DKRZ projects

• contains a work-around for automake prior to 1.16 spurious file creation (no breakage)
• improves on build-workarounds for NAG Fortran
• improves libtool interaction with PGI compilers when invoked through a wrapper like mpicc
• adds a workaround for a Cray CCE code generation bug, where the compiler makes incorrect assumptions about pointer alignment.

• adds a file missing from the distribution archive (but is only needed when time-stamps get changed)
• fixes a problem when ifort or icc was used with the -diag-disable option having an argument as next command-line argument instead of separated by an equals sign
• fixes needed if autoreconf is performed with automake 1.16

• support for asynchronous exchanges (like MPI_Isend) and
• fixes for MPI implementations where MPI_Pack_size returns an actual upper bound and not the exact amount that MPI_Pack advances position by
• document the consequences segmented memory architectures might have

• User-defined redists via the xt_redist_single_array_base_new function
• Lots of minor cleanup and bug-fixing

• the option to change the RMA synchronization method of distributed multi-arrays,
• fixes to enable builds with g95,
• Kahan summation is right out-of-the-box on more systems (i.e. one less source of twiddling compiler flags).

• Improved g95 support.
• A memory free bug when concatenating empty redists.
• A minor bug fix for stripe overlap computation when stripe starts are far apart and stride is large.
• New constructor xt_redist_repeat_asym_new allows for different displacements in source and destination arrays.
• Various minor fixes to tests.

• The C part is now available as a separate library so that the differences in linking between Fortran and C can properly be accounted for.
• As a consequence of the above, friendlier generic interfaces are available for Fortran and mpif.h is no longer needed for building YAXT.
• Intercommunicators are supported for constructing Xmaps (destination indices can only be satisified from sources in the remote group) for both, xt_xmap_all2all_new and xt_xmap_dist_dir_new.
• Correctness and performance have been improved for index stripe lists (xt_idxstripes_new) and the distributed-directory based Xmap construction.
• Various internal and test-suite improvements.

• much expands C support of functionality previously only available in Fortran
• adds the distributed multi-array data structure especially to the C part
• full configure-time support for libtool
• minor fixes for various platforms and added support for BlueGene/Q

In summary the changes are:

• Better support for BlueGene/Q and cross-compilation.
• Copy constructors for xmaps and redists.
• Support for overlapping redist repeat constituents.
• Stricter declaration of some API functions (added const).
• 2 edge cases in stripe overlap got fixed.
• The tests got improved in numerous little places.
• Internal memory allocations have slightly less overhead.

The libaec repository, download page and everything else can now be found on our GlitLab server

https://gitlab.dkrz.de/k202009/libaec

Please update your links.