HDF5 version 1.10.7-1 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 HDF5-1.10.x release series can be found at: https://portal.hdfgroup.org/display/HDF5/HDF5+Application+Developer%27s+Guide 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 HDF5-1.10.5 - Supported Platforms - Tested Configuration Features Summary - More Tested Platforms - Known Problems - CMake vs. Autotools installations New Features ============ Configuration: ------------- - CMake option to use AEC (open source SZip) library instead of SZip The open source AEC library is a replacement library for SZip. In order to use it for hdf5 the libaec CMake source was changed to add "-fPIC" and exclude test files. Autotools does not build the compression libraries within hdf5 builds. New option USE_LIBAEC is required to compensate for the different files produced by AEC build. (ADB - 2020/04/22, OESS-65) - CMake ConfigureChecks.cmake file now uses CHECK_STRUCT_HAS_MEMBER Some handcrafted tests in HDFTests.c has been removed and the CMake CHECK_STRUCT_HAS_MEMBER module has been used. (ADB - 2020/03/24, TRILAB-24) - Both build systems use same set of warnings flags GNU C, C++ and gfortran warnings flags were moved to files in a config sub-folder named gnu-warnings. Flags that only are available for a specific version of the compiler are in files named with that version. Clang C warnings flags were moved to files in a config sub-folder named clang-warnings. Intel C, Fortran warnings flags were moved to files in a config sub-folder named intel-warnings. There are flags in named "error-xxx" files with warnings that may be promoted to errors. Some source files may still need fixes. There are also pairs of files named "developer-xxx" and "no-developer-xxx" that are chosen by the CMake option:HDF5_ENABLE_DEV_WARNINGS or the configure option:--enable-developer-warnings. In addition, CMake no longer applies these warnings for examples. (ADB - 2020/03/24, TRILAB-192) - Update CMake minimum version to 3.12 Updated CMake minimum version to 3.12 and added version checks for Windows features. (ADB - 2020/02/05, TRILABS-142) - Fixed CMake include properties for Fortran libraries Corrected the library properties for Fortran to use the correct path for the Fortran module files. (ADB - 2020/02/04, HDFFV-11012) - Added common warnings files for gnu and intel Added warnings files to use one common set of flags during configure for both autotools and CMake build systems. The initial implementation only affects a general set of flags for gnu and intel compilers. (ADB - 2020/01/17) - Added new options to CMake for control of testing Added CMake options (default ON); HDF5_TEST_SERIAL AND/OR HDF5_TEST_PARALLEL combined with: HDF5_TEST_TOOLS HDF5_TEST_EXAMPLES HDF5_TEST_SWMR HDF5_TEST_FORTRAN HDF5_TEST_CPP HDF5_TEST_JAVA (ADB - 2020/01/15, HDFFV-11001) - Added Clang sanitizers to CMake for analyzer support if compiler is clang. Added CMake code and files to execute the Clang sanitizers if HDF5_ENABLE_SANITIZERS is enabled and the USE_SANITIZER option is set to one of the following: Address Memory MemoryWithOrigins Undefined Thread Leak 'Address;Undefined' (ADB - 2019/12/12, TRILAB-135) - Update CMake for VS2019 support CMake added support for VS2019 in version 3.15. Changes to the CMake generator setting required changes to scripts. Also updated version references in CMake files as necessary. (ADB - 2019/11/18, HDFFV-10962) - Update CMake options to match new autotools options Add configure options (autotools - CMake): enable-asserts HDF5_ENABLE_ASSERTS enable-symbols HDF5_ENABLE_SYMBOLS enable-profiling HDF5_ENABLE_PROFILING enable-optimization HDF5_ENABLE_OPTIMIZATION In addition NDEBUG is no longer forced defined and relies on the CMake process. (ADB - 2019/10/07, HDFFV-100901, HDFFV-10637, TRILAB-97) - Update CMake tests to use FIXTURES CMake test fixtures allow setup/cleanup tests and other dependency requirements as properties for tests. This is more flexible for modern CMake code. (ADB - 2019/07/23, HDFFV-10529) - Windows PDB files are always installed There are build configuration or flag settings for Windows that may not generate PDB files. If those files are not generated then the install utility will fail because those PDB files are not found. An optional variable, DISABLE_PDB_FILES, was added to not install PDB files. (ADB - 