HDF5 version 1.8.12 released on 2013-11-21
================================================================================

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

This document describes the differences between HDF5-1.8.11 and 
HDF5-1.8.12, and contains information on the platforms tested and 
known problems in HDF5-1.8.12. 
For more details, see the files HISTORY-1_0-1_8_0_rc3.txt 
and HISTORY-1_8.txt in the release_docs/ directory of the HDF5 source.

Links to the HDF5 1.8.12 source code, documentation, and additional materials
can be found on the HDF5 web page at:

     http://www.hdfgroup.org/products/hdf5/

The HDF5 1.8.12 release can be obtained from:

     http://www.hdfgroup.org/HDF5/release/obtain5.html

User documentation for 1.8.12 can be accessed directly at this location: 

     http://www.hdfgroup.org/HDF5/doc/

New features in the HDF5-1.8.x release series, including brief general 
descriptions of some new and modified APIs, are described in the "What's New 
in 1.8.0?" document:

     http://www.hdfgroup.org/HDF5/doc/ADGuide/WhatsNew180.html

All new and modified APIs are listed in detail in the "HDF5 Software Changes 
from Release to Release" document, in the section "Release 1.8.12 (current 
release) versus Release 1.8.11":

     http://www.hdfgroup.org/HDF5/doc/ADGuide/Changes.html

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, Languages, and Compilers
- Bug Fixes since HDF5-1.8.11
- Supported Platforms
- Supported Configuration Features Summary
- More Tested Platforms
- Known Problems


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

    Configuration
    -------------
    - Added a configuration option to change the default plugin path.
      The configure option is --with-default-plugindir=location.
      The cmake option is -DH5_DEFAULT_PLUGINDIR:PATH=location.
      HDFFV-8513.  (ADB 2013/09/04)
    - Renamed FFLAGS to FCFLAGS in configure. (ADB 2013/08/13)
    - CMake can now package a compressed examples file, the default for 
      Windows binaries from HDF Group.  (ADB  - 2013/07/22)
    
    Library
    -------
    - None
 
    Parallel Library
    ----------------
    - None
 
    Tools
    -----
    - h5repack: Added the ability to use plugin filters to read and write 
              files. The option uses the filter number. HDFFV-8345 
              (ADB - 2013/09/04).
    - h5dump: Added the option -N --any_path, which searches the file for 
              paths that match the search path. HDFFV-7989 (ADB - 2013/08/12).
    - h5dump: Added the optional arg 0 to -A, which excludes attributes 
              from display. HDFFV-8134 (ADB - 2013/08/01).

    High-Level APIs
    ---------------
    - None

    Fortran API
    -----------
    - None

    C++ API
    -------
    - Added tutorial examples to C++/examples.  They can be installed by
      "make install-examples" and, in the installed directory, they can be
      executed by running the script file run-c++-ex.sh. (BMR - 2013/09/28)
    - A new class, H5::H5Location, is added to represent the location concept
      in the C library.  It is a base class to H5::H5File and H5::H5Ojbect,
      whose member functions are moved into H5::H5Location.  H5::H5File can
      now inherent those functions.  As a result, an H5::H5File object can have
      an attribute. (BMR - 2013/09/27)
    - Added wrappers for H5Rget_obj_type2 to retrieve the type of the object
      that an object reference points to. (BMR - 2013/09/27)
	H5O_type_t H5Location::getRefObjType(void *ref, H5R_type_t ref_type)
    - Added wrappers for H5Aexist to check whether an attribute exists given
      a name. (BMR - 2013/09/27)
	bool H5::H5Location::attrExists(const char* name)
	bool H5::H5Location::attrExists(const H5std_string& name)
    - Added a number of overloaded functions for convenience. (BMR - 2013/09/27)


Support for New Platforms, Languages, and Compilers
===================================================
    - None

