DAP names to %2f. [NCF-223]
656 
657 [NCF-223]: https://bugtracking.unidata.ucar.edu/browse/NCF-223
658 
659 * Fix bug in netCDF-4 with scalar non-coordinate variables with same name
660 as dimensions. [NCF-222]
661 
662 [NCF-222]: https://bugtracking.unidata.ucar.edu/browse/NCF-222
663 
664 * Fix bug in which calling netCDF-4 functions in which behavior that
665 should not depend on order of calls sometimes produces the wrong
666 results. [NCF-217]
667 
668 [NCF-217]: https://bugtracking.unidata.ucar.edu/browse/NCF-217
669 
670 * Merged in nccopy additions from Martin van Driel to support -g and -v
671 options for specifying which groups or variables are to be copied.
672 [NCF-216]
673 
674 [NCF-216]: https://bugtracking.unidata.ucar.edu/browse/NCF-216
675 
676 * Merged in PnetCDF bugs fixes from Greg Sjaardema. [NCF-214]
677 
678 [NCF-214]: https://bugtracking.unidata.ucar.edu/browse/NCF-214
679 
680 * Modify ncgen so that if the incoming file has a special attribute, then
681 it is used to establish the special property of the netcdf file, but the
682 attribute is not included as a real attribute in the file. [NCF-213].
683 
684 [NCF-213]: https://bugtracking.unidata.ucar.edu/browse/NCF-213
685 
686 * Added library version info to the user-agent string so that the server
687 logs will be more informative. [NCF-210]
688 
689 [NCF-210]: https://bugtracking.unidata.ucar.edu/browse/NCF-210
690 
691 * Added work around for bad servers that sometimes sends DAP dataset with
692 duplicate field names. [NCF-208]
693 
694 [NCF-208]: https://bugtracking.unidata.ucar.edu/browse/NCF-208
695 
696 * Fixed bug with strided access for NC\_STRING type. [NCF-206]
697 
698 [NCF-206]: https://bugtracking.unidata.ucar.edu/browse/NCF-206
699 
700 * Prevented adding an invalid \_FillValue attribute to a variable (with
701 nonmatching type or multiple values), to avoid later error when any
702 record variable is extended. [NCF-190]
703 
704 [NCF-190]: https://bugtracking.unidata.ucar.edu/browse/NCF-190
705 
706 * Fix bug in which some uses of vlen within compounds causes HDF5 errors.
707 [NCF-155]
708 
709 [NCF-155]: https://bugtracking.unidata.ucar.edu/browse/NCF-155
710 
711 * Fixed ncdump bug in display of data values of variables that use
712 multiple unlimited dimensions. [NCF-144]
713 
714 [NCF-144]: https://bugtracking.unidata.ucar.edu/browse/NCF-144
715 
716 * Fix bug in which interspersing def\_var calls with put\_var calls can
717 lead to corrupt metadata in a netCDF file with groups and inherited
718 dimensions. [NCF-134]
719 
720 [NCF-134]: https://bugtracking.unidata.ucar.edu/browse/NCF-134
721 
722 * Building shared libraries works with DAP and netCDF4 functionality.
723 [NCF-205] [NCF-57]
724 
725 [NCF-205]: https://bugtracking.unidata.ucar.edu/browse/NCF-205
726 [NCF-57]: https://bugtracking.unidata.ucar.edu/browse/NCF-57
727 
728 * 32-and-64-bit builds are working under MinGW on Windows. [NCF-112]
729 
730 [NCF-112]: https://bugtracking.unidata.ucar.edu/browse/NCF-112
731 
732 * Config.h for Windows compiles are included in the build. [NCF-98]
733 
734 [NCF-98]: https://bugtracking.unidata.ucar.edu/browse/NCF-98
735 
736 * NetCDF-4 dependency on NC\_MAX\_DIMS has been removed. [NCF-71]
737 
738 [NCF-71]: https://bugtracking.unidata.ucar.edu/browse/NCF-71
739 
740 * 64-bit DLL's are produced on Windows. [NCF-65]
741 
742 [NCF-65]: https://bugtracking.unidata.ucar.edu/browse/NCF-65
743 
744 * DLL Packaging issues are resolved. [NCF-54]
745 
746 [NCF-54]: https://bugtracking.unidata.ucar.edu/browse/NCF-54
747 
748 * The CMake build system (with related ctest and cdash systems for
749 testing) has been integrated into netCDF-C. This allows for Visual
750 Studio-based builds in addition to gcc-based builds. This requires at
751 least CMake version 2.8.8. This replaces/supplements the cross-compiled
752 set of Visual-Studio compatible netCDF libraries introduced in netCDF
753 4.2.1-rc1.
754 
755 ## 4.2.1.1 Released 2012-08-03
756 
757 * Patched libdap2/ncdap3.c to fix DAP performance bug remotely accessing large files (> 2GiB).
758 
759 * Patched ncdump/dumplib.c to properly escape special characters in CDL output from ncdump for netCDF-4 string data.
760 
761 
762 ### 4.2.1 Released 2012-07-18
763 
764 * Added a specific NC\_MMAP mode flag to modify behavior of NC\_DISKLESS.
765 
766 * Changed the file protections for NC\_DISKLESS created files to 0666
767 [NCF-182]
768 
769 * Fixed ncdump to report error when an unsupported option is specified.
770 [NCF-180]
771 
772 * Fixed documentation of CDL char constants in Users Guide and ncgen man
773 page.
774 
775 * Fixed memory leak detected by valgrind in one of the HDF5 tests.
776 
777 * Fixed problem with \#elif directives in posixio.c revealed by PGI
778 compilers.
779 
780 ### 4.2.1-rc1 Released 2012-06-18
781 
782 * Ported static and shared libraries (DLL's) for both 32- and 64-bit
783 Windows, including support for DAP remote access, with netCDF-3 and
784 netCDF-4/HDF5 support enabled. The environment for this build is
785 MSYS/MinGW/MinGW64, but the resulting DLLs may be used with Visual
786 Studio. [NCF-112] [NCF-54] [NCF-57] [NCF-65]
787 
788 * Implemented diskless files for all netCDF formats. For nc\_create(),
789 diskless operation performs all operations in memory and then optionally
790 persists the results to a file on close. For nc\_open(), but only for
791 netcdf classic files, diskless operation caches the file in-memory,
792 performs all operations on the memory resident version and then writes
793 all changes back to the original file on close.
794 [NCF-110][NCF-109][NCF-5]
795 
796 * Added MMAP support. If diskless file support is enabled, then it is
797 possible to enable implementation of diskless files using the operating
798 system's MMAP facility (if available). The enabling flag is
799 "--enable-mmap". This is most useful when using nc\_open() and when only
800 parts of files, a single variable say, need to be read.
801 
802 * Added configure flag for --disable-diskless.
803 
804 * Added nccopy command-line options to exploit diskless files, resulting
805 in large speedups for some operations, for example converting unlimited
806 dimension to fixed size or rechunking files for faster access. Upgraded
807 doxygen and man-page documentation for ncdump and nccopy utilities,
808 including new -w option for diskless nccopy, with an example.
809 
810 * Modified Makefile to allow for concurrent builds and to support builds
811 outside the source tree, e.g. 'mkdir build; cd build;
812 SOURCE-DIR/configure' where SOURCE-DIR is the top-level source
813 directory.
814 
815 * Fixed some netCDF-4 bugs with handling strings in non-netCDF-4 HDF5
816 files. [NCF-150]
817 
818 * Fixed bug using nccopy to compress with shuffling that doesn't compress
819 output variables unless they were already compressed in the input file.
