Verwendung eines einheitlichen Backends in ArrayFire ⇐ C++

[Guest]

Ich versuche, mein Arrayfire-Backend basierend auf den verfügbaren Backends und deren Fähigkeiten auszuwählen (wenn das Backend Doubles unterstützt, dann verwenden Sie es, andernfalls nicht). Deshalb habe ich eine CMakeLists.txt-Datei erstellt:

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cmake_minimum_required(VERSION 3.10)

project(arrayfire_test)

if(USE_EXTERNAL_PATHS)
set(CMAKE_C_COMPILER ${C_COMPILER})# CACHE PATH "" FORCE)
set(CMAKE_CXX_COMPILER ${CXX_COMPILER})#CACHE PATH "" FORCE)
else()
set(CMAKE_C_COMPILER mpicc)
set(CMAKE_CXX_COMPILER mpic++)
endif()

if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
set(CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -fopenmp-simd")
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
set(CXX_FLAGS "${CMAKE_CXX_FLAGS} -xHost")
endif()

set(C_FLAGS "${CMAKE_C_FLAGS} ${CXX_FLAGS} -fPIC -flto -march=native -fopenmp -O2 -funroll-loops -funroll-all-loops -fstrict-aliasing  -std=gnu++14")
set(CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_FLAGS} -fPIC -flto -march=native -fopenmp -O2 -funroll-loops -funroll-all-loops -fstrict-aliasing  -std=gnu++14")

string(REPLACE " " ";" REPLACED_CXX_FLAGS ${CXX_FLAGS})

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/lib)

set(ArrayFire_DIR "/opt/arrayfire/share/ArrayFire/cmake")
FIND_PACKAGE(ArrayFire)

find_package(Armadillo REQUIRED PATHS "/opt/armadillo")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp -std=c++11 -O0 -g3 -flto -march=native")
set(FORGE_LIBRARIES  "/opt/arrayfire/lib/libforge.so")

INCLUDE_DIRECTORIES(${ArrayFire_INCLUDE_DIRS}
${ARMADILLO_INCLUDE_DIRS})

add_executable(${PROJECT_NAME} "source/main.cpp")

target_compile_options(${PROJECT_NAME} PRIVATE ${REPLACED_CXX_FLAGS})

TARGET_LINK_LIBRARIES(${PROJECT_NAME}
${ArrayFire_Unified_LIBRARIES}
${ARMADILLO_LIBRARIES})# ${FORGE_LIBRARIES})

und die Hauptdatei:

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int main(void){
int backends = af::getAvailableBackends ();
std::cout