[v7,0/5] OpenMP/OpenACC: map clause and OMP gimplify rework

This series comprises the first few patches in support of several OpenMP
5.0 features: "lvalue" parsing for map/to/from clauses, "declare mapper"
support and array shaping/strided "target update" support.  These patches
provide the critical infrastructure changes needed to implement those
features.

Though labelled "v7", there are fewer patches here than in the
previously-posted "v6" series for mainline:

  https://gcc.gnu.org/pipermail/gcc-patches/2022-December/609031.html

Rather, this is more similar to the series posted for og13:

  https://gcc.gnu.org/pipermail/gcc-patches/2023-June/622213.html

Though rearranged somewhat and without several of the later
OpenACC-specific patches.

Further comments on individual patches.  Tested with offloading to NVPTX
and bootstrapped.  OK for mainline?

Julian Brown (5):
  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
  OpenMP/OpenACC: Reorganise OMP map clause handling in gimplify.cc

 gcc/c-family/c-common.h                       |   74 +-
 gcc/c-family/c-omp.cc                         |  834 ++++-
 gcc/c/c-parser.cc                             |   17 +-
 gcc/c/c-typeck.cc                             |  745 ++--
 gcc/cp/parser.cc                              |   17 +-
 gcc/cp/pt.cc                                  |    4 +-
 gcc/cp/semantics.cc                           | 1035 +++---
 gcc/fortran/dependency.cc                     |  128 +
 gcc/fortran/dependency.h                      |    1 +
 gcc/fortran/gfortran.h                        |    1 +
 gcc/fortran/trans-openmp.cc                   |  306 +-
 gcc/gimplify.cc                               | 1936 +++++++---
 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-enter-data-1.c   |    3 +-
 .../c-c++-common/gomp/target-implicit-map-2.c |    3 +-
 .../g++.dg/gomp/static-component-1.C          |   23 +
 gcc/testsuite/gcc.dg/gomp/target-3.c          |    2 +-
 gcc/testsuite/gfortran.dg/gomp/map-12.f90     |    2 +-
 gcc/testsuite/gfortran.dg/gomp/map-9.f90      |    2 +-
 .../gfortran.dg/gomp/map-subarray-2.f90       |   57 +
 .../gfortran.dg/gomp/map-subarray.f90         |   40 +
 gcc/tree-pretty-print.cc                      |    3 +
 gcc/tree.h                                    |    8 +
 include/gomp-constants.h                      |    6 +
 libgomp/oacc-mem.c                            |    6 +-
 libgomp/target.c                              |   98 +-
 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++/target-exit-data-reftoptr-1.C |   34 +
 .../testsuite/libgomp.c++/target-lambda-1.C   |    5 +-
 libgomp/testsuite/libgomp.c++/target-this-3.C |   11 +-
 libgomp/testsuite/libgomp.c++/target-this-4.C |   11 +-
 .../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.c-c++-common/ptr-attach-2.c       |   60 +
 .../target-implicit-map-2.c                   |    2 +
 .../target-implicit-map-5.c                   |   50 +
 .../libgomp.c-c++-common/target-map-zlas-1.c  |   36 +
 .../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-8.f90        |   47 +
 .../libgomp.fortran/map-subarray.f90          |   33 +
 .../libgomp.fortran/map-subcomponents.f90     |   32 +
 .../libgomp.fortran/struct-elem-map-1.f90     |  180 +
 59 files changed, 9039 insertions(+), 1536 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/gomp/static-component-1.C
 create mode 100644 gcc/testsuite/gfortran.dg/gomp/map-subarray-2.f90
 create mode 100644 gcc/testsuite/gfortran.dg/gomp/map-subarray.f90
 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++/target-exit-data-reftoptr-1.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.c-c++-common/ptr-attach-2.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/target-implicit-map-5.c
 create mode 100644 libgomp/testsuite/libgomp.c-c++-common/target-map-zlas-1.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-8.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subarray.f90
 create mode 100644 libgomp/testsuite/libgomp.fortran/map-subcomponents.f90