2019/07/17, HDFFV-10424) - Add mingw CMake support with a toolchain file There has been a number of mingw issues that has been linked under HDFFV-10845. It has been decided to implement the CMake cross-compiling technique of toolchain files. We will use a linux platform with the mingw compiler stack for testing. Only the C language is fully supported, and the error tests are skipped. The C++ language works for static but shared builds has a shared library issue with the mingw Standard Exception Handling library, which is not available on Windows. Fortran has a common cross-compile problem with the fortran configure tests. (ADB - 2019/07/12, HDFFV-10845, HDFFV-10595) - Windows PDB files are installed incorrectly For static builds, the PDB files for windows should be installed next to the static libraries in the lib folder. Also the debug versions of libraries and PDB files are now correctly built using the default CMAKE_DEBUG_POSTFIX setting. (ADB - 2019/07/09, HDFFV-10581) - Add option to build only shared libs A request was made to prevent building static libraries and only build shared. A new option was added to CMake, ONLY_SHARED_LIBS, which will skip building static libraries. Certain utility functions will build with static libs but are not published. Tests are adjusted to use the correct libraries depending on SHARED/STATIC settings. (ADB - 2019/06/12, HDFFV-10805) - Add options to enable or disable building tools and tests Configure options --enable-tests and --enable-tools were added for autotools configure. These options are enabled by default, and can be disabled with either --disable-tests (or tools) or --enable-tests=no (or --enable-tools=no). Build time is reduced ~20% when tools are disabled, 35% when tests are disabled, 45% when both are disabled. Reenabling them after the initial build requires running configure again with the option(s) enabled. (LRK - 2019/06/12, HDFFV-9976) - Change tools test that test the error stack There are some use cases which can cause the error stack of tools to be different then the expected output. These tests now use grepTest.cmake, this was changed to allow the error file to be searched for an expected string. (ADB - 2019/04/15, HDFFV-10741) Library: -------- - Add S3 and HDFS VFDs to HDF5 maintenance Fix windows requirements and java tests. Windows requires CMake 3.13. Install openssl library (with dev files); from "Shining Light Productions". msi package preferred. PATH should have been updated with the installation dir. set ENV variable OPENSSL_ROOT_DIR to the installation dir. set ENV variable OPENSSL_CONF to the cfg file, likely %OPENSSL_ROOT_DIR%\bin\openssl.cfg Install libcurl library (with dev files); download the latest released version using git: https://github.com/curl/curl.git Open a Visual Studio Command prompt change to the libcurl root folder run the "buildconf.bat" batch file change to the winbuild directory nmake /f Makefile.vc mode=dll MACHINE=x64 copy libcurl-vc-x64-release-dll-ipv6-sspi-winssl dir to C:\curl (installation dir) set ENV variable CURL_ROOT to C:\curl (installation dir) update PATH ENV variable to %CURL_ROOT%\bin (installation bin dir). the aws credentials file should be in %USERPROFILE%\.aws folder set the ENV variable "HDF5_ROS3_TEST_BUCKET_URL=https://s3.us-east-2.amazonaws.com/hdf5ros3" (ADB - 2019/09/12, HDFFV-10854) - Fixed an assertion failure in the parallel library when collectively filling chunks. As it is required that chunks be written in monotonically non-decreasing order of offset in the file, this assertion was being triggered when the list of chunk file space allocations being passed to the collective chunk filling routine was not sorted according to this particular requirement. The addition of a sort of the out of order chunks trades a bit of performance for the elimination of this assertion and of any complaints from MPI implementations about the file offsets used being out of order. (JTH - 2019/10/07) Parallel Library: ----------------- - C++ Library: ------------ - Added new wrappers for H5Pset/get_create_intermediate_group() LinkCreatPropList::setCreateIntermediateGroup() LinkCreatPropList::getCreateIntermediateGroup() (BMR - 2019/04/22, HDFFV-10622) Java Library: ---------------- - Fix a failure in JUnit-TestH5P on 32-bit architectures (JTH - 2019/04/30) Tools: ------ - High-Level APIs: --------------- - C