path: root/release_docs/RELEASE.txt

HDF5 version 1.7.32 currently under development
================================================================================


INTRODUCTION

This document describes the differences between HDF5-1.6.* and
HDF5-1.7.*, and contains information on the platforms tested and
known problems in HDF5-1.7.*. 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
- Support for new platforms and languages
- Bug Fixes since HDF5-1.6.0
- Platforms Tested
- Known Problems


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

    Configuration:
    --------------
        - Added some initial support for making purify (or similar memory
            checking products) happier by initializing buffers to zero and
            disabling the internal free list code.  To take advantage of this,
            define 'H5_USING_PURIFY' in your CFLAGS when building the library.
            QAK - 2004/07/23
        - Fixed the long compile time of H5detect.c when v7.x Intel Compiler
	    is used with optimization NOT off.  AKC - 2004/05/20
	- Fixed configure setting of C++ for OSF1 platform. AKC - 2004/01/06
        - Prefix default is changed from /usr/local to `pwd`/hdf5.
            AKC - 2003/07/09

    Library:
    --------
        - 4 new API functions, H5Tencode, H5Tdecode, H5Sencode, H5Sdecode were
            added to the library.  Given object ID, these functions encode and 
            decode HDF5 objects(data type and space) information into and from 
            binary buffer.        SLU - 2004/07/21
        - Modified the way how HDF5 calculates 'pixels_per_scanline' parameter for 
            SZIP compression. Now there is no restriction on the size and shape of the
            chunk except that the total number of elements in the chunk cannot be 
            bigger than 'pixels_per_block' parameter provided by the user.  
                                                                     EIP - 2004/07/21  
        - Added support for SZIP without encoder.  Added H5Zget_filter_info
            and changed H5Pget_filter and H5Pget_filter_by_id to support this
            change.  JL/NF - 2004/06/30
        - SZIP always uses K13 compression.  This flag no longer needs to
            be set when calling H5Pset_szip.  If the flag for CHIP
            compression is set, it will be ignored (since the two are mutually
            exclusive).  JL/NF - 2004/6/30
        - A new API function H5Fget_name was added.  It returns the name
            of the file by object(file, group, data set, named data type,
            attribute) ID.  SLU - 2004/06/29
        - Added support for user defined identifier types.  NF/JL - 2004/06/29
        - A new API function H5Fget_filesize was added.  It returns the
            actual file size of the opened file.  SLU - 2004/06/24
	- New Feature of Data transformation is added.  AKC - 2004/05/03.
        - New exception handler for datatype conversion is put in to 
            replace the old overflow callback function.  This exception
            handler is set through H5Pset_type_conv_cb function.
            SLU - 2004/4/27
        - Added option that if $HDF5_DISABLE_VERSION_CHECK is set to 2,
	    will suppress all library version mismatch warning messages.
	    AKC - 2004/4/14
	- A new type of dataspace, null dataspace(dataspace without any 
            element) was added.  SLU - 2004/3/24
        - Data type conversion(software) from integer to float was added.
            SLU - 2004/3/13 
        - Data type conversion(software) from float to integer was added.
            Conversion from integer to float will be added later.  
            SLU -2004/2/4
        - Added new H5Premove_filter routine to remove I/O pipeline filters
            from dataset creation property lists.  PVN - 2004/01/26
        - Added new 'compare' callback parameter to H5Pregister & H5Pinsert
            routines.  QAK - 2004/01/07
        - Data type conversion(hardware) between integers and floats was added.
            SLU 2003/11/21
        - New function H5Iget_file_id() was added.  It returns file ID given
            an object(dataset, group, or attribute) ID.  SLU 2003/10/29
        - Added new fields to the H5G_stat_t for more information about an
            object's object header.  QAK 2003/10/06
        - Added new H5Fget_freespace() routine to query the free space in a
            given file.  QAK 2003/10/06
        - Added backward compatability with v1.6 for new Error API. SLU - 
            2003/09/24
        - Changed 'objno' field in H5G_stat_t structure from 'unsigned long[2]'
            to 'haddr_t'.  QAK - 2003/08/08
        - Changed 'fileno' field in H5G_stat_t structure from 'unsigned long[2]'
            to 'unsigned long'.  QAK - 2003/08/08
        - Changed 'hobj_ref_t' type from structure with array field to 'haddr_t'.
            QAK - 2003/08/08
        - Object references (hobj_ref_t) can now be compared with the 'objno'
            field in the H5G_stat_t struct for testing if two objects are the
            same within a file.  QAK - 2003/08/08
        - Switched over to new error API. SLU - 2003/07/25

