H5fortran Versions Save

%open, %close for files--the older %initialize, %finalize continue to work. %open_group, %close_group for groups now.

Added a destructor finalization method that automatically flushes data to disk and closes file when leaving procedure scope. This helps avoid data corruption if user forgets to %close().

updated to zlib 2.0.4

refactored h5fortran v3.8.0 internal polymorphism to use TKR-unique interfaces instead of select type. That is, compile-time polymorphism instead of runtime polymorphism. This helps give clearer compile-time warnings/errors, improved runtime stability, specifically for GCC 11.1 which has a always crashing on file write bug that this fixes.

use patched zlib 2.0.3 that also works with GCC MPICC (was a bugfix). This should remove anyone's need for -Dzlib_legacy

In case of a regression with Zlib 2.x on some less common computers, we provide a workaround to use Zlib 1.x by

cmake -B build -Dzlib_legacy=on

Please let us know and/or report the issue to zlib-ng project as Zlib 2.x should be a drop-in replacement for Zlib 1.x.

allow system zlib to be used when building hdf5

this avoids twice-defined ZLIB::ZLIB errors

If there's still errors, recommend manually specifying to build HDF5:

cmake -B build -Dhdf5_external=on

Whether manual or auto build HDF5 library, we now use zlib-ng 2.0.2 stable release. They claim considerably faster read and write. Also zlib-ng has extensive testing beyond legacy zlib.

• use sha256 to check HDF5 and ZLIB source hash
• don't needlessly export--just default install to build dir for same effect and more reliable
• note that HL is not needed but implied and silently accepted

also enhance external project not rebuilding each time