NetCDF  4.7.1
RELEASE_NOTES.md
1 Release Notes {#RELEASE_NOTES}
2 =============
3 
4 \brief Release notes file for the netcdf-c package.
5 
6 This file contains a high-level description of this package's evolution. Releases are in reverse chronological order (most recent first). Note that, as of netcdf 4.2, the `netcdf-c++` and `netcdf-fortran` libraries have been separated into their own libraries.
7 
8 ## 4.7.2 - TBD
9 
10 ## 4.7.1 - August 27, 2019
11 
12 * [Enhancement] Added unit_test directory, which contains unit tests
13 for the libdispatch and libsrc4 code (and any other directories that
14 want to put unit tests there). Use --disable-unit-tests to run without
15 unit tests (ex. for code coverage analysis).
16 See [GitHub #1458](https://github.com/Unidata/netcdf-c/issues/1458)
17 
18 * [Bug Fix] Remove obsolete _CRAYMPP and LOCKNUMREC macros from
19 code. Also brought documentation up to date in man page. These macros
20 were used in ancient times, before modern parallel I/O systems were
21 developed. Programmers interested in parallel I/O should see
22 nc_open_par() and nc_create_par().
23 See [GitHub #1459](https://github.com/Unidata/netcdf-c/issues/1459)
24 
25 * [Enhancement] Remove obsolete and deprecated functions
26 nc_set_base_pe() and nc_inq_base_pe() from the dispatch table. (Both
27 functions are still supported in the library, this is an internal
28 change only.)
29 See [GitHub #1468](https://github.com/Unidata/netcdf-c/issues/1468)
30 
31 * [Bug Fix] Reverted nccopy behavior so that if no -c parameters
32 are given, then any default chunking is left to the netcdf-c library
33 to decide.
34 See [GitHub #1436](https://github.com/Unidata/netcdf-c/issues/1436)
35 
36 ## 4.7.0 - April 29, 2019
37 
38 * [Enhancement] Updated behavior of `pkgconfig` and `nc-config` to allow the use of the `--static` flags, e.g. `nc-config --libs --static`, which will show information for linking against `libnetcdf` statically. See [Github #1360](https://github.com/Unidata/netcdf-c/issues/1360) and [Github #1257](https://github.com/Unidata/netcdf-c/issues/1257) for more information.
39 
40 * [Enhancement] Provide byte-range reading of remote datasets. This allows
41 read-only access to, for example, Amazon S3 objects and also Thredds Server
42 datasets via the HTTPService access method.
43 See [GitHub #1251](https://github.com/Unidata/netcdf-c/issues/1251).
44 
45 * Update the license from the home-brewed NetCDF license to the standard 3-Clause BSD License. This change does not result in any new restrictions; it is merely the adoption of a standard, well-known and well-understood license in place of the historic NetCDF license written at Unidata. This is part of a broader push by Unidata to adopt modern, standardized licensing.
46 
47 ## 4.6.3 - February 28, 2019
48 
49 * [Bug Fix] Correctly generated `netcdf.pc` generated either by `configure` or `cmake`. If linking against a static netcdf, you would need to pass the `--static` argument to `pkg-config` in order to list all of the downstream dependencies. See [Github #1324](https://github.com/Unidata/netcdf-c/issues/1324) for more information.
50 * Now always write hidden coordinates attribute, which allows faster file opens when present. See [Github #1262](https://github.com/Unidata/netcdf-c/issues/1262) for more information.
51 * Some fixes for rename, including fix for renumbering of varids after a rename (#1307), renaming var to dim without coordinate var. See [Github #1297](https://github.com/Unidata/netcdf-c/issues/1297).
52 * Fix of NULL parameter causing segfaults in put_vars functions. See [Github #1265](https://github.com/Unidata/netcdf-c/issues/1265) for more information.
53 * Fix of --enable-benchmark benchmark tests [Github #1211](https://github.com/Unidata/netcdf-c/issues/1211)
54 * Update the license from the home-brewed NetCDF license to the standard 3-Clause BSD License. This change does not result in any new restrictions; it is merely the adoption of a standard, well-known and well-understood license in place of the historic NetCDF license written at Unidata. This is part of a broader push by Unidata to adopt modern, standardized licensing.
55 * [BugFix] Corrected DAP-releated issues on big-endian machines. See [Github #1321](https://github.com/Unidata/netcdf-c/issues/1321), [Github #1302](https://github.com/Unidata/netcdf-c/issues/1302) for more information.
56 * [BugFix][Enhancement] Various and sundry bugfixes and performance enhancements, thanks to \@edhartnett, \@gsjaardema, \@t-b, \@wkliao, and all of our other contributors.
57 * [Enhancement] Extended `nccopy -F` syntax to support multiple variables with a single invocation. See [Github #1311](https://github.com/Unidata/netcdf-c/issues/1311) for more information.
58 * [BugFix] Corrected an issue where DAP2 was incorrectly converting signed bytes, resulting in an erroneous error message under some circumstances. See [GitHub #1317](https://github.com/Unidata/netcdf-c/issues/1317) for more information. See [Github #1319](https://github.com/Unidata/netcdf-c/issues/1319) for related information.
59 * [BugFix][Enhancement] Modified `nccopy` so that `_NCProperties` is not copied over verbatim but is instead generated based on the version of `libnetcdf` used when copying the file. Additionally, `_NCProperties` are displayed if/when associated with a netcdf3 file, now. See [GitHub #803](https://github.com/Unidata/netcdf-c/issues/803) for more information.
60 
61 ## 4.6.2 - November 16, 2018
62 
63 * [Enhancement] Lazy att read - only read atts when user requests one of them. See [GitHub #857](https://github.com/Unidata/netcdf-c/issues/857).
64 * [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).
65 
66 ## 4.6.2-rc2 November 1, 2018
67 
68 
69 * [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).
70 * [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).
71 * [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).
72 * [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.
73 * [Obsolete] Obsolete the MPIPOSIX flag.
74 * [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.
75 
76 ## 4.6.2-rc1 - September 19, 2018
77 
78 * [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.
79 * [Enhancement] Allow user to set http read buffersize for DAP2 and DAP4 using the tag HTTP.READ.BUFFERSIZE in the .daprc file.
80 * [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).
81 * [Enhancement] Support DAP4 remote tests using a new remote test server locatedon the Unidata JetStream project.
82 * [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.
83 * [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.
84 * [Enhancement] Made CDF5 support enabled by default. See [Github #931](https://github.com/Unidata/netcdf-c/issues/931) for more information.
85 * [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).
86 
87 ## 4.6.1 - March 19, 2018
88 
89 * [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.
90 * [Bug Fix][Enhancement] Allow `nccopy` to control output filter suppresion. See [Github #894](https://github.com/Unidata/netcdf-c/pull/894) for more information.
91 * [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.
92 * [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.
93 * [Enhancement][Internal] Moved HDF4 into a distinct dispatch layer. See [Github #849](https://github.com/Unidata/netcdf-c/pull/849) for more information.
94 
95 ## 4.6.0 - January 24, 2018
96 * [Enhancement] Full support for using HDF5 dynamic filters, both for reading and writing. See the file docs/filters.md.
97 * [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.
98 * [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.
99 * [Bug] Fixed error in tst_parallel2.c. See [Github #545](https://github.com/Unidata/netcdf-c/issues/545) for more information.
100 * [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.
101 * [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.
102 
103 ## 4.5.0 - October 20, 2017
104 
105 * 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.
106 * 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.
107 
108 ### 4.5.0-rc3 - September 29, 2017
109 
110 * [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`.
111 * [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.
112 * [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.
113 * [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.
114 * [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.
115 * [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.
116 * [Bug Fix] Corrected a potential stack buffer overflow. See [GitHub #450](https://github.com/Unidata/netcdf-c/pull/450) for more information.
117 
118 ### 4.5.0-rc2 - August 7, 2017
119 
120 * [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.
121 * [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.
122 
123 ### 4.5.0-rc1 - June 5, 2017
124 
125 * [Enhancement] DAP4 is now included. Since dap2 is the default for urls, dap4 must be specified by
126 (1) using "dap4:" as the url protocol, or
127 (2) appending "#protocol=dap4" to the end of the url, or
128 (3) appending "#dap4" to the end of the url
129 Note that dap4 is enabled by default but remote-testing is
130 disbled until the testserver situation is resolved.
131 * [Enhancement] The remote testing server can now be specified with the `--with-testserver` option to ./configure.
132 * [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.
133 * [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.
134 * [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.
135 * [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.
136 * [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.
137 * [Upgrade] The bash based test scripts have been upgraded to use a common test_common.sh include file that isolates build specific information.
138 * [Upgrade] The bash based test scripts have been upgraded to use a common test_common.sh include file that isolates build specific information.
139 * [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.
140 * [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.
141 * [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.
142 * [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.
143 * [Upgrade] Update utf8proc.[ch] to use the version now maintained by the Julia Language project (https://github.com/JuliaLang/utf8proc/blob/master/LICENSE.md).
144 * [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.
145 * [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.
146 * [Bug] Addressed a potential type punning issue. See [GitHub #351](https://github.com/Unidata/netcdf-c/issues/351) for more information.
147 * [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.
148 * [Bug] Fixed an issue related to potential type punning, see [GitHub #344](https://github.com/Unidata/netcdf-c/issues/344) for more information.
149 * [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.
150 
151 ## 4.4.1.1 - November 21, 2016
152 
153 * [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.
154 * [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.
155 * [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.
156 * [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.
157 * [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.
158 
159 * [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.
160 
161 ## 4.4.1 - June 28, 2016
162 
163 * [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.
164 * [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.
165 
166 ### 4.4.1-RC3 - June 17, 2016
167 
168 * [Bug Fix] Misc. bug fixes and improvements.
169 * [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.
170 * [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.
171 
172 ### 4.4.1-RC2 - May 13, 2016
173 
174 * [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.
175 * [Bug Fix] Cleaned up some dead links in the doxygen-generated documentation.
176 * [Bug Fix] Corrected several issues related to building under Visual Studio 2014.
177 * [Bug Fix] Corrected several test failures related to HDF5 `1.10.0`
178 * [Bug Fix] Reverted SOVersion *current* to 11 from 12; it was incorrectly incremented in netCDF-C release 4.4.1-RC1.
179 * [Enhancement][Windows] Bumped the included libhdf5 to 1.8.16 from 1.8.15 for pre-built Visual Studio installer files.
180 
181 
182 ### 4.4.1-RC1 - April 15, 2016
183 
184 * [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.
185 * [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.
186 * [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.
187 * [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.
188 * [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.
189 * [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.
190 * [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.
191 * [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.
192 * [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.
193 * [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.
194 * [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.
195 
196 ## 4.4.0 Released - January 13, 2016
197 
198 * Bumped SO version to 11.0.0.
199 
200 * 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.
201 
202 * 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.
203 
204 * 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.
205 
206 * Fixed an ambiguity in the grammar for cdl files. See [GitHub #178](https://github.com/Unidata/netcdf-c/issues/178) for more information.
207 
208 * 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.