    Parallel Library:
    -----------------
        - Add options of using atomicity and file-sync to test_mpio_1wMr.
          AKC - 2003/11/13
        - Added parallel test, test_mpio_1wMr, which tests if the
          underlaying parallel I/O system is conforming to the POSIX
          write/read requirement.  AKC - 2003/11/12

    Fortran Library:
    ----------------
         - added new functions h5fget_name_f and h5fget_filesize_f 
                                                 EIP 2004/07/08
         - h5dwrite/read_f and h5awrite/read_f functions only accept dims parameter
           of the type INTEGER(HSIZE_T).

    Tools:
    ------
        - h5repack.sh did not report errors encountered during tests.  It does
          now.  AKC - 2004/04/02
        - Added the MPI-I/O and MPI-POSIX drivers to the list of VFL drivers
            available for h5dump and h5ls
        - Added option --vfd= to h5ls to allow a VFL driver to be selected
            by a user.
	- Added option -showconfig to compiler tools (h5cc,h5fc,h5c++).
	  AKC - 2004/01/08
        - Install the "h5cc" and "h5fc" tools as "h5pcc" and "h5pfc"
            respectively if library is built in parallel mode.
            WCW - 2003/11/04
        - Added metadata benchmark (perform/perf_meta).  SLU - 2003/10/03
        - Changed output of "OID"s from h5dump from "<number>-<number>" to
            "<number".  This affects both the "regular" and XML output.
            QAK - 2003/08/08
        - Changed output of file IDs and "OID"s from h5ls from
            "<number>:<number>:<number>:<number>" to "<number>:<number>"
            QAK - 2003/08/08


Support for new platforms, languages and compilers.
=======================================
        - Absoft compiler f95 v9.0 supported on Linux 2.4
                            EIP - 2004/07/29
        - HDF5 Fortran APIs are supported on Mac OSX with IBM XL Fortran
          compiler version 8.1. This is a default compiler.
        - HDF5 Fortran APIs are supported on MAC OSX with Absoft F95 compiler
          version 8.2; set F9X environment varibale to f95, for example
          setenv F9X f95
          Use --disable-shared --enable-static configure flags when Absoft
          compiler is used.
                             EIP - 2004/07/27
        - HDF5 Fortran APIs are supported on MAC OSX with IBM XL Fortran
            Compiler version 8.1 Use "--disable-shared --enable-static"
            configure flags along with the "--enable-fortran" flag to build
            Fortran library.  EIP - 2004/01/07

