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

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