CMakeLists.txt

# Minimum CMake required
cmake_minimum_required(VERSION 3.1)

# Set default build type
if(NOT CMAKE_BUILD_TYPE)
    message(STATUS "Build type not set - defaulting to Release")
    set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build from: Debug Release RelWithDebInfo MinSizeRel Coverage." FORCE)
endif()

# Project
project(onnx C CXX)
option(ONNX_BUILD_BENCHMARKS "Build ONNX micro-benchmarks" OFF)

option(BUILD_ONNX_PYTHON "Build Python binaries" OFF)
option(ONNX_WERROR "Build with Werror" OFF)

# Set C++11 as standard for the whole project
set(CMAKE_CXX_STANDARD 11)

set(ONNX_ROOT ${PROJECT_SOURCE_DIR})

set(CMAKE_MODULE_PATH "")
list(APPEND CMAKE_MODULE_PATH ${ONNX_ROOT}/cmake/Modules)

if(TARGET protobuf::libprotobuf)
  # Sometimes we need to use protoc compiled for host architecture while
  # linking libprotobuf against target architecture. See
  # https://github.com/caffe2/caffe2/blob/96f35ad75480b25c1a23d6e9e97bccae9f7a7f9c/cmake/ProtoBuf.cmake#L92-L99
  if(EXISTS "${ONNX_CUSTOM_PROTOC_EXECUTABLE}")
    message(STATUS "Using custom protoc executable")
    set(ONNX_PROTOC_EXECUTABLE ${ONNX_CUSTOM_PROTOC_EXECUTABLE})
  else()
    set(ONNX_PROTOC_EXECUTABLE $<TARGET_FILE:protobuf::protoc>)
  endif()
else()
  # Customized version of find Protobuf. We need to avoid situations mentioned
  # in https://github.com/caffe2/caffe2/blob/b7d983f255ef5496474f1ea188edb5e0ac442761/cmake/ProtoBuf.cmake#L82-L92
  # The following section is stolen from cmake/ProtoBuf.cmake in Caffe2
  find_program(PROTOBUF_PROTOC_EXECUTABLE
    NAMES protoc
    DOC "The Google Protocol Buffers Compiler")

  # Only if protoc was found, seed the include directories and libraries.
  # We assume that protoc is installed at PREFIX/bin.
  # We use get_filename_component to resolve PREFIX.
  if(PROTOBUF_PROTOC_EXECUTABLE)
    set(ONNX_PROTOC_EXECUTABLE ${PROTOBUF_PROTOC_EXECUTABLE})
    get_filename_component(
      _PROTOBUF_INSTALL_PREFIX
      ${PROTOBUF_PROTOC_EXECUTABLE}
      DIRECTORY)
    get_filename_component(
      _PROTOBUF_INSTALL_PREFIX
      ${_PROTOBUF_INSTALL_PREFIX}/..
      REALPATH)
    find_library(PROTOBUF_LIBRARY
      NAMES protobuf
      PATHS ${_PROTOBUF_INSTALL_PREFIX}/lib
      NO_DEFAULT_PATH)
    find_library(PROTOBUF_PROTOC_LIBRARY
      NAMES protoc
      PATHS ${_PROTOBUF_INSTALL_PREFIX}/lib
      NO_DEFAULT_PATH)
    find_library(PROTOBUF_LITE_LIBRARY
      NAMES protobuf-lite
      PATHS ${_PROTOBUF_INSTALL_PREFIX}/lib
      NO_DEFAULT_PATH)
    find_path(PROTOBUF_INCLUDE_DIR
      google/protobuf/service.h
      PATHS ${_PROTOBUF_INSTALL_PREFIX}/include
      NO_DEFAULT_PATH)
    find_package(Protobuf REQUIRED)
  endif()
endif()

# Build the libraries with -fPIC
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

if(ONNX_NAMESPACE)
  SET(MY_ONNX_NAMESPACE "-DONNX_NAMESPACE=${ONNX_NAMESPACE}")
else()
  SET(ONNX_NAMESPACE "onnx")
  SET(MY_ONNX_NAMESPACE "-DONNX_NAMESPACE=onnx")
endif()
add_definitions(${MY_ONNX_NAMESPACE})

if(ONNX_ML)
  add_definitions("-DONNX_ML=1")
endif()

