[v5,0/4] OpenMP/OpenACC: Fortran array descriptor mappings

This is a new version of the previously-posted series:

  https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603103.html

This version rearranges the patches so the already-approved first two
patches come first -- albeit with some XFAILs -- and alters how Fortran
array-descriptor mappings work in order to hopefully better handle
some corner cases that have come up in previous rounds of patch review
(details in patch 3/4).

Patch 4/4 no longer sorts "unordered" structs, but instead has been
refactored into a runtime check that different elements of the same array
(of structs) are not being used for multiple mappings -- for cases where
we can't determine if the elements are the same or not at compile time.

Retested with offloading to NVPTX. OK?

Julian Brown (4):
  OpenMP/OpenACC: Reindent TO/FROM/_CACHE_ stanza in
    {c_}finish_omp_clause
  OpenMP/OpenACC: Rework clause expansion and nested struct handling
  OpenMP: Pointers and member mappings
  OpenMP/OpenACC: Unordered/non-constant component offset runtime
    diagnostic

 gcc/c-family/c-common.h                       |   70 +
 gcc/c-family/c-omp.cc                         |  766 +++-
 gcc/c/c-typeck.cc                             |  732 ++--
 gcc/cp/semantics.cc                           | 1013 +++---
 gcc/fortran/dependency.cc                     |  128 +
 gcc/fortran/dependency.h                      |    1 +
 gcc/fortran/gfortran.h                        |    1 +
 gcc/fortran/trans-openmp.cc                   |  272 +-
 gcc/gimplify.cc                               | 1178 +++++-
 gcc/omp-general.cc                            |  425 +++
 gcc/omp-general.h                             |   69 +
 gcc/omp-low.cc                                |    8 +-
 gcc/testsuite/c-c++-common/gomp/clauses-2.c   |    2 +-
 gcc/testsuite/c-c++-common/gomp/target-50.c   |    2 +-
 .../c-c++-common/gomp/target-implicit-map-2.c |    2 +-
 .../g++.dg/gomp/static-component-1.C          |   23 +
 gcc/testsuite/gcc.dg/gomp/target-3.c          |    2 +-
 gcc/tree-pretty-print.cc                      |    3 +
 gcc/tree.h                                    |    4 +
 include/gomp-constants.h                      |    6 +
 libgomp/oacc-mem.c                            |    6 +-
 libgomp/target.c                              |   91 +-
 libgomp/testsuite/libgomp.c++/baseptrs-3.C    |  275 ++
 libgomp/testsuite/libgomp.c++/baseptrs-4.C    | 3154 +++++++++++++++++
 libgomp/testsuite/libgomp.c++/baseptrs-5.C    |   62 +
 libgomp/testsuite/libgomp.c++/class-array-1.C |   59 +
 libgomp/testsuite/libgomp.c++/target-48.C     |   32 +
 libgomp/testsuite/libgomp.c++/target-49.C     |   37 +
 .../libgomp.c-c++-common/baseptrs-1.c         |   50 +
 .../libgomp.c-c++-common/baseptrs-2.c         |   70 +
 .../map-arrayofstruct-1.c                     |   38 +
 .../map-arrayofstruct-2.c                     |   58 +
 .../map-arrayofstruct-3.c                     |   68 +
 libgomp/testsuite/libgomp.c/target-22.c       |    3 +-
 .../libgomp.fortran/map-subarray-2.f90        |  108 +
 .../libgomp.fortran/map-subarray-3.f90        |   62 +
 .../libgomp.fortran/map-subarray-4.f90        |   35 +
 .../libgomp.fortran/map-subarray-5.f90        |   54 +
 .../libgomp.fortran/map-subarray-6.f90        |   26 +
 .../libgomp.fortran/map-subarray-7.f90        |   29 +
 .../libgomp.fortran/map-subarray.f90          |   33 +
 .../libgomp.fortran/map-subcomponents.f90     |   32 +
 .../libgomp.fortran/struct-elem-map-1.f90     |   10 +-
 43 files changed, 7908 insertions(+), 1191 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/gomp/static-component-1.C
 create mode 100644 libgomp/testsuite/libgomp.c++/baseptrs-3.C
 create mode 100644 libgomp/testsuite/libgomp.c++/baseptrs-4.C
 create mode 100644 libgomp/testsuite/libgomp.c++/baseptrs-5.C
 create mode 100644 libgomp/testsuite/libgomp.c++/class-array-1.C
 create mode 100644 libgomp/testsuite/libgomp.c++/target-48.C
 create mode 100644 libgomp/testsuite/libgomp.c++/target-49.C
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/baseptrs-1.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/baseptrs-2.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/map-arrayofstruct-1.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/map-arrayofstruct-2.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/map-arrayofstruct-3.c
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-2.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-3.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-4.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-5.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-6.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray-7.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subcomponents.f90