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lrknox merged 2 commits into from
Jun 2, 2026
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Updated timeline and announcement #876

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9564e11
Updated timeline and announcement
bmribler Jun 1, 2026
e0349c3
Additional improvement
bmribler Jun 2, 2026
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9 changes: 3 additions & 6 deletions README.md
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Expand Up @@ -63,14 +63,11 @@ are tentative.

| Release | New Features |
| -------- | ------------ |
| HDF4 3.1 | Fix memory issues and update documentation to match the software
| HDF4 4.0 | Drop FORTRAN 77 support, Drop netCDF 2.3.2 API + tools, Unified library (maybe) |
| HDF4 4.0 | Drop FORTRAN 77 support, Drop netCDF 2.3.2 API + tools, Fix memory issues and update documentation |

HDF4 3.1 was released at the end of Jun, 2025.
HDF4 4.0 (Tentatively Jun, 2026)
* We will drop support for FORTRAN 77 and move to modern Fortran (2003 or 2008)
HDF4 4.0 (June 2026)
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* We will drop support for F77-only compilers and require a modern Fortran compiler (Fortran 2003 or later).
* HDF4 includes an ancient netCDF 2.3.2 API along with HDF4-built ncdump and ncgen tools. These will be removed in 4.0 and are available by installing the [netCDF-C library](https://github.com/Unidata/netcdf-c).
* (maybe) libdf and libmfhdf will be merged into a single libhdf4 library, Fortran will be built as a separate library

The goal of the HDF4 4.0 release is to address long-standing deficiencies
and bring HDF4 in line with HDF5's build practices. This should allow HDF4
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4 changes: 2 additions & 2 deletions doc/img/release-schedule.plantuml
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Expand Up @@ -17,8 +17,8 @@ Project starts 2023-01-01
[4.3.1] displays on same row as [4.3.0]
[4.3] is colored in #F08FFF

[4.4] starts 2025-01-01 and lasts 78 weeks
[4.4.0] happens 2026-06-30
[4.4] starts 2025-01-01 and lasts 82 weeks
[4.4.0] happens 2026-07-30
[4.4] is colored in #88AADD

@endgantt
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