Packet Table API ------------------ - Internal header file -------------------- - Documentation ------------- - Support for new platforms, languages and compilers. ======================================= - Bug Fixes since HDF5-1.10.5 release ================================== Library ------- - Improved peformance when creating a large number of small datasets by retrieving default property values from the API context instead of doing skip list searches. (CJH - 2019/12/10, HDFFV-10658) - Fixed user-created data access properties not existing in the property list returned by H5Dget_access_plist. Thanks to Steven Varga for submitting a reproducer and a patch. (CJH - 2019/12/9, HDFFV-10934) - Fixed a bug caused by bad tag value when condensing object header messages There was an assertion failure when moving meessages from running a user test program with library release hdf5.1.10.4. It was because the tag value (object header's address) was not set up when entering the library routine H5O__chunk_update_idx(), which will eventually verifies the metadata tag value when protecting the object header. The problem was fixed by replacing FUNC_ENTER_PACKAGE in H5O__chunk_update_idx() with FUNC_ENTER_PACKAGE_TAG(oh->cache_info.addr) to set up the metadata tag. (VC - 2019/08/23, HDFFV-10873) - Fixed the test failure from test_metadata_read_retry_info() in test/swmr.c The test failure is due to the incorrect number of bins returned for retry info (info.nbins). The # of bins expected for 101 read attempts is 3 instead of 2. The routine H5F_set_retries() in src/H5Fint.c calculates the # of bins by first obtaining the log10 value for (read attempts - 1). For PGI/19, the log10 value for 100 read attempts is 1.9999999999999998 instead of 2.00000. When casting the log10 value to unsigned later on, the decimal part is chopped off causing the test failure. This was fixed by obtaining the rounded integer value (HDceil) for the log10 value of read attempts first before casting the result to unsigned. (VC - 2019/8/14, HDFFV-10813) - Fixed an issue where creating a file with non-default file space info together with library high bound setting to H5F_LIBVER_V18. When setting non-default file space info in fcpl via H5Pset_file_space_strategy() and then creating a file with both high and low library bounds set to H5F_LIBVER_V18 in fapl, the library succeeds in creating the file. File creation should fail because the feature of setting non-default file space info does not exist in library release 1.8 or earlier. This was fixed by setting and checking the proper version in the file space info message based on the library low and high bounds when creating and opening the HDF5 file. (VC - 2019/6/25, HDFFV-10808) - Fixed an issue where copying a version 1.8 dataset between files using H5Ocopy fails due to an incompatible fill version When using the HDF5 1.10.x H5Ocopy() API call to copy a version 1.8 dataset to a file created with both high and low library bounds set to H5F_LIBVER_V18, the H5Ocopy() call will fail with the error stack indicating that the fill value version is out of bounds. This was fixed by changing the fill value message version to H5O_FILL_VERSION_3 (from H5O_FILL_VERSION_2) for H5F_LIBVER_V18. (VC - 2019/6/14, HDFFV-10800) - Fixed a bug that would cause an error or cause fill values to be incorrectly read from a chunked dataset using the "single chunk" index if the data was held in cache and there was no data on disk. (NAF - 2019/03/06) - Fixed a bug that could cause an error or cause fill values to be incorrectly read from a dataset that was written to using H5Dwrite_chunk if the dataset was not closed after writing. (NAF - 2019/03/06, HDFFV-10716) - Fixed memory leak in scale offset filter In a special case where the MinBits is the same as the number of bits in the datatype's precision, the filter's data buffer was not freed, causing the memory usage to grow. In general the buffer was freed correctly. The Minbits are the minimal number of bits to store the data values. Please see the reference manual for H5Pset_scaleoffset for the detail. (RL - 2019/3/4, HDFFV-10705) - fcntl(2)-based file locking incorrectly passed the lock argument struct instead of a pointer to the struct, causing errors on systems where flock(2) is not available. File locking is used when files are opened to enforce SWMR semantics. A