Build Plugin Using CMake*

Inference Engine build infrastructure provides the Inference Engine Developer Package for plugin development.

Inference Engine Developer Package

To automatically generate the Inference Engine Developer Package, run the cmake tool during a DLDT build:

$ mkdir dldt-release-build
$ cd dldt-release-build
$ cmake -DCMAKE_BUILD_TYPE=Release ../dldt 

Once the commands above are executed, the Inference Engine Developer Package is generated in the dldt-release-build folder. It consists of several files:

• InferenceEngineDeveloperPackageConfig.cmake - the main CMake script which imports targets and provides compilation flags and CMake options.
• InferenceEngineDeveloperPackageConfig-version.cmake - a file with a package version.
• targets_developer.cmake - an automatically generated file which contains all targets exported from the OpenVINO build tree. This file is included by InferenceEngineDeveloperPackageConfig.cmake to import the following targets:
  • Libraries for plugin development:
    • IE::ngraph - shared nGraph library
    • IE::inference_engine - shared Inference Engine library
    • IE::inference_engine_transformations - shared library with Inference Engine ngraph-based Transformations
    • IE::inference_engine_preproc - shared library with Inference Engine preprocessing plugin
    • IE::inference_engine_plugin_api - interface library with Inference Engine Plugin API headers
    • IE::inference_engine_lp_transformations - shared library with low-precision transformations
    • IE::pugixml - static Pugixml library
    • IE::xbyak - interface library with Xbyak headers
    • IE::itt - static library with tools for performance measurement using Intel ITT
  • Libraries for tests development:
    • IE::gtest, IE::gtest_main, IE::gmock - Google Tests framework libraries
    • IE::commonTestUtils - static library with common tests utilities
    • IE::funcTestUtils - static library with functional tests utilities
    • IE::unitTestUtils - static library with unit tests utilities
    • IE::ngraphFunctions - static library with the set of ngraph::Function builders
    • IE::funcSharedTests - static library with common functional tests

Note: it's enough just to run cmake --build . --target ie_dev_targets command to build only targets from the Inference Engine Developer package.

Build Plugin using Inference Engine Developer Package

To build a plugin source tree using the Inference Engine Developer Package, run the commands below:

$ mkdir template-plugin-release-build
$ cd template-plugin-release-build
$ cmake -DInferenceEngineDeveloperPackage_DIR=../dldt-release-build ../template-plugin

A common plugin consists of the following components:

1. Plugin code in the src folder
2. Code of tests in the tests folder

To build a plugin and its tests, run the following CMake scripts:

• Root CMakeLists.txt, which finds the Inference Engine Developer Package using the find_package CMake command and adds the src and tests subdirectories with plugin sources and their tests respectively:

cmake_minimum_required(VERSION 3.13.3)
 
project(InferenceEngineTemplatePlugin)
 
set(IE_MAIN_TEMPLATE_PLUGIN_SOURCE_DIR ${InferenceEngineTemplatePlugin_SOURCE_DIR})
 
find_package(InferenceEngineDeveloperPackage REQUIRED)
 
add_subdirectory(src)
 
if(ENABLE_TESTS)
    include(CTest)
    enable_testing()
 
    if(ENABLE_FUNCTIONAL_TESTS)
        add_subdirectory(tests/functional)
    endif()
endif()

NOTE: The default values of the ENABLE_TESTS, ENABLE_FUNCTIONAL_TESTS options are shared via the Inference Engine Developer Package and they are the same as for the main DLDT build tree. You can override them during plugin build using the command below:

```bash $ cmake -DENABLE_FUNCTIONAL_TESTS=OFF -DInferenceEngineDeveloperPackage_DIR=../dldt-release-build ../template-plugin ```

• src/CMakeLists.txt to build a plugin shared library from sources:

set(TARGET_NAME "templatePlugin")
 
file(GLOB SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
file(GLOB_RECURSE HEADERS ${CMAKE_CURRENT_SOURCE_DIR}/*.hpp)
 
# adds a shared library with plugin
ie_add_plugin(NAME ${TARGET_NAME}
              DEVICE_NAME "TEMPLATE"
              SOURCES ${SOURCES} ${HEADERS}
              SKIP_INSTALL # ATTENTION: uncomment to install component
              VERSION_DEFINES_FOR template_plugin.cpp)
 
target_include_directories(${TARGET_NAME} PRIVATE
    "${CMAKE_CURRENT_SOURCE_DIR}"
    "${IE_MAIN_TEMPLATE_PLUGIN_SOURCE_DIR}/include")
 
# link common Inference Engine libraries
target_link_libraries(${TARGET_NAME} PRIVATE
    IE::inference_engine
    IE::inference_engine_transformations
    ${NGRAPH_LIBRARIES})
 
# Link inference backend library to plugin. Here we use ngraph interpreter_backend as example
target_link_libraries(${TARGET_NAME} PRIVATE
    IE::ngraph_backend
    IE::interpreter_backend)
 
set_target_properties(${TARGET_NAME} PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE ${ENABLE_LTO})
 
# ATTENTION: uncomment to register a plugin in the plugins.xml file
if(ENABLE_TEMPLATE_PLUGIN)
    ie_register_plugins(MAIN_TARGET ${TARGET_NAME}
                        POSSIBLE_PLUGINS ${TARGET_NAME})
endif()

NOTE: IE::inference_engine target is imported from the Inference Engine Developer Package.

• tests/functional/CMakeLists.txt to build a set of functional plugin tests:

set(TARGET_NAME templateFuncTests)
 
addIeTargetTest(
        NAME ${TARGET_NAME}
        ROOT ${CMAKE_CURRENT_SOURCE_DIR}
        DEPENDENCIES
            templatePlugin
        LINK_LIBRARIES
            IE::funcSharedTests
        INCLUDES
            "${IE_MAIN_TEMPLATE_PLUGIN_SOURCE_DIR}/include"
        ADD_CPPLINT
        LABELS
            TEMPLATE
)

NOTE: The IE::funcSharedTests static library with common functional Inference Engine Plugin tests is imported via the Inference Engine Developer Package.