Bug Fixes since HDF5-1.8.11
===========================

    Configuration
    -------------
    - Modified H5detect.c to scan floating point types for padding bits before
      analyzing the type further.  This should fix problems with gcc 4.8. 
      (NAF - 2013/09/19 - HDFFV-8523/HDFFV-8500)
    - HDF5 rpaths are no longer encoded in the library files when configured
      with --disable-sharedlib-rpath. (LRK-2013-09-23 - HDFFV-8276)

    CMake
    -----
    - Fix installation problem for Mac OS X reported on FORUM.
      (ADB - 2013/11/20)
 
    Library
    -------
    - Added const qualifier to source buffer parameters in H5Dgather and
      H5D_scatter_func_t (H5Dscatter callback).  (NAF - 2013/7/09)

    - CMake now creates *.so.{lt_version} files with the same version as 
      configure.  (ADB  - 2013/06/05 HDFFV-8437)

    Parallel Library
    ----------------
    - None

    Performance
    -------------
    - None

    Tools
    -----
    - h5dump: Added the option -N --any_path, which searches the file for 
              paths that match the search path. HDFFV-7989 (ADB - 2013/08/12).
    - h5dump: Added the optional arg 0 to -A, which excludes attributes 
              from display. HDFFV-8134 (ADB - 2013/08/01).
    - h5dump correctly exports subsetted data to a file, using the --output
      option.  (ADB  - 2013/06/07 HDFFV-8447)
    - h5cc and other compile scripts now default to linking shared libraries
      when HDF5 is configured with the --disable-static option.  
      (LRK - 2013-09-23 - HDFFV-8141)

    F90 API
    -------
    - None

    C++ API
    ------
    - None

    High-Level APIs:
    ------
    - None

    Fortran High-Level APIs:
    ------
    - None

    Testing
    -------
    - test/big sometimes failed with the message of "file selection+offset not
      within extent". This has been fixed. (AKC - 2013/09/28 HDFFV-8271).
    - tools/h5diff/testh5diff.sh is run in every "make check", even after it
      has passed in the previous run. It should not run again if there are no
      code changes. Fixed. (AKC - 2013/07/19 HDFFV-8392)

Supported Platforms
===================
The following platforms are supported and have been tested for this release.
They are built with the configure process unless specified otherwise.

    AIX 5.3                       xlc 10.1.0.5
    (NASA G-ADA)                  xlC 10.1.0.5
                                  xlf90 12.1.0.6

    Linux 2.6.18-308.13.1.el5PAE  GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP i686 i686 i386         compilers for 32-bit applications;
    (jam)                             Version 4.1.2 20080704 (Red Hat 4.1.2-54)
                                      Version 4.8.1
                                  PGI C, Fortran, C++ Compilers for 32-bit
                                  applications;
                                      Version 13.7-0
                                  Intel(R) C, C++, Fortran Compiler for 32-bit
                                  applications;
                                      Version 13.1.3 (Build 20130607)

    Linux 2.6.18-308.16.1.el5     GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux       compilers for 64-bit applications;
    (koala)                           Version 4.1.2 20080704 (Red Hat 4.1.2-54)
                                      Version 4.8.1
                                  PGI C, Fortran, C++ for 64-bit target on 
                                  x86-64;
                                      Version 13.7-0 
                                  Intel(R) C, C++, Fortran Compilers for 
                                  applications running on Intel(R) 64; 
                                      Version 13.1.3 (Build 20130607)

    Linux 2.6.32-358.18.1.el6      GNU C (gcc), Fortran (gfortran), C++ (g++)
    #1 SMP x86_64 GNU/Linux       compilers:
    (platypus)                       Version 4.4.7 20120313
                                     Version 4.8.1
                                  PGI C, Fortran, C++ for 64-bit target on 
                                  x86-64;
                                      Version 13.7-0 
                                  Intel(R) C (icc), C++ (icpc), Fortran (icc)
                                  compilers:
                                     Version 13.1.3 (Build 20130607)