820 [NCF-162]
821 
822 * Fixed bug in 64-bit offset files with large records, when last record
823 variable requires more than 2\*\*32 bytes per record. [NCF-164]
824 
825 * Fix bug in which passing a NULL path to nc\_open causes failure.
826 [NCF-173]
827 
828 * Fixed ncgen bugs in parsing and handling opaque data.
829 
830 * Fixed ncdump bug, not escaping characters special to CDL in enumeration
831 labels. [NCF-169]
832 
833 * Fixed bug reading netCDF int into a C longlong or writing from longlong
834 to external int on 32-bit platforms with classic format files. The upper
835 32 bits of the longlong were not cleared on read or used on write.
836 [NCF-171]
837 
838 * Resolved some erroneous returns of BADTYPE errors and RANGE errors due
839 to conflating C memory types with external netCDF types when accessing
840 classic or 64-bit offset files. [NCF-172]
841 
842 * Fixed bug with ncdump -t interpreting unit attribute without base time
843 as a time unit. [NCF-175]
844 
845 * Changed port for testing remote access test server to increase
846 reliability of tests.
847 
848 * Modified ncio mechanism to support multiple ncio packages, so that it is
849 possible to have e.g. posixio and memio operating at the same time.
850 
851 * Generation of documentation is disabled by default. Use --enable-doxygen
852 to generate. [NCF-168]
853 
854 * Added description of configure flags to installation guide.
855 
856 * Clarified documentation of arguments to nc**open() and nc**create() and
857 their default values.
858 
859 * Fixed doxygen installation guide source file to preserve line breaks in
860 code and scripts. [NCF-174]
861 
862 * Cleaned up a bunch of lint issues (unused variables, etc.) and some
863 similar problems reported by clang static analysis.
864 
865 * Updated and fixed pkg-config source file netcdf.pc.in to work with
866 separated netCDF language-specific packages. Also fixed nc-config to
867 call nf-config, ncxx-config, and ncxx4-config for for backward
868 compatibility with use of nc-config in current Makefiles. [NCF-165]
869 [NCF-179]
870 
871 ## 4.2.0 2012-05-01
872 
873 * Completely rebuilt the DAP constraint handling. This primarily affects
874 users who specify a DAP constraint as part of their URL. [NCF-120]
875 
876 * Fixed cause of slow nccopy performance on file systems with many records
877 and large disk block size or many record variables, by accessing data a
878 record at a time instead of a variable at a time. [NCF-142]
879 
880 * Performance improvement to DAP code to support fetching partial
881 variables into the cache; especially important when using nc\_get\_var()
882 API. A partial variable is one that has ranges attached to the
883 projection variables (e.g. x[1:10][20:21]) [NCF-157]
884 
885 * Separate the Fortran and C++ libraries and release the C library and
886 ncdump/ncgen/nccopy without Fortran or C++. [NCF-24]
887 
888 * Documentation mostly migrated to Doxygen, from Texinfo. [NCF-26]
889 
890 * Properly convert vara start/count parameters to DAP [NCF-105][NCF-106]
891 
892 * Fixed major wasted space from previous default variable chunk sizes
893 algorithm. [NCF-81]
894 
895 * Fixed bug in nccopy, in which compression and chunking options were
896 ignored for netCDF-4 input files. [NCF-79]
897 
898 * Fixed bug in ncgen in which large variables (more than 2**18 elements)
899 duplicates the first 2**18 values into subsequent chunks of data
900 [NCF-154].
901 
902 * Applied Greg Sjaardema's nccopy bug fix, not compressing output
903 variables f they were not already using compression on the input file
904 when shuffle specified. [NCF-162]
905 
906 * Fixed problem when a URL is provided that contains only a host name.
907 [NCF-103]
908 
909 * Fixed behavior of ncgen flags so that -o => -lb and, in the absence of
910 any other markers, make the default be -k1 [NCF-158]
911 
912 * Created a text INSTALL file for netCDF-4.2 release. [NCF-161]
913 
914 * Fixed bug in ncgen for vlen arrays as fields of compound types where
915 datalists for those types was improperly interpreted [NCF-145] (but see
916 NCF-155).
917 
918 * Improve use of chunk cache in nccopy utility, making it practical for
919 rechunking large files. [NCF-85]
920 
921 * Fixed nccopy bug copying a netCDF-4 file with a chunksize for an
922 unlimited dimension that is larger than the associated dimension size.
923 [NCF-139]
924 
925 * Fixed nccopy bug when rechunking a netCDF-4 file with a chunkspec option
926 that doesn't explicitly specify all dimensions. [NCF-140]
927 
928 * Fixed bug in netCDF-4 files with non-coordinate variable with the same
929 name as a dimension. [NCF-141]
930 
931 * Incorporated Wei Huang's fix for bug where netCDF-4 sometimes skips over
932 too many values before adding fill values to an in-memory buffer.
933 [NCF-143]
934 
935 * Fixed ncgen bug with netCDF-4 variable-length constants (H/T to Lynton
936 Appel). [NCF-145]
937 
938 * Incorporated Peter Cao's performance fixes using HDF5 link iterator for
939 any group with many variables or types. [NCF-148]
940 
941 * Incorporated Constantine Khroulev's bug fix for invalid usage of
942 MPI\_Comm\_f2c in nc\_create\_par. [NCF-135]
943 
944 * Fixed turning off fill values in HDF5 layers when NOFILL mode is set in
945 netCDF-4 API (thanks to Karen Schuchardt). [NCF-151]
946 
947 * Fixed bug with scalar coordinate variables in netCDF-4 files, causing
948 failure with --enable-extra-tests [NCF-149]
949 
950 * Cleaned up the definition and use of nulldup. [NCF-92][NCF-93][NCF-94]
951 
952 * Fixed various '\#include' bugs. [NCF-91][NCF-96][NCF-127]
953 
954 * v2 API functions modified to properly call the external API instead of
955 directly calling the netcdf-3 functions. [NCF-100]
956 
957 * Fixed problem with 64-bit offset format where writing more than 2\*\*31
958 records resulted in erroneous NC\_EINVALCOORDS error. [NCF-101]
959 
960 * Restored original functionality of ncgen so that a call with no flags,
961 only does the syntax check. [NCF-104]
962 
963 * Corrected misc. test bugs [NCF-107]
964 
965 * Modified ncdump to properly output various new types (ubyte, ushort,
966 uint, int64, and uint64). [NCF-111]
967 
968 * Fixed incorrect link flag for szip in configure.ac [NCF-116]
969 
970 * ncdump -t now properly parses ISO "T" separator in date-time strings.
971 [NCF-16]
972 
973 * ncdump -t "human time" functionality now available for attributes and
974 bounds variables [NCF-70]
975 
976 * In ncdump, add -g option to support selection of groups for which data
977 is displayed. [NCF-11]
978 
979 * Now supports bluefire platform [NCF-52]
980 
981 * ncdump now properly displays values of attributes of type NC\_USHORT as
982 signed shorts [NCF-82]
983 
984 * Rename some code files so that there are no duplicate filenames.
