GitLab

Compiling IPPL for CUDA fails with the error message

ippl/src/Solver/SolverParams.h(68): error: structured binding cannot be captured

The relevant line is in the output function

        friend
        std::ostream& operator<<(std::ostream& os, const SolverParams& sp) {
            for (const auto& [key, value] : sp.params_m) {
                std::visit([&](auto&& arg){
                    os << std::left << std::setw(20) << key // line 68
                       << " " << arg << '\n';
                }, value);
            }
            return os;
        }

A similar error is produced when compiling IPPL with the current master branch of IPPL Solvers, except it's ParameterList that fails to compile.

Loaded modules:

Currently Loaded Modulefiles:
  1) cmake/3.19.2            2) gcc/10.2.0              3) cuda/11.2.2             4) openmpi/4.0.5-1_slurm   5) boost/1.73.0-1_slurm    6) psi-python37/2018.12    7) kokkos/3.3.01_dgx

Install script:

#!/bin/bash

# recipe for
P=ippl
ENABLE_FFT=OFF

# Build options
build_type=cuda
BUILD=Release

# Paths
export SRC_DIR=/data/user/me
export Kokkos_DIR=$KOKKOS_DIR
export PREFIX=/data/user/me/ippl_$build_type
export NJOBS=8

# internal variables
compiler="$(which mpicxx)"
CUDA=OFF
SERIAL=OFF
OPENMP=OFF
CXXFLAGS=""

if [[ "$build_type" == "cuda" ]]; then
    echo "Build Cuda mode."
    compiler="${Kokkos_DIR}/bin/nvcc_wrapper"
    CXXFLAGS="--expt-extended-lambda"
elif [[ "$build_type" == "serial" ]]; then
    echo "Build serial mode."
elif [[ "$build_type" == "openmp" ]]; then
    echo "Build OpenMP mode."
else
    echo "Wrong build type."
fi


# configure
mkdir -p "${SRC_DIR}/$P/build_"$build_type && cd "$_"
cmake \
    -DCMAKE_INSTALL_PREFIX=${PREFIX} \
    -DCMAKE_CXX_COMPILER="$compiler" \
    -DCMAKE_CXX_EXTENSIONS=OFF \
    -DENABLE_IPPLTESTS=ON \
    -DBUILD_UNIT_TESTS=OFF \
    -DENABLE_FFT="${ENABLE_FFT}" \
    -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
    -DCMAKE_BUILD_TYPE=$BUILD \
    "${SRC_DIR}/$P"

# compile & install
make -j ${NJOBS}
make install