    Linux 2.6.32-358.18.1.el6.ppc64 gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3)
    #1 SMP ppc64 GNU/Linux        g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3)
    (ostrich)                     GNU Fortran (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3)
                                  IBM XL C/C++ V11.1
                                  IBM XL Fortran V13.1

    SunOS 5.11 32- and 64-bit     Sun C 5.12 SunOS_sparc
    (emu)                         Sun Fortran 95 8.6 SunOS_sparc
                                  Sun C++ 5.12 SunOS_sparc

    Windows 7                     Visual Studio 2008 w/ Intel Fortran 11 (cmake)
                                  Visual Studio 2010 w/ Intel Fortran 12 (cmake)
                                  Visual Studio 2012 w/ Intel Fortran 13 (cmake)
                                  Cygwin(CYGWIN_NT-6.1 1.7.15(0.260/5/3) gcc(4.5.3) compiler and gfortran)
                                  (cmake and autotools)

    Windows 7 x64                 Visual Studio 2008 w/ Intel Fortran 11 (cmake)
                                  Visual Studio 2010 w/ Intel Fortran 12 (cmake)
                                  Visual Studio 2012 w/ Intel Fortran 13 (cmake)

    Windows 8.1                   Visual Studio 2012 w/ Intel Fortran 13 (cmake)

    Windows 8.1 x64               Visual Studio 2012 w/ Intel Fortran 13 (cmake)

    Mac OS X Snow Leopard 10.6.8  gcc i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 from Xcode 3.2.6
    Darwin Kernel Version 10.8.0  g++ i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 from Xcode 3.2.6
    64-bit                        gfortran GNU Fortran (GCC) 4.6.2
    (fred)                        Intel C (icc), Fortran (ifort), C++ (icpc)
                                      12.1 Build 20120928

    Mac OS X Lion 10.7.3          Apple clang/clang++ version 3.0 from Xcode 4.6.1
    64-bit                        gfortran GNU Fortran (GCC) 4.6.2
    (duck)                        Intel icc/icpc/ifort version 13.0.3

    Mac OS X Mountain Lion 10.8.1 Apple clang/clang++ version 4.2 from Xcode 4.6.1
    64-bit                        gfortran GNU Fortran (GCC) 4.6.2
    (wren)                        Intel icc/icpc/ifort version 13.0.3

    OpenVMS  IA64 V8.4            HP C V7.3-018         
                                  HP Fortran V8.2-104939-50H96
                                  HP C++ V7.4-004 

Tested Configuration Features Summary
=====================================

    In the tables below
          y   = tested 
          n   = not tested in this release
          C   = Cluster
          W   = Workstation
          x   = not working in this release
          dna = does not apply
          ( ) = footnote appears below second table
          <blank> = testing incomplete on this feature or platform 

Platform                              C         F90/   F90      C++  zlib  SZIP
                                      parallel  F2003  parallel
Solaris2.11 32-bit                      n        y/y    n        y    y     y
Solaris2.11 64-bit                      n        y/y    n        y    y     y
Windows 7                               y        y/y    n        y    y     y
Windows 7 x64                           y        y/y    n        y    y     y
Windows 7 Cygwin                        n        y/n    n        y    y     y
Windows 8.1                             n        y/y    n        y    y     y
Windows 8.1   x64                       n        y/y    n        y    y     y
Mac OS X Snow Leopard 10.6.8 64-bit     n        y/y    n        y    y     y
Mac OS X Lion 10.7.3 64-bit             n        y/y    n        y    y     y
Mac OS X Mountain Lion 10.8.1 64-bit    n        y/y    n        y    y     y
AIX 5.3 32- and 64-bit                  n        y/n    n        y    y     y
CentOS 5.9 Linux 2.6.18-308 i686 GNU    y        y/y    y        y    y     y
CentOS 5.9 Linux 2.6.18-308 i686 Intel  n        y/y    n        y    y     y
CentOS 5.9 Linux 2.6.18-308 i686 PGI    n        y/y    n        y    y     y
CentOS 5.9 Linux 2.6.18 x86_64 GNU      y        y/y    y        y    y     y
CentOS 5.9 Linux 2.6.18 x86_64 Intel    n        y/y    n        y    y     y
CentOS 5.9 Linux 2.6.18 x86_64 PGI      n        y/y    n        y    y     y
CentOS 6.4 Linux 2.6.32 x86_64 GNU      n        y/y    n        y    y     y
CentOS 6.4 Linux 2.6.32 x86_64 Intel    n        y/y    n        y    y     y
Linux 2.6.32-358.2.1.el6.ppc64          n        y/n    n        y    y     y
OpenVMS IA64 V8.4                       n        y/n    n        y    y     n

