cmake_minimum_required(VERSION 3.4...3.10)

project(pyncnn)

set(PACKAGE_VERSION ${NCNN_VERSION_STRING})
add_definitions(-DVERSION_INFO="${PACKAGE_VERSION}")

set( CMAKE_CXX_STANDARD 11 )
set( CMAKE_CXX_STANDARD_REQUIRED ON )

option(NCNN_SYSTEM_PYBIND11 "use system pybind11" OFF)

# pybind11 v3 defaults to CMake's FindPython module. Opt-in explicitly so the
# Python_EXECUTABLE / Python3_EXECUTABLE hints passed by setup.py are honored
# (the legacy PYTHON_EXECUTABLE / PYTHON_PREFIX / PYBIND11_PYTHONLIBS_OVERWRITE
# variables are no longer effective in pybind11 v3).
set(PYBIND11_FINDPYTHON NEW)

if(NCNN_SYSTEM_PYBIND11)
    find_package(pybind11)
    if(NOT pybind11_FOUND)
        message(WARNING "pybind11 package not found! NCNN_SYSTEM_PYBIND11 will be turned off.")
        set(NCNN_SYSTEM_PYBIND11 OFF)
    endif()
endif()

if(NOT NCNN_SYSTEM_PYBIND11)
    if(NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/pybind11/CMakeLists.txt")
        message(FATAL_ERROR "The submodules were not downloaded! Please update submodules with \"git submodule update --init\" and try again.")
    else()
        add_subdirectory(pybind11)
    endif()
endif()

if("${CMAKE_LIBRARY_OUTPUT_DIRECTORY}" STREQUAL "")
    if(MSVC OR CMAKE_GENERATOR STREQUAL "Xcode")
        set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG ${CMAKE_CURRENT_BINARY_DIR}/ncnn/)
        set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${CMAKE_CURRENT_BINARY_DIR}/ncnn/)
    endif(MSVC OR CMAKE_GENERATOR STREQUAL "Xcode")
endif("${CMAKE_LIBRARY_OUTPUT_DIRECTORY}" STREQUAL "")

# enable global link time optimization
cmake_policy(SET CMP0069 NEW)
set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)
include(CheckIPOSupported)
check_ipo_supported(RESULT ipo_supported OUTPUT ipo_supported_output)
if(ipo_supported)
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()

include_directories(${pybind11_INCLUDE_DIR} ${PYTHON_INCLUDE_DIRS})
pybind11_add_module(pyncnn src/main.cpp)
set_target_properties(pyncnn PROPERTIES OUTPUT_NAME "ncnn")
target_link_libraries(pyncnn PUBLIC ncnn)
set_target_properties(pyncnn PROPERTIES PREFIX "" LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/ncnn")
set_property(TARGET pyncnn PROPERTY FOLDER "python")
if("${CMAKE_LIBRARY_OUTPUT_DIRECTORY}" STREQUAL "")
    add_custom_command(TARGET pyncnn POST_BUILD 
        COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/ncnn/ncnn${PYTHON_MODULE_PREFIX}${PYTHON_MODULE_EXTENSION} 
        ${PROJECT_SOURCE_DIR}/ncnn/ncnn${PYTHON_MODULE_PREFIX}${PYTHON_MODULE_EXTENSION})
endif("${CMAKE_LIBRARY_OUTPUT_DIRECTORY}" STREQUAL "")

configure_file(setup.py.i ${PROJECT_SOURCE_DIR}/setup.py)