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gcc/ChangeLog: * internal-fn.cc (expand_GOMP_TARGET_REV): New. * internal-fn.def (GOMP_TARGET_REV): New. * lto-cgraph.cc (lto_output_node, verify_node_partition): Mark 'omp target device_ancestor_host' as in_other_partition and don't error if absent. * omp-low.cc (create_omp_child_function): Mark as 'noclone'. * omp-expand.cc (expand_omp_target): For reverse offload, remove sorry, use device = GOMP_DEVICE_HOST_FALLBACK and create empty-body nohost function. * omp-offload.cc (execute_omp_device_lower): Handle IFN_GOMP_TARGET_REV. (pass_omp_target_link::execute): For ACCEL_COMPILER, don't nullify fn argument for reverse offload libgomp/ChangeLog: * libgomp.texi (OpenMP 5.0): Mark 'ancestor' as implemented but refer to 'requires'. * testsuite/libgomp.c-c++-common/reverse-offload-1-aux.c: New test. * testsuite/libgomp.c-c++-common/reverse-offload-1.c: New test. * testsuite/libgomp.fortran/reverse-offload-1-aux.f90: New test. * testsuite/libgomp.fortran/reverse-offload-1.f90: New test. gcc/testsuite/ChangeLog: * c-c++-common/gomp/reverse-offload-1.c: Remove dg-sorry. * c-c++-common/gomp/target-device-ancestor-4.c: Likewise. * gfortran.dg/gomp/target-device-ancestor-4.f90: Likewise. * gfortran.dg/gomp/target-device-ancestor-5.f90: Likewise. * c-c++-common/goacc/classify-kernels-parloops.c: Add 'noclone' to scan-tree-dump-times. * c-c++-common/goacc/classify-kernels-unparallelized-parloops.c: Likewise. * c-c++-common/goacc/classify-kernels-unparallelized.c: Likewise. * c-c++-common/goacc/classify-kernels.c: Likewise. * c-c++-common/goacc/classify-parallel.c: Likewise. * c-c++-common/goacc/classify-serial.c: Likewise. * c-c++-common/goacc/kernels-counter-vars-function-scope.c: Likewise. * c-c++-common/goacc/kernels-loop-2.c: Likewise. * c-c++-common/goacc/kernels-loop-3.c: Likewise. * c-c++-common/goacc/kernels-loop-data-2.c: Likewise. * c-c++-common/goacc/kernels-loop-data-enter-exit-2.c: Likewise. * c-c++-common/goacc/kernels-loop-data-enter-exit.c: Likewise. * c-c++-common/goacc/kernels-loop-data-update.c: Likewise. * c-c++-common/goacc/kernels-loop-data.c: Likewise. * c-c++-common/goacc/kernels-loop-g.c: Likewise. * c-c++-common/goacc/kernels-loop-mod-not-zero.c: Likewise. * c-c++-common/goacc/kernels-loop-n.c: Likewise. * c-c++-common/goacc/kernels-loop-nest.c: Likewise. * c-c++-common/goacc/kernels-loop.c: Likewise. * c-c++-common/goacc/kernels-one-counter-var.c: Likewise. * c-c++-common/goacc/kernels-parallel-loop-data-enter-exit.c: Likewise. * gfortran.dg/goacc/classify-kernels-parloops.f95: Likewise. * gfortran.dg/goacc/classify-kernels-unparallelized-parloops.f95: Likewise. * gfortran.dg/goacc/classify-kernels-unparallelized.f95: Likewise. * gfortran.dg/goacc/classify-kernels.f95: Likewise. * gfortran.dg/goacc/classify-parallel.f95: Likewise. * gfortran.dg/goacc/classify-serial.f95: Likewise. * gfortran.dg/goacc/kernels-loop-2.f95: Likewise. * gfortran.dg/goacc/kernels-loop-data-2.f95: Likewise. * gfortran.dg/goacc/kernels-loop-data-enter-exit-2.f95: Likewise. * gfortran.dg/goacc/kernels-loop-data-enter-exit.f95: Likewise. * gfortran.dg/goacc/kernels-loop-data-update.f95: Likewise. * gfortran.dg/goacc/kernels-loop-data.f95: Likewise. * gfortran.dg/goacc/kernels-loop-n.f95: Likewise. * gfortran.dg/goacc/kernels-loop.f95: Likewise. * gfortran.dg/goacc/kernels-parallel-loop-data-enter-exit.f95: Likewise.