Platform                                 Shared  Shared    Shared    Thread-  
                                         C libs  F90 libs  C++ libs  safe     
Solaris2.11 32-bit                         y       y         y         y        
Solaris2.11 64-bit                         y       y         y         y        
Windows 7                                  y       y         y         y
Windows 7 x64                              y       y         y         y
Windows 7 Cygwin                           n       n         n         y
Windows 8.1                                y       y         y         y
Windows 8.1 x64                            y       y         y         y
Mac OS X Snow Leopard 10.6.8 64-bit        y       n         y         n        
Mac OS X Lion 10.7.3 64-bit                y       n         y         y        
Mac OS X Mountain Lion 10.8.1 64-bit       y       n         y         y        
AIX 5.3 32- and 64-bit                     y       n         n         y        
CentOS 5.9 Linux 2.6.18-308 i686 GNU       y       y         y         y        
CentOS 5.9 Linux 2.6.18-308 i686 Intel     y       y         y         n        
CentOS 5.9 Linux 2.6.18-308 i686 PGI       y       y         y         n        
CentOS 5.9 Linux 2.6.18 x86_64 GNU         y       y         y         y        
CentOS 5.9 Linux 2.6.18 x86_64 Intel       y       y         y         n        
CentOS 5.9 Linux 2.6.18 x86_64 PGI         y       y         y         n     
CentOS 6.4 Linux 2.6.32 x86_64 GNU         y       y         y         n
CentOS 6.4 Linux 2.6.32 x86_64 Intel       y       y         y         n
Linux 2.6.32-358.2.1.el6.ppc64             y       y         y         n 
OpenVMS IA64 V8.4                          n       n         n         n

Compiler versions for each platform are listed in the preceding
"Supported Platforms" table.


More Tested Platforms
=====================
The following platforms are not supported but have been tested for this release.

    Linux 2.6.18-308.13.1.el5PAE  MPICH mpich2-1.4.1p1 compiled with
    #1 SMP i686 i686 i386             gcc 4.1.2 and gfortran 4.1.2
    (jam)                         g95 (GCC 4.0.3 (g95 0.94!)

    Linux 2.6.18-308.16.1.el5     MPICH mpich2-1.4.1p1 compiled with
    #1 SMP x86_64 GNU/Linux           gcc 4.1.2 and gfortran 4.1.2
    (koala)                       g95 (GCC 4.0.3 (g95 0.94!)
                                  
    FreeBSD 8.2-STABLE i386       gcc 4.5.4 [FreeBSD] 20110526
    (loyalty)                     gcc 4.6.1 20110527
                                  g++ 4.6.1 20110527
                                  gfortran 4.6.1 20110527

    FreeBSD 8.2-STABLE amd64      gcc 4.5.4 [FreeBSD] 20110526
    (freedom)                     gcc 4.6.1 20110527
                                  g++ 4.6.1 20110527
                                  gfortran 4.6.1 20110527

    Debian7.1.0 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux
                                  gcc (Debian 4.7.2-5) 4.7.2
                                  GNU Fortran (Debian 4.7.2-5) 4.7.2
                                  (cmake and autotools)