lock operation takes place on all file opens unless the HDF5_USE_FILE_LOCKING environment variable is set to the string "FALSE". flock(2) is preferentially used, with fcntl(2) locks as a backup if flock(2) is unavailable on a system (if neither is available, the lock operation fails). On these systems, the file lock will often fail, which causes HDF5 to not open the file and report an error. This bug only affects POSIX systems. Win32 builds on Windows use a no-op locking call which always succeeds. Systems which exhibit this bug will have H5_HAVE_FCNTL defined but not H5_HAVE_FLOCK in the configure output. This bug affects HDF5 1.10.0 through 1.10.5. fcntl(2)-based file locking now correctly passes the struct pointer. (DER - 2019/08/27, HDFFV-10892) - Inappropriate linking with deprecated MPI C++ libraries HDF5 does not define *_SKIP_MPICXX in the public headers, so applications can inadvertently wind up linking to the deprecated MPI C++ wrappers. MPICH_SKIP_MPICXX and OMPI_SKIP_MPICXX have both been defined in H5public.h so this should no longer be an issue. HDF5 makes no use of the deprecated MPI C++ wrappers. (DER - 2019/09/17, HDFFV-10893) - Don't allocate an empty (0-dimensioned) chunked dataset's chunk index, until the dataset's dimensions are increased. (QAK - 2020/05/07) Java Library: ---------------- - Configuration ------------- - Fixed CMake include properties for Fortran libraries Corrected the library properties for Fortran to use the correct path for the Fortran module files. (ADB - 2020/02/04, HDFFV-11012) - Correct option for default API version CMake options for default API version are not mutually exclusive. Change the multiple BOOL options to a single STRING option with the strings; v16, v18, v110. (ADB - 2019/08/12, HDFFV-10879) Performance ------------- - Fortran -------- - Corrected INTERFACE INTENT(IN) to INTENT(OUT) for buf_size in h5fget_file_image_f. (MSB - 2020/2/18, HDFFV-11029) - Fixed configure issue when building HDF5 with NAG Fortran 7.0. HDF5 now accounts for the addition of half-precision floating-point in NAG 7.0 with a KIND=16. (MSB - 2020/02/28, HDFFV-11033) Tools ----- - h5repack was fixed to repack the reference attributes properly. The code line that checks if the update of reference inside a compound datatype is misplaced outside the code block loop that carries out the check. In consequence, the next attribute that is not the reference type was repacked again as the reference type and caused the failure of repacking. The fix is to move the corresponding code line to the correct code block. (KY -2020/02/10, HDFFV-11014) - h5repack was fixed to repack datasets with external storage to other types of storage. New test added to repack files and verify the correct data using h5diff. (JS - 2019/09/25, HDFFV-10408) (ADB - 2019/10/02, HDFFV-10918) High-Level APIs: ------ - Fortran High-Level APIs: ------ - Documentation ------------- - F90 APIs -------- - C++ APIs -------- - Testing ------- - Stopped java/test/junit.sh.in installing libs for testing under ${prefix} Lib files needed are now copied to a subdirectory in the java/test directory, and on Macs the loader path for libhdf5.xxxs.so is changed in the temporary copy of libhdf5_java.dylib. (LRK, 2020/7/2, HDFFV-11063) Supported Platforms =================== Linux 2.6.32-696.16.1.el6.ppc64 gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18) #1 SMP ppc64 GNU/Linux g++ (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18) (ostrich) GNU Fortran (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18) IBM XL C/C++ V13.1 IBM XL Fortran V15.1 Linux 3.10.0-327.10.1.el7 GNU C (gcc), Fortran (gfortran), C++ (g++) #1 SMP x86_64 GNU/Linux compilers: (kituo/moohan) Version 4.8.5 20150623 (Red Hat 4.8.5-4) Version 4.9.3, Version 5.2.0 Intel(R) C (icc), C++ (icpc), Fortran (icc) compilers: Version 17.0.0.098 Build 20160721 MPICH 3.1.4 compiled with GCC 4.9.3 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 x64 Visual Studio 2015 w/ Intel C, Fortran 2018 (cmake) Visual Studio 2015 w/ MSMPI 10 (cmake) Windows 10 x64 Visual Studio 2015 w/ Intel Fortran 18 (cmake) Visual Studio 2017 w/ Intel Fortran 19 (cmake) Visual Studio 2019 w/ Intel Fortran 19 (cmake) Mac OS X Yosemite 10.10.5 Apple clang/clang++ version 6.1 from Xcode 7.0 64-bit gfortran GNU Fortran (GCC) 4.9.2 (osx1010dev/osx1010test) Intel