if ("cann${CANN_INSTALL_DIR}" STREQUAL "cann" AND DEFINED ENV{ASCEND_TOOLKIT_HOME})
    set(CANN_INSTALL_DIR $ENV{ASCEND_TOOLKIT_HOME})
    message(STATUS "CANN: updated CANN_INSTALL_DIR from ASCEND_TOOLKIT_HOME=$ENV{ASCEND_TOOLKIT_HOME}")
endif()

if (CANN_INSTALL_DIR)
    # Only Support Linux.
    if (NOT UNIX)
        message(FATAL_ERROR "CANN: CANN toolkit supports unix but not ${CMAKE_SYSTEM_NAME}")
    endif()

    # Supported platforms: x86-64, arm64
    if (CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
    elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64")
    else()
        message(FATAL_ERROR "CANN: CANN toolkit supports x86-64 and arm64 but not ${CMAKE_SYSTEM_PROCESSOR}")
    endif()

    # Set header and libs
    set(CANN_INCLUDE_DIRS
        ${CANN_INSTALL_DIR}/include
        ${CANN_INSTALL_DIR}/include/aclnn
        ${CANN_INSTALL_DIR}/acllib/include
    )

    add_subdirectory(kernels)
    list(APPEND CANN_LIBRARIES
        ascendcl
        nnopbase
        opapi
        acl_op_compiler
        ascendc_kernels
    )

    file(GLOB GGML_SOURCES_CANN "*.cpp")

    add_library(ggml-cann ${GGML_SOURCES_CANN})
    target_link_libraries(ggml-cann PRIVATE ggml-base ${CANN_LIBRARIES})
    target_include_directories(ggml-cann PRIVATE . .. ${CANN_INCLUDE_DIRS})
    target_link_directories(ggml-cann PRIVATE ${CANN_INSTALL_DIR}/lib64)

    message(STATUS "CANN: CANN_INCLUDE_DIRS =  ${CANN_INCLUDE_DIRS}")
    message(STATUS "CANN: CANN_LIBRARIES =  ${CANN_LIBRARIES}")
else()
    message(FATAL_ERROR "CANN: Can't find CANN_INSTALL_DIR, did you forget to source set_var.sh?")
endif()