209 
210 * Modified ncgen to properly handle the L and UL suffixes for integer constants
211  to keep backward compatibility. Now it is the case the single L suffix
212  (e.g. 111L) is treated as a 32 bit integer. This makes it consistent with
213  the fact that NC_LONG (netcdf.h) is an alias for NC_INT. Existing .cdl
214  files should be examined for occurrences of the L prefix to ensure that
215  this change will not affect them.
216  (see Github issue 156[https://github.com/Unidata/netcdf-c/issues/156]).
217 
218 * 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).
219 
220 * 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.
221 
222 ### 4.4.0-RC5 Released - November 11, 2015
223 
224 * 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.
225 
226 ### 4.4.0-RC4 Released - November 10, 2015
227 
228 * Added CDM-5 support via new mode flag called NC_64BIT_DATA (alias NC_CDF5).
229 
230  Major kudos to Wei-Keng Liao for all the effort he put into getting this to work.
231 
232  This cascaded into a number of other changes.
233 
234  1. Renamed libsrcp5 -> libsrcp because PnetCDF can do parallel io for CDF-1, CDF-2 and CDF-5, not just CDF-5.
235  2. Given #1, then the NC_PNETCDF mode flag becomes a subset of NC_MPIIO, so made NC_PNETCDF an alias for NC_MPII.
236  3. NC_FORMAT_64BIT is now deprecated. Use NC_FORMAT_64BIT_OFFSET.
237 
238 Further information regarding the CDF-5 file format specifrication may be found here: http://cucis.ece.northwestern.edu/projects/PnetCDF/CDF-5.html
239 
240 * Modified configure.ac to provide finer control over parallel
241  support. Specifically, add flags for:
242 
243  1. HDF5_PARALLEL when hdf5 library has parallel enabled
244  2. --disable-parallel4 to be used when we do not want
245  netcdf-4 to use parallelism even if hdf5 has it enabled.
246 
247 
248 * Deprecating various extended format flags.
249 
250 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:
251 
252 Deprecated | Replaced with
253 -----------|-------------
254 NC\_FORMAT\_NC3 | NC\_FORMATX\_NC3
255 NC\_FORMAT\_NC\_HDF5 | NC\_FORMATX\_NC\_HDF5
256 NC\_FORMAT\_NC4 | NC\_FORMATX\_NC4
257 NC\_FORMAT\_NC\_HDF4 | NC\_FORMATX\_NC\_HDF4
258 NC\_FORMAT\_PNETCDF | NC\_FORMATX\_PNETCDF
259 NC\_FORMAT\_DAP2 | NC\_FORMATX\_DAP2
260 NC\_FORMAT\_DAP4 | NC\_FORMATX\_DAP4
261 NC\_FORMAT\_UNDEFINED | NC\_FORMATX\_UNDEFINED
262 
263 * 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.
264 
265 * 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.
266 
267 ### 4.4.0-RC3 2015-10-08
268 
269 * 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.
270 
271 * 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).
272 
273 * Added a note to the install directions pointing out that parallel make
274 cannot be used for 'make check'.
275 
276 ### 4.4.0-RC2 Released 2015-07-09
277 
278 * Minor bug fixes and cleanup of issues reported with first release candidate.
279 
280 ### 4.4.0-RC1 Released 2015-06-09
281 
282 * 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.
283 
284 * 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.
285 
286 * 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.
287 
288 * 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.
289 
290 * 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.
291 
292 * 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.
293 
294 * 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.
295 
296 * 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.
297 
298 * Added an authorization reference document as oc2/ocauth.html.
299 
300 * Fixed bug resulting in segmentation violation when trying to add a
301  _FillValue attribute to a variable in an existing netCDF-4 file
302  defined without it (thanks to Alexander Barth). See
303  [NCF-187](https://bugtracking.unidata.ucar.edu/browse/NCF-187) for
304  more information.
305 
306 ## 4.3.3.1 Released 2015-02-25
307 
308 * 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.
309 
310 ## 4.3.3 Released 2015-02-12
311 
312 * 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)
313 
314 * Enabled previously-disabled shell-script-based tests for Visual Studio when `bash` is detected.
315 
316 ### 4.3.3-rc3 Released 2015-01-14
317 
318 * 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:
319 
320  * CMake: `-DENABLE_REMOTE_FORTRAN_BOOTSTRAP=ON`
321  * Autotools: `--enable-remote-fortran-bootstrap`
322 
323 Details are as follows:
324 
325 ----
326 
327 Enabling these options creates two new make targets:
328 
329 * `build-netcdf-fortran`
330 * `install-netcdf-fortran`
331 
332 Example Work Flow from netcdf-c source directory:
333 
334 * $ `./configure --enable-remote-fortran-bootstrap --prefix=$HOME/local`
335 * $ `make check`
336 * $ `make install`
337 * $ `make build-netcdf-fortran`
338 * $ `make install-netcdf-fortran`
339 
340 > 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>
341 
342 > 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)
343 
344 ----
345 
346 * 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.
347 
348 * 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.
349 
350 * 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)
351 
352 * 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)
353 
354 * Fixed documentation typo in FILL_DOUBLE definition in classic format specification grammar. Fixed other typos and inconsistencies in Doxygen version of User Guide.
355 
356 * 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)
357 
358 * 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)
359 
360 * 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)
361 
362 * Added a new option, `NC_EXTRA_DEPS`, for cmake-based builds. This is analogous to `LIBS` in autotools-based builds. Example usage:
363 
364  $ cmake .. -NC_EXTRA_DEPS="-lcustom_lib"
365 
366 More details may be found at the Unidata JIRA Dashboard. [NCF-316](https://bugtracking.unidata.ucar.edu/browse/NCF-316)
367 
368 
369 ### 4.3.3-rc2 Released 2014-09-24
370 
371 * Fixed the code for handling character constants
372  in datalists in ncgen. Two of the problems were:
373  1. It failed on large constants
374  2. It did not handle e.g. var = 'a', 'b', ...
375  in the same way that ncgen3 did.
376  See [NCF-309](https://bugtracking.unidata.ucar.edu/browse/NCF-309).
377 
378 * 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).
379 
380  > Determining the presence of `netcdf_meta.h` can also be accomplished by methods common to autotools and cmake-based build systems.
381 
382 * Changed `Doxygen`-generated documentation hosted by Unidata to use more robust server-based searching.
383 * Corrected embedded URLs in release notes.
384 * Corrected an issue where building with HDF4 support with Visual Studio would fail.
385 
386 ### 4.3.3-rc1 Released 2014-08-25
387 
388 * Added `CMake`-based export files, contributed by Nico Schlömer. See https://github.com/Unidata/netcdf-c/pull/74.
389 
390 * Documented that ncgen input can come from standard input.
391 
392 * Regularized generation of libnetcdf.settings file to make parsing it easier.
393 
394 * 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)
395 
396 * 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.
397 
398 * 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.
399 
400 * 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.
401  [NCF-308](https://bugtracking.unidata.ucar.edu/browse/NCF-308)
402 
403 * 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.
404 
405 * 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)
406 
407 * Replaced the `NetCDF Library Architecture` image with an updated version from the 2012 NetCDF Workshop slides.
408 
409 * Fix HDF4 files to support chunking.
410  [NCF-272](https://bugtracking.unidata.ucar.edu/browse/NCF-272)
411 
412 * 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).
413 
414 
415 * 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).
416 
417 * Removed redundant variable `BUILD_DOCS` from the CMake configuration file. See the issue at github: [#59](https://github.com/Unidata/netcdf-c/issues/59).
418 
419 * 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)
420 
421 * 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.
422 
423 ## 4.3.2 Released 2014-04-23
424 
425 * 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.
426 
427 * The oc .dodsrc reader was improperly handling the user name and password entries. [NCF-299](https://bugtracking.unidata.ucar.edu/browse/NCF-299)
428 
429 * 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:
430 
431  * `NC_TEST_DROP_SITE` - Specify an alternative Dashboard by URL or IP address.
432 
433  * `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.
434 
435 * Return an error code on open instead of an assertion violation for truncated file.
436 
437 * Documented limit on number of Groups per netCDF-4 file (32767).
438 
439 ### 4.3.2-rc2 Released 2014-04-15
440 
441 * Cleaned up a number of CMake inconsistencies related to CMake usage, parallel builds.
442 * Now passing -Wl,--no-undefined to linker when appropriate.
443 * Corrected an issue preventing large file tests from running correctly under Windows.
444 * Misc Bug Fixes detected by static analysis.
445 
446 ### 4.3.2-rc1 Released 2014-03-20
447 
448 * Pre-built Windows downloads will now be bundled with the latest (as of the time of this writing) versions of the various dependencies:
449  * `hdf5: 1.8.12`
450  * `zlib: 1.2.8`
451  * `libcurl: 7.35.0`
452 
453 * 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):
454  * --enable-dap-auth-tests
455  * -DENABLE\_DAP\_AUTH\_TESTS
456 
457 * Fixed small default chunk size for 1-dimensional record variables. [NCF-211](https://bugtracking.unidata.ucar.edu/browse/NCF-211)
458 
459 * Cleaned up type handling in netCDF-4 to fix bugs with fill-values.
460 
461 * Corrected "BAIL" macros to avoid infinite loop when logging is disabled and an error occurs.
462 
463 * 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.
464 
465 * Made type structure sharable by committed datatypes and variables that use it.
466 
467 * Handled string datatypes correctly, particularly for fill value attributes. Expanded testing for string fill values.
468 
469 * Simplified iteration of objects in the file when it's opened, tracking fewer objects and using less memory.
470 
471 * 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)
472 
473 * 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)
474 
475 * Addressed an issue related to old DAP servers. [NCF-287](https://bugtracking.unidata.ucar.edu/browse/NCF-287)
476 
477 * Modified nc_{get/put}_vars to no longer use
478  nc_get/put_varm. They now directly use nc_get/put_vara
479  directly. This means that nc_get/put_vars now work
480  properly for user defined types as well as atomic types.
481  [NCF-228] (https://bugtracking.unidata.ucar.edu/browse/NCF-228)
482 
483 ## 4.3.1.1 Released 2014-02-05
484 
485 This is a bug-fix-only release for version 4.3.1.
486 
487 * Corrected a DAP issue reported by Jeff Whitaker related to non-conforming servers.
488 
489 * Corrected an issue with DAP tests failing in a 64-bit Cygwin environment. [NCF-286](https://bugtracking.unidata.ucar.edu/browse/NCF-286)
490 
491 ## 4.3.1 Released 2014-01-16
492 
493 * 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]
494 
495 [NCF-273]:https://bugtracking.unidata.ucar.edu/browse/NCF-273
496 
497 
498 ### 4.3.1-rc6 Released 2013-12-19
499 
500 * Fixed fill value handling for string types in nc4\_get\_vara().
501 
502 * Corrected behavior of nc\_inq\_unlimdim and nv\_inq\_unlimdims to report dimids
503  in same order as nc\_inq\_dimids.
504 
505 * 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.
506 
507 * A number of previously-disabled unit tests were reviewed and made active.
508 
509 
510 ### 4.3.1-rc5 Released 2013-12-06
511 
512 * When opening a netCDF-4 file, streamline the iteration over objects in the underlying HDF5 file.
513 
514 * Fixed netCDF-4 failure when renaming a dimension and renaming a variable using that dimension, in either order. [NCF-177]
515 
516 [NCF-177]:https://bugtracking.unidata.ucar.edu/browse/NCF-177
517 
518 * 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.