Bug Fixes since HDF5-1.6.0 release
==================================

    Library
    -------
        - Fixed obscure bug where a filter which failed during chunk allocation
            could allow library to write uncompressed data to disk but think
            the data was compressed.  QAK - 2004/07/29
        - Fixed bug where I/O to an extendible chunked dataset with zero-sized
            dimensions would cause library to fail an assertion.
            QAK - 2004/07/27
        - Fixed bug where chunked datasets which have filters defined,
            allocation time set to "late" and whose chunks don't align with
            the dataspace bounds could have incorrect data stored when
            overwriting the entire dataset on the first write.  QAK - 2004/07/27
        - Fixed bug in H5Sset_extent_simple where setting maximum size to
            non-zero, then to zero would cause an error.  JML - 2004/07/20
        - Allow NULL pointer for buffer parameter to H5Dread & H5Dwrite
            when not writing data ("none" selection or hyperslab or point
            selection with no elements defined).  QAK - 2004/07/20
        - Calling H5Gcreate() on "/" or "." throws an error instead of
            failing quietly. JML - 2004/07/19
        - Fixed bug where setting file address size to be very small could
            trigger an assert if the file grew to more than 64 KB.  Now throws
            an error and data can be recovered. JL/NF - 2004/07/14
        - Fixed bug where "resurrecting" a dataset was failing.
            QAK - 2004/07/14
        - Fixed bug where incorrect data could be read from a chunked dataset
            after it was extended.  QAK - 2004/07/12
        - Fixed failure to read data back from file of compound type with
            variable-length string as field.  SLU - 2004/06/10
        - Fixed potential file corruption bug when a block of metadata could
            overlap the end of the internal metadata accumulator buffer and
            the buffer would be extended correctly, but would incorrectly 
            change it's starting address.  QAK - 2004/06/09
        - Opaque datatype with no tag failed for some operations.  Fixed.
            SLU - 2004/6/3 
        - Fixed potential file corruption bug where dimensions that were
            too large (a value greater than could be represented in 32-bits)
            could cause the incorrect amount of space to be allocated in a
            file for the raw data for the dataset.  QAK - 2004/06/01
	- Fixed dtypes "sw long double -> double" failure in QSC class
            machines.  AKC - 2004/4/16
        - Fixed problem with fletcher32 filter when converting data of different
	    endianess. PVN - 2004/03/10
        - Fixed problem with H5Tget_native_type() not handling opaque fields
            correctly.  QAK - 2004/01/31
        - Fixed several errors in B-tree deletion code which could cause a
            B-tree (used with groups and chunked datasets) to become corrupt
            with the right sequence of deleted objects.  QAK - 2004/01/19
        - Fixed small internal memory leaks of fill-value information.
            QAK - 2004/01/13
        - Fixed bug that caused variable-length datatypes (strings or sequences)
            used for datasets in files with objects that were unlinked to
            fail to be read/written to a file.  QAK - 2004/01/13
        - Detect situation where szip 'pixels per block' is larger than the
            fastest changing dimension of a dataset's chunk size and disallow
            this (due to limits in szip library).  QAK - 2003/12/31
        - Fixed bug with flattened hyperslab selections that would generate
            incorrect hyperslab information with certain high-dimensionality
            combinations of start/stride/count/block information.
            QAK - 2003/12/31
        - Fixed bug with variable-length datatypes used in compound datatypes.
            SLU - 2003/12/29
        - Fixed bug in parallel I/O routines that would cause reads from
            "short datasets" (datasets which were only partially written out)
            to return invalid data.  QAK & AKC - 2003/12/19
        - Fixed bug where scalar dataspaces for attributes were reporting as
            simple dataspaces.  QAK - 2003/12/13
        - Fixed problem with selection offsets of hyperslab selections in
            chunked datasets causing the library to go into an infinite loop.
            QAK - 2003/12/13
        - Fixed H5Giterate to avoid re-using index parameter after iteration
            callback has been called (allows iteration callback to modify the
            index parameter itself).  QAK - 2003/12/06
        - Fixed various floating-point conversion problems, including a
            change which could corrupt data when converting from double->float.
            QAK - 2003/11/24
        - Changed "single process" metadata writing in library to collective
