* This should reduce unnecessary recompilations after e.g. re-running
  configure or config.status.

* This might be needed in cases where the run fails due
  exhausted quota but touch still works.

* This implementation uses O(n) space like the previous
  one but still only half as much.
* Also, the implementation is now flexible in respect to
  the type to be sorted and uses the C preprocessor to
  achieve this multi-versioning.

* src could not be deleted in VPATH builds because
  mpi-profile directory stuck around.

* Since these are not C headers, the BUILT_SOURCES services are not
  actually needed here.

* mostlyclean is recursive and distclean-local should only depend on
  non-recursive targets.

* This way, source files for overrides need only be specified in configure and
  no longer also use per-file special rules in Makefile.

Moritz Hanke authored 2 years ago and Thomas Jahns committed 2 years ago

* adds abstract interface GPU specific routines (xt_gpu)
* adds CUDA implementation of GPU interface (xt_cuda)

Moritz Hanke authored 2 years ago and Thomas Jahns committed 2 years ago

adds new internal xt_ddt routines xt_ddt_get_memtype, xt_ddt_pack_internal, and xt_ddt_unpack_internal