    Fedora19 3.11.1-200.fc19.x86_64 #1 SMP x86_64 x86_64 x86_64 GNU/Linux
                                  gcc (GCC) 4.8.1 20130603 (Red Hat 4.8.1-1)
                                  GNU Fortran (GCC) 4.8.1 20130603 (Red Hat 4.8.1-1)
                                  (cmake and autotools)

    SUSE 12.3 3.7.10-1.16-desktop #1 SMP PREEMPT x86_64 x86_64 x86_64 GNU/Linux
                                  gcc (SUSE Linux) 4.7.2
                                  GNU Fortran (SUSE Linux) 4.7.2 
                                  (cmake and autotools)

    Ubuntu 13.04 3.8.0-30-generic #44-Ubuntu SMP x86_64 GNU/Linux
                                  gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
                                  GNU Fortran (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
                                  (cmake and autotools)
    
    Cray Linux Environment (CLE)  PrgEnv-pgi/4.0.46
    hopper.nersc.gov              pgcc 12.5-0 64-bit target on x86-64 Linux -tp shanghai
                                  pgf90 12.5-0 64-bit target on x86-64 Linux -tp shanghai
                                  pgCC 12.5-0 64-bit target on x86-64 Linux -tp shanghai


Known Problems
==============
* Several HDF5 command-line tools and tests leave behind generated files
  that are not cleaned up with "make clean" or "make distclean" when software
  is built in place. The issue will be addressed in the 1.8.13 release. We
  recommend to use build directory to compile and test HDF5 as described
  in the INSTALL file, section 4.2.
 
* Source directory names with spaces in them will cause failures in configure
  or make on Mac (HDFFV-8152), Linux, and probably all other platforms.  If a 
  configure command with a space is run from a build directory, it will exit 
  with an error message:  "checking whether build environment is sane... 
  configure: error: unsafe srcdir value: '/scr/lrknox/hdf5 v1.8.12'".  If 
  configure is run inside or below the directory with the space in the name, 
  libtool will get the directory path from the system, put the part of the 
  path before the space in the libdir variable in .../src/libhdf5.la, and 
  then fail to find the nonexistent directory.  This is a known libtool issue 
  and the suggested workaround is to rename the directory without spaces. 
  (LRK - 2013/10/22)

* CLANG compiler with the options -fcatch-undefined-behavior and -ftrapv
  catches some undefined behavior in the alignment algorithm of the macro 
  DETECT_I in H5detect.c (HDFFV-8147). This issue will be addressed in the 
  next release.  (SLU - 2013/10/16)

* Running make check for the tools can fail in the tools tests if make was not
  run prior. The tests for the tools use other tools in the tests, therefore
  all the tools should be built before testing the tools. (ADB - 2013/10/09)

* Make provided by Solaris fails in "make check". Solaris users should use
  gmake to build and install HDF5 software. (AKC - 2013/10/08 - HDFFV-8534)

* On OpenVMS, two soft conversion functions (H5T__conv_i_f and H5T__conv_f_i)
  have bugs.  They convert data between floating-point numbers and integers.
  But the library's default is hard conversion.  The user should avoid
  explicitly enabling soft conversion between floating-point numbers and
  integers. (Issue VMS-8; SLU - 2013/09/19)

* On OpenVMS, ZLIB 1.2.8 library doesn't work properly.  ZLIB 1.2.5 works
  fine.  So please use ZLIB 1.2.5 to build HDF5 library. (Issue VMS-5;
  SLU 2013/09/19)  

* When building using the Cray compilers on Cray machines, HDF5
  configure mistakenly thinks the compiler is an intel compiler and
  sets the -std=c99 flag which breaks configure on Cray. To build HDF5
  properly on a Cray machine, please consult with the instructions in
  INSTALL_parallel for building on Hopper.
  (MSC - 2013/04/26 - HDFFV-8429)

* The h5dump and h5diff utilities occasionally produce different output
  between Linux and Windows systems. This is caused by lower-level library
  routines that fail to write fill values to the user's buffer when reading
  unallocated chunks from datasets that have a fill value set to
  H5D_FILL_VALUE_DEFAULT. Due to platform differences the return of
  spurious data values has only been encountered on Windows 32-bit systems.
  (Issue HDFFV-8247; JP - 2013/03/27)

* The 5.9 C++ compiler on Sun failed to compile a C++ test ttypes.cpp.  It 
  complains with this message:
      "/home/hdf5/src/H5Vprivate.h", line 130: Error: __func__ is not defined.
  