519 
520 * Fixed bug in ncgen; it was not properly filling empty string constants ("") to be the proper length. [NCF-279]
521 
522 [NCF-279]:https://bugtracking.unidata.ucar.edu/browse/NCF-279
523 
524 * Fixed bug in ncgen where it was interpreting int64 constants
525  as uint64 constants. [NCF-278]
526 
527 [NCF-278]:https://bugtracking.unidata.ucar.edu/browse/NCF-278
528 
529 * Fixed bug in handling Http Basic Authorization. The code was actually there but was not being executed. [NCF-277]
530 
531 [NCF-277]:https://bugtracking.unidata.ucar.edu/browse/NCF-277
532 
533 * 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]
534 
535 [NCF-276]:https://bugtracking.unidata.ucar.edu/browse/NCF-276
536 
537 * Fixed bugs with ncdump annotation of values, using -b or -f
538  options. [NCF-275]
539 
540 [NCF-275]:https://bugtracking.unidata.ucar.edu/browse/NCF-275
541 
542 
543 ### 4.3.1-rc4 Released 2013-11-06
544 
545 * Addressed an issue on Windows where `fstat` would report an incorrect file size on files > 4GB. [NCF-219]
546 
547 
548 * Added better documentation about accessing ESG datasets.
549  See http://www.unidata.ucar.edu/software/netcdf/docs/esg.html.
550 
551 * Corrected an issue with CMake-based builds enabling HDF4 support where the HDF4 libraries were in a non-standard location.
552 
553 * Fix bug introduced by [NCF-267] where octal constants above
554 '\177' were not recognized as proper octal constants. [NCF-271]
555 
556 [NCF-271]:https://bugtracking.unidata.ucar.edu/browse/NCF-271
557 
558 * 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)
559 
560 
561 
562 ### 4.3.1-rc3 Released 2013-09-24
563 
564 * Modify ncgen to support NUL characters in character array
565  constants. [NCF-267]
566 
567 [NCF-267]:https://bugtracking.unidata.ucar.edu/browse/NCF-267
568 
569 * Modify ncgen to support disambiguating references to
570  an enum constant in a data list. [NCF-265]
571 
572 [NCF-265]:https://bugtracking.unidata.ucar.edu/browse/NCF-265
573 
574 * Corrected bug in netCDF-4 dimension ID ordering assumptions, resulting in access that works locally but fails through DAP server. [NCF-166]
575 
576 [NCF-166]:https://bugtracking.unidata.ucar.edu/browse/NCF-166
577 
578 * 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.
579 
580 * Ensure netCDF-4 compiles with OpenMPI as an alternative to MPICH2. [NCF-160]
581 
582 [NCF-160]:https://bugtracking.unidata.ucar.edu/browse/NCF-160
583 
584 * Addressed issue with hanging Parallel netCDF-4 using HDF5 1.8.10. [NCF-240]
585 
586 [NCF-240]:https://bugtracking.unidata.ucar.edu/browse/NCF-240
587 
588 * Addressed issue with Large File Support on Windows, using both 32 and 64-bit builds. [NCF-219]
589 
590 [NCF-219]:https://bugtracking.unidata.ucar.edu/browse/NCF-219
591 
592 * Removed deprecated directories:
593  * librpc/
594  * udunits/
595  * libcf/
596  * libcdmr/
597 
598 ### 4.3.1-rc2 Released 2013-08-19
599 
600 * Added `configure` and accompanying configuration files/templates to release repository. **These will only be added to tagged releases on GitHub**.
601 
602 * 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*.
603 
604 [NCF-250]:https://bugtracking.unidata.ucar.edu/browse/NCF-250
605 
606 * 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.
607 
608 * Corrected an error with the CMake config files that resulted in the `netcdf.3` manpage not being built or installed.
609 
610 ### 4.3.1-rc1 Released 2013-08-09
611 
612 * 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:
613 
614  $ git clone https://github.com/Unidata/netCDF-C.git
615 
616 * Note: in this release, it is necessary to generate the `configure` script and makefile templates using `autoreconf` in the root netCDF-C directory.:
617 
618  $ autoreconf -i -f
619 
620 * Added `nc_rename_grp` to allow for group renaming in netCDF-4 files. [NCF-204]
621 
622 [NCF-204]: https://bugtracking.unidata.ucar.edu/browse/NCF-204
623 
624 * 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.
625 
626 [cz1]: https://bugtracking.unidata.ucar.edu/browse/NCF-204
627 
628 * 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.
629 
630 * 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]
631  * autotools-based builds: --enable-dynamic-loading
632  * cmake-based builds: -DENABLE\_DYNAMIC\_LOADING=ON
633 
634 [NCF-258]: https://bugtracking.unidata.ucar.edu/browse/NCF-258
635 
636 * 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]
637 
638 [NCF-250]: https://bugtracking.unidata.ucar.edu/browse/NCF-250
639 
640 * 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]
641 
642 [NCF-56]: https://bugtracking.unidata.ucar.edu/browse/NCF-56
643 
644 * Parallel-build portability fixes, particularly for OpenMPI and gcc/gfortran-4.8.x on OSX.
645 
646 * 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.
647 
648 * Fixed various minor documentation problems.
649 
650 ## 4.3.0 Released 2013-04-29
651 
652 * fsync: Changed default in autotools config file; fsync must now be
653 explicitly enabled instead of explicitly disabled. [NCF-239]
654 
655 [NCF-239]: https://bugtracking.unidata.ucar.edu/browse/NCF-239
656 
657 * Fixed netCDF-4 bug where odometer code for libdap2 mishandled stride > 1. Bug reported by Ansley Manke. [NCF-249]
658 
659 [NCF-249]: https://bugtracking.unidata.ucar.edu/browse/NCF-249
660 
661 * Fixed netCDF-4 bug so netCDF just ignores objects of HDF5 reference type in
662 the file, instead of rejecting the file. [NCF-29]
663 
664 [NCF-29]: https://bugtracking.unidata.ucar.edu/browse/NCF-29
665 
666 * Fixed netCDF-4 bug with particular order of creation of dimensions,
667 coordinate variables, and subgroups resulting in two dimensions with the
668 same dimension ID. [NCF-244]
669 
670 [NCF-244]: https://bugtracking.unidata.ucar.edu/browse/NCF-244
671 
672 * Fixed netCDF-4 bug with a multidimensional coordinate variable in a
673 subgroup getting the wrong dimension IDs for its dimensions. [NCF-247]
674 
675 [NCF-247]: https://bugtracking.unidata.ucar.edu/browse/NCF-247
676 
677 * Fixed bug with incorrect fixed-size variable offsets in header getting
678 written when schema changed for files created by PnetCDF Thanks
679 to Wei-keng Liao for developing and contributing the fix. [NCF-234]
680 
681 [NCF-234]: https://bugtracking.unidata.ucar.edu/browse/NCF-234
682 
683 * Fixed bug in handling old servers that do not do proper Grid to
684 Structure conversions. [NCF-232]
685 
686 [NCF-232]: https://bugtracking.unidata.ucar.edu/browse/NCF-232
687 
688 * Replaced the oc library with oc2.0
689 
690 * Fix bug with nc\_get\_var1\_uint() not accepting unsigned ints larger
691 than 2\*\*31. [NCF-226]
692 
693 [NCF-226]: https://bugtracking.unidata.ucar.edu/browse/NCF-226
694 
695 * Fix to convert occurrences of '/' in DAP names to %2f. [NCF-223]
696 
697 [NCF-223]: https://bugtracking.unidata.ucar.edu/browse/NCF-223
698 
699 * Fix bug in netCDF-4 with scalar non-coordinate variables with same name
700 as dimensions. [NCF-222]
701 
702 [NCF-222]: https://bugtracking.unidata.ucar.edu/browse/NCF-222
703 
704 * Fix bug in which calling netCDF-4 functions in which behavior that
705 should not depend on order of calls sometimes produces the wrong
706 results. [NCF-217]
707 
708 [NCF-217]: https://bugtracking.unidata.ucar.edu/browse/NCF-217
709 
710 * Merged in nccopy additions from Martin van Driel to support -g and -v
711 options for specifying which groups or variables are to be copied.
712 [NCF-216]
713 
714 [NCF-216]: https://bugtracking.unidata.ucar.edu/browse/NCF-216
715 
716 * Merged in PnetCDF bugs fixes from Greg Sjaardema. [NCF-214]
717 
718 [NCF-214]: https://bugtracking.unidata.ucar.edu/browse/NCF-214
719 
720 * Modify ncgen so that if the incoming file has a special attribute, then
721 it is used to establish the special property of the netcdf file, but the
722 attribute is not included as a real attribute in the file. [NCF-213].
723 
724 [NCF-213]: https://bugtracking.unidata.ucar.edu/browse/NCF-213
725 
726 * Added library version info to the user-agent string so that the server
727 logs will be more informative. [NCF-210]
728 
729 [NCF-210]: https://bugtracking.unidata.ucar.edu/browse/NCF-210
730 
731 * Added work around for bad servers that sometimes sends DAP dataset with
732 duplicate field names. [NCF-208]
733 
734 [NCF-208]: https://bugtracking.unidata.ucar.edu/browse/NCF-208
735 
736 * Fixed bug with strided access for NC\_STRING type. [NCF-206]
737 
738 [NCF-206]: https://bugtracking.unidata.ucar.edu/browse/NCF-206
739 
740 * Prevented adding an invalid \_FillValue attribute to a variable (with
741 nonmatching type or multiple values), to avoid later error when any
742 record variable is extended. [NCF-190]
743 
744 [NCF-190]: https://bugtracking.unidata.ucar.edu/browse/NCF-190
745 
746 * Fix bug in which some uses of vlen within compounds causes HDF5 errors.
747 [NCF-155]
748 
749 [NCF-155]: https://bugtracking.unidata.ucar.edu/browse/NCF-155
750 
751 * Fixed ncdump bug in display of data values of variables that use
752 multiple unlimited dimensions. [NCF-144]
753 
754 [NCF-144]: https://bugtracking.unidata.ucar.edu/browse/NCF-144
755 
756 * Fix bug in which interspersing def\_var calls with put\_var calls can
757 lead to corrupt metadata in a netCDF file with groups and inherited
758 dimensions. [NCF-134]
759 
760 [NCF-134]: https://bugtracking.unidata.ucar.edu/browse/NCF-134
761 
762 * Building shared libraries works with DAP and netCDF4 functionality.
763 [NCF-205] [NCF-57]
764 
765 [NCF-205]: https://bugtracking.unidata.ucar.edu/browse/NCF-205
766 [NCF-57]: https://bugtracking.unidata.ucar.edu/browse/NCF-57
767 
768 * 32-and-64-bit builds are working under MinGW on Windows. [NCF-112]
769 
770 [NCF-112]: https://bugtracking.unidata.ucar.edu/browse/NCF-112
771 
772 * Config.h for Windows compiles are included in the build. [NCF-98]
773 
774 [NCF-98]: https://bugtracking.unidata.ucar.edu/browse/NCF-98
775 
776 * NetCDF-4 dependency on NC\_MAX\_DIMS has been removed. [NCF-71]
777 
778 [NCF-71]: https://bugtracking.unidata.ucar.edu/browse/NCF-71
779 
780 * 64-bit DLL's are produced on Windows. [NCF-65]
781 
782 [NCF-65]: https://bugtracking.unidata.ucar.edu/browse/NCF-65
783 
784 * DLL Packaging issues are resolved. [NCF-54]
785 
786 [NCF-54]: https://bugtracking.unidata.ucar.edu/browse/NCF-54
787 
788 * The CMake build system (with related ctest and cdash systems for
789 testing) has been integrated into netCDF-C. This allows for Visual
790 Studio-based builds in addition to gcc-based builds. This requires at
791 least CMake version 2.8.8. This replaces/supplements the cross-compiled
792 set of Visual-Studio compatible netCDF libraries introduced in netCDF
793 4.2.1-rc1.