            I/O by all processes, in order to guarantee correct data being
            written with MPI-I/O.  QAK - 2003/11/20
        - Fixed problems with fill values and variable-length types and also
            I/O on VL values that were set to NULL.  QAK - 2003/11/08
        - Fixed problems with MPI datatypes that caused ASCI Q machine to
            hang.  QAK - 2003/10/28
        - Removed HDF5_MPI_PREFER_DERIVED_TYPES environment variable support,
            since it had no benefit.  QAK - 2003/10/28
        - Single hyperslab selections (which were set with only one call to
            H5Sselect_hyperslab) that had dimensions that could be "flattened"
            but were interspersed with dimensions that could not be flattened
            were not correctly handled, causing core dumps.  QAK - 2003/10/25
        - Fixed incorrect datatype of the third parameter to the Fortran90
            h5pset(get)_cache_f subroutine (INTEGER to INTEGER(SIZE_T)) 
            EIP - 2003/10/13
        - Fixed problems with accessing variable-length data datatypes on
            Crays.  QAK - 2003/10/10
        - Fixed potential file corruption bug when too many object header
            messages (probably attributes, from a user perspective) were
            inserted into an object header and certain other conditions were
            met.  QAK - 2003/10/08
        - Changed implementation of internal ID searching algorithm to avoid
            O(n) behavior for many common cases.  QAK - 2003/10/06
        - Allow partial parallel writing to compact datasets.  QAK - 2003/10/06
        - Correctly create reference to shared datatype in attribute, instead
            of making a copy of the shared datatype in the attribute.
            QAK - 2003/10/01
        - Revert changes which caused files >2GB to fail when created with
            MPI-I/O file driver on certain platforms.  QAK - 2003/09/16
        - Allow compound datatypes to grow in size.  SLU - 2003/09/10
        - Detect if a type is already packed before attempting to pack it
            again or check if it is locked.  SLU - 2003/09/10
        - Corrected bug when opening a file twice with read-only permission
            for one open and then closing the read-only access file ID would
            generate an error.  QAK - 2003/09/10
        - Corrected bug in repeated calls to H5Pget_access_plist() which would
            incorrectly manage reference counts of internal information and
            eventually blow up.  QAK - 2003/09/02
        - Return rank of the array datatype on successful call to
            H5Tget_array_dims().  QAK - 2003/08/30
        - Corrected bug in H5Tdetect_class which was not correctly detecting
            datatype classes of fields in nested compound datatypes in some
            circumstances.  QAK - 2003/08/30
        - Corrected bug in sieve buffer code which could cause loss of data
            when a small dataset was created and deleted in quick succession.
            QAK - 2003/08/27
        - Corrected bug in H5Gget_objname_by_idx which was not allowing NULL
            for the name when just querying for the object name's length.
            QAK - 2003/08/25
        - Corrected bug in variable-length string handling which could
            generate a core dump on writing variable-length strings as part
            of a compound datatype on certain architectures.  QAK - 2003/08/25
        - Corrected bug in H5Tget_native_type which would incorrectly compute
            the size of certain compound datatypes and also incorrectly
            compute the offset of the last field for those compound datatypes.
            QAK - 2003/08/25
        - Corrected bug in H5Tget_native_type which would drop string datatype
            metadata (padding, etc.)  QAK - 2003/08/25
        - Corrected bugs in H5Gget_num_objs, H5Gget_objname_by_idx and
            H5Gget_objtype_by_idx to allow them to accept location IDs, not just
            group IDs.  QAK - 2003/08/21
        - Corrected bug when using scalar dataspace for memory selection and
            operating on chunked dataset.  QAK - 2003/08/18
        - Corrected bugs with multiple '/' characters in names for H5Glink
            and H5Gunlink.  QAK - 2003/08/16
        - Corrected bug with user blocks that didn't allow a user block to
            be inserted in front of a file after the file was created.
            QAK - 2003/08/13
        - Corrected errors with using point selections to access data in
            chunked datasets.  QAK - 2003/07/23
        - Corrected error with variable-length datatypes and chunked datasets
            caused H5Dwrite to fail sometimes.  QAK - 2003/07/19
        - Modified library and file format to support storing indexed storage
            (chunked dataset) B-tree's with non-default internal 'K' values.
            QAK - 2003/07/15
        - Returned H5T_BKG_TEMP support to library after it was accidentally
            removed.  QAK - 2003/07/14