985 [NCF-99]
986 
987 * Demonstration of netCDF-4 Performance Improvement with KNMI Data
988 [NCF-113]
989 
990 * Dimension size in classic model netCDF-4 files now allows larger sizes
991 than allowed for 64-bit offset classic files. [NCF-117]
992 
993 * ncdump now reports correct error message when "-x" option specifying
994 NcML output is used on netCDF-4 enhanced model input. [NCF-129]
995 
996 * Fixed bug causing infinite loop in ncdump -c of netCDF-4 file with
997 subgroup with variables using inherited dimensions. [NCF-136]
998 
999 ## 4.1.3 2011-06-17
1000 
1001 * Replace use of --with-hdf5= and other such configure options that
1002 violate conventions and causes build problems. Set environment variables
1003 CPPFLAGS, LDFLAGS, and LD\_LIBRARY\_PATH instead, before running
1004 configure script. [NCF-20]
1005 
1006 * Detect from configure script when szlib is needed [NCF-21]
1007 
1008 * Fix bug that can silently zero out portions of a file when writing data
1009 in nofill mode beyond the end of a file, crossing disk-block boundaries
1010 with region to be written while in-memory buffer is in a specific state.
1011 This bug was observed disabling fill mode using Lustre (or other large
1012 blksize file system) and writing data slices in reverse order on disk.
1013 [NCF-22]
1014 
1015 * Fix bug that prevents netCDF-4/HDF5 files created with netCDF-4.1.2 from
1016 being read by earlier versions of netCDF or HDF5 versions before 1.8.7.
1017 [NCF-23]
1018 
1019 * Fix bug in configure that did not make the search for the xdr library
1020 depend on --enable-dap. [NCF-41]
1021 
1022 * Fix ncgen bug that did not use the value of a \_Format attribute in the
1023 input CDL file to determine the kind of output file created, when not
1024 specified by the -k command-line flag. [NCF-42]
1025 
1026 * Fix ncgen bug, not properly handling unsigned longlong parsing. [NCF-43]
1027 
1028 * Fix DAP client code to suppress variables with names such as "x.y",
1029 which DAP protocol interprets as variable "y" inside container "x". Such
1030 variables will be invisible when accessed through DAP client. [NCF-47]
1031 
1032 * Define uint type for unsigned integer, if not otherwise available.
1033 Symptom was compile error involving uint in putget.c. [NCF-49]
1034 
1035 * Fix username+password handling in the DAP client code. [NCF-50]
1036 
1037 * Add test for handling parallel I/O problem from f77 when user forgets to
1038 turn on one of the two MPI flags. [NCF-60]
1039 
1040 * Resolved "make check" problems when ifort compiler. Some "make install"
1041 problems remain when using MPI and shared libraries. [NCF-61]
1042 
1043 * Fix problem with f90\_def\_var not always handle deflate setting when
1044 compiler was ifort. [NCF-67]
1045 
1046 * Check that either MPIIO or MPIPOSIX flag is set when parallel create or
1047 open is called. Also fix examples that didn't set at least one of these
1048 flags. [NCF-68]
1049 
1050 * Improve documentation on handling client-side certificates [NCF-48]
1051 
1052 * Document that array arguments, except in varm functions, must point to
1053 contiguous blocks of memory. [NCF-69]
1054 
1055 * Get netCDF-4 tests working for DLLs generated with mingw. [NCF-6]
1056 
1057 * Make changes necessary for upgrading to HDF5 1.8.7 [NCF-66]
1058 
1059 ### 4.1.3-rc1 2011-05-06
1060 
1061 * Stop looking for xdr if --disable-dap is used.
1062 
1063 * Don't try to run (some) fortran configure tests on machines with no
1064 fortran.
1065 
1066 * Allow nccopy to rechunk with chunksizes larger than current dimension
1067 lengths.
1068 
1069 * Initial implementation of CDMREMOTE is complete; needs comprehensive
1070 testing.
1071 
1072 ### 4.1.3-beta1 2011-04-29
1073 
1074 * Fixed szlib not linking bug.
1075 
1076 * Fixed dreaded "nofill bug", lurking in netCDF classic since at least
1077 1999. Writing more than a disk block's worth of data that crossed disk
1078 block boundaries more than a disk block beyond the end of file in nofill
1079 mode could zero out recently written earlier data that hadn't yet been
1080 flushed to disk.
1081 
1082 * Changed setting for H5Pset\_libver\_bounds to ensure that all netCDF-4
1083 files can be read by HDF5 1.8.x.
1084 
1085 * Merged libncdap3 and libncdap4 into new libdap2 library. The suffix dap2
1086 now refers to the dap protocol. This is in prep for adding dap4 protocol
1087 support.
1088 
1089 * Took out --with-hdf5 and related options due to high cost of maintaining
1090 this non-standard way of finding libraries.
1091 
1092 ## 4.1.2 2011-03-29
1093 
1094 * Changes in build system to support building dlls on cygwin/mingw32.
1095 
1096 * Changes to fix portability problems and get things running on all test
1097 platforms.
1098 
1099 * Some minor documentation fixes.
1100 
1101 * Fixed opendap performance bug for nc\_get\_vars; required adding
1102 nc\_get\_var{s,m} to the dispatch table.
1103 
1104 * Now check for libz in configure.ac.
1105 
1106 * Fixed some bugs and some performance problems with default chunksizes.
1107 
1108 ### 4.1.2-beta2 2011-01-11
1109 
1110 * Add "-c" option to nccopy to specify chunk sizes used in output in terms
1111 of list of dimension names.
1112 
1113 * Rewrite netCDF-4 attribute put code for a large speedup when writing
1114 lots of attributes.
1115 
1116 * Fix nc-config --libs when static dependent libraries are not installed
1117 in the same directory as netCDF libraries (thanks to Jeff Whitaker).
1118 
1119 * Build shared libraries by default, requiring separate Fortran library.
1120 Static libraries now built only with --disable-shared.
1121 
1122 * Refactor of HDF5 file metadata scan for large speedup in opening files,
1123 especially large files.
1124 
1125 * Complete rewrite of the handling of character datalist constants. The
1126 heuristics are documented in ncgen.1.
1127 
1128 * Eliminate use of NC\_MAX\_DIMS and NC\_MAX\_VARS in ncdump and nccopy,
1129 allocating memory as needed and reducing their memory footprint.
1130 
1131 * Add documentation for new nc\_inq\_path() function.
1132 
1133 * Use hashing to speedup lookups by name for files with lots of dimensions
1134 and variables (thanks to Greg Sjaardema).
1135 
1136 * Add options to nccopy to support uniform compression of variables in
1137 output, shuffling, and fixing unlimited dimensions. Documented in
1138 nccopy.1 man page and User's Guide.
1139 
1140 ### 4.1.2-beta1 2010-07-09
1141 
1142 * Fix "ncdump -c" bug identifying coordinate variables in groups.
1143 
1144 * Fix bug in libsrc/posixio.c when providing sizehint larger than default,
1145 which then doesn't get used (thanks to Harald Anlauf).
1146 
1147 * Fix netCDF-4 bug caused when doing enddef/redef and then defining
1148 coordinate variable out of order.
1149 
1150 * Fixed bug in man4 directory automake file which caused documentation to
1151 be rebuilt after make clean.
1152 
1153 * Turned off HDF5 caching when parallel I/O is in use because of its
1154 memory use.
1155 
1156 * Refactoring of netCDF code with dispatch layer to decide whether to call
1157 netCDF classic, netCDF-4, or opendap version of a function.
1158 
1159 * Refactoring of netCDF-4 memory internals to reduce memory use and end
1160 dependence on NC\_MAX\_DIMS and NC\_MAX\_NAME.
1161 
1162 * Modified constraint parser to be more compatible with a java version of
1163 the parser.
1164 
1165 * Modified ncgen to utilize iterators internally; should be no user
1166 visible effect.
1167 
1168 * Fixed two large-file bugs with using classic format or 64-bit offset
1169 format and accessing multidimensional variables with more than 2\*\*32
1170 values.
