Phalanx: View-of-Views unit test compilation errors in Cuda builds with UVM

[ndellingwood]

Bug Report

@trilinos/phalanx @rppawlo

Cuda builds with UVM enabled error out during compilation of the packages/phalanx/test/ViewOfViews/tPhalanxViewOfViews.cpp unit test:

[100%] Building CXX object packages/phalanx/test/ViewOfViews/CMakeFiles/Phalanx_tViewOfViews.dir/tPhalanxViewOfViews.cpp.o
/home/ndellin/trilinos/Trilinos-pristine/packages/kokkos/core/src/impl/Kokkos_ViewMapping.hpp(3427): error: no suitable user-defined conversion from "const Kokkos::HostSpace::memory_space" to "const memory_space" exists
          detected during:
            instantiation of "Kokkos::Impl::SharedAllocationRecord<void, void> *Kokkos::Impl::ViewMapping<Traits, std::enable_if_t<<expression>, void>>::allocate_shared(const Kokkos::Impl::ViewCtorProp<P...> &, const Traits::array_layout &, __nv_bool) [with Traits=Kokkos::ViewTraits<Kokkos::View<double ***, mem_t> **, std::conditional_t<true, Kokkos::Cuda::array_layout, Kokkos::Cuda::array_layout>, Kokkos::Device<Kokkos::HostSpace::execution_space, Kokkos::Cuda::memory_space>, std::conditional_t<false, void, Kokkos::Experimental::DefaultViewHooks>>, P=<Kokkos::HostSpace, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, Kokkos::HostSpace::execution_space>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/kokkos/core/src/Kokkos_View.hpp(1422): here
            instantiation of "Kokkos::View<DataType, Properties...>::View(const Kokkos::Impl::ViewCtorProp<P...> &, const std::enable_if_t<<expression>, Kokkos::ViewTraits<DataType, Properties...>::array_layout> &) [with DataType=Kokkos::View<double ***, mem_t> **, Properties=<std::conditional_t<true, Kokkos::Cuda::array_layout, Kokkos::Cuda::array_layout>, Kokkos::Device<Kokkos::HostSpace::execution_space, Kokkos::Cuda::memory_space>, std::conditional_t<false, void, Kokkos::Experimental::DefaultViewHooks>>, P=<Kokkos::HostSpace, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/kokkos/core/src/Kokkos_View.hpp(1465): here
            instantiation of "Kokkos::View<DataType, Properties...>::View(const Kokkos::Impl::ViewCtorProp<P...> &, std::enable_if_t<<expression>, size_t>, size_t, size_t, size_t, size_t, size_t, size_t, size_t) [with DataType=Kokkos::View<double ***, mem_t> **, Properties=<std::conditional_t<true, Kokkos::Cuda::array_layout, Kokkos::Cuda::array_layout>, Kokkos::Device<Kokkos::HostSpace::execution_space, Kokkos::Cuda::memory_space>, std::conditional_t<false, void, Kokkos::Experimental::DefaultViewHooks>>, P=<Kokkos::HostSpace, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/phalanx/src/Phalanx_KokkosViewOfViews.hpp(327): here
            instantiation of "PHX::ViewOfViews3<OuterViewRank, InnerViewType, OuterViewProps...>::ViewOfViews3(const ExecSpace &, std::__cxx11::string, Extents...) [with OuterViewRank=2, InnerViewType=Kokkos::View<double ***, mem_t>, OuterViewProps=<mem_t>, ExecSpace=Kokkos::Cuda, Extents=<int, int>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/phalanx/test/ViewOfViews/tPhalanxViewOfViews.cpp(289): here

/home/ndellin/trilinos/Trilinos-pristine/packages/kokkos/core/src/Kokkos_View.hpp(1334): error: static assertion failed with "Incompatible View copy assignment"
          detected during:
            instantiation of "std::enable_if_t<Kokkos::Impl::ViewMapping<Kokkos::View<DataType, Properties...>::traits, Kokkos::View<RT, RP...>::traits, Kokkos::ViewTraits<DataType, Properties...>::specialize>::is_assignable_data_type, Kokkos::View<DataType, Properties...>> &Kokkos::View<DataType, Properties...>::operator=(const Kokkos::View<RT, RP...> &) [with DataType=Kokkos::View<double ***, mem_t> **, Properties=<std::conditional_t<true, Kokkos::Cuda::array_layout, Kokkos::Cuda::array_layout>, Kokkos::Device<Kokkos::HostSpace::execution_space, Kokkos::Cuda::memory_space>, std::conditional_t<false, void, Kokkos::Experimental::DefaultViewHooks>>, RT=Kokkos::View<double ***, mem_t> **, RP=<std::conditional_t<true, Kokkos::Cuda::array_layout, Kokkos::Cuda::array_layout>, Kokkos::HostSpace>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/phalanx/src/Phalanx_KokkosViewOfViews.hpp(334): here
            instantiation of "PHX::ViewOfViews3<OuterViewRank, InnerViewType, OuterViewProps...>::ViewOfViews3(const ExecSpace &, std::__cxx11::string, Extents...) [with OuterViewRank=2, InnerViewType=Kokkos::View<double ***, mem_t>, OuterViewProps=<mem_t>, ExecSpace=Kokkos::Cuda, Extents=<int, int>]"
/home/ndellin/trilinos/Trilinos-pristine/packages/phalanx/test/ViewOfViews/tPhalanxViewOfViews.cpp(289): here

I'm guessing this may be related to changes merged with #12032?

Steps to Reproduce

1. SHA1: bb2b208
2. Configure script: (Weaver testbed, rhel8 queue)

# Get interactive a compute node
bsub -Is -n 1 -q rhel8 -gpu "num=1" bash

# Load env
export ATDM_CONFIG_REGISTER_CUSTOM_CONFIG_DIR=${TRILINOS_DIR}/cmake/std/atdm/contributed/weaver
source ${TRILINOS_DIR}/cmake/std/atdm/load-env.sh weaver-cuda-11.2-opt
export OMPI_CXX="$KOKKOS_PATH/bin/nvcc_wrapper"

# Configuration - Cuda build, UVM

cmake \
      -DCMAKE_CXX_FLAGS='-g' \
      -DCMAKE_CXX_STANDARD="17" \
      -DCMAKE_INSTALL_PREFIX=$PWD/install \
      -DTrilinos_CONFIGURE_OPTIONS_FILE:STRING=cmake/std/atdm/ATDMDevEnv.cmake \
      -DTrilinos_ENABLE_COMPLEX_DOUBLE=ON \
      -DTrilinos_ENABLE_TESTS=OFF \
      -DTrilinos_ENABLE_ALL_PACKAGES=OFF \
      -DTPL_ENABLE_CUSPARSE:BOOL=ON \
      -DFC_FN_UNDERSCORE=UNDER \
      \
      -D Trilinos_ENABLE_Kokkos=ON \
      -D Kokkos_ARCH_VOLTA70=ON \
      -D Kokkos_ARCH_POWER9=ON \
      -D Kokkos_ENABLE_CUDA=ON \
      -D Kokkos_ENABLE_CUDA_LAMBDA=ON \
      -D Kokkos_ENABLE_CUDA_UVM=ON \
      -D KokkosKernels_INST_MEMSPACE_CUDAUVMSPACE=ON \
      -D Trilinos_ENABLE_Sacado=ON \
      -D Trilinos_ENABLE_Phalanx=ON \
      -D Phalanx_ENABLE_TESTS=ON \
      \
$TRILINOS_DIR

[GrahamBenHarper]

Did the PR fix the issue?

[ndellingwood]

#12054 resolved the issue, thanks @rppawlo !