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HDF5 version 1.14.3-1 currently under development
================================================================================


INTRODUCTION
============

This document describes the differences between this release and the previous
HDF5 release. It contains information on the platforms tested and known
problems in this release. For more details check the HISTORY*.txt files in the
HDF5 source.

Note that documentation in the links below will be updated at the time of each
final release.

Links to HDF5 documentation can be found on The HDF5 web page:

     https://portal.hdfgroup.org/display/HDF5/HDF5

The official HDF5 releases can be obtained from:

     https://www.hdfgroup.org/downloads/hdf5/

Changes from release to release and new features in the HDF5-1.14.x release series
can be found at:

     https://portal.hdfgroup.org/display/HDF5/Release+Specific+Information

If you have any questions or comments, please send them to the HDF Help Desk:

     help@hdfgroup.org


CONTENTS
========

- New Features
- Support for new platforms and languages
- Bug Fixes since HDF5-1.14.2
- Platforms Tested
- Known Problems
- CMake vs. Autotools installations


New Features
============

    Configuration:
    -------------
    -


    Library:
    --------
    -


    Parallel Library:
    -----------------
    -


    Fortran Library:
    ----------------
    -


    C++ Library:
    ------------
    -


    Java Library:
    -------------
    -


    Tools:
    ------
    -


    High-Level APIs:
    ----------------
    -


    C Packet Table API:
    -------------------
    -


    Internal header file:
    ---------------------
    -


    Documentation:
    --------------
    -


Support for new platforms, languages and compilers
==================================================
    -


Bug Fixes since HDF5-1.14.2 release
===================================
    Library
    -------
    - Fixed a bug with the way the Subfiling VFD assigns I/O concentrators

      During a file open operation, the Subfiling VFD determines the topology
      of the application and uses that to select a subset of MPI ranks that
      I/O will be forwarded to, called I/O concentrators. The code for this
      had previously assumed that the parallel job launcher application (e.g.,
      mpirun, srun, etc.) would distribute MPI ranks sequentially among a node
      until all processors on that node have been assigned before going on to
      the next node. When the launcher application mapped MPI ranks to nodes
      in a different fashion, such as round-robin, this could cause the Subfiling
      VFD to incorrectly map MPI ranks as I/O concentrators, leading to missing
      subfiles.

    - Fixed a file space allocation bug in the parallel library for chunked
      datasets

      With the addition of support for incremental file space allocation for
      chunked datasets with filters applied to them that are created/accessed
      in parallel, a bug was introduced to the library's parallel file space
      allocation code. This could cause file space to not be allocated correctly
      for datasets without filters applied to them that are created with serial
      file access and later opened with parallel file access. In turn, this could
      cause parallel writes to those datasets to place incorrect data in the file.

    - Fixed an assertion failure in Parallel HDF5 when a file can't be created
      due to an invalid library version bounds setting

      An assertion failure could occur in H5MF_settle_raw_data_fsm when a file
      can't be created with Parallel HDF5 due to specifying the use of a paged,
      persistent file free space manager
      (H5Pset_file_space_strategy(..., H5F_FSPACE_STRATEGY_PAGE, 1, ...)) with
      an invalid library version bounds combination
      (H5Pset_libver_bounds(..., H5F_LIBVER_EARLIEST, H5F_LIBVER_V18)). This
      has now been fixed.

    - Fixed an assertion in a previous fix for CVE-2016-4332

      An assert could fail when processing corrupt files that have invalid
      shared message flags (as in CVE-2016-4332).

      The assert statement in question has been replaced with pointer checks
      that don't raise errors. Since the function is in cleanup code, we do
      our best to close and free things, even when presented with partially
      initialized structs.

      Fixes CVE-2016-4332 and HDFFV-9950 (confirmed via the cve_hdf5 repo)

    - Fixed performance regression with some compound type conversions

      In-place type conversion was introduced for most use cases in 1.14.2.
      While being able to use the read buffer for type conversion potentially
      improves performance by performing the entire I/O at once, it also
      disables the optimized compound type conversion used when the destination
      is a subset of the source. Disabled in-place type conversion when using
      this optimized conversion and there is no benefit in terms of the I/O
      size.


    Java Library
    ------------
    -


    Configuration
    -------------
    -


    Tools
    -----
    -


    Performance
    -------------
    -


    Fortran API
    -----------
    -


    High-Level Library
    ------------------
    -


    Fortran High-Level APIs
    -----------------------
    -


    Documentation
    -------------
    -


    F90 APIs
    --------
    -


    C++ APIs
    --------
    - 


    Testing
    -------
    - Disabled running of MPI Atomicity tests for OpenMPI major versions < 5

      Support for MPI atomicity operations is not implemented for major
      versions of OpenMPI less than version 5. This would cause the MPI
      atomicity tests for parallel HDF5 to sporadically fail when run
      with OpenMPI. Testphdf5 now checks if OpenMPI is being used and will
      skip running the atomicity tests if the major version of OpenMPI is
      < 5.