794 
795 ## 4.2.1.1 Released 2012-08-03
796 
797 * Patched libdap2/ncdap3.c to fix DAP performance bug remotely accessing large files (> 2GiB).
798 
799 * Patched ncdump/dumplib.c to properly escape special characters in CDL output from ncdump for netCDF-4 string data.
800 
801 
802 ### 4.2.1 Released 2012-07-18
803 
804 * Added a specific NC\_MMAP mode flag to modify behavior of NC\_DISKLESS.
805 
806 * Changed the file protections for NC\_DISKLESS created files to 0666
807 [NCF-182]
808 
809 * Fixed ncdump to report error when an unsupported option is specified.
810 [NCF-180]
811 
812 * Fixed documentation of CDL char constants in Users Guide and ncgen man
813 page.
814 
815 * Fixed memory leak detected by valgrind in one of the HDF5 tests.
816 
817 * Fixed problem with \#elif directives in posixio.c revealed by PGI
818 compilers.
819 
820 ### 4.2.1-rc1 Released 2012-06-18
821 
822 * Ported static and shared libraries (DLL's) for both 32- and 64-bit
823 Windows, including support for DAP remote access, with netCDF-3 and
824 netCDF-4/HDF5 support enabled. The environment for this build is
825 MSYS/MinGW/MinGW64, but the resulting DLLs may be used with Visual
826 Studio. [NCF-112] [NCF-54] [NCF-57] [NCF-65]
827 
828 * Implemented diskless files for all netCDF formats. For nc\_create(),
829 diskless operation performs all operations in memory and then optionally
830 persists the results to a file on close. For nc\_open(), but only for
831 netcdf classic files, diskless operation caches the file in-memory,
832 performs all operations on the memory resident version and then writes
833 all changes back to the original file on close.
834 [NCF-110][NCF-109][NCF-5]
835 
836 * Added MMAP support. If diskless file support is enabled, then it is
837 possible to enable implementation of diskless files using the operating
838 system's MMAP facility (if available). The enabling flag is
839 "--enable-mmap". This is most useful when using nc\_open() and when only
840 parts of files, a single variable say, need to be read.
841 
842 * Added configure flag for --disable-diskless.
843 
844 * Added nccopy command-line options to exploit diskless files, resulting
845 in large speedups for some operations, for example converting unlimited
846 dimension to fixed size or rechunking files for faster access. Upgraded
847 doxygen and man-page documentation for ncdump and nccopy utilities,
848 including new -w option for diskless nccopy, with an example.
849 
850 * Modified Makefile to allow for concurrent builds and to support builds
851 outside the source tree, e.g. 'mkdir build; cd build;
852 SOURCE-DIR/configure' where SOURCE-DIR is the top-level source
853 directory.
854 
855 * Fixed some netCDF-4 bugs with handling strings in non-netCDF-4 HDF5
856 files. [NCF-150]
857 
858 * Fixed bug using nccopy to compress with shuffling that doesn't compress
859 output variables unless they were already compressed in the input file.
860 [NCF-162]
861 
862 * Fixed bug in 64-bit offset files with large records, when last record
863 variable requires more than 2\*\*32 bytes per record. [NCF-164]
864 
865 * Fix bug in which passing a NULL path to nc\_open causes failure.
866 [NCF-173]
867 
868 * Fixed ncgen bugs in parsing and handling opaque data.
869 
870 * Fixed ncdump bug, not escaping characters special to CDL in enumeration
871 labels. [NCF-169]
872 
873 * Fixed bug reading netCDF int into a C longlong or writing from longlong
874 to external int on 32-bit platforms with classic format files. The upper
875 32 bits of the longlong were not cleared on read or used on write.
876 [NCF-171]
877 
878 * Resolved some erroneous returns of BADTYPE errors and RANGE errors due
879 to conflating C memory types with external netCDF types when accessing
880 classic or 64-bit offset files. [NCF-172]
881 
882 * Fixed bug with ncdump -t interpreting unit attribute without base time
883 as a time unit. [NCF-175]
884 
885 * Changed port for testing remote access test server to increase
886 reliability of tests.
887 
888 * Modified ncio mechanism to support multiple ncio packages, so that it is
889 possible to have e.g. posixio and memio operating at the same time.
890 
891 * Generation of documentation is disabled by default. Use --enable-doxygen
892 to generate. [NCF-168]
893 
894 * Added description of configure flags to installation guide.
895 
896 * Clarified documentation of arguments to nc**open() and nc**create() and
897 their default values.
898 
899 * Fixed doxygen installation guide source file to preserve line breaks in
900 code and scripts. [NCF-174]
901 
902 * Cleaned up a bunch of lint issues (unused variables, etc.) and some
903 similar problems reported by clang static analysis.
904 
905 * Updated and fixed pkg-config source file netcdf.pc.in to work with
906 separated netCDF language-specific packages. Also fixed nc-config to
907 call nf-config, ncxx-config, and ncxx4-config for for backward
908 compatibility with use of nc-config in current Makefiles. [NCF-165]
909 [NCF-179]
910 
911 ## 4.2.0 2012-05-01
912 
913 * Completely rebuilt the DAP constraint handling. This primarily affects
914 users who specify a DAP constraint as part of their URL. [NCF-120]
915 
916 * Fixed cause of slow nccopy performance on file systems with many records
917 and large disk block size or many record variables, by accessing data a
918 record at a time instead of a variable at a time. [NCF-142]
919 
920 * Performance improvement to DAP code to support fetching partial
921 variables into the cache; especially important when using nc\_get\_var()
922 API. A partial variable is one that has ranges attached to the
923 projection variables (e.g. x[1:10][20:21]) [NCF-157]
924 
925 * Separate the Fortran and C++ libraries and release the C library and
926 ncdump/ncgen/nccopy without Fortran or C++. [NCF-24]
927 
928 * Documentation mostly migrated to Doxygen, from Texinfo. [NCF-26]
929 
930 * Properly convert vara start/count parameters to DAP [NCF-105][NCF-106]
931 
932 * Fixed major wasted space from previous default variable chunk sizes
933 algorithm. [NCF-81]
934 
935 * Fixed bug in nccopy, in which compression and chunking options were
936 ignored for netCDF-4 input files. [NCF-79]
937 
938 * Fixed bug in ncgen in which large variables (more than 2**18 elements)
939 duplicates the first 2**18 values into subsequent chunks of data
940 [NCF-154].
941 
942 * Applied Greg Sjaardema's nccopy bug fix, not compressing output
943 variables f they were not already using compression on the input file
944 when shuffle specified. [NCF-162]
945 
946 * Fixed problem when a URL is provided that contains only a host name.
947 [NCF-103]
948 
949 * Fixed behavior of ncgen flags so that -o => -lb and, in the absence of
950 any other markers, make the default be -k1 [NCF-158]
951 
952 * Created a text INSTALL file for netCDF-4.2 release. [NCF-161]
953 
954 * Fixed bug in ncgen for vlen arrays as fields of compound types where
955 datalists for those types was improperly interpreted [NCF-145] (but see
956 NCF-155).
957 
958 * Improve use of chunk cache in nccopy utility, making it practical for
959 rechunking large files. [NCF-85]
960 
961 * Fixed nccopy bug copying a netCDF-4 file with a chunksize for an
962 unlimited dimension that is larger than the associated dimension size.
963 [NCF-139]
964 
965 * Fixed nccopy bug when rechunking a netCDF-4 file with a chunkspec option
966 that doesn't explicitly specify all dimensions. [NCF-140]
967 
968 * Fixed bug in netCDF-4 files with non-coordinate variable with the same
969 name as a dimension. [NCF-141]
970 
971 * Incorporated Wei Huang's fix for bug where netCDF-4 sometimes skips over
972 too many values before adding fill values to an in-memory buffer.
973 [NCF-143]
974 
975 * Fixed ncgen bug with netCDF-4 variable-length constants (H/T to Lynton
976 Appel). [NCF-145]
977 
978 * Incorporated Peter Cao's performance fixes using HDF5 link iterator for
979 any group with many variables or types. [NCF-148]
980 
981 * Incorporated Constantine Khroulev's bug fix for invalid usage of
982 MPI\_Comm\_f2c in nc\_create\_par. [NCF-135]
983 
984 * Fixed turning off fill values in HDF5 layers when NOFILL mode is set in
985 netCDF-4 API (thanks to Karen Schuchardt). [NCF-151]
986 
987 * Fixed bug with scalar coordinate variables in netCDF-4 files, causing
988 failure with --enable-extra-tests [NCF-149]
989 
990 * Cleaned up the definition and use of nulldup. [NCF-92][NCF-93][NCF-94]
991 
992 * Fixed various '\#include' bugs. [NCF-91][NCF-96][NCF-127]
993 
994 * v2 API functions modified to properly call the external API instead of
995 directly calling the netcdf-3 functions. [NCF-100]
996 
997 * Fixed problem with 64-bit offset format where writing more than 2\*\*31
998 records resulted in erroneous NC\_EINVALCOORDS error. [NCF-101]
999 
1000 * Restored original functionality of ncgen so that a call with no flags,
1001 only does the syntax check. [NCF-104]
1002 
1003 * Corrected misc. test bugs [NCF-107]
1004 
1005 * Modified ncdump to properly output various new types (ubyte, ushort,
1006 uint, int64, and uint64). [NCF-111]
1007 
1008 * Fixed incorrect link flag for szip in configure.ac [NCF-116]
1009 
1010 * ncdump -t now properly parses ISO "T" separator in date-time strings.
1011 [NCF-16]
1012 
1013 * ncdump -t "human time" functionality now available for attributes and
1014 bounds variables [NCF-70]
1015 
1016 * In ncdump, add -g option to support selection of groups for which data
1017 is displayed. [NCF-11]
1018 
1019 * Now supports bluefire platform [NCF-52]
1020 
1021 * ncdump now properly displays values of attributes of type NC\_USHORT as
1022 signed shorts [NCF-82]
1023 
1024 * Rename some code files so that there are no duplicate filenames.