  The reason is that __func__ is a predefined identifier in C99 standard.  The
  HDF5 C library uses it in H5private.h.  The test ttypes.cpp includes 
  H5private.h (H5Tpkg.h<-H5Fprivate.h<-H5Vprivate.h<-H5private.h).  Sun's 5.9
  C++ compiler doesn't support __func__, thus fails to compile the C++ test.
  But Sun's 5.11 C++ compiler does.  To check whether your Sun C++ compiler 
  knows this identifier, try to compile the following simple C++ program:
      #include<stdio.h>

      int main(void)
      {
          printf("%s\n", __func__);
          return 0;
      }
  (SLU - 2012/11/5)

* The C++ and FORTRAN bindings are not currently working on FreeBSD with the
  native release 8.2 compilers (4.2.1), but are working with gcc 4.6 from the
  ports (and probably gcc releases after that).
  (QAK - 2012/10/19)

* The following h5dump test case fails in BG/P machines (and potentially other
  machines that use a command script to launch executables):

   h5dump --no-compact-subset -d "AHFINDERDIRECT::ah_centroid_t[0] it=0 tl=0"
     tno-subset.h5
  
  This is due to the embedded spaces in the dataset name being interpreted
  by the command script launcher as meta-characters, thus passing three
  arguments to h5dump's -d flag. The command passes if run by hand, just
  not via the test script.
  (AKC - 2012/05/03)

* On hopper, the build failed when RUNSERIAL and RUNPARALLEL are set
  to aprun -np X, because the H5lib_settings.c file was not generated
  properly. Not setting those environment variables works, because
  configure was able to automatically detect that it is a Cray system
  and used the proper launch commands when necessary. 
  (MSC - 2012/04/18)

* The data conversion test dt_arith.c fails in "long double" to integer
  conversion on Ubuntu 11.10 (3.0.0.13 kernel) with GCC 4.6.1 if the library
  is built with optimization -O3 or -O2.  The older GCC (4.5) or newer kernel
  (3.2.2 on Fedora) do not have the problem.  Users should lower the 
  optimization level (-O1 or -O0) by defining CFLAGS in the command line of 
  "configure" like:

      CFLAGS=-O1 ./configure

  This will overwrite the library's default optimization level.
  (SLU - 2012/02/07 - HDFFV-7829)
  This issue is no longer present on Ubuntu 12.10 (3.5.0 kernel) with 
  gcc 4.7.2.

* The STDIO VFD does not work on some architectures, possibly due to 32/64
  bit or large file issues.  The basic STDIO VFD test is known to fail on
  64-bit SunOS 5.10 on SPARC when built with -m64 and 32-bit OS X/Darwin
  10.7.0.  The STDIO VFD test has been disabled while we investigate and
  a fix should appear in a future release.
  (DER - 2011/10/14 - HDFFV-8235)

* h5diff can report inconsistent results when comparing datasets of enum type
  that contain invalid values.  This is due to how enum types are handled in
  the library and will be addressed in a future release.
  (DER - 2011/10/14 - HDFFV-7527)

* The links test can fail under the stdio VFD due to some issues with external
  links.  This will be investigated and fixed in a future release.
  (DER - 2011/10/14 - HDFFV-7768)

* After the shared library support was fixed for some bugs, it was discovered
  that "make prefix=XXX install" no longer works for shared libraries. It
  still works correctly for static libraries. Therefore, if you want to
  install the HDF5 shared libraries in a location such as /usr/local/hdf5,
  you need to specify the location via the --prefix option during configure 
  time. E.g, ./configure --prefix=/usr/local/hdf5 ...
  (AKC - 2011/05/07 - HDFFV-7583)