Platforms Tested
===================

    Linux 5.19.0-1023-aws            GNU gcc, gfortran, g++
    #24-Ubuntu SMP x86_64 GNU/Linux  (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
    Ubuntu 22.04                     Ubuntu clang version 14.0.0-1ubuntu1
                                     Intel(R) oneAPI DPC++/C++ Compiler 2023.1.0
                                     ifort (IFORT) 2021.9.0 20230302
                                     (cmake and autotools)

    Linux 5.16.14-200.fc35           GNU gcc (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9)
    #1 SMP x86_64  GNU/Linux         GNU Fortran (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9)
    Fedora35                         clang version 13.0.0 (Fedora 13.0.0-3.fc35)
                                     (cmake and autotools)

    Linux 5.14.21-cray_shasta_c      cray-mpich/8.1.23
    #1 SMP x86_64 GNU/Linux              cce/15.0.0
    (frontier)                           gcc/12.2.0
                                     (cmake)

    Linux 5.11.0-34-generic          GNU gcc (GCC) 9.4.0-1ubuntu1
    #36-Ubuntu SMP x86_64 GNU/Linux  GNU Fortran (GCC) 9.4.0-1ubuntu1
    Ubuntu 20.04                     Ubuntu clang version 10.0.0-4ubuntu1
                                     Intel(R) oneAPI DPC++/C++ Compiler 2023.1.0
                                     ifort (IFORT) 2021.9.0 20230302
                                     (cmake and autotools)

    Linux 4.14.0-115.35.1.1chaos     aue/openmpi/4.1.4-arm-22.1.0.12
    #1 SMP aarch64 GNU/Linux             Arm C/C++/Fortran Compiler version 22.1
    (stria)                              (based on LLVM 13.0.1)
                                     (cmake)

    Linux 4.14.0-115.35.1.3chaos     spectrum-mpi/rolling-release
    #1 SMP ppc64le GNU/Linux             clang 12.0.1
    (vortex)                             GCC 8.3.1
                                         XL 2021.09.22
                                     (cmake)

    Linux-4.14.0-115.21.2            spectrum-mpi/rolling-release
    #1 SMP ppc64le GNU/Linux             clang 12.0.1, 14.0.5
    (lassen)                             GCC 8.3.1
                                         XL 16.1.1.2, 2021.09.22, 2022.08.05
                                     (cmake)

    Linux-4.12.14-197.99-default     cray-mpich/7.7.14
    #1 SMP x86_64 GNU/Linux              cce 12.0.3
    (theta)                              GCC 11.2.0
                                         llvm 9.0
                                         Intel 19.1.2

    Linux 3.10.0-1160.36.2.el7.ppc64 gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    #1 SMP ppc64be GNU/Linux         g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
    Power8 (echidna)                 GNU Fortran (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)

    Linux 3.10.0-1160.24.1.el7       GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux          compilers:
    Centos7                              Version 4.8.5 20150623 (Red Hat 4.8.5-4)
    (jelly/kituo/moohan)                 Version 4.9.3, Version 7.2.0, Version 8.3.0,
                                         Version 9.1.0, Version 10.2.0
                                     Intel(R) C (icc), C++ (icpc), Fortran (icc)
                                     compilers:
                                         Version 17.0.0.098 Build 20160721
                                     GNU C (gcc) and C++ (g++) 4.8.5 compilers
                                         with NAG Fortran Compiler Release 7.1(Hanzomon)
                                     Intel(R) C (icc) and C++ (icpc) 17.0.0.098 compilers
                                         with NAG Fortran Compiler Release 7.1(Hanzomon)
                                     MPICH 3.1.4 compiled with GCC 4.9.3
                                     MPICH 3.3 compiled with GCC 7.2.0
                                     OpenMPI 3.1.3 compiled with GCC 7.2.0 and 4.1.2
                                         compiled with GCC 9.1.0
                                     PGI C, Fortran, C++ for 64-bit target on
                                     x86_64;
                                         Versions 18.4.0 and 19.10-0
                                     NVIDIA nvc, nvfortran and nvc++ version 22.5-0
                                     (autotools and cmake)


    Linux-3.10.0-1160.0.0.1chaos     openmpi-4.1.2
    #1 SMP x86_64 GNU/Linux              clang 6.0.0, 11.0.1
    (quartz)                             GCC 7.3.0, 8.1.0
                                         Intel 19.0.4, 2022.2, oneapi.2022.2

    Linux-3.10.0-1160.90.1.1chaos    openmpi/4.1
    #1 SMP x86_64 GNU/Linux              GCC 7.2.0
    (skybridge)                          Intel/19.1
                                     (cmake)

    Linux-3.10.0-1160.90.1.1chaos    openmpi/4.1
    #1 SMP x86_64 GNU/Linux              GCC 7.2.0
    (attaway)                            Intel/19.1
                                     (cmake)