1171 
1172 ## 4.1.1 2010-04-01
1173 
1174 * Fixed various build issues.
1175 
1176 * Fixed various memory bugs.
1177 
1178 * Fixed bug for netCDF-4 files with dimensions and coord vars written in
1179 different orders, with data writes interspersed.
1180 
1181 * Added test for HDF5-1.8.4 bug.
1182 
1183 * Added new C++ API from Lynton Appel.
1184 
1185 ## 4.1 2010-01-30
1186 
1187 * Much better memory leak checking with valgrind.
1188 
1189 * Added per-variable chunk cache control for better performance. Use
1190 nc\_set\_var\_chunk\_cache / nf\_set\_var\_chunk\_cache /
1191 nf90\_set\_var\_chunk\_cache to set the per-variable cache.
1192 
1193 * Automatically set per-variable chunk cache when opening a file, or
1194 creating a variable, so that the cache is big enough for more than one
1195 chunk. (Can be overridden by user). Settings may be changed with
1196 configure options --max-default-chunk-size and
1197 --default-chunks-in-cache.
1198 
1199 * Better default chunks size. Now chunks are sized to fit inside the
1200 DEFAULT\_CHUNK\_SIZE (settable at configure time with
1201 --with-default-chunk-size= option.)
1202 
1203 * Added nccopy utility for converting among netCDF format variants or to
1204 copy data from DAP servers to netCDF files.
1205 
1206 * The oc library has been modified to allow the occurrence of alias
1207 definitions in the DAS, but they will be ignored.
1208 
1209 * The old ncgen has been moved to ncgen3 and ncgen is now the new ncgen4.
1210 
1211 * Modified --enable-remote-tests to be on by default.
1212 
1213 * Fixed the nc\_get\_varm code as applied to DAP data sources.
1214 
1215 * Added tests for nc-config.
1216 
1217 * Many documentation fixes.
1218 
1219 * Added capability to use the PnetCDF library to
1220 perform parallel I/O on classic and 32-bit offset files. Use the
1221 NC\_PNETCDF mode flag to get parallel I/O for non-netcdf-4 files.
1222 
1223 * Added libcf library to netCDF distribution. Turn it on with configure
1224 option --with-libcf.
1225 
1226 * Added capability to read HDF4 files created with the SD (Scientific
1227 Data) API.
1228 
1229 * The DAP support was revised to closely mimic the original libnc-dap
1230 support.
1231 
1232 * Significantly revised the data handling mechanism in ncgen4 to more
1233 closely mimic the output from the original ncgen.
1234 
1235 * Added prototype NcML output capability to ncgen4. It is specified by the
1236 -lcml flag.
1237 
1238 * Added capability to read HDF5 files without dimension scales. This will
1239 allow most existing HDF5 datasets to be read by netCDF-4.
1240 
1241 * Fixed bug with endianness of default fill values for integer types when
1242 variables are created with a non-native endiannesss and use the default
1243 fill value.
1244 
1245 * Significant refactoring of HDF5 type handling to improve performance and
1246 handle complicated nesting of types in cross-platform cases.
1247 
1248 * Added UDUNITS2 to the distribution. Use --with-udunits to build udunits
1249 along with netcdf.
1250 
1251 * Made changes suggested by HDF5 team to relax creation-order requirement
1252 (for read-only cases) which allows HDF5 1.6.x files to be retrofitted
1253 with dimension scales, and be readable to netCDF-4.
1254 
1255 * Handle duplicate type names within different groups in ncdump. Fix group
1256 path handling in absolute and relative variable names for "-v" option.
1257 
1258 * Added nc-config shell script to help users build netCDF programs without
1259 having to figure out all the compiler options they will need.
1260 
1261 * Fixed ncdump -s bug with displaying special attributes for classic and
1262 64-bit offset files.
1263 
1264 * For writers, nc\_sync() now calls fsync() to flush data to disk sooner.
1265 
1266 * The nc\_inq\_type() function now works for primitive types.
1267 
1268 ## 4.0.1 2009-03-26
1269 
1270 * Added optional arguments to F90 API to nf90\_open/create,
1271 nf90\_create\_var, and nf90\_inquire\_variable so that all netCDF-4
1272 settings may be accomplished with optional arguments, instead of
1273 separate function calls.
1274 
1275 * Added control of HDF5 chunk cache to allow for user performance tuning.
1276 
1277 * Added parallel example program in F90.
1278 
1279 * Changed default chunking to better handle very large variables.
1280 
1281 * Made contiguous the default for fixed size data sets with no filters.
1282 
1283 * Fixed bug in nc\_inq\_ncid; now it returns NC\_ENOGRP if the named group
1284 is not found.
1285 
1286 * Fixed man pages for C and F77 so that netCDF-4 builds will result in man
1287 pages that document new netCDF-4 functions.
1288 
1289 * Added OPeNDAP support based on a new C-only implementation. This is
1290 enabled using --enable-dap option and requires libcurl. The configure
1291 script will attempt to locate libcurl, but if it fails, then its
1292 location must be specified by the --with-curl option.
1293 
1294 ### 4.0.1-beta2 2008-12-26
1295 
1296 * Changed chunksizes to size\_t from int.
1297 
1298 * Fixed fill value problem from F77 API.
1299 
1300 * Fixed problems in netcdf-4 files with multi-dimensional coordinate
1301 variables.
1302 
1303 * Fixed ncgen to properly handle CDL input that uses Windows line endings
1304 ("\r\n"), instead of getting a syntax error.
1305 
1306 * Added "-s" option to ncdump to display performance characterisitics of
1307 netCDF-4 files as special virtual attributes, such as \_Chunking,
1308 \_DeflateLevel, \_Format, and \_Endianness.
1309 
1310 * Added "-t" option to ncdump to display times in human readable form as
1311 strings. Added code to interpret "calendar" attribute according to CF
1312 conventions, if present, in displaying human-readable times.
1313 
1314 * Added experimental version of ncgen4 capable of generating netcdf-4 data
1315 files and C code for creating them. In addition, it supports the special
1316 attributes \_Format, etc.
1317 
1318 * 4.0.1-beta1 2008-10-16
1319 
1320 * Fixed Fortran 90 int64 problems.
1321 
1322 * Rewrote HDF5 read/write code in accordance with performance advice from
1323 Kent.
1324 
1325 * Fixed memory leaks in gets/puts of HDF5 data.
1326 
1327 * Fixed some broken tests for parallel I/O (i.e. MPI) builds.
1328 
1329 * Fixed some cross-compile problems.
1330 
1331 * Rewrote code which placed bogus errors on the HDF5 error stack, trying
1332 to open non-existent attributes and variables. Now no HDF5 errors are
1333 seen.
1334 
1335 * Removed man subdirectory. Now man4 subdirectory is used for all builds.
1336 
1337 * Changed build so that users with access to parallel make can use it.
1338 
1339 * Added experimental support for accessing data through OPeNDAP servers
1340 using the DAP protocol (use --enable-opendap to build it).
1341 
1342 * Fixed ncdump bugs with array field members of compound type variables.
1343 Fixed ncdump bug of assuming default fill value for data of type
1344 unsigned byte.
1345 
1346 ## 4.0 2008-05-31
1347 
1348 * Introduced the use of HDF5 as a storage layer, which allows use of
1349 groups, user-defined types, multiple unlimited dimensions, compression,
1350 data chunking, parallel I/O, and other features. See the netCDF Users
1351 Guide for more information.
1352 
1353 ## 3.6.3 2008-05-31
1354 
1355 * In ncdump and ncgen, added CDL support for UTF-8 encoding of characters
1356 in names and for escaped special chars in names. Made sure UTF-8 names
1357 are normalized using NFC rules before storing or comparing.