    Configuration
    -------------
        - Parallel I/O with the MPI-I/O driver will no longer work if the
            filesystem is not POSIX compliant.  The "HDF5_MPI_1_METAWRITE"
            environment variable has been removed.  QAK - 2004/01/30
        - Fixed the error that cause "make install" to fail because of the
            macro definition syntax of "prefix?=..."  AKC - 2003/07/22

    Performance
    -------------
        - More optimizations to inner loops of datatype conversions for
            integers and floats which give a 10-50% speedup.  QAK - 2003/11/07
        - Hoisted invariant 'if/else's out of inner datatype conversion loop for
            integer and floating-point values, giving about a 20% speedup.
            QAK - 2003/10/20

    Tools
    -----
        - Fixed h5redeploy which sometimes complain too many argument for the
            test command. (The complain did not hinder the h5redploy to
            proceed correctly.) AKC - 2003/11/03
        - Fixed a segmentation fault of h5diff when percentage option is used.
            AKC - 2003/08/27
        - Switched away from tools using internal "fixtype" function(s) to use
            H5Tget_native_type() internally.  QAK - 2003/08/25

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


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

    AIX 5.1  (32 and 64-bit)      xlc 6.0.0.2
                                  xlf 8.1.0.3
    				  xlC 6.0.0.4
				  xlc 5.0.2.5
				  xlf 7.1.1.2
				  xlC 5.0.2.5
				  mpcc_r 5.0.2.5
				  mpxlf_r 7.1.1.2
                                  poe 3.2.0.10
    Cray T3E sn6606 2.0.6.08      Cray Standard C Version 6.6.0.2
                                  Cray Fortran Version 3.6.0.0.2
                                  mpt 2.2.0.0
    Cray SV1 sn9617 10.0.1.2      Cray Standard C Version 6.6.0.2
                                  mpt 2.2.0.0
                                  Cray Fortran Version 3.6.0.0.2
    Cray T90IEEE 10.0.1.01y       Cray Standard C Version 6.4.0.2.3
                                  Cray Fortran Version 3.4.0.3
                                  mpt 2.1.0.0
    FreeBSD 4.9                   gcc 2.95.4
                                  g++ 2.95.4
    HP-UX B.11.00                 HP C  HP92453-01 A.11.01.20 
                                  HP F90 v2.4
                                  HP ANSI C++ B3910B A.03.13
                                  MPIch 1.2.4
    IRIX 6.5                      MIPSpro cc 7.30
    IRIX64 6.5 (64 & n32)         MIPSpro cc 7.3.1.3m
                                  F90 MIPSpro 7.3.1.3m (64 only)
                                  MPIch 1.2.4
    Linux 2.4.18                  gcc 2.96, 3.2.2, 3.2.3
                                  g++ 3.2.2, 3.2.3
                                  Intel(R) C++ Version 7.1
                                  Intel(R) Fortran Compiler Version 7.1
                                  PGI compilers (pgcc, pgf90, pgCC) version 5.0-2
                                  MPIch 1.2.4
                                  Absoft Fortran v9.0
    OSF1 V5.1                     Compaq C V6.4-014
                                  Compaq C V6.3-027
				  Compaq Fortran V5.5-1877
				  Compaq C++ V6.5-014
				  MPI_64bit_R5
                                  g++ version 3.0 for C++
    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 2 C 5.3
     (Solaris 2.8)                Sun WorkShop 6 update 2 Fortran 90
                                  Sun WorkShop 6 update 2 C++ 5.3
    SunOS 5.8/64                  Sun WorkShop 6 update 2 C 5.3
     (Solaris 2.8)                Sun WorkShop 6 update 2 Fortran 90
                                  Sun WorkShop 6 update 2 C++ 5.3
    TFLOPS r1.0.4 v4.3.3 i386     pgcc Rel 3.1-4i with mpich-1.2.4 with
                                          local modifications
    IA-32 Linux 2.4.9             gcc 2.96
                                  Intel(R) C++ Version 7.0
                                  Intel(R) Fortran Compiler Version 7.0
                                  