# function(RELATIVE_PROTOBUF_GENERATE_CPP SRCS HDRS ROOT_DIR)
# from https://github.com/tensorflow/tensorflow/blob/d2c3b873c6f8ff999a2e4ee707a84ff00d9c15a5/tensorflow/contrib/cmake/tf_core_framework.cmake
# to solve the problem that customized dir can't be specified when calling PROTOBUF_GENERATE_CPP.
function(RELATIVE_PROTOBUF_GENERATE_CPP NAME SRCS HDRS ROOT_DIR DEPEND)
  if(NOT ARGN)
    message(SEND_ERROR "Error: RELATIVE_PROTOBUF_GENERATE_CPP() called without any proto files")
    return()
  endif()

  if(MSVC AND BUILD_SHARED_LIBS)
    set(ONNX_DLLEXPORT_STR "dllexport_decl=ONNX_API:")
  else()
    set(ONNX_DLLEXPORT_STR "")
  endif()

  set(${SRCS})
  set(${HDRS})

  set(GEN_PROTO_PY ${ROOT_DIR}/onnx/gen_proto.py)
  foreach(INFILE ${ARGN})
    set(ABS_FILE ${ROOT_DIR}/${INFILE})
    get_filename_component(FILE_DIR ${ABS_FILE} DIRECTORY)
    get_filename_component(FILE_WE ${INFILE} NAME_WE)
    if(ONNX_ML)
      if(ONNX_NAMESPACE STREQUAL "onnx")
        set(GENERATED_FILE_WE "${FILE_WE}-ml")
      else()
        set(GENERATED_FILE_WE "${FILE_WE}_${ONNX_NAMESPACE}-ml")
      endif()
    else()
      if(ONNX_NAMESPACE STREQUAL "onnx")
        set(GENERATED_FILE_WE "${FILE_WE}")
      else()
        set(GENERATED_FILE_WE "${FILE_WE}_${ONNX_NAMESPACE}")
      endif()
    endif()
    file(RELATIVE_PATH REL_DIR ${ROOT_DIR} ${FILE_DIR})
    set(OUTPUT_PROTO_DIR "${CMAKE_CURRENT_BINARY_DIR}/${REL_DIR}")

    set(OUTPUT_PB_HEADER "${OUTPUT_PROTO_DIR}/${GENERATED_FILE_WE}.pb.h")
    set(OUTPUT_PB_SRC "${OUTPUT_PROTO_DIR}/${GENERATED_FILE_WE}.pb.cc")
    set(GENERATED_PROTO "${OUTPUT_PROTO_DIR}/${GENERATED_FILE_WE}.proto")
    if(NOT (ONNX_NAMESPACE STREQUAL "onnx"))
      # We need this dummy header generated by gen_proto.py when ONNX_NAMESPACE
      # is not onnx
      list(APPEND ${HDRS} "${OUTPUT_PROTO_DIR}/${GENERATED_FILE_WE}.pb.h")
    endif()
    list(APPEND ${SRCS} "${OUTPUT_PB_SRC}")
    list(APPEND ${HDRS} "${OUTPUT_PB_HEADER}")

    if(NOT EXISTS "${OUTPUT_PROTO_DIR}")
      file(MAKE_DIRECTORY "${OUTPUT_PROTO_DIR}")
    endif()

    if ("${PYTHON_EXECUTABLE}" STREQUAL "")
      set(_python_exe "python")
    else()
      set(_python_exe "${PYTHON_EXECUTABLE}")
    endif()
    set(GEN_PROTO_ARGS -p "${ONNX_NAMESPACE}" -o "${OUTPUT_PROTO_DIR}" "${FILE_WE}")
    if(ONNX_ML)
      list(APPEND GEN_PROTO_ARGS -m)
    endif()
    add_custom_command(
      OUTPUT "${GENERATED_PROTO}"
      COMMAND "${_python_exe}" "${GEN_PROTO_PY}"
      ARGS ${GEN_PROTO_ARGS}
      DEPENDS ${INFILE}
      COMMENT "Running gen_proto.py on ${INFILE}"
      VERBATIM )

