YAXT

The major point of this release is to improve test coverage, fix edge cases and add corresponding regression tests, and complete missing parts in the API.

Minor feature additions:

• Adds convenience wrappers for arrays of single- and double-precision complex type to the Fortran xt_redist interfaces.
• Adds the xt_redist_collection_static_custom_new and xt_redist_collection_custom_new interfaces to the Fortran module. This is primarily for trivial translations from C code to Fortran: all constructors in these interfaces have already been available through the xt_redist_collection_static_new and xt_redist_collection_custom_new interfaces as well.
• Rounds out the aggregation of redist collections into redist collections.
• Make more of the sorting routines available to Fortran.
• When available and the default MPI error handler is overridden by the user, MPI errors also result in a stack trace.

This release also fixes a number of issues for the 0.12 release branch:

• Prevent spurious recompilation of identically generated sources.
• Amend the incomplete argument adjustment of xt_exchanger_copy from C to Fortran.
• Fix the Fortran interface for xt_xmap_intersection_new when one of the argument arrays has size 0.
• Fix copying of a block in an int array with an incorrect size for redists constructed from position extents and correspondingly fix the growth of a temporary buffer.
• Fix incorrect handling of datatype caching for nested redist collections.
• Prevents double-free of cached MPI datatypes.
• Fix handling of inequal offsets for the receiving and sending side of a transfer with the neighbour communicator exchanger.
• Fix index position queries for xt_idxempty to assign -1 to the position out parameter.
• Add deprecation notice for xt_idxlist_get_positions_of_indices_off and xt_idxlist_get_position_of_index_off
• Add configure-time detection of a bug in the nvfortran 26.1 to 26.7 compilers that prevents correct resolution of some generic interfaces.
• Fix unexpected coupling of configure tests for Fortran support for abstract interfaces and interface blocks for functions accepting bind(c) functions which return a struct as argument. This resulted in build failures for NEC nfort.
• Fix libtool handling of some Intel compiler command-line arguments which are available in a single argument variant since version 15 (e.g. -diag-disable=10101 instead of -diag-disable 10101).
• Fix a bug in the intersection size computed for a mapping with a negative iteration direction position extent.
• Fix a bug in the appending to stripes of length 1 resulting in an incorrect index sequence.
• Fix an edge case when an idxsection has alternating dimension iteration directions.
• Fix position queries for indices just beyond the bounds for index lists of type idxsection.
• Fix datatype queries for the redist collection type when queried for ranks for which no communication occurs.
• Fix behaviour of zero-stride stripes in intersection computation.
• Fix edge cases in the sorting query of index list collections when a list containing a single index value is part of the collection.
• Use a conversion to unsigned to enforce 2-complement arithmetic and prevent undefined behaviour from abs(INT_MIN).
• Document the changed caching behaviour introduced in the 0.12 release series.
• Fix an incorrect count when not all indices can be mapped to stripes.
• Fix an index duplication issue when large index values are used for intersections and single_match_only is requested.
• Minor memory leak when the bucket computation is changed more than once for a custom configuration object.
• New query xt_redist_get_bsend_buf_size for the size requirements imposed by a redist on the buffer attached with
  MPI_Buf_attach for buffered send operations.