1025 [NCF-99]
1026 
1027 * Demonstration of netCDF-4 Performance Improvement with KNMI Data
1028 [NCF-113]
1029 
1030 * Dimension size in classic model netCDF-4 files now allows larger sizes
1031 than allowed for 64-bit offset classic files. [NCF-117]
1032 
1033 * ncdump now reports correct error message when "-x" option specifying
1034 NcML output is used on netCDF-4 enhanced model input. [NCF-129]
1035 
1036 * Fixed bug causing infinite loop in ncdump -c of netCDF-4 file with
1037 subgroup with variables using inherited dimensions. [NCF-136]
1038 
1039 ## 4.1.3 2011-06-17
1040 
1041 * Replace use of --with-hdf5= and other such configure options that
1042 violate conventions and causes build problems. Set environment variables
1043 CPPFLAGS, LDFLAGS, and LD\_LIBRARY\_PATH instead, before running
1044 configure script. [NCF-20]
1045 
1046 * Detect from configure script when szlib is needed [NCF-21]
1047 
1048 * Fix bug that can silently zero out portions of a file when writing data
1049 in nofill mode beyond the end of a file, crossing disk-block boundaries
1050 with region to be written while in-memory buffer is in a specific state.
1051 This bug was observed disabling fill mode using Lustre (or other large
1052 blksize file system) and writing data slices in reverse order on disk.
1053 [NCF-22]
1054 
1055 * Fix bug that prevents netCDF-4/HDF5 files created with netCDF-4.1.2 from
1056 being read by earlier versions of netCDF or HDF5 versions before 1.8.7.
1057 [NCF-23]
1058 
1059 * Fix bug in configure that did not make the search for the xdr library
1060 depend on --enable-dap. [NCF-41]
1061 
1062 * Fix ncgen bug that did not use the value of a \_Format attribute in the
1063 input CDL file to determine the kind of output file created, when not
1064 specified by the -k command-line flag. [NCF-42]
1065 
1066 * Fix ncgen bug, not properly handling unsigned longlong parsing. [NCF-43]
1067 
1068 * Fix DAP client code to suppress variables with names such as "x.y",
1069 which DAP protocol interprets as variable "y" inside container "x". Such
1070 variables will be invisible when accessed through DAP client. [NCF-47]
1071 
1072 * Define uint type for unsigned integer, if not otherwise available.
1073 Symptom was compile error involving uint in putget.c. [NCF-49]
1074 
1075 * Fix username+password handling in the DAP client code. [NCF-50]
1076 
1077 * Add test for handling parallel I/O problem from f77 when user forgets to
1078 turn on one of the two MPI flags. [NCF-60]
1079 
1080 * Resolved "make check" problems when ifort compiler. Some "make install"
1081 problems remain when using MPI and shared libraries. [NCF-61]
1082 
1083 * Fix problem with f90\_def\_var not always handle deflate setting when
1084 compiler was ifort. [NCF-67]
1085 
1086 * Check that either MPIIO or MPIPOSIX flag is set when parallel create or
1087 open is called. Also fix examples that didn't set at least one of these
1088 flags. [NCF-68]
1089 
1090 * Improve documentation on handling client-side certificates [NCF-48]
1091 
1092 * Document that array arguments, except in varm functions, must point to
1093 contiguous blocks of memory. [NCF-69]
1094 
1095 * Get netCDF-4 tests working for DLLs generated with mingw. [NCF-6]
1096 
1097 * Make changes necessary for upgrading to HDF5 1.8.7 [NCF-66]
1098 
1099 ### 4.1.3-rc1 2011-05-06
1100 
1101 * Stop looking for xdr if --disable-dap is used.
1102 
1103 * Don't try to run (some) fortran configure tests on machines with no
1104 fortran.
1105 
1106 * Allow nccopy to rechunk with chunksizes larger than current dimension
1107 lengths.
1108 
1109 * Initial implementation of CDMREMOTE is complete; needs comprehensive
1110 testing.
1111 
1112 ### 4.1.3-beta1 2011-04-29
1113 
1114 * Fixed szlib not linking bug.
1115 
1116 * Fixed dreaded "nofill bug", lurking in netCDF classic since at least
1117 1999. Writing more than a disk block's worth of data that crossed disk
1118 block boundaries more than a disk block beyond the end of file in nofill
1119 mode could zero out recently written earlier data that hadn't yet been
1120 flushed to disk.
1121 
1122 * Changed setting for H5Pset\_libver\_bounds to ensure that all netCDF-4
1123 files can be read by HDF5 1.8.x.
1124 
1125 * Merged libncdap3 and libncdap4 into new libdap2 library. The suffix dap2
1126 now refers to the dap protocol. This is in prep for adding dap4 protocol
1127 support.
1128 
1129 * Took out --with-hdf5 and related options due to high cost of maintaining
1130 this non-standard way of finding libraries.
1131 
1132 ## 4.1.2 2011-03-29
1133 
1134 * Changes in build system to support building dlls on cygwin/mingw32.
1135 
1136 * Changes to fix portability problems and get things running on all test
1137 platforms.
1138 
1139 * Some minor documentation fixes.
1140 
1141 * Fixed opendap performance bug for nc\_get\_vars; required adding
1142 nc\_get\_var{s,m} to the dispatch table.
1143 
1144 * Now check for libz in configure.ac.
1145 
1146 * Fixed some bugs and some performance problems with default chunksizes.
1147 
1148 ### 4.1.2-beta2 2011-01-11
1149 
1150 * Add "-c" option to nccopy to specify chunk sizes used in output in terms
1151 of list of dimension names.
1152 
1153 * Rewrite netCDF-4 attribute put code for a large speedup when writing
1154 lots of attributes.
1155 
1156 * Fix nc-config --libs when static dependent libraries are not installed
1157 in the same directory as netCDF libraries (thanks to Jeff Whitaker).
1158 
1159 * Build shared libraries by default, requiring separate Fortran library.
1160 Static libraries now built only with --disable-shared.
1161 
1162 * Refactor of HDF5 file metadata scan for large speedup in opening files,
1163 especially large files.
1164 
1165 * Complete rewrite of the handling of character datalist constants. The
1166 heuristics are documented in ncgen.1.
1167 
1168 * Eliminate use of NC\_MAX\_DIMS and NC\_MAX\_VARS in ncdump and nccopy,
1169 allocating memory as needed and reducing their memory footprint.
1170 
1171 * Add documentation for new nc\_inq\_path() function.
1172 
1173 * Use hashing to speedup lookups by name for files with lots of dimensions
1174 and variables (thanks to Greg Sjaardema).
1175 
1176 * Add options to nccopy to support uniform compression of variables in
1177 output, shuffling, and fixing unlimited dimensions. Documented in
1178 nccopy.1 man page and User's Guide.
1179 
1180 ### 4.1.2-beta1 2010-07-09
1181 
1182 * Fix "ncdump -c" bug identifying coordinate variables in groups.
1183 
1184 * Fix bug in libsrc/posixio.c when providing sizehint larger than default,
1185 which then doesn't get used (thanks to Harald Anlauf).
1186 
1187 * Fix netCDF-4 bug caused when doing enddef/redef and then defining
1188 coordinate variable out of order.
1189 
1190 * Fixed bug in man4 directory automake file which caused documentation to
1191 be rebuilt after make clean.
1192 
1193 * Turned off HDF5 caching when parallel I/O is in use because of its
1194 memory use.
1195 
1196 * Refactoring of netCDF code with dispatch layer to decide whether to call
1197 netCDF classic, netCDF-4, or opendap version of a function.
1198 
1199 * Refactoring of netCDF-4 memory internals to reduce memory use and end
1200 dependence on NC\_MAX\_DIMS and NC\_MAX\_NAME.
1201 
1202 * Modified constraint parser to be more compatible with a java version of
1203 the parser.
1204 
1205 * Modified ncgen to utilize iterators internally; should be no user
1206 visible effect.
1207 
1208 * Fixed two large-file bugs with using classic format or 64-bit offset
1209 format and accessing multidimensional variables with more than 2\*\*32
1210 values.
1211 
1212 ## 4.1.1 2010-04-01
1213 
1214 * Fixed various build issues.
1215 
1216 * Fixed various memory bugs.
1217 
1218 * Fixed bug for netCDF-4 files with dimensions and coord vars written in
1219 different orders, with data writes interspersed.
1220 
1221 * Added test for HDF5-1.8.4 bug.
1222 
1223 * Added new C++ API from Lynton Appel.
1224 
1225 ## 4.1 2010-01-30
1226 
1227 * Much better memory leak checking with valgrind.
1228 
1229 * Added per-variable chunk cache control for better performance. Use
1230 nc\_set\_var\_chunk\_cache / nf\_set\_var\_chunk\_cache /
1231 nf90\_set\_var\_chunk\_cache to set the per-variable cache.
1232 
1233 * Automatically set per-variable chunk cache when opening a file, or
1234 creating a variable, so that the cache is big enough for more than one
1235 chunk. (Can be overridden by user). Settings may be changed with
1236 configure options --max-default-chunk-size and
1237 --default-chunks-in-cache.
1238 
1239 * Better default chunks size. Now chunks are sized to fit inside the
1240 DEFAULT\_CHUNK\_SIZE (settable at configure time with
1241 --with-default-chunk-size= option.)
1242 
1243 * Added nccopy utility for converting among netCDF format variants or to
1244 copy data from DAP servers to netCDF files.
1245 
1246 * The oc library has been modified to allow the occurrence of alias
1247 definitions in the DAS, but they will be ignored.
1248 
1249 * The old ncgen has been moved to ncgen3 and ncgen is now the new ncgen4.
1250 
1251 * Modified --enable-remote-tests to be on by default.
1252 
1253 * Fixed the nc\_get\_varm code as applied to DAP data sources.
1254 
1255 * Added tests for nc-config.
1256 
1257 * Many documentation fixes.
1258 
1259 * Added capability to use the PnetCDF library to
1260 perform parallel I/O on classic and 32-bit offset files. Use the
1261 NC\_PNETCDF mode flag to get parallel I/O for non-netcdf-4 files.
1262 
1263 * Added libcf library to netCDF distribution. Turn it on with configure
1264 option --with-libcf.
1265 
1266 * Added capability to read HDF4 files created with the SD (Scientific
1267 Data) API.
1268 
1269 * The DAP support was revised to closely mimic the original libnc-dap
1270 support.
1271 
1272 * Significantly revised the data handling mechanism in ncgen4 to more
1273 closely mimic the output from the original ncgen.
1274 
1275 * Added prototype NcML output capability to ncgen4. It is specified by the
1276 -lcml flag.
1277 
1278 * Added capability to read HDF5 files without dimension scales. This will
1279 allow most existing HDF5 datasets to be read by netCDF-4.
1280 
1281 * Fixed bug with endianness of default fill values for integer types when
1282 variables are created with a non-native endiannesss and use the default
1283 fill value.
1284 
1285 * Significant refactoring of HDF5 type handling to improve performance and
1286 handle complicated nesting of types in cross-platform cases.
1287 
1288 * Added UDUNITS2 to the distribution. Use --with-udunits to build udunits
1289 along with netcdf.
1290 
1291 * Made changes suggested by HDF5 team to relax creation-order requirement
1292 (for read-only cases) which allows HDF5 1.6.x files to be retrofitted
1293 with dimension scales, and be readable to netCDF-4.
1294 
1295 * Handle duplicate type names within different groups in ncdump. Fix group
1296 path handling in absolute and relative variable names for "-v" option.
1297 
1298 * Added nc-config shell script to help users build netCDF programs without
1299 having to figure out all the compiler options they will need.
1300 
1301 * Fixed ncdump -s bug with displaying special attributes for classic and
1302 64-bit offset files.