    set(PROTOC_ARGS ${GENERATED_PROTO} -I ${OUTPUT_PROTO_DIR} --cpp_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
    if(BUILD_ONNX_PYTHON)
      list(APPEND PROTOC_ARGS --python_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
      if(NOT WIN32)
        # Haven't figured out how to generate mypy stubs on Windows yet
        list(APPEND PROTOC_ARGS --plugin protoc-gen-mypy=${ROOT_DIR}/tools/protoc-gen-mypy.py --mypy_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
      endif()
    endif()
    add_custom_command (
      OUTPUT "${OUTPUT_PB_SRC}"
             "${OUTPUT_PB_HEADER}"
      COMMAND ${ONNX_PROTOC_EXECUTABLE}
      ARGS ${PROTOC_ARGS}
      DEPENDS ${GENERATED_PROTO} ${DEPEND}
      COMMENT "Running C++ protocol buffer compiler on ${GENERATED_PROTO}"
      VERBATIM )
  add_custom_target(${NAME}
      DEPENDS ${OUTPUT_PB_SRC} ${OUTPUT_PB_HEADER})
  endforeach()

  set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
  set(${SRCS} ${${SRCS}} PARENT_SCOPE)
  set(${HDRS} ${${HDRS}} PARENT_SCOPE)
endfunction()

RELATIVE_PROTOBUF_GENERATE_CPP(gen_onnx_proto PROTO_SRCS PROTO_HDRS ${ONNX_ROOT} ""
    onnx/onnx.in.proto
)
RELATIVE_PROTOBUF_GENERATE_CPP(gen_onnx_operators_proto PROTO_SRCS2 PROTO_HDRS2 ${ONNX_ROOT} gen_onnx_proto 
    onnx/onnx-operators.in.proto
)
list(APPEND PROTO_SRCS ${PROTO_SRCS2})
list(APPEND PROTO_HDRS ${PROTO_HDRS2})

file(GLOB_RECURSE onnx_src
    "${ONNX_ROOT}/onnx/*.h"
    "${ONNX_ROOT}/onnx/*.cc"
)
list(REMOVE_ITEM onnx_src "${ONNX_ROOT}/onnx/cpp2py_export.cc")


add_library(onnx_proto ${PROTO_SRCS} ${PROTO_HDRS})
target_include_directories(onnx_proto PUBLIC "${CMAKE_CURRENT_BINARY_DIR}" "${PROTOBUF_INCLUDE_DIRS}")
if(TARGET protobuf::libprotobuf)
  target_link_libraries(onnx_proto PUBLIC protobuf::libprotobuf)
else()
  target_link_libraries(onnx_proto PUBLIC ${PROTOBUF_LIBRARIES})
endif()

if(MSVC)
  target_compile_options(onnx_proto PRIVATE /WX-)
endif()

add_library(onnx ${onnx_src})
target_include_directories(onnx PUBLIC ${ONNX_ROOT} "${CMAKE_CURRENT_BINARY_DIR}")
target_link_libraries(onnx PUBLIC onnx_proto)

if(BUILD_ONNX_PYTHON)
  if("${PY_EXT_SUFFIX}" STREQUAL "")
    if (MSVC)
      set(PY_EXT_SUFFIX ".pyd")
    else()
      set(PY_EXT_SUFFIX ".so")
    endif()
  endif()

  add_library(onnx_cpp2py_export MODULE "${ONNX_ROOT}/onnx/cpp2py_export.cc")
  set_target_properties(onnx_cpp2py_export PROPERTIES PREFIX "")
  set_target_properties(onnx_cpp2py_export PROPERTIES SUFFIX ${PY_EXT_SUFFIX})
  set_target_properties(onnx_cpp2py_export PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
  target_include_directories(onnx_cpp2py_export PRIVATE "${ONNX_ROOT}" "${CMAKE_CURRENT_BINARY_DIR}" "${PROTOBUF_INCLUDE_DIRS}" "${PYTHON_INCLUDE_DIR}")

  # pybind11 is a header only lib
  find_package(pybind11)
  if(pybind11_FOUND)
    target_include_directories(onnx_cpp2py_export PRIVATE ${pybind11_INCLUDE_DIRS})
  else()
    target_include_directories(onnx_cpp2py_export PRIVATE ${ONNX_ROOT}/third_party/pybind11/include)
  endif()