1358 
1359 * Handle IEEE NaNs and infinities in a platform-independent way in ncdump
1360 output.
1361 
1362 * Added support for ARM representation of doubles, (thanks to Warren
1363 Turkal).
1364 
1365 * Fixed bug in C++ API creating 64-bit offset files. (See
1366 http://www.unidata.ucar.edu/software/netcdf/docs/known_problems.html#cxx_64-bit).
1367 
1368 * Fixed bug for variables larger than 4 GB. (See
1369 http://www.unidata.ucar.edu/software/netcdf/docs/known_problems.html#large_vars_362).
1370 
1371 * Changed the configure.ac to build either 3.6.x or 4.x build from the
1372 same configure.ac.
1373 
1374 * Build now checks gfortran version and handles it cleanly, also Portland
1375 Group in Intel fortran, with various configurations.
1376 
1377 * A Fortran netcdf.inc file is now created at build time, based on the
1378 setting of --disable-v2.
1379 
1380 * Documentation has been fixed in several places.
1381 
1382 * Upgraded to automake 1.10, autoconf 2.62, and libtool 2.2.2.
1383 
1384 * Includes missing Windows Visual Studio build files.
1385 
1386 * Fixed missing include of config.h in a C++ test program.
1387 
1388 * Fixed maintainer-clean in man directory.
1389 
1390 * Fixed --enable-c-only and make check.
1391 
1392 * Fixed behavior when opening a zero-length file.
1393 
1394 * Many portability enhancements to build cleanly on various platforms.
1395 
1396 * Turned on some old test programs which were not being used in the build.
1397 
1398 ## 3.6.2 2007-03-05
1399 
1400 * Released.
1401 
1402 ### 3.6.2 beta6 2007-01-20
1403 
1404 * Fine tuning of build system to properly handle cygwin, Mingw, and
1405 strange configuration issues.
1406 
1407 * Automake 1.10 has a problem with running our tests on MinGW, so I'm
1408 switching back to automake 1.9.6 for this release.
1409 
1410 ### 3.6.2 beta5 2006-12-30
1411 
1412 * Now netCDF configuration uses autoconf 2.61, and automake 1.10. (Thanks
1413 to Ralf Wildenhues for the patches, and all the autotools help in
1414 general!)
1415 
1416 * Final major revision of netCDF tutorial before the 3.6.2 release.
1417 
1418 * Now netCDF builds under MinGW, producing a windows DLL with the C and
1419 F77 APIs. Use the --enable-shared --enable-dll --disable-cxx
1420 --disable-f90 flags to configure. (C++ and F90 have never been built as
1421 windows DLLs, but might be in a future release if there is user
1422 interest). This has all been documented in the netCDF Porting and
1423 Installation Guide.
1424 
1425 * Now extreme numbers (i.e. those close to the limits of their type) can
1426 be turned off in nc\_test/nf\_test, with --disable-extreme-numbers. It
1427 is turned off automatically for Solaris i386 systems.
1428 
1429 * Added --enable-c-only option to configure. This causes only the core
1430 netCDF-3 C library to be built. It's the same as --disable-f77
1431 --disable-cxx --disable-v2 --disable-utilities.
1432 
1433 * Added --disable-utilities to turn off building and testing of
1434 ncgen/ncdump.
1435 
1436 * Fix a long-standing bug in nf90\_get\_att\_text() pointed out by Ryo
1437 Furue, to make sure resulting string is blank-padded on return. This is
1438 fixed in the Fortran-90 interface, but is impractical to fix in the
1439 Fortran-77 interface implemented via cfortran.h.
1440 
1441 * Now large file tests are run if --enable-large-file-tests is used in the
1442 configure.
1443 
1444 * For Cray users, the ffio module is used if the --enable-ffio option is
1445 passed to configure.
1446 
1447 * Unrolled loops in byte-swapping code used on little-endian platforms to
1448 reduce loop overhead. This optimization resulted in a 22% speedup for
1449 some applications accessing floats or ints (e.g. NCO utilities ncap and
1450 ncbo) and a smaller speedup for shorts or doubles.
1451 
1452 * Added "-k" option to ncdump and ncgen, for identifying and specifying
1453 the kind of netCDF file, one of "classic", "64-bit-offset", "hdf5", or
1454 "hdf5-nc3". Removed output of kind of netCDF file in CDL comment
1455 produced by ncdump.
1456 
1457 * Fixed bug of ncdump seg-faulting if invoked incorrectly with option like
1458 "-c" or "-h" but no file name.
1459 
1460 ### 3.6.2 beta4 2006-08-15
1461 
1462 * Changed F77/F90 man pages from netcdf.3f and netcdf.3f90 to
1463 netcdf\_f77.3 and netcdf\_f90.3. Also fixed broken install of man pages.
1464 
1465 * Changed configure script so that "-g -O2" is no longer set as CFLAGS,
1466 CXXFLAGS, and FFLAGS by default if a GNU compiler is being used. Now
1467 nothing is set.
1468 
1469 * Changed configure script so that fortran flag is set in config.h.
1470 
1471 * Updated Installation and Porting Guide, C++ Interface Guide, F77 and F90
1472 Interface Guides.
1473 
1474 * Build with static libraries by default.
1475 
1476 * Added configure option --enable-separate-fortran, which causes the
1477 fortran library to be built separately. This is turned on automatically
1478 for shared libraries.
1479 
1480 * Improved clarity of error messages.
1481 
1482 * Changed configuration to get cygwin DLL and mingw DLL builds working,
1483 for the C library only (i.e. no F77, F90, or C++ APIs).
1484 
1485 * Changed type of ncbyte in C++ interface from unsigned char to signed
1486 char, for consistency with C interface. The C++ documentation warned
1487 this change would eventually occur.
1488 
1489 * Changed the C++ interface to use only the netCDF-3 C interface instead
1490 of the older netCDF-2 C interface. This has the added benefit that
1491 on-the-fly numeric conversions are now supported using get methods, for
1492 example you can get data of any type as double. When using --disable-v2
1493 flag to configure, the C++ interface can now be built and installed.
1494 
1495 ### 3.6.2 beta3 2006-05-24
1496 
1497 * Changed to use default prefix of /usr/local instead of package-based
1498 prefix of previous releases of netCDF. Use the --prefix argument to the
1499 configure script to override the default.
1500 
1501 * Made separate fortran library file, instead of appending fortran library
1502 functions to the C library file, if --enable-separate-fortran is used
1503 during configure (it's turned on automatically if --enable-shared is
1504 used). If uses, the fortran API users must link to *both* the C library
1505 and the new fortran library, like this: -lnetcdff -lnetcdf
1506 
1507 * Added netCDF examples in C, C++, F77, F90, and CDL. See the examples
1508 subdirectory.
1509 
1510 * Added the NetCDF Tutorial.
1511 
1512 * Minor fixes to some of the netCDF documentation.
1513 
1514 * Made it possible to build without V2 API using --disable-v2 from
1515 configure.
1516 
1517 * Switched to new build system, with automake and libtool. Now shared
1518 libraries are built (as well as static ones) on platforms which support
1519 it. For more information about shared libraries, see
1520 http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#shared_intro
1521 
1522 * Fixed ncdump crash that happened when no arguments were used.
1523 
1524 * Fixed for building with gfortran 4.1.0.
1525 
1526 * Important fix for machines whose SIZEOF\_SIZE\_T != SIZEOF\_LONG, such
1527 as NEC-SX, thanks to Stephen Leak.