1303 
1304 * For writers, nc\_sync() now calls fsync() to flush data to disk sooner.
1305 
1306 * The nc\_inq\_type() function now works for primitive types.
1307 
1308 ## 4.0.1 2009-03-26
1309 
1310 * Added optional arguments to F90 API to nf90\_open/create,
1311 nf90\_create\_var, and nf90\_inquire\_variable so that all netCDF-4
1312 settings may be accomplished with optional arguments, instead of
1313 separate function calls.
1314 
1315 * Added control of HDF5 chunk cache to allow for user performance tuning.
1316 
1317 * Added parallel example program in F90.
1318 
1319 * Changed default chunking to better handle very large variables.
1320 
1321 * Made contiguous the default for fixed size data sets with no filters.
1322 
1323 * Fixed bug in nc\_inq\_ncid; now it returns NC\_ENOGRP if the named group
1324 is not found.
1325 
1326 * Fixed man pages for C and F77 so that netCDF-4 builds will result in man
1327 pages that document new netCDF-4 functions.
1328 
1329 * Added OPeNDAP support based on a new C-only implementation. This is
1330 enabled using --enable-dap option and requires libcurl. The configure
1331 script will attempt to locate libcurl, but if it fails, then its
1332 location must be specified by the --with-curl option.
1333 
1334 ### 4.0.1-beta2 2008-12-26
1335 
1336 * Changed chunksizes to size\_t from int.
1337 
1338 * Fixed fill value problem from F77 API.
1339 
1340 * Fixed problems in netcdf-4 files with multi-dimensional coordinate
1341 variables.
1342 
1343 * Fixed ncgen to properly handle CDL input that uses Windows line endings
1344 ("\r\n"), instead of getting a syntax error.
1345 
1346 * Added "-s" option to ncdump to display performance characterisitics of
1347 netCDF-4 files as special virtual attributes, such as \_Chunking,
1348 \_DeflateLevel, \_Format, and \_Endianness.
1349 
1350 * Added "-t" option to ncdump to display times in human readable form as
1351 strings. Added code to interpret "calendar" attribute according to CF
1352 conventions, if present, in displaying human-readable times.
1353 
1354 * Added experimental version of ncgen4 capable of generating netcdf-4 data
1355 files and C code for creating them. In addition, it supports the special
1356 attributes \_Format, etc.
1357 
1358 * 4.0.1-beta1 2008-10-16
1359 
1360 * Fixed Fortran 90 int64 problems.
1361 
1362 * Rewrote HDF5 read/write code in accordance with performance advice from
1363 Kent.
1364 
1365 * Fixed memory leaks in gets/puts of HDF5 data.
1366 
1367 * Fixed some broken tests for parallel I/O (i.e. MPI) builds.
1368 
1369 * Fixed some cross-compile problems.
1370 
1371 * Rewrote code which placed bogus errors on the HDF5 error stack, trying
1372 to open non-existent attributes and variables. Now no HDF5 errors are
1373 seen.
1374 
1375 * Removed man subdirectory. Now man4 subdirectory is used for all builds.
1376 
1377 * Changed build so that users with access to parallel make can use it.
1378 
1379 * Added experimental support for accessing data through OPeNDAP servers
1380 using the DAP protocol (use --enable-opendap to build it).
1381 
1382 * Fixed ncdump bugs with array field members of compound type variables.
1383 Fixed ncdump bug of assuming default fill value for data of type
1384 unsigned byte.
1385 
1386 ## 4.0 2008-05-31
1387 
1388 * Introduced the use of HDF5 as a storage layer, which allows use of
1389 groups, user-defined types, multiple unlimited dimensions, compression,
1390 data chunking, parallel I/O, and other features. See the netCDF Users
1391 Guide for more information.
1392 
1393 ## 3.6.3 2008-05-31
1394 
1395 * In ncdump and ncgen, added CDL support for UTF-8 encoding of characters
1396 in names and for escaped special chars in names. Made sure UTF-8 names
1397 are normalized using NFC rules before storing or comparing.
1398 
1399 * Handle IEEE NaNs and infinities in a platform-independent way in ncdump
1400 output.
1401 
1402 * Added support for ARM representation of doubles, (thanks to Warren
1403 Turkal).
1404 
1405 * Fixed bug in C++ API creating 64-bit offset files. (See
1406 http://www.unidata.ucar.edu/software/netcdf/docs/known_problems.html#cxx_64-bit).
1407 
1408 * Fixed bug for variables larger than 4 GB. (See
1409 http://www.unidata.ucar.edu/software/netcdf/docs/known_problems.html#large_vars_362).
1410 
1411 * Changed the configure.ac to build either 3.6.x or 4.x build from the
1412 same configure.ac.
1413 
1414 * Build now checks gfortran version and handles it cleanly, also Portland
1415 Group in Intel fortran, with various configurations.
1416 
1417 * A Fortran netcdf.inc file is now created at build time, based on the
1418 setting of --disable-v2.
1419 
1420 * Documentation has been fixed in several places.
1421 
1422 * Upgraded to automake 1.10, autoconf 2.62, and libtool 2.2.2.
1423 
1424 * Includes missing Windows Visual Studio build files.
1425 
1426 * Fixed missing include of config.h in a C++ test program.
1427 
1428 * Fixed maintainer-clean in man directory.
1429 
1430 * Fixed --enable-c-only and make check.
1431 
1432 * Fixed behavior when opening a zero-length file.
1433 
1434 * Many portability enhancements to build cleanly on various platforms.
1435 
1436 * Turned on some old test programs which were not being used in the build.
1437 
1438 ## 3.6.2 2007-03-05
1439 
1440 * Released.
1441 
1442 ### 3.6.2 beta6 2007-01-20
1443 
1444 * Fine tuning of build system to properly handle cygwin, Mingw, and
1445 strange configuration issues.
1446 
1447 * Automake 1.10 has a problem with running our tests on MinGW, so I'm
1448 switching back to automake 1.9.6 for this release.
1449 
1450 ### 3.6.2 beta5 2006-12-30
1451 
1452 * Now netCDF configuration uses autoconf 2.61, and automake 1.10. (Thanks
1453 to Ralf Wildenhues for the patches, and all the autotools help in
1454 general!)
1455 
1456 * Final major revision of netCDF tutorial before the 3.6.2 release.
1457 
1458 * Now netCDF builds under MinGW, producing a windows DLL with the C and
1459 F77 APIs. Use the --enable-shared --enable-dll --disable-cxx
1460 --disable-f90 flags to configure. (C++ and F90 have never been built as
1461 windows DLLs, but might be in a future release if there is user
1462 interest). This has all been documented in the netCDF Porting and
1463 Installation Guide.
1464 
1465 * Now extreme numbers (i.e. those close to the limits of their type) can
1466 be turned off in nc\_test/nf\_test, with --disable-extreme-numbers. It
1467 is turned off automatically for Solaris i386 systems.
1468 
1469 * Added --enable-c-only option to configure. This causes only the core
1470 netCDF-3 C library to be built. It's the same as --disable-f77
1471 --disable-cxx --disable-v2 --disable-utilities.
1472 
1473 * Added --disable-utilities to turn off building and testing of
1474 ncgen/ncdump.
1475 
1476 * Fix a long-standing bug in nf90\_get\_att\_text() pointed out by Ryo
1477 Furue, to make sure resulting string is blank-padded on return. This is
1478 fixed in the Fortran-90 interface, but is impractical to fix in the
1479 Fortran-77 interface implemented via cfortran.h.
1480 
1481 * Now large file tests are run if --enable-large-file-tests is used in the
1482 configure.
1483 
1484 * For Cray users, the ffio module is used if the --enable-ffio option is
1485 passed to configure.
1486 
1487 * Unrolled loops in byte-swapping code used on little-endian platforms to
1488 reduce loop overhead. This optimization resulted in a 22% speedup for
1489 some applications accessing floats or ints (e.g. NCO utilities ncap and
1490 ncbo) and a smaller speedup for shorts or doubles.
1491 
1492 * Added "-k" option to ncdump and ncgen, for identifying and specifying
1493 the kind of netCDF file, one of "classic", "64-bit-offset", "hdf5", or
1494 "hdf5-nc3". Removed output of kind of netCDF file in CDL comment
1495 produced by ncdump.
1496 
1497 * Fixed bug of ncdump seg-faulting if invoked incorrectly with option like
1498 "-c" or "-h" but no file name.
1499 
1500 ### 3.6.2 beta4 2006-08-15
1501 
1502 * Changed F77/F90 man pages from netcdf.3f and netcdf.3f90 to
1503 netcdf\_f77.3 and netcdf\_f90.3. Also fixed broken install of man pages.
1504 
1505 * Changed configure script so that "-g -O2" is no longer set as CFLAGS,
1506 CXXFLAGS, and FFLAGS by default if a GNU compiler is being used. Now
1507 nothing is set.
1508 
1509 * Changed configure script so that fortran flag is set in config.h.
1510 
1511 * Updated Installation and Porting Guide, C++ Interface Guide, F77 and F90
1512 Interface Guides.
1513 
1514 * Build with static libraries by default.
1515 
1516 * Added configure option --enable-separate-fortran, which causes the
1517 fortran library to be built separately. This is turned on automatically
1518 for shared libraries.
1519 
1520 * Improved clarity of error messages.
1521 
1522 * Changed configuration to get cygwin DLL and mingw DLL builds working,
1523 for the C library only (i.e. no F77, F90, or C++ APIs).
1524 
1525 * Changed type of ncbyte in C++ interface from unsigned char to signed
1526 char, for consistency with C interface. The C++ documentation warned
1527 this change would eventually occur.
1528 
1529 * Changed the C++ interface to use only the netCDF-3 C interface instead
1530 of the older netCDF-2 C interface. This has the added benefit that
1531 on-the-fly numeric conversions are now supported using get methods, for
1532 example you can get data of any type as double. When using --disable-v2
1533 flag to configure, the C++ interface can now be built and installed.
1534 
1535 ### 3.6.2 beta3 2006-05-24
1536 
1537 * Changed to use default prefix of /usr/local instead of package-based
1538 prefix of previous releases of netCDF. Use the --prefix argument to the
1539 configure script to override the default.
1540 
1541 * Made separate fortran library file, instead of appending fortran library
1542 functions to the C library file, if --enable-separate-fortran is used
1543 during configure (it's turned on automatically if --enable-shared is
1544 used). If uses, the fortran API users must link to *both* the C library
1545 and the new fortran library, like this: -lnetcdff -lnetcdf
1546 
1547 * Added netCDF examples in C, C++, F77, F90, and CDL. See the examples
1548 subdirectory.
1549 
1550 * Added the NetCDF Tutorial.
1551 
1552 * Minor fixes to some of the netCDF documentation.
1553 
1554 * Made it possible to build without V2 API using --disable-v2 from
1555 configure.
1556 
1557 * Switched to new build system, with automake and libtool. Now shared
1558 libraries are built (as well as static ones) on platforms which support
1559 it. For more information about shared libraries, see
1560 http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#shared_intro
1561 
1562 * Fixed ncdump crash that happened when no arguments were used.
1563 
1564 * Fixed for building with gfortran 4.1.0.
1565 
1566 * Important fix for machines whose SIZEOF\_SIZE\_T != SIZEOF\_LONG, such
1567 as NEC-SX, thanks to Stephen Leak.