    IA-64 Linux 2.4.16 ia64       gcc version 2.96 20000731
                                  Intel(R) C++ Version 7.0
                                  Intel(R) Fortran Compiler Version 7.0
    Windows 2000 (NT5.0)          MSVC++ 6.0
                                  DEC Visual Fortran 6.0
                                  Intel C and F90 compilers version 7.1
				  Code Warrior 8.0
    Windows XP                    MSVC++.NET
    MAC OS X                      Darwin 6.5
                                  gcc and g++ Apple Computer, Inc. GCC 
                                  version 1161, based on gcc version 3.1
                                  IBM XL Fortran compiler version 8.1 
                                  Absoft Fortran v8.2
                                  


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
          dna = does not apply
          ( ) = footnote appears below second table

Platform              C   C         F90      F90       C++  Shared        zlib
                          parallel           parallel       libraries (4)
Solaris2.7 64-bit     y   y (1)     y        y (1)     y    y             y
Solaris2.7 32-bit     y   y (1)     y        y (1)     y    y             y
Solaris2.8 64-bit     y   y (1)     y        y (1)     y    y             y
Solaris2.8 32-bit     y   y         y        y (1)     y    y             y
IRIX6.5               y   y (1)     n        n         n    y             y 
IRIX64_6.5 64-bit     y   y (2)     y        y         y    y             y
IRIX64_6.5 32-bit     y   y (2)     n        n         n    y             y
HPUX11.00             y   y (1)     y        y         y    y             y
OSF1 v5.1             y   y         y        y         y    y             y
T3E                   y   y (5)     y        y (5)     n    n             y
SV1                   y   y (5)     y        y (5)     n    n             y
T90 IEEE              y   y (5)     y        y (5)     n    n             y
TFLOPS                n   y (1)     n        n         n    n             y
AIX-5.1 32-bit        y   y         y        y         y    n             y
AIX-5.1 64-bit        y   y         y        y         y    n             y
WinXP           (6)   y   n         n        n         y    y             y
WinXP Intel           y   n         n        n         y    y             y
Win2000               y   n         y        n         y    y             y
Win2000 Intel         y   n         y        n         y    y             y
WinNT CW              y   n         n        n         n    n             y
Mac OS X 10.2         y   n         n        n         y    y             y
FreeBSD               y   y (1)     n        n         y    y             y
Linux 2.4 gcc   (3)   y   y (1)     y (PGI)  n         y    y             y
Linux 2.4 Intel (3)   y   n         y        n         y    n             y
Linux 2.4 PGI   (3)   y   n         y        n         y    n             y
Linux 2.4 IA32 Intel  y   n         y        n         y    n             y
Linux 2.4 IA64 Intel  y   n         y        n         y    n             y


ASCII Table 2 -- for RELEASE.txt

Platform              static- Thread- SZIP GASS STREAM-  High-level  H4/H5 
                      exec    safe              VFD      APIs        tools (7)
Solaris2.7 64-bit     x       y       y    n    y        y           n
Solaris2.7 32-bit     x       y       y    n    y        y           y
Solaris2.8 64-bit     x       y       y    n    y        y           n
Solaris2.8 32-bit     x       y       y    n    y        y           y
IRIX6.5               x       n       y    n    y        y           y
IRIX64_6.5 64-bit     x       y       y    y    y        y           y
IRIX64_6.5 32-bit     x       y       y    y    y        y           y
HPUX11.00             x       n       y    n    y        y           y
OSF1 v5.1             y       n       y    n    y        y           y
T3E                   y       n       n    n    y        y           y
SV1                   y       n       n    n    y        y           y
T90 IEEE              y       n       n    n    y        y           n
TFLOPS                y       n       n    n    n        n           n
AIX-5.1 32-bit        y       n       y    n    y        y           y
AIX-5.1 64-bit        y       n       y    n    y        y           y
WinXP           (6)   y       n       y    n    n        y           y
WinXP Intel           y       n       y    n    n        y           y
Win2000               y       n       y    n    n        y           y
Win2000 Intel         y       n       y    n    n        y           y
WinNT CW              y       n       y    n    n        y           y
Mac OS X 10.2         y       n       y    n    y        y           n
FreeBSD               y       y       y    n    y        y           y
Linux 2.4 gcc   (3)   y       y       y    n    y        y           y
Linux 2.4 Intel (3)   y       n       y    n    y        n           n
Linux 2.4 PGI   (3)   y       n       y    n    y        n           n
Linux 2.4 IA32 Intel  y       n       y    n    y        y           y
Linux 2.4 IA64 Intel  y       n       y    n    y        y           y