    Linux-3.10.0-1160.90.1.1chaos    openmpi-intel/4.1
    #1 SMP x86_64 GNU/Linux              Intel/19.1.2, 21.3.0 and 22.2.0
    (chama)                          (cmake)

    macOS Apple M1 11.6              Apple clang version 12.0.5 (clang-1205.0.22.11)
    Darwin 20.6.0 arm64              gfortran GNU Fortran (Homebrew GCC 11.2.0) 11.1.0
    (macmini-m1)                     Intel icc/icpc/ifort version 2021.3.0 202106092021.3.0 20210609

    macOS Big Sur 11.3.1             Apple clang version 12.0.5 (clang-1205.0.22.9)
    Darwin 20.4.0 x86_64             gfortran GNU Fortran (Homebrew GCC 10.2.0_3) 10.2.0
    (bigsur-1)                       Intel icc/icpc/ifort version 2021.2.0 20210228

    Mac OS X El Capitan 10.11.6      Apple clang version 7.3.0 from Xcode 7.3
    64-bit                           gfortran GNU Fortran (GCC) 5.2.0
    (osx1011test)                    Intel icc/icpc/ifort version 16.0.2


    Linux 2.6.32-573.22.1.el6        GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux          compilers:
    Centos6                              Version 4.4.7 20120313
    (platypus)                           Version 4.9.3, 5.3.0, 6.2.0
                                     MPICH 3.1.4 compiled with GCC 4.9.3
                                     PGI C, Fortran, C++ for 64-bit target on
                                     x86_64;
                                         Version 19.10-0

    Windows 10 x64                  Visual Studio 2019 w/ clang 12.0.0
                                        with MSVC-like command-line (C/C++ only - cmake)
                                    Visual Studio 2019 w/ Intel C/C++ only cmake)
                                    Visual Studio 2022 w/ clang 15.0.1
                                        with MSVC-like command-line (C/C++ only - cmake)
                                    Visual Studio 2022 w/ Intel C/C++/Fortran oneAPI 2023 (cmake)
                                    Visual Studio 2019 w/ MSMPI 10.1 (C only - cmake)


Known Problems
==============

    CMake files do not behave correctly with paths containing spaces.
    Do not use spaces in paths because the required escaping for handling spaces
    results in very complex and fragile build files.
    ADB - 2019/05/07

    At present, metadata cache images may not be generated by parallel
    applications.  Parallel applications can read files with metadata cache
    images, but since this is a collective operation, a deadlock is possible
    if one or more processes do not participate.

    CPP ptable test fails on both VS2017 and VS2019 with Intel compiler, JIRA
    issue: HDFFV-10628.  This test will pass with VS2015 with Intel compiler.

    The subsetting option in ph5diff currently will fail and should be avoided.
    The subsetting option works correctly in serial h5diff.

    Several tests currently fail on certain platforms:
        MPI_TEST-t_bigio fails with spectrum-mpi on ppc64le platforms.

        MPI_TEST-t_subfiling_vfd and MPI_TEST_EXAMPLES-ph5_subfiling fail with
        cray-mpich on theta and with XL compilers on ppc64le platforms.

        MPI_TEST_testphdf5_tldsc fails with cray-mpich 7.7 on cori and theta.

    Known problems in previous releases can be found in the HISTORY*.txt files
    in the HDF5 source. Please report any new problems found to
    help@hdfgroup.org.


CMake vs. Autotools installations
=================================
While both build systems produce similar results, there are differences.
Each system produces the same set of folders on linux (only CMake works
on standard Windows); bin, include, lib and share. Autotools places the
COPYING and RELEASE.txt file in the root folder, CMake places them in
the share folder.

The bin folder contains the tools and the build scripts. Additionally, CMake
creates dynamic versions of the tools with the suffix "-shared". Autotools
installs one set of tools depending on the "--enable-shared" configuration
option.
  build scripts
  -------------
  Autotools: h5c++, h5cc, h5fc
  CMake: h5c++, h5cc, h5hlc++, h5hlcc

The include folder holds the header files and the fortran mod files. CMake
places the fortran mod files into separate shared and static subfolders,
while Autotools places one set of mod files into the include folder. Because
CMake produces a tools library, the header files for tools will appear in
the include folder.

The lib folder contains the library files, and CMake adds the pkgconfig
subfolder with the hdf5*.pc files used by the bin/build scripts created by
the CMake build. CMake separates the C interface code from the fortran code by
creating C-stub libraries for each Fortran library. In addition, only CMake
installs the tools library. The names of the szip libraries are different
between the build systems.

The share folder will have the most differences because CMake builds include
a number of CMake specific files for support of CMake's find_package and support
for the HDF5 Examples CMake project.

The issues with the gif tool are:
    HDFFV-10592 CVE-2018-17433
    HDFFV-10593 CVE-2018-17436
    HDFFV-11048 CVE-2020-10809
These CVE issues have not yet been addressed and are avoided by not building
the gif tool by default. Enable building the High-Level tools with these options:
    autotools:   --enable-hlgiftools
    cmake:       HDF5_BUILD_HL_GIF_TOOLS=ON