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HDF5 version 1.4.2 currently under development
================================================================================


INTRODUCTION

This document describes the differences between HDF5-1.4.1 and
HDF5-1.4.2, and contains information on the platforms tested and
known problems in HDF5-1.4.2. For more details check the HISTORY.txt
file in the HDF5 source.

The HDF5 documentation can be found on the NCSA ftp server
(ftp.ncsa.uiuc.edu) in the directory:

     /HDF/HDF5/docs/

For more information look at the HDF5 home page at:
   
    http://hdf.ncsa.uiuc.edu/HDF5/

If you have any questions or comments, please send them to:

    hdfhelp@ncsa.uiuc.edu


CONTENTS

- New Features
- Bug Fixes since HDF5-1.4.1
- Documentation
- Platforms Tested
- Supported Configuration Features
- Known Problems


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

    * File sizes greater than 2GB are now supported on Linux systems with
      version 2.4.x or higher kernels.
    * Added a global string variable H5_lib_vers_info_g which holds the
      HDF5 library version information.  This can be used to identify
      an hdf5 library or hdf5 application binary.
      Also added a verification of the consistency between H5_lib_vers_info_g
      and other version information in the source code.
    * Parallel HDF5 now runs on the HP V2500 and HP N4000 machines.
    * F90 API:
        - Added aditional parameter "dims" to the h5dread/h5dwrite and
          h5aread/h5awrite subroutines. This parameter is 1D array of size
          7 and contains the sizes of the data buffer dimensions. 
    * F90 static library is available on Windows platforms. See
      INSTALL_Windows.txt for details.
    * F90 APIs are available on HPUX 11.00 and IBM SP platforms.
    * H5 <-> GIF convertor has been added. This is available under 
      tools/gifconv. The convertor supports the ability to create animated
      gifs as well.
    * Verified correct operation of library on Solaris 2.8 in both 64-bit and
      32-bit compilation modes.  See INSTALL document for instructions on
      compiling the distribution with 64-bit support.
    * Added support for the Metrowerks Code Warrior compiler for Windows.       
         
Bug Fixes since HDF5-1.4.1 Release
==================================

    * Fixed bug with non-zero userblock sizes causing raw data to not
      write correctly.
    * Fixed problems with Pablo build and linking with non-standard MPI I/O.
    * Fixed build on Linux systems with --enable-static-exec flag. It now
      works correctly.
    * IMPORTANT: Fixed file metadata corruption bug which could cause metadata
      data loss in certain situations.
    * The allocation by alignment (H5Pset_alignment) feature code somehow
      got dropped in some 1.3.x version. Re-implemented it with "new and
      improved" algorithm.  It keeps track of "wasted" file-fragment in
      the free-list too.
    * Removed limitation that the data transfer buffer size needed to be
      set for datasets whose dimensions were too large for the 'all' selection
      code to handle.  Any size dimensioned datasets should be handled
      correctly now.
    * Changed behavior of H5Tget_member_type to correctly emulate HDF5 v1.2.x
      when --enable-hdf5v1_2 configure flag is enabled.
    * Added --enable-linux-lfs flag to allow more control over whether to enable
      or disable large file support on Linux.

Documentation
=============


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


    AIX 4.3.3.0 (IBM SP powerpc)  xlc 3.6.6.0
                                  mpcc_r 3.6.6.0
                                  xlf 07.01.0000.0002
                                  mpxlf 07.01.0000.0002
    AIX 4.3 (IBM SP RS6000)       C for AIX Compiler, Version 5.0.2.0
                                  xlf 7.1.0.2
                                  poe 2.4.0.14 (includes mpi)
    Cray T3E sn6711 2.0.5.49a     Cray Standard C Version 6.5.0.1
    Cray SV1 10.0.0.2             Cray Standard C Version 6.5.0.1  
                                  Cray Fortran Version 3.5.0.1
    FreeBSD 4.3                   gcc 2.95.3
                                  g++ 2.95.3
    HP-UX B.10.20                 HP C  HP92453-01 A.10.32.30
                                  HP F90 v2.3
    HP-UX B.11.00                 HP C  HP92453-01 A.11.01.20 
                                  HP F90 v2.4
    HP-UX B.11.00 SysV            HP C  HP92453-01 A.11.01.20 
                                  HP F90 v2.4
    IRIX 6.5                      MIPSpro cc 7.30
    IRIX64 6.5 (64 & n32)         MIPSpro cc 7.3.1.2m
    Linux 2.4.4                   gcc 2.95.3
                                  g++ 2.95.3
    Linux 2.2.18smp               gcc 2.95.2
                                  gcc 2.95.2 with mpich 1.2.1
                                  g++ 2.95.2
                                  pgf90 3.2-4
    OSF1 V4.0                     DEC-V5.2-040 on Digital UNIX V4.0 (Rev 564)
                                  Digital Fortran 90 V4.1-270
    SunOS 5.6                     WorkShop Compilers 5.0 98/12/15 C 5.0 
     (Solaris 2.6)                WorkShop Compilers 5.0 98/10/25 FORTRAN 90 
                                          2.0 Patch 107356-04
    SunOS 5.7                     WorkShop Compilers 5.0 98/12/15 C 5.0
     (Solaris 2.7)                Workshop Compilers 5.0 98/12/15 C++ 5.0 
                                  Workshop Compilers 5.0 98/10/25 FORTRAN 90
                                          2.0 Patch 107356-04 
    SunOS 5.8/32                  Sun WorkShop 6 update 1 C 5.2 2000/09/11
     (Solaris 2.8)                Sun WorkShop 6 update 1 Fortran 95 6.1 
                                          2000/09/11
                                  Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
    SunOS 5.8/64                  Sun WorkShop 6 update 1 C 5.2 2000/09/11
     (Solaris 2.8)                Sun WorkShop 6 update 1 Fortran 95 6.1 
                                          2000/09/11
                                  Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
    TFLOPS r1.0.4 v4.0.7 i386     pgcc Rel 3.1-4i with mpich-1.2.1 with
                                          local modifications
    Windows NT4.0, 2000 (NT5.0)   MSVC++ 6.0
    Windows NT4.0                 Code Warrior 6.0
    Windows 98                    MSVC++ 6.0
                                  DEC Visual Fortran 6.0