    Notes: (1) Using mpich 1.2.4.
           (2) Using mpt and mpich 1.2.4.
           (3) Linux 2.4 with GNU, Intel, and PGI compilers, respectively.
           (4) Shared libraries are provided only for the C library, except 
               on Windows where they are provided for C and C++.
           (5) Using mpt.
           (6) Binaries only; source code for this platform is not being 
               released at this time.
           (7) Includes the H4toH5 Library and the h4toh5 and h5toh4 
               utilities.
    Compiler versions for each platform are listed in the preceding
    "Platforms Tested" table.



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

* PGI C++ compiler fails when compiling the C++ library's tests.
  Therefore, we cannot verify that the C++ library built with the PGI C++
  compiler is correct.

* The h5dump tests may fail to match the expected output on some platforms
  (e.g. parallel jobs, 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 stream-vfd test uses ip port 10007 for testing. If another
  application is already using that port address, the test will hang
  indefinitely and has to be terminated by the kill command. To try the
  test again, change the port address in test/stream_test.c to one not
  being used in the host.

* The --enable-static-exec configure flag fails to compile for Solaris
  platforms. This is due to the fact that not all of the system
  libraries on Solaris are available in a static format.

  The --enable-static-exec configure flag also fails to correctly compile
  on IBM SP2 platform for the serial mode. The parallel mode works fine
  with this option.
  
  It is suggested that you don't use this option on these platforms
  during configuration.

* With the gcc 2.95.2 compiler, HDF 5 uses the `-ansi' flag during
  compilation. The ANSI version of the compiler complains about not being
  able to handle the `long long' datatype with the warning:

        warning: ANSI C does not support `long long'
  
  This warning is innocuous and can be safely ignored.


* The Stream VFD was not tested yet under Windows. It is not supported
  in the TFLOPS machine.


* The ./dsets tests failed in the TFLOPS machine if the test program,
  dsets.c, is compiled with the -O option.  The hdf5 library still works
  correctly with the -O option.  The test program works fine if it is
  compiled with -O1 or -O0.  Only -O (same as -O2) causes the test
  program to fail.

* Certain platforms give false negatives when testing h5ls:
    - Cray J90 and Cray T90IEEE give errors during testing when displaying
      some floating-point values. These are benign differences due to
      the different precision in the values displayed and h5ls appears to
      be dumping floating-point numbers correctly.

* Before building HDF5 F90 Library from source on Crays 
  replace H5Aff.f90, H5Dff.f90 and H5Pff.f90 files in the fortran/src
  subdirectory in the top level directory with the Cray-specific files
  from the site:
ftp://hdf.ncsa.uiuc.edu/pub/outgoing/hdf5/hdf5-1.6.2/F90_source_for_Crays

* On some platforms that use Intel and Absoft compilers to build HDF5 fortran library,
  compilation may fail for fortranlib_test.f90, fflush1.f90 and fflush2.f90
  complaining about exit subroutine. Comment out the line 
  IF (total_error .ne. 0) CALL exit (total_error)

* On IA32 and IA64 systems, if you use a compiler other than GCC (such as
  Intel's ecc or icc compilers), you will need to modify the generated
  "libtool" program after configuration is finished. On or around line 104 of
  the libtool file, there are lines which look like:

      # How to pass a linker flag through the compiler.
      wl=""

  change these lines to this:

      # How to pass a linker flag through the compiler.
      wl="-Wl,"

  UPDATE: This is now done automatically by the configure script. However, if
  you still experience a problem, you may want to check this line in the
  libtool file and make sure that it has the correct value.

* Information about building with PGI and Intel compilers is available in
  INSTALL file sections 5.7 and 5.8