# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

INCLUDE(cblas)

IF(NOT ${CBLAS_FOUND})
    INCLUDE(ExternalProject)

    SET(CBLAS_SOURCES_DIR ${THIRD_PARTY_PATH}/openblas)
    SET(CBLAS_INSTALL_DIR ${THIRD_PARTY_PATH}/install/openblas)
    SET(CBLAS_INC_DIR "${CBLAS_INSTALL_DIR}/include" CACHE PATH "openblas include directory." FORCE)

    IF(WIN32)
        SET(CBLAS_LIBRARIES "${CBLAS_INSTALL_DIR}/lib/openblas.lib" CACHE FILEPATH "openblas library." FORCE)
    ELSE(WIN32)
        SET(CBLAS_LIBRARIES "${CBLAS_INSTALL_DIR}/lib/libopenblas.a" CACHE FILEPATH "openblas library" FORCE)
    ENDIF(WIN32)

    IF(CMAKE_COMPILER_IS_GNUCC)
        ENABLE_LANGUAGE(Fortran)
        LIST(APPEND CBLAS_LIBRARIES gfortran pthread)
    ENDIF(CMAKE_COMPILER_IS_GNUCC)

    IF(NOT CMAKE_Fortran_COMPILER)
        MESSAGE(FATAL_ERROR "To build lapack in libopenblas, "
                "you need to set gfortran compiler: cmake .. -DCMAKE_Fortran_COMPILER=...")
    ENDIF(NOT CMAKE_Fortran_COMPILER)

    ExternalProject_Add(
        openblas
        GIT_REPOSITORY      https://github.com/xianyi/OpenBLAS.git
        GIT_TAG             v0.2.19
        PREFIX              ${CBLAS_SOURCES_DIR}
        INSTALL_DIR         ${CBLAS_INSTALL_DIR}
        BUILD_IN_SOURCE     1
        BUILD_COMMAND       ${CMAKE_MAKE_PROGRAM} FC=${CMAKE_Fortran_COMPILER} CC=${CMAKE_C_COMPILER} HOSTCC=${CMAKE_C_COMPILER} NO_SHARED=1 libs netlib
        INSTALL_COMMAND     ${CMAKE_MAKE_PROGRAM} install NO_SHARED=1 PREFIX=<INSTALL_DIR>
        UPDATE_COMMAND      ""
        CONFIGURE_COMMAND   ""
    )

    ExternalProject_Add_Step(
        openblas lapacke_install
        COMMAND ${CMAKE_COMMAND} -E copy "${CBLAS_SOURCES_DIR}/src/openblas/lapack-netlib/LAPACKE/include/lapacke_mangling_with_flags.h" "${CBLAS_INSTALL_DIR}/include/lapacke_mangling.h"
        COMMAND ${CMAKE_COMMAND} -E copy "${CBLAS_SOURCES_DIR}/src/openblas/lapack-netlib/LAPACKE/include/lapacke.h" "${CBLAS_INSTALL_DIR}/include/lapacke.h"
        COMMAND ${CMAKE_COMMAND} -E copy "${CBLAS_SOURCES_DIR}/src/openblas/lapack-netlib/LAPACKE/include/lapacke_config.h" "${CBLAS_INSTALL_DIR}/include/lapacke_config.h"
        COMMAND ${CMAKE_COMMAND} -E copy "${CBLAS_SOURCES_DIR}/src/openblas/lapack-netlib/LAPACKE/include/lapacke_utils.h" "${CBLAS_INSTALL_DIR}/include/lapacke_utils.h"
        DEPENDEES install
    )

    LIST(APPEND external_project_dependencies openblas)
ENDIF(NOT ${CBLAS_FOUND})

INCLUDE_DIRECTORIES(${CBLAS_INC_DIR})