1528 
1529 * Fixed C++ on AIX platform.
1530 
1531 * Fixed 64-bit builds on AIX platform.
1532 
1533 * Removed bad assertion that could be triggered in rare cases when reading
1534 a small file.
1535 
1536 * Added comments in v1hpg.c to clarify purpose of each internal function.
1537 
1538 * Make sure filesize is determined in nc\_close() *after* buffers get
1539 flushed.
1540 
1541 * Fix long-standing problem resulting in files up to 3 bytes longer than
1542 necessary if there is exactly one record variable of type byte, char, or
1543 short and if the number of values per record for that variable is not
1544 divisible by 4 (or 2 in the case of short). Now the filesize determined
1545 from header info by NC\_calcsize should be correct in all cases.
1546 
1547 ## 3.6.1 2006-01-31
1548 
1549 * Updated installation manual for 3.6.1.
1550 
1551 * Changed installation to try to provide correct compiler flags for
1552 compiling in 64-bit mode on Sun, Irix, AIX, and HPUX. (HPUX doesn't work
1553 for me, however). Now run configure with --enable-64bit to get a 64 bit
1554 compile.
1555 
1556 * Fixed long-standing bug that would cause small netCDF files to be padded
1557 on the end with zero bytes to 4096 bytes when they were opened and
1558 changed. Now small files should stay small after you change a value.
1559 
1560 * Fixed bug in assertions in putget.c that would only be noticed if you
1561 change the manifest constant NC\_MAX\_DIMS in netcdf.h to be different
1562 from NC\_MAX\_VAR\_DIMS.
1563 
1564 * Moved test ftest.F from fortran to nf\_test directory, and fixed bug in
1565 ftest.F which caused it to return 0 even if tests failed (no tests were
1566 failing, however). Also renamed some test output files to make things a
1567 little clearer.
1568 
1569 * If open for writing, pad with up to 3 extra zero bytes before close to
1570 the correct canonical length, calculated from the header. Previously
1571 files could be short due to not padding when writing in NOFILL mode.
1572 
1573 * Doubled arbitrary limits on number of dimensions, variables, attributes,
1574 and length of names.
1575 
1576 * Change name of nc\_get\_format() to nc\_inq\_format(). Add analogous
1577 interfaces for nf\_inq\_format(), nf90\_inquire(), and
1578 NcFile::get\_format() to f77, f90, and C++ interfaces. Document new
1579 function in texinfo files. Add minimal test to nc\_test, nf\_test.
1580 
1581 ### 3.6.1-beta3 2005-02-17
1582 
1583 * Added function nc\_get\_format(int ncid, int\* formatp) that returns
1584 either NC\_FORMAT\_CLASSIC or NC\_FORMAT\_64BIT for a CDF1 or CDF2 file,
1585 respectively.
1586 
1587 * Added test to nc\_test that detects whether format version was changed
1588 after a file is reopened and define mode is entered.
1589 
1590 * Correctly configure for Intel ifort Fortran compiler on Linux.
1591 
1592 ### 3.6.0-p1 2005-02-18
1593 
1594 * Fixed bug that changes CDF2 files to CDF1 files if CDF2 file is reopened
1595 for write access and either an attribute is changed or define mode is
1596 entered.
1597 
1598 ### 3.6.1-beta2 2005-1-6
1599 
1600 * Fixed absoft compile problem. Maybe.
1601 
1602 ### 3.6.1-beta1 2005-1-3
1603 
1604 * Fixed Cygwin C++ problem.
1605 
1606 * Fixed large file problem in MS Visual C++.NET environment.
1607 
1608 * More information in installation and porting guide.
1609 
1610 ## 3.6.0 2004-12-16
1611 
1612 * Added texinfo source for the documentation.
1613 
1614 * Added large file tests to Windows directory in distribution.
1615 
1616 * Modified win32 visual studio project files so that m4 is no longer
1617 required to build netcdf under visual studio.
1618 
1619 * Modified rules.make to use install instead of cp, fixing install problem
1620 for cygwin users.
1621 
1622 * Modified configure/install stuff to support HP-UX.
1623 
1624 * Modified configure/install stuff to support G95.
1625 
1626 * In the f90 interface, applied Arnaud Desitter's fixes to correct
1627 mismatches between scalar and array arguments, eliminating (legitimate)
1628 complaints by the NAGWare f95 compiler. Also fixed bugs introduced in
1629 3.6.0-beta5 in the mapped array interfaces.
1630 
1631 ### 3.6.0-beta6 2004-10-05
1632 
1633 * Fixed AIX 64-bit/largefile install problems.
1634 
1635 * Removed FAQ section from netcdf.texi User's Guide, in deference to
1636 online version that can be kept up to date more easily.
1637 
1638 ### 3.6.0-beta5 2004-10-04
1639 
1640 * Fixed assertion violation on 64-bit platforms when size of last fixed
1641 size variable exceeds 2\^32 - 1.
1642 
1643 * Removed another restriction on file size by making record size (derived
1644 from other sizes, not part of the format) an off\_t instead of a
1645 size\_t, when an off\_t is larger than a size\_t. This permits records
1646 to be *much* larger in either classic format or 64-bit-offset format.
1647 
1648 * Incorporated patch from Mathis Rosenhauer to improve performance of
1649 Fortran 90 interface for calls to nf90\_put\_var\_TYPE(),
1650 nf90\_get\_var\_TYPE(), nf90\_put\_vara\_TYPE(), and
1651 nf90\_get\_vara\_TYPE() functions by not emulating them with the
1652 corresponding nf90\_put\_varm\_TYPE() and nf90\_get\_varm\_TYPE() calls.
1653 
1654 * Added tests for invalid offsets in classic format when defining multiple
1655 large variables.
1656 
1657 * Improved installation ease. Have configure script use Large File Support
1658 as a default, if available.
1659 
1660 * Add "extra\_test" as a target for testing Large File Support.
1661 
1662 ### 3.6.0-beta3 2004-08-24
1663 
1664 * Upgraded to recent autoconf, changed configure to (hopefully) improve
1665 installation. Also added macros to deal with large file systems.
1666 
1667 * Added nf\_set\_default\_format to Fortran interface.
1668 
1669 * Added testing to the set\_default\_format functions to nc\_test and
1670 nf\_test.
1671 
1672 * Added documentation to the man page for set\_default\_format functions.
1673 
1674 * Added two new error return codes to C, f77, and f90 interfaces for
1675 invalid dimension size and for bad variable size. Made test for max
1676 dimension size depend on whether 64-bit offsets used. Fixed bug with
1677 dimension sizes between 2\^31 and 2\^32 (for byte variables).
1678 
1679 * Fixed ncdump to properly print dimensions larger than 2\^31.
1680 
1681 * Fixed ncgen to properly handle dimensions between 2\^31 and 2\^32.
1682 
1683 ### 3.6.0-beta2
1684 
1685 * Added -v2 (version 2 format with 64-bit offsets) option to
1686 ncgen, to specify that generated files or generated C/Fortran code
1687 should create 64-bit offset files. Also added -x option to ncgen to
1688 specify use of no-fill mode for fast creation of large files.
1689 
1690 * Added function to set default create mode to C interface
1691 (nc\_set\_default\_create).
1692 
1693 * Added win32 directory, with NET subdirectory to hold .NET port of
1694 netCDF. To use, open netcdf.sln with Visual Studio, and do a clean and
1695 then a build of either the debug or release builds. Tests will be run as
1696 part of the build process. VC++ with managed extensions is required
1697 (i.e. VC++.NET).
1698 
1699 * Added windows installer files to build windows binary installs.