* The parallel test, t_shapesame, in testpar/, may run for a long time and may
  be terminated by the alarm signal.  If that happens, one can increase the
  alarm seconds (default is 1200 seconds = 20 minutes) by setting the
  environment variable, $HDF5_ALARM_SECONDS, to a larger value such as 3600
  (60 minutes).  Note that the t_shapesame test may fail in some systems 
  (see the "While working on the 1.8.6 release..." problem below).  If 
  it does, it will waste more time if $HDF5_ALARM_SECONDS is set
  to a larger value.
  (AKC - 2011/05/07)

* The C++ and FORTRAN bindings are not currently working on FreeBSD.
  (QAK - 2011/04/26)

* Shared Fortran libraries are not quite working on AIX. While they are
  generated when --enable-shared is specified, the fortran and hl/fortran
  tests fail. We are looking into the issue. HL and C++ shared libraries
  should now be working as intended, however.
  (MAM - 2011/04/20)

* The --with-mpe configure option does not work with Mpich2.
  (AKC - 2011/03/10)

* While working on the 1.8.6 release of HDF5, a bug was discovered that can
  occur when reading from a dataset in parallel shortly after it has been
  written to collectively. The issue was exposed by a new test in the parallel
  HDF5 test suite, but had existed before that. We believe the problem lies with
  certain MPI implementations and/or file systems.

  We have provided a pure MPI test program, as well as a standalone HDF5
  program, that can be used to determine if this is an issue on your system.
  They should be run across multiple nodes with a varying number of processes.
  These programs can be found at:
  http://www.hdfgroup.org/ftp/HDF5/examples/known_problems/
  (NAF - 2011/01/19)

* All the VFL drivers aren't backward compatible.  In H5FDpublic.h, the
  structure H5FD_class_t changed in 1.8.  There is new parameter added to
  get_eoa and set_eoa callback functions.  A new callback function
  get_type_map was added in.  The public function H5FDrealloc was taken
  out in 1.8.  The problem only happens when users define their own driver
  for 1.6 and try to plug in 1.8 library.  Because there's only one user 
  complaining about it, we (Elena, Quincey, and I) decided to leave it as 
  it is (see bug report #1279).  Quincey will make a plan for 1.10.
  (SLU - 2010/02/02)

* The --enable-static-exec configure flag will only statically link libraries
  if the static version of that library is present. If only the shared version
  of a library exists (i.e., most system libraries on Solaris, AIX, and Mac,
  for example, only have shared versions), the flag should still result in a 
  successful compilation, but note that the installed executables will not be 
  fully static. Thus, the only guarantee on these systems is that the 
  executable is statically linked with just the HDF5 library.
  (MAM - 2009/11/04)
  
* Parallel tests failed with 16 processes with data inconsistency at testphdf5
  / dataset_readAll. Parallel tests also failed with 32 and 64 processes with
  collective abort of all ranks at t_posix_compliant / allwrite_allread_blocks
  with MPI IO.
  (CMC - 2009/04/28)

* On an Intel 64 Linux cluster (RH 4, Linux 2.6.9) with Intel 10.0 compilers, 
  use -mp -O1 compilation flags to build the libraries. A higher level of 
  optimization causes failures in several HDF5 library tests. 

* A dataset created or rewritten with a v1.6.3 library or after cannot be read 
  with the v1.6.2 library or before when the Fletcher32 EDC filter is enabled.
  There was a bug in the calculation of the Fletcher32 checksum in the 
  library before v1.6.3; the checksum value was not consistent between big-
  endian and little-endian systems.  This bug was fixed in Release 1.6.3.  
  However, after fixing the bug, the checksum value was no longer the same as 
  before on little-endian system.  Library releases after 1.6.4 can still read 
  datasets created or rewritten with an HDF5 library of v1.6.2 or before.  
  (SLU - 2005/06/30)