Supported Configuration Features Summary
========================================
    In the tables below
          y  = tested and supported
          n  = not supported or not tested in this release
          x  = not working in this release
         ( ) = footnote appears below second table


    Platform       C  C         F90  F90       C++  Shared     zlib  Tools
                      parallel       parallel       libraries
                                                    (5)
    Solaris2.6     y  n         y    n         y    y          y     y
    Solaris2.7     y  y (1)     y    n         y    y          y     y
    Solaris2.8 64  y  n         n    n         y    y          y     y
    Solaris2.8 32  y  n         y    n         y    y          y     y
    IRIX6.5        y  y (1)     n    n         n    y          y     y
    IRIX64_6.5 64  y  y (2)     y    y         n    y          y     y
    IRIX64_6.5 32  y  y (2)     n    n         n    y          y     y
    HPUX10.20      y  n         y    n         n    y          y     y
    HPUX11.00      y  n         y    n         n    y          y     y
    HPUX11 SysV    y  n         y    n         n    y          y     y
    DECOSF         y  n         y    n         n    y          y     y
    T3E            y  y         y    y         n    n          y     y
    SV1            y  n         y    n         n    n          y     y
    TFLOPS         y  y (1)     n    n         n    n          y     y (4)
    AIX-4.3 SP2    y  y         y    y         n    n          y     n
    AIX-4.3 SP3    y  y         y    y         n    n          y     n
    Win2000        y  n         n    n         n    y          y     y
    Win98          y  n         y    n         n    y          y     y
    WinNT          y  n         y    n         n    y          y     y
    WinNT CW       y  n         n    n         n    n          y     y
    FreeBSD        y  n         n    n         y    y          y     y
    Linux 2.2      y  y (1)     y    n         y    y          y     y
    Linux 2.4      y  n         n    n         y    y          y     y


    Platform       1.2            static-   Thread-  SRB  GASS	STREAM-
                   compatibility  exec      safe                VFD
    Solaris2.6     y              x         n        n    n     y
    Solaris2.7     y              x         y        n    n     y
    Solaris2.8 64  y              y         n        n    n     y
    Solaris2.8 32  y              x         n        n    n     y
    IRIX6.5        y              x         y        n    n     y
    IRIX64_6.5 64  y              x         n        n    n     y
    IRIX64_6.5 32  y              x         n        n    n     y
    HPUX10.20      y              y         n        n    n     y
    HPUX11.00      y              x         n        n    n     y
    HPUX11 SysV    y              x         n        n    n     y
    DECOSF         y              y         n        n    n     y
    T3E            y              y         n        n    n     y
    SV1            y              y         n        n    n     y
    TFLOPS         y              y         n        n    n     n
    AIX-4.3 SP2    y              y (3)     n        n    n     y
    AIX-4.3 SP3    y              y         n        n    n     y
    Win2000        y              y         n        n    n     n
    Win98          n              y         n        n    n     n
    WinNT          y              y         n        n    n     n
    WinNT CW       n              n         n        n    n     n
    FreeBSD        y              y         n        n    n     y
    Linux 2.2      y              y         y        n    n     y
    Linux 2.4      y              y         y        n    n     y


    Footnotes:  (1) Using mpich.
                (2) Using mpt and mpich.
                (3) When configured with static-exec enabled, tests fail 
                    in serial mode.
                (4) No HDF4-related tools.
                (5) Shared libraries are provided only for the C library.


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

    * The h5dump tests may fail to match the expected output in some
      platforms (e.g. SP2 parallel, Windows) where the error messages
      directed to "stderr" do not appear in the "right order" with output
      from stdout.  This is not an error.

    * The --enable-static-exec configure flag fails to compile for HP-UX
      11.00 platforms.

    * The executable are always dynamic on IRIX64 6.5(64 and n32) and 
      IRIX 6.5 even if they are configured with --enable-static-exec.
    
    * After "make install" or "make install-doc" one may need to reload
      the source from the tar file before doing another build.

    * See "Known problems" section for the HDF5 1.4.0 release in the
      HISTORY.txt file.