1700 
1701 ### 3.6.0-beta1
1702 
1703 * By incorporating Greg Sjaardema's patch, added support for
1704 64-bit offset files, which remove many of the restrictions relating to
1705 very large files (i.e. larger than 2 GB.) This introduces a new data
1706 format for the first time since the original netCDF format was
1707 introduced. Files in this new 64-bit offset format can't be read by
1708 earlier versions of netCDF. Users should continue to use the netCDF
1709 classic format unless they need to create very large files.
1710 
1711 * The test suite, nc\_test, will now be run twice, once for netCDF classic
1712 format testing, and once for 64-bit offset format testing.
1713 
1714 * The implementation of the Fortran-77 interface has been adapted to
1715 version 4.3 of Burkhard Burow's "cfortran.h".
1716 
1717 ### 3.6.0-alpha
1718 
1719 * Added NEC SX specific optimization for NFILL tunable
1720 parameter in libsrc/putget.c
1721 
1722 Added support for the ifc Fortran-90 compiler creating files "netcdf.d"
1723 and "typesizes.d" (instead of ".mod" files).
1724 
1725 * Fixed access to iargc and getarg functions from Fortran-90 for NAG f90
1726 compiler, contributed by Harald Anlauf.
1727 
1728 ## 3.5.1 2004-02-03
1729 
1730 * Updated INSTALL.html for Mac OS X (Darwin).
1731 
1732 * Made the installation of the netCDF Fortran-90 module file more robust
1733 regarding the name of the file.
1734 
1735 * Added support for eight-byte integers in Fortran90 interface.
1736 
1737 * Increased advisory limits in C netcdf.h and Fortran netcdf.inc for
1738 maximum number of dimensions, variables, and attributes.
1739 
1740 * Changed C++ declarations "friend NcFile" to "friend class NcFile" in
1741 cxx/netcdfcpp.h to conform to standard.
1742 
1743 * Added Dan Schmitt's backward compatible extension to the C++ record
1744 interface to work with arbitrary dimension slices.
1745 
1746 * Added C++ documentation note that caller is responsible for deleting
1747 pointer returned by Variable::values() method when no longer needed.
1748 
1749 * Made C++ interface more standard; the result may not compile on some old
1750 pre-standard C++ compilers.
1751 
1752 * Fixed bug in ncgen when parsing values of a multidimensional char
1753 variable that resulted in failure to pad a value with nulls on IRIX.
1754 
1755 * Fixed ncdump bug adding extra quote to char variable data when using -fc
1756 or -ff option.
1757 
1758 * Fixed so compiling with -DNO\_NETCDF\_2 will work for building without
1759 backward-compatibility netCDF-2 interfaces.
1760 
1761 * Eliminated use of ftruncate(), because it fails on FAT32 file systems
1762 under Linux.
1763 
1764 * Initialized a pointer in putget.m4 (used to generate putget.c) that was
1765 involved in uninitialized memory references when nc\_test is run under
1766 Purify. Two users had reported seeing crashes resulting from this
1767 problem in their applications.
1768 
1769 * Reverted pointer initializations in putget.m4, after testing revealed
1770 these caused a performance problem, resulting in many extra calls to
1771 px\_pgin and px\_pgout when running nc\_test.
1772 
1773 * Added checking of size of "dimids" vector in function
1774 nf90\_inquire\_variable(...) and error-returning if it isn't
1775 sufficiently capacious.
1776 
1777 * Added variable index to ncvarget() and ncattinq() error messages and
1778 attribute name to ncattinq() error message.
1779 
1780 * Tweaked configure script to work with recent C++ compilers.
1781 
1782 * Fixed a memory leak in C++ interface, making sure NcVar::cur\_rec[] gets
1783 deleted in NcVar destructor.
1784 
1785 * Reimplemented nc\_sync() fix of version 3.5.0 to eliminate performance
1786 penalty when synchronization is unnecessary.
1787 
1788 * Changed order of targets in Makefile to build Fortran interface last, as
1789 a workaround for problem with make on AIX platforms.
1790 
1791 ## 3.5.0 2001-03-23
1792 
1793 * Added Fortran 90 interface.
1794 
1795 * Changed C macro TIMELEN in file cxx/nctst.cpp to TIMESTRINGLEN to avoid
1796 clash with macro defined on AIX systems in /usr/include/time.h.
1797 
1798 * Fixed miswriting of netCDF header when exiting define mode. Because the
1799 header was always written correctly later, this was only a problem if
1800 there was another reader of the netCDF file.
1801 
1802 * Fixed explicit synchronizing between netCDF writer and readers via the
1803 nc\_sync(), nf\_sync(), and ncsync() functions.
1804 
1805 * Fixed a number of bugs related to attempts to support shrinking the
1806 header in netCDF files when attributes are rewritten or deleted. Also
1807 fixed the problem that nc\_\_endef() did not work as intended in
1808 reserving extra space in the file header, since the extra space would be
1809 compacted again on calling nc\_close().
1810 
1811 * Fixed the "redef bug" that occurred when nc\_enddef() or nf\_enddef() is
1812 called after nc\_redef() or nf\_redef(), the file is growing such that
1813 the new beginning of a record variable is in the next "chunk", and the
1814 size of at least one record variable exceeds the chunk size (see
1815 netcdf.3 man page for a description of this tuning parameter and how to
1816 set it). This bug resulted in corruption of some values in other
1817 variables than the one being added.
1818 
1819 * The "\*\*" tuning functions for the Fortran interface, nf\*\*create,
1820 nf\*\*open, and nf\*\*enddef, are now documented in the Fortran interface
1821 man pages.
1822 
1823 * Add an 'uninstall' target to all the Makefiles. Dave Glowacki
1824 <dglo@SSEC.WISC.EDU> 199810011851.MAA27335
1825 
1826 * Added support for multiprocessing on Cray T3E. Hooks added by Glenn, but
1827 the majority of the work was done at NERSC. Also includes changes to
1828 ffio option specification. Patch rollup provided by R. K. Owen
1829 <rkowen@Nersc.GOV>. The following functions are added to the public
1830 interface. nc**create\_mp() nc**open\_mp() nc\_set\_base\_pe()
1831 nc\_inq\_base\_pe()
1832 
1833 * Fixed makefile URL for Win32 systems in INSTALL file.
1834 
1835 * Made test for UNICOS system in the configure script case independent.
1836 
1837 * Ported to the following systems: AIX 4.3 (both /bin/xlc and
1838 /usr/vac/bin/xlc compilers) IRIX 6.5 IRIX64 6.5
1839 
1840 * Changed the extension of C++ files from ".cc" to ".cpp". Renamed the C++
1841 interface header file "netcdfcpp.h" instead of "netcdf.hh", changing
1842 "netcdf.hh" to include "netcdfcpp.h" for backward compatibility.
1843 
1844 * Treat "FreeBSD" systems the same as "BSD/OS" system w.r.t. Fortran and
1845 "whatis" database.
1846 
1847 * Corrected manual pages: corrected spelling of "enddef" (was "endef") and
1848 ensured that the words "index" and "format" will be correctly printed.
1849 
1850 * Updated support for Fortran-calling-C interface by updating
1851 "fortran/cfortran.h" from version 3.9 to version 4.1. This new version
1852 supports the Portland Group Fortran compiler (C macro "pgiFortran") and
1853 the Absoft Pro Fortran compiler (C macro "AbsoftProFortran").
1854 
1855 * Corrected use of non-integral-constant-expression in specifying size of
1856 temporary arrays in file "libsrc/ncx\_cray.c".
