include(ExternalProject)

# update eigen to the commit id f612df27 on 03/16/2021
set(EIGEN_PREFIX_DIR ${THIRD_PARTY_PATH}/eigen3)
set(EIGEN_SOURCE_DIR ${THIRD_PARTY_PATH}/eigen3/src/extern_eigen3)
set(EIGEN_REPOSITORY https://gitlab.com/libeigen/eigen.git)
set(EIGEN_TAG        f612df273689a19d25b45ca4f8269463207c4fee)

cache_third_party(extern_eigen3
    REPOSITORY    ${EIGEN_REPOSITORY}
    TAG           ${EIGEN_TAG}
    DIR           EIGEN_SOURCE_DIR)

if(WIN32)
    add_definitions(-DEIGEN_STRONG_INLINE=inline)
elseif(LINUX)
    if(WITH_ROCM)
        # For HIPCC Eigen::internal::device::numeric_limits is not EIGEN_DEVICE_FUNC
        # which will cause compiler error of using __host__ funciont in __host__ __device__
        file(TO_NATIVE_PATH ${PADDLE_SOURCE_DIR}/patches/eigen/Meta.h native_src)
        file(TO_NATIVE_PATH ${EIGEN_SOURCE_DIR}/Eigen/src/Core/util/Meta.h native_dst)
        file(TO_NATIVE_PATH ${PADDLE_SOURCE_DIR}/patches/eigen/TensorReductionGpu.h native_src1)
        file(TO_NATIVE_PATH ${EIGEN_SOURCE_DIR}/unsupported/Eigen/CXX11/src/Tensor/TensorReductionGpu.h native_dst1)
        set(EIGEN_PATCH_COMMAND cp ${native_src} ${native_dst} && cp ${native_src1} ${native_dst1})
    endif()
endif()

set(EIGEN_INCLUDE_DIR ${EIGEN_SOURCE_DIR})
INCLUDE_DIRECTORIES(${EIGEN_INCLUDE_DIR})

ExternalProject_Add(
    extern_eigen3
    ${EXTERNAL_PROJECT_LOG_ARGS}
    ${SHALLOW_CLONE}
    "${EIGEN_DOWNLOAD_CMD}"
    PREFIX          ${EIGEN_PREFIX_DIR}
    SOURCE_DIR      ${EIGEN_SOURCE_DIR}
    UPDATE_COMMAND    ""
    PATCH_COMMAND     ${EIGEN_PATCH_COMMAND}
    CONFIGURE_COMMAND ""
    BUILD_COMMAND     ""
    INSTALL_COMMAND   ""
    TEST_COMMAND      ""
)

add_library(eigen3 INTERFACE)

add_dependencies(eigen3 extern_eigen3)

# sw not support thread_local semantic
if(WITH_SW)
  add_definitions(-DEIGEN_AVOID_THREAD_LOCAL)
endif()