icc/icpc/ifort version 15.0.3 Mac OS X El Capitan 10.11.6 Apple clang/clang++ version 7.3.0 from Xcode 7.3 64-bit gfortran GNU Fortran (GCC) 5.2.0 (osx1011dev/osx1011test) Intel icc/icpc/ifort version 16.0.2 Mac OS Sierra 10.12.6 Apple LLVM version 8.1.0 (clang/clang++-802.0.42) 64-bit gfortran GNU Fortran (GCC) 7.1.0 (swallow/kite) Intel icc/icpc/ifort version 17.0.2 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 = 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/n n y y y Windows 7 y y/y n y y y Windows 7 x64 y y/y y y y y Windows 7 Cygwin n y/n n y y y Windows 7 x64 Cygwin n y/n n y y y Windows 10 y y/y n y y y Windows 10 x64 y y/y n y y y Mac OS X Mavericks 10.9.5 64-bit n y/y n y y y Mac OS X Yosemite 10.10.5 64-bit n y/y n y y y Mac OS X El Capitan 10.11.6 64-bit n y/y n y y y Mac OS Sierra 10.12.6 64-bit n y/y n y y y CentOS 7.2 Linux 2.6.32 x86_64 PGI n y/y n y y y CentOS 7.2 Linux 2.6.32 x86_64 GNU y y/y y y y y CentOS 7.2 Linux 2.6.32 x86_64 Intel n y/y n y y y Linux 2.6.32-573.18.1.el6.ppc64 n y/y n y y y 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 7 x64 Cygwin n n n y Windows 10 y y y y Windows 10 x64 y y y y Mac OS X Mavericks 10.9.5 64-bit y n y y Mac OS X Yosemite 10.10.5 64-bit y n y y Mac OS X El Capitan 10.11.6 64-bit y n y y Mac OS Sierra 10.12.6 64-bit y n y y CentOS 7.2 Linux 2.6.32 x86_64 PGI y y y n CentOS 7.2 Linux 2.6.32 x86_64 GNU y y y y CentOS 7.2 Linux 2.6.32 x86_64 Intel y y y n Linux 2.6.32-573.18.1.el6.ppc64 y y y 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 2.6.32-573.22.1.el6 GNU C (gcc), Fortran (gfortran), C++ (g++) #1 SMP x86_64 GNU/Linux compilers: (mayll/platypus) Version 4.4.7 20120313 Version 4.9.3, 5.3.0, 6.2.0 PGI C, Fortran, C++ for 64-bit target on x86-64; Version 17.10-0 Intel(R) C (icc), C++ (icpc), Fortran (icc) compilers: Version 17.0.4.196 Build 20170411 MPICH 3.1.4 compiled with GCC 4.9.3 Linux 3.10.0-327.18.2.el7 GNU C (gcc) and C++ (g++) compilers #1 SMP x86_64 GNU/Linux Version 4.8.5 20150623 (Red Hat 4.8.5-4) (jelly) with NAG Fortran Compiler Release 6.1(Tozai) GCC Version 7.1.0 OpenMPI 3.0.0-GCC-7.2.0-2.29, 3.1.0-GCC-7.2.0-2.29 Intel(R) C (icc) and C++ (icpc) compilers Version 17.0.0.098 Build 20160721 with NAG Fortran Compiler Release 6.1(Tozai) Linux 3.10.0-327.10.1.el7 MPICH 3.2 compiled with GCC 5.3.0 #1 SMP x86_64 GNU/Linux (moohan) Linux 2.6.32-573.18.1.el6.ppc64 MPICH mpich 3.1.4 compiled with #1 SMP ppc64 GNU/Linux IBM XL C/C++ for Linux, V13.1 (ostrich) and IBM XL Fortran for Linux, V15.1 Fedora30 5.3.11-200.fc30.x86_64 #1 SMP x86_64 GNU/Linux GNU gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1 20190827) GNU Fortran (GCC) 9.2.1 20190827 (Red Hat 9.2.1 20190827) (cmake and autotools) 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. Three tests fail with OpenMPI 3.0.0/GCC-7.2.0-2.29: testphdf5 (ecdsetw, selnone, cchunk1, cchunk3, cchunk4, and actualio) t_shapesame (sscontig2) t_pflush1/fails on exit The first two tests fail attempting collective writes. CPP ptable test fails on VS2017 with Intel compiler, JIRA issue: HDFFV-10628. This test will pass with VS2015 with Intel compiler. Older MPI libraries such as OpenMPI 2.0.1 and MPICH 2.1.5 were tested while attempting to resolve the Jira issue: HDFFV-10540. The known problems of reading or writing > 2GBs when using MPI-2 was partially resolved with the MPICH library. The proposed support recognizes IO operations > 2GB and if the datatype is not a derived type, the library breaks the IO into chunks which can be input or output with the existing MPI 2 limitations, i.e. size reporting and function API size/count arguments are restricted to be 32 bit integers. For derived types larger than 2GB, MPICH 2.1.5 fails while attempting to read or write data. OpenMPI in contrast, implements MPI-3 APIs even in the older releases and thus does not suffer from the 32 bit size limitation described here. OpenMPI releases prior to v3.1.3 appear to have other datatype issues however, e.g. within a single parallel test (testphdf5) the subtests (cdsetr, eidsetr) report data verfication errors before eventually aborting. The most recent versions of OpenMPI (v3.1.3 or newer) have evidently resolved these isses and parallel HDF5 testing does not currently report errors though occasional hangs have been observed. 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.