1857 
1858 * Added Compaq Alpha Linux workstation example to INSTALL file.
1859 
1860 * Ported cfortran.h to Cygnus GNU Win32 C compiler (gcc for Windows).
1861 
1862 * Fixed bug in ncdump using same CDL header name when called with multiple
1863 files.
1864 
1865 * Added new NULL data type NC\_NAT (Not A Type) to facilitate checking
1866 whether a variable object has had its type defined yet, for example when
1867 working with packed values.
1868 
1869 * Fixed use of compile-time macro NO\_NETCDF\_2 so it really doesn't
1870 include old netCDF-2 interfaces, as intended.
1871 
1872 * Ported to MacOS X Public Beta (Darwin 1.2/PowerPC).
1873 
1874 * Fixed C++ friend declarations to conform to C++ standard.
1875 
1876 * Changed INSTALL file to INSTALL.html instead.
1877 
1878 ## 3.4 1998-03-09
1879 
1880 * Fixed ncx\_cray.c to work on all CRAY systems, not just CRAY1. Reworked
1881 USE\_IEG, which was incorrect. Reworked short support. Now USE\_IEG and
1882 otherwise both pass t\_ncx.
1883 
1884 * To better support parallel systems, static and malloc'ed scratch areas
1885 which were shared in the library were eliminated. These were made
1886 private and on the stack where possible. To support this, the macros
1887 ALLOC\_ONSTACK and FREE\_ONSTACK are defined in onstack.h.
1888 
1889 * The buffered i/o system implementation in posixio.c was reimplemented to
1890 limit the number and size of read() or write() system calls and use
1891 greater reliance on memory to memory copy. This saves a great deal of
1892 wall clock time on slow (NFS) filesystems, especially during
1893 nc\_endef().
1894 
1895 * Added performance tuning "underbar underbar" interfaces nc**open(),
1896 nc**create(), and nc\_\_enddef().
1897 
1898 * The 'sizehint' contract between the higher layers and the ncio layer is
1899 consistently enforced.
1900 
1901 * The C++ interface has been updated so that the deprecated "nclong"
1902 typedef should no longer be required, and casts to nclong no longer
1903 necessary. Just use int or long as appropriate. nclong is still
1904 supported for backwards compatibility.
1905 
1906 * The ncdump utility now displays byte values as signed, even on platforms
1907 where the type corresponding to a C char is unsigned (SGI, for example).
1908 Also the ncdump and ncgen utilities have been updated to display and
1909 accept byte attributes as signed numeric values (with a "b" suffix)
1910 instead of using character constants.
1911 
1912 * In libsrc/error.c:nc\_strerror(int), explain that NC\_EBADTYPE applies
1913 to "\_FillValue type mismatch".
1914 
1915 * Some changes to configure scripts (aclocal.m4), macros.make.in and
1916 ncgen/Makefile to support NEC SUPER-UX 7.2.
1917 
1918 * The "usage" messages of ncgen and ncdump include the string returned
1919 from nc\_inq\_libvers().
1920 
1921 * Corrected some casts in the library so that all phases of the arithmetic
1922 computing file offsets occurs with "off\_t" type. This allows certain
1923 larger netcdf files to be created and read on systems with larger
1924 (64bit) off\_t.
1925 
1926 * In ncgen, multidimensional character variables are now padded to the
1927 length of last dimension, instead of just concatenating them. This
1928 restores an undocumented but convenient feature of ncgen under netCDF-2.
1929 Also, a syntax error is now reliably reported if the netcdf name is
1930 omitted in CDL input.
1931 
1932 * Fortran and C code generated by ncgen for netCDF components whose names
1933 contain "-" characters will now compile and run correctly instead of
1934 causing syntax errors.
1935 
1936 * The library allows "." characters in names as well as "\_" and "-"
1937 characters. A zero length name "" is explicitly not allowed. The ncgen
1938 utility will now permit "." characters in CDL names as well.
1939 
1940 * Memory leaks in the C++ interface NcVar::as\_\*() member functions and
1941 NcFile::add\_var() member function are fixed. The documentation was
1942 fixed where it indicated incorrectly that the library managed value
1943 blocks that the user is actually responsible for deleting.
1944 
1945 * he values of the version 2 Fortran error codes have been modified to
1946 make the version 2 Fortran interface more backward compatible at the
1947 source level.
1948 
1949 * Added support for systems whose Fortran INTEGER*1 and INTEGER*2 types
1950 are equivalent to the C "long" type but whose C "int" and "long" types
1951 differ. An example of such a system is the NEC SX-4 with the "-ew"
1952 option to the f90 compiler (sheesh, what a system!).
1953 
1954 * Fixed Version 2 Fortran compatibility bug: NCVGTG, NCVGGC, NCVPTG, and
1955 NCVPGC didn't work according to the Version 2 documentation if the
1956 innermost mapping value (i.e. IMAP[1]) was zero (indicating that the
1957 netCDF structure of the variable should be used).
1958 
1959 ## 3.3.1 1997-06-16
1960 
1961 * One can now inquire about the number of attributes that a variable has
1962 using the global variable ID.
1963 
1964 * The FORTRAN interface should now work on more systems. In particular:
1965 
1966 * It should now work with FORTRAN compilers whose "integer*1" datatype is
1967 either a C "signed char", "short", or "int" and whose "integer*2"
1968 datatype is either a C "short" or "int".
1969 
1970 * It should now work with FORTRAN compilers that are extremely picky about
1971 source code formatting (e.g. the NAG f90 compiler).
1972 
1973 * The dependency on the non-POSIX utility m4(1) for generating the C and
1974 FORTRAN manual pages has been eliminated.
1975 
1976 * EXTERNAL statements have been added to the FORTRAN include-file
1977 "netcdf.inc" to eliminate excessive warnings about "unused" variables
1978 (which were actually functions) by some compilers (e.g. SunOS 4.1.3's
1979 f77(1) version 1.x).
1980 
1981 * Building the netCDF-3 package no longer requires the existence of the
1982 Standard C macro RAND\_MAX.
1983 
1984 * Fixed an ncdump bug resulting in ncdump reporting Attempt to convert
1985 between text & numbers when \_FillValue attribute of a character
1986 variable set to the empty string "".
1987 
1988 * Made ncgen tests more stringent and fixed various bugs this uncovered.
1989 These included bugs in handling byte attributes on platforms on which
1990 char is unsigned, initializing scalar character variables in generated C
1991 code under "-c" option, interspersing DATA statements with declaration
1992 statements in generated Fortran code under "-f" option, handling empty
1993 string as a value correctly in generated C and Fortran, and handling
1994 escape characters in strings. The Fortran output under the "-f" option
1995 was also made less obscure and more portable, using automatic conversion
1996 with netCDF-3 interfaces instead of "BYTE", "INTEGER*1", or "INTEGER*2"
1997 declarations.
1998 
1999 * Fixed a C++ interface problem that prevented compiling the C++ library
2000 with Digital's cxx compiler.
2001 
2002 * Made ncgen "make test" report failure and stop if test resulted in a
2003 failure of generated C or Fortran code.
2004 
2005 * The file that you are now reading was created to contain a high-level
2006 description of the evolution of the netCDF-3 package.
2007 
2008 ## 3.3 1997-05-15
2009 
2010 * The production version of the netCDF-3 package was released.
2011 
2012 * A comparison of the netCDF-2 and netCDF-3 releases can be found in the
2013 file COMPATIBILITY.
2014 
2015 */

Return to the Main Unidata NetCDF page.
Generated on Sat Feb 16 2019 13:13:27 for NetCDF. NetCDF is a Unidata library.