1568 
1569 * Fixed C++ on AIX platform.
1570 
1571 * Fixed 64-bit builds on AIX platform.
1572 
1573 * Removed bad assertion that could be triggered in rare cases when reading
1574 a small file.
1575 
1576 * Added comments in v1hpg.c to clarify purpose of each internal function.
1577 
1578 * Make sure filesize is determined in nc\_close() *after* buffers get
1579 flushed.
1580 
1581 * Fix long-standing problem resulting in files up to 3 bytes longer than
1582 necessary if there is exactly one record variable of type byte, char, or
1583 short and if the number of values per record for that variable is not
1584 divisible by 4 (or 2 in the case of short). Now the filesize determined
1585 from header info by NC\_calcsize should be correct in all cases.
1586 
1587 ## 3.6.1 2006-01-31
1588 
1589 * Updated installation manual for 3.6.1.
1590 
1591 * Changed installation to try to provide correct compiler flags for
1592 compiling in 64-bit mode on Sun, Irix, AIX, and HPUX. (HPUX doesn't work
1593 for me, however). Now run configure with --enable-64bit to get a 64 bit
1594 compile.
1595 
1596 * Fixed long-standing bug that would cause small netCDF files to be padded
1597 on the end with zero bytes to 4096 bytes when they were opened and
1598 changed. Now small files should stay small after you change a value.
1599 
1600 * Fixed bug in assertions in putget.c that would only be noticed if you
1601 change the manifest constant NC\_MAX\_DIMS in netcdf.h to be different
1602 from NC\_MAX\_VAR\_DIMS.
1603 
1604 * Moved test ftest.F from fortran to nf\_test directory, and fixed bug in
1605 ftest.F which caused it to return 0 even if tests failed (no tests were
1606 failing, however). Also renamed some test output files to make things a
1607 little clearer.
1608 
1609 * If open for writing, pad with up to 3 extra zero bytes before close to
1610 the correct canonical length, calculated from the header. Previously
1611 files could be short due to not padding when writing in NOFILL mode.
1612 
1613 * Doubled arbitrary limits on number of dimensions, variables, attributes,
1614 and length of names.
1615 
1616 * Change name of nc\_get\_format() to nc\_inq\_format(). Add analogous
1617 interfaces for nf\_inq\_format(), nf90\_inquire(), and
1618 NcFile::get\_format() to f77, f90, and C++ interfaces. Document new
1619 function in texinfo files. Add minimal test to nc\_test, nf\_test.
1620 
1621 ### 3.6.1-beta3 2005-02-17
1622 
1623 * Added function nc\_get\_format(int ncid, int\* formatp) that returns
1624 either NC\_FORMAT\_CLASSIC or NC\_FORMAT\_64BIT for a CDF1 or CDF2 file,
1625 respectively.
1626 
1627 * Added test to nc\_test that detects whether format version was changed
1628 after a file is reopened and define mode is entered.
1629 
1630 * Correctly configure for Intel ifort Fortran compiler on Linux.
1631 
1632 ### 3.6.0-p1 2005-02-18
1633 
1634 * Fixed bug that changes CDF2 files to CDF1 files if CDF2 file is reopened
1635 for write access and either an attribute is changed or define mode is
1636 entered.
1637 
1638 ### 3.6.1-beta2 2005-1-6
1639 
1640 * Fixed absoft compile problem. Maybe.
1641 
1642 ### 3.6.1-beta1 2005-1-3
1643 
1644 * Fixed Cygwin C++ problem.
1645 
1646 * Fixed large file problem in MS Visual C++.NET environment.
1647 
1648 * More information in installation and porting guide.
1649 
1650 ## 3.6.0 2004-12-16
1651 
1652 * Added texinfo source for the documentation.
1653 
1654 * Added large file tests to Windows directory in distribution.
1655 
1656 * Modified win32 visual studio project files so that m4 is no longer
1657 required to build netcdf under visual studio.
1658 
1659 * Modified rules.make to use install instead of cp, fixing install problem
1660 for cygwin users.
1661 
1662 * Modified configure/install stuff to support HP-UX.
1663 
1664 * Modified configure/install stuff to support G95.
1665 
1666 * In the f90 interface, applied Arnaud Desitter's fixes to correct
1667 mismatches between scalar and array arguments, eliminating (legitimate)
1668 complaints by the NAGWare f95 compiler. Also fixed bugs introduced in
1669 3.6.0-beta5 in the mapped array interfaces.
1670 
1671 ### 3.6.0-beta6 2004-10-05
1672 
1673 * Fixed AIX 64-bit/largefile install problems.
1674 
1675 * Removed FAQ section from netcdf.texi User's Guide, in deference to
1676 online version that can be kept up to date more easily.
1677 
1678 ### 3.6.0-beta5 2004-10-04
1679 
1680 * Fixed assertion violation on 64-bit platforms when size of last fixed
1681 size variable exceeds 2\^32 - 1.
1682 
1683 * Removed another restriction on file size by making record size (derived
1684 from other sizes, not part of the format) an off\_t instead of a
1685 size\_t, when an off\_t is larger than a size\_t. This permits records
1686 to be *much* larger in either classic format or 64-bit-offset format.
1687 
1688 * Incorporated patch from Mathis Rosenhauer to improve performance of
1689 Fortran 90 interface for calls to nf90\_put\_var\_TYPE(),
1690 nf90\_get\_var\_TYPE(), nf90\_put\_vara\_TYPE(), and
1691 nf90\_get\_vara\_TYPE() functions by not emulating them with the
1692 corresponding nf90\_put\_varm\_TYPE() and nf90\_get\_varm\_TYPE() calls.
1693 
1694 * Added tests for invalid offsets in classic format when defining multiple
1695 large variables.
1696 
1697 * Improved installation ease. Have configure script use Large File Support
1698 as a default, if available.
1699 
1700 * Add "extra\_test" as a target for testing Large File Support.
1701 
1702 ### 3.6.0-beta3 2004-08-24
1703 
1704 * Upgraded to recent autoconf, changed configure to (hopefully) improve
1705 installation. Also added macros to deal with large file systems.
1706 
1707 * Added nf\_set\_default\_format to Fortran interface.
1708 
1709 * Added testing to the set\_default\_format functions to nc\_test and
1710 nf\_test.
1711 
1712 * Added documentation to the man page for set\_default\_format functions.
1713 
1714 * Added two new error return codes to C, f77, and f90 interfaces for
1715 invalid dimension size and for bad variable size. Made test for max
1716 dimension size depend on whether 64-bit offsets used. Fixed bug with
1717 dimension sizes between 2\^31 and 2\^32 (for byte variables).
1718 
1719 * Fixed ncdump to properly print dimensions larger than 2\^31.
1720 
1721 * Fixed ncgen to properly handle dimensions between 2\^31 and 2\^32.
1722 
1723 ### 3.6.0-beta2
1724 
1725 * Added -v2 (version 2 format with 64-bit offsets) option to
1726 ncgen, to specify that generated files or generated C/Fortran code
1727 should create 64-bit offset files. Also added -x option to ncgen to
1728 specify use of no-fill mode for fast creation of large files.
1729 
1730 * Added function to set default create mode to C interface
1731 (nc\_set\_default\_create).
1732 
1733 * Added win32 directory, with NET subdirectory to hold .NET port of
1734 netCDF. To use, open netcdf.sln with Visual Studio, and do a clean and
1735 then a build of either the debug or release builds. Tests will be run as
1736 part of the build process. VC++ with managed extensions is required
1737 (i.e. VC++.NET).
1738 
1739 * Added windows installer files to build windows binary installs.
1740 
1741 ### 3.6.0-beta1
1742 
1743 * By incorporating Greg Sjaardema's patch, added support for
1744 64-bit offset files, which remove many of the restrictions relating to
1745 very large files (i.e. larger than 2 GB.) This introduces a new data
1746 format for the first time since the original netCDF format was
1747 introduced. Files in this new 64-bit offset format can't be read by
1748 earlier versions of netCDF. Users should continue to use the netCDF
1749 classic format unless they need to create very large files.
1750 
1751 * The test suite, nc\_test, will now be run twice, once for netCDF classic
1752 format testing, and once for 64-bit offset format testing.
1753 
1754 * The implementation of the Fortran-77 interface has been adapted to
1755 version 4.3 of Burkhard Burow's "cfortran.h".
1756 
1757 ### 3.6.0-alpha
1758 
1759 * Added NEC SX specific optimization for NFILL tunable
1760 parameter in libsrc/putget.c
1761 
1762 Added support for the ifc Fortran-90 compiler creating files "netcdf.d"
1763 and "typesizes.d" (instead of ".mod" files).
1764 
1765 * Fixed access to iargc and getarg functions from Fortran-90 for NAG f90
1766 compiler, contributed by Harald Anlauf.
1767 
1768 ## 3.5.1 2004-02-03
1769 
1770 * Updated INSTALL.html for Mac OS X (Darwin).
1771 
1772 * Made the installation of the netCDF Fortran-90 module file more robust
1773 regarding the name of the file.
1774 
1775 * Added support for eight-byte integers in Fortran90 interface.
1776 
1777 * Increased advisory limits in C netcdf.h and Fortran netcdf.inc for
1778 maximum number of dimensions, variables, and attributes.
1779 
1780 * Changed C++ declarations "friend NcFile" to "friend class NcFile" in
1781 cxx/netcdfcpp.h to conform to standard.
1782 
1783 * Added Dan Schmitt's backward compatible extension to the C++ record
1784 interface to work with arbitrary dimension slices.
1785 
1786 * Added C++ documentation note that caller is responsible for deleting
1787 pointer returned by Variable::values() method when no longer needed.
1788 
1789 * Made C++ interface more standard; the result may not compile on some old
1790 pre-standard C++ compilers.
1791 
1792 * Fixed bug in ncgen when parsing values of a multidimensional char
1793 variable that resulted in failure to pad a value with nulls on IRIX.
1794 
1795 * Fixed ncdump bug adding extra quote to char variable data when using -fc
1796 or -ff option.
1797 
1798 * Fixed so compiling with -DNO\_NETCDF\_2 will work for building without
1799 backward-compatibility netCDF-2 interfaces.
1800 
1801 * Eliminated use of ftruncate(), because it fails on FAT32 file systems
1802 under Linux.
1803 
1804 * Initialized a pointer in putget.m4 (used to generate putget.c) that was
1805 involved in uninitialized memory references when nc\_test is run under
1806 Purify. Two users had reported seeing crashes resulting from this
1807 problem in their applications.
1808 
1809 * Reverted pointer initializations in putget.m4, after testing revealed
1810 these caused a performance problem, resulting in many extra calls to
1811 px\_pgin and px\_pgout when running nc\_test.
1812 
1813 * Added checking of size of "dimids" vector in function
1814 nf90\_inquire\_variable(...) and error-returning if it isn't
1815 sufficiently capacious.
1816 
1817 * Added variable index to ncvarget() and ncattinq() error messages and
1818 attribute name to ncattinq() error message.
1819 
1820 * Tweaked configure script to work with recent C++ compilers.
1821 
1822 * Fixed a memory leak in C++ interface, making sure NcVar::cur\_rec[] gets
1823 deleted in NcVar destructor.