  if(APPLE)
    set_target_properties(onnx_cpp2py_export PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
    target_link_libraries(onnx_cpp2py_export PRIVATE -Wl,-force_load,$<TARGET_FILE:onnx>)
  elseif(MSVC)
    # In MSVC, we will add whole archive in default
    target_link_libraries(onnx_cpp2py_export PRIVATE -WHOLEARCHIVE:$<TARGET_FILE:onnx>)
  else()
    # Assume everything else is like gcc
    target_link_libraries(onnx_cpp2py_export PRIVATE "-Wl,--whole-archive" $<TARGET_FILE:onnx> "-Wl,--no-whole-archive")
  endif()

  target_link_libraries(onnx_cpp2py_export PRIVATE onnx)

  if(MSVC)
    find_package(PythonInterp ${PY_VERSION} REQUIRED)
    find_package(PythonLibs ${PY_VERSION} REQUIRED)
    target_link_libraries(onnx_cpp2py_export PRIVATE ${PYTHON_LIBRARIES})
    target_compile_options(onnx_cpp2py_export PRIVATE
      /MP
      /MX
      /wd4800 # disable warning type' : forcing value to bool 'true' or 'false' (performance warning)
      /wd4503 # identifier' : decorated name length exceeded, name was truncated
      )
    target_compile_options(onnx_cpp2py_export PRIVATE /MT)
  endif()
endif()

if(ONNX_BUILD_BENCHMARKS)
  if(NOT TARGET benchmark)
    # We will not need to test benchmark lib itself.
    set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "Disable benchmark testing as we don't need it.")
    # We will not need to install benchmark since we link it statically.
    set(BENCHMARK_ENABLE_INSTALL OFF CACHE BOOL "Disable benchmark install to avoid overwriting vendor install.")
    add_subdirectory(${PROJECT_SOURCE_DIR}/third_party/benchmark)
  endif()

  add_executable(protobuf-bench tools/protobuf-bench.cc)
  target_link_libraries(protobuf-bench onnx_proto benchmark)
endif()

# Export include directories
set(ONNX_INCLUDE_DIRS "${ONNX_ROOT}" "${CMAKE_CURRENT_BINARY_DIR}")
get_directory_property(hasParent PARENT_DIRECTORY)
if(hasParent)
    set(ONNX_INCLUDE_DIRS ${ONNX_INCLUDE_DIRS} PARENT_SCOPE)
endif()

if (MSVC)
    target_compile_options(onnx_proto PRIVATE
        /MP
        /MX
    )
    target_compile_options(onnx PRIVATE
        /MP
        /MX
        /WX
        /wd4800 # disable warning type' : forcing value to bool 'true' or 'false' (performance warning)
        /wd4503 # identifier' : decorated name length exceeded, name was truncated
        /wd4146 # unary minus operator applied to unsigned type, result still unsigned
    )
    if(${ONNX_USE_MSVC_STATIC_RUNTIME})
      if(${CMAKE_BUILD_TYPE} MATCHES "Debug")
        target_compile_options(onnx_proto PRIVATE /MTd)
        target_compile_options(onnx PRIVATE /MTd)
      else()
        target_compile_options(onnx_proto PRIVATE /MT)
        target_compile_options(onnx PRIVATE /MT)
      endif()
    else()
      if(${CMAKE_BUILD_TYPE} MATCHES "Debug")
        target_compile_options(onnx_proto PRIVATE /MDd)
        target_compile_options(onnx PRIVATE /MDd)
      else()
        target_compile_options(onnx_proto PRIVATE /MD)
        target_compile_options(onnx PRIVATE /MD)
      endif()
    endif()
    set(onnx_static_library_flags
        -IGNORE:4221 # LNK4221: This object file does not define any previously undefined public symbols, so it will not be used by any link operation that consumes this library
    )
    set_target_properties(onnx PROPERTIES
        STATIC_LIBRARY_FLAGS "${onnx_static_library_flags}")
elseif(APPLE)
else()
  if (${ONNX_WERROR})
    target_compile_options(onnx PRIVATE -Werror=sign-compare -Werror=conversion)
  endif()
endif()

if(APPLE)
    set_target_properties(onnx PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
endif()

# ---[ ONNX Interface for Framework Integratin (ONNXIFI)
add_library(onnxifi INTERFACE)
target_include_directories(onnxifi INTERFACE onnx)


install(TARGETS onnx onnx_proto
    DESTINATION lib)
install(DIRECTORY ${ONNX_ROOT}/onnx DESTINATION include
    FILES_MATCHING
    PATTERN "*.h")
install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/onnx DESTINATION include
    FILES_MATCHING
    PATTERN "*.h")