1824 
1825 * Reimplemented nc\_sync() fix of version 3.5.0 to eliminate performance
1826 penalty when synchronization is unnecessary.
1827 
1828 * Changed order of targets in Makefile to build Fortran interface last, as
1829 a workaround for problem with make on AIX platforms.
1830 
1831 ## 3.5.0 2001-03-23
1832 
1833 * Added Fortran 90 interface.
1834 
1835 * Changed C macro TIMELEN in file cxx/nctst.cpp to TIMESTRINGLEN to avoid
1836 clash with macro defined on AIX systems in /usr/include/time.h.
1837 
1838 * Fixed miswriting of netCDF header when exiting define mode. Because the
1839 header was always written correctly later, this was only a problem if
1840 there was another reader of the netCDF file.
1841 
1842 * Fixed explicit synchronizing between netCDF writer and readers via the
1843 nc\_sync(), nf\_sync(), and ncsync() functions.
1844 
1845 * Fixed a number of bugs related to attempts to support shrinking the
1846 header in netCDF files when attributes are rewritten or deleted. Also
1847 fixed the problem that nc\_\_endef() did not work as intended in
1848 reserving extra space in the file header, since the extra space would be
1849 compacted again on calling nc\_close().
1850 
1851 * Fixed the "redef bug" that occurred when nc\_enddef() or nf\_enddef() is
1852 called after nc\_redef() or nf\_redef(), the file is growing such that
1853 the new beginning of a record variable is in the next "chunk", and the
1854 size of at least one record variable exceeds the chunk size (see
1855 netcdf.3 man page for a description of this tuning parameter and how to
1856 set it). This bug resulted in corruption of some values in other
1857 variables than the one being added.
1858 
1859 * The "\*\*" tuning functions for the Fortran interface, nf\*\*create,
1860 nf\*\*open, and nf\*\*enddef, are now documented in the Fortran interface
1861 man pages.
1862 
1863 * Add an 'uninstall' target to all the Makefiles. Dave Glowacki
1864 <dglo@SSEC.WISC.EDU> 199810011851.MAA27335
1865 
1866 * Added support for multiprocessing on Cray T3E. Hooks added by Glenn, but
1867 the majority of the work was done at NERSC. Also includes changes to
1868 ffio option specification. Patch rollup provided by R. K. Owen
1869 <rkowen@Nersc.GOV>. The following functions are added to the public
1870 interface. nc**create\_mp() nc**open\_mp() nc\_set\_base\_pe()
1871 nc\_inq\_base\_pe()
1872 
1873 * Fixed makefile URL for Win32 systems in INSTALL file.
1874 
1875 * Made test for UNICOS system in the configure script case independent.
1876 
1877 * Ported to the following systems: AIX 4.3 (both /bin/xlc and
1878 /usr/vac/bin/xlc compilers) IRIX 6.5 IRIX64 6.5
1879 
1880 * Changed the extension of C++ files from ".cc" to ".cpp". Renamed the C++
1881 interface header file "netcdfcpp.h" instead of "netcdf.hh", changing
1882 "netcdf.hh" to include "netcdfcpp.h" for backward compatibility.
1883 
1884 * Treat "FreeBSD" systems the same as "BSD/OS" system w.r.t. Fortran and
1885 "whatis" database.
1886 
1887 * Corrected manual pages: corrected spelling of "enddef" (was "endef") and
1888 ensured that the words "index" and "format" will be correctly printed.
1889 
1890 * Updated support for Fortran-calling-C interface by updating
1891 "fortran/cfortran.h" from version 3.9 to version 4.1. This new version
1892 supports the Portland Group Fortran compiler (C macro "pgiFortran") and
1893 the Absoft Pro Fortran compiler (C macro "AbsoftProFortran").
1894 
1895 * Corrected use of non-integral-constant-expression in specifying size of
1896 temporary arrays in file "libsrc/ncx\_cray.c".
1897 
1898 * Added Compaq Alpha Linux workstation example to INSTALL file.
1899 
1900 * Ported cfortran.h to Cygnus GNU Win32 C compiler (gcc for Windows).
1901 
1902 * Fixed bug in ncdump using same CDL header name when called with multiple
1903 files.
1904 
1905 * Added new NULL data type NC\_NAT (Not A Type) to facilitate checking
1906 whether a variable object has had its type defined yet, for example when
1907 working with packed values.
1908 
1909 * Fixed use of compile-time macro NO\_NETCDF\_2 so it really doesn't
1910 include old netCDF-2 interfaces, as intended.
1911 
1912 * Ported to MacOS X Public Beta (Darwin 1.2/PowerPC).
1913 
1914 * Fixed C++ friend declarations to conform to C++ standard.
1915 
1916 * Changed INSTALL file to INSTALL.html instead.
1917 
1918 ## 3.4 1998-03-09
1919 
1920 * Fixed ncx\_cray.c to work on all CRAY systems, not just CRAY1. Reworked
1921 USE\_IEG, which was incorrect. Reworked short support. Now USE\_IEG and
1922 otherwise both pass t\_ncx.
1923 
1924 * To better support parallel systems, static and malloc'ed scratch areas
1925 which were shared in the library were eliminated. These were made
1926 private and on the stack where possible. To support this, the macros
1927 ALLOC\_ONSTACK and FREE\_ONSTACK are defined in onstack.h.
1928 
1929 * The buffered i/o system implementation in posixio.c was reimplemented to
1930 limit the number and size of read() or write() system calls and use
1931 greater reliance on memory to memory copy. This saves a great deal of
1932 wall clock time on slow (NFS) filesystems, especially during
1933 nc\_endef().
1934 
1935 * Added performance tuning "underbar underbar" interfaces nc**open(),
1936 nc**create(), and nc\_\_enddef().
1937 
1938 * The 'sizehint' contract between the higher layers and the ncio layer is
1939 consistently enforced.
1940 
1941 * The C++ interface has been updated so that the deprecated "nclong"
1942 typedef should no longer be required, and casts to nclong no longer
1943 necessary. Just use int or long as appropriate. nclong is still
1944 supported for backwards compatibility.
1945 
1946 * The ncdump utility now displays byte values as signed, even on platforms
1947 where the type corresponding to a C char is unsigned (SGI, for example).
1948 Also the ncdump and ncgen utilities have been updated to display and
1949 accept byte attributes as signed numeric values (with a "b" suffix)
1950 instead of using character constants.
1951 
1952 * In libsrc/error.c:nc\_strerror(int), explain that NC\_EBADTYPE applies
1953 to "\_FillValue type mismatch".
1954 
1955 * Some changes to configure scripts (aclocal.m4), macros.make.in and
1956 ncgen/Makefile to support NEC SUPER-UX 7.2.
1957 
1958 * The "usage" messages of ncgen and ncdump include the string returned
1959 from nc\_inq\_libvers().
1960 
1961 * Corrected some casts in the library so that all phases of the arithmetic
1962 computing file offsets occurs with "off\_t" type. This allows certain
1963 larger netcdf files to be created and read on systems with larger
1964 (64bit) off\_t.
1965 
1966 * In ncgen, multidimensional character variables are now padded to the
1967 length of last dimension, instead of just concatenating them. This
1968 restores an undocumented but convenient feature of ncgen under netCDF-2.
1969 Also, a syntax error is now reliably reported if the netcdf name is
1970 omitted in CDL input.
1971 
1972 * Fortran and C code generated by ncgen for netCDF components whose names
1973 contain "-" characters will now compile and run correctly instead of
1974 causing syntax errors.
1975 
1976 * The library allows "." characters in names as well as "\_" and "-"
1977 characters. A zero length name "" is explicitly not allowed. The ncgen
1978 utility will now permit "." characters in CDL names as well.
1979 
1980 * Memory leaks in the C++ interface NcVar::as\_\*() member functions and
1981 NcFile::add\_var() member function are fixed. The documentation was
1982 fixed where it indicated incorrectly that the library managed value
1983 blocks that the user is actually responsible for deleting.
1984 
1985 * he values of the version 2 Fortran error codes have been modified to
1986 make the version 2 Fortran interface more backward compatible at the
1987 source level.
1988 
1989 * Added support for systems whose Fortran INTEGER*1 and INTEGER*2 types
1990 are equivalent to the C "long" type but whose C "int" and "long" types
1991 differ. An example of such a system is the NEC SX-4 with the "-ew"
1992 option to the f90 compiler (sheesh, what a system!).
1993 
1994 * Fixed Version 2 Fortran compatibility bug: NCVGTG, NCVGGC, NCVPTG, and
1995 NCVPGC didn't work according to the Version 2 documentation if the
1996 innermost mapping value (i.e. IMAP[1]) was zero (indicating that the
1997 netCDF structure of the variable should be used).
1998 
1999 ## 3.3.1 1997-06-16
2000 
2001 * One can now inquire about the number of attributes that a variable has
2002 using the global variable ID.
2003 
2004 * The FORTRAN interface should now work on more systems. In particular:
2005 
2006 * It should now work with FORTRAN compilers whose "integer*1" datatype is
2007 either a C "signed char", "short", or "int" and whose "integer*2"
2008 datatype is either a C "short" or "int".
2009 
2010 * It should now work with FORTRAN compilers that are extremely picky about
2011 source code formatting (e.g. the NAG f90 compiler).
2012 
2013 * The dependency on the non-POSIX utility m4(1) for generating the C and
2014 FORTRAN manual pages has been eliminated.
2015 
2016 * EXTERNAL statements have been added to the FORTRAN include-file
2017 "netcdf.inc" to eliminate excessive warnings about "unused" variables
2018 (which were actually functions) by some compilers (e.g. SunOS 4.1.3's
2019 f77(1) version 1.x).
2020 
2021 * Building the netCDF-3 package no longer requires the existence of the
2022 Standard C macro RAND\_MAX.
2023 
2024 * Fixed an ncdump bug resulting in ncdump reporting Attempt to convert
2025 between text & numbers when \_FillValue attribute of a character
2026 variable set to the empty string "".
2027 
2028 * Made ncgen tests more stringent and fixed various bugs this uncovered.
2029 These included bugs in handling byte attributes on platforms on which
2030 char is unsigned, initializing scalar character variables in generated C
2031 code under "-c" option, interspersing DATA statements with declaration
2032 statements in generated Fortran code under "-f" option, handling empty
2033 string as a value correctly in generated C and Fortran, and handling
2034 escape characters in strings. The Fortran output under the "-f" option
2035 was also made less obscure and more portable, using automatic conversion
2036 with netCDF-3 interfaces instead of "BYTE", "INTEGER*1", or "INTEGER*2"
2037 declarations.
2038 
2039 * Fixed a C++ interface problem that prevented compiling the C++ library
2040 with Digital's cxx compiler.
2041 
2042 * Made ncgen "make test" report failure and stop if test resulted in a
2043 failure of generated C or Fortran code.
2044 
2045 * The file that you are now reading was created to contain a high-level
2046 description of the evolution of the netCDF-3 package.
2047 
2048 ## 3.3 1997-05-15
2049 
2050 * The production version of the netCDF-3 package was released.
2051 
2052 * A comparison of the netCDF-2 and netCDF-3 releases can be found in the
2053 file COMPATIBILITY.
2054 
2055 */

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