[IE CLDNN] Build OCL ICD loader from sources (#6321)

* [IE CLDNN] Build ICD loader from sources

* [IE CLDNN] Switched ocl submodules to latest tag instead of master

* [IE CLDNN] Added several cmake variables to enable find_package for OpenCL

thirdparty/CMakeLists.txt

@@ -10,6 +10,7 @@ add_subdirectory(ittapi EXCLUDE_FROM_ALL)
 add_subdirectory(itt_collector EXCLUDE_FROM_ALL)
 add_subdirectory(zlib EXCLUDE_FROM_ALL)
 add_subdirectory(cnpy EXCLUDE_FROM_ALL)
+add_subdirectory(ocl EXCLUDE_FROM_ALL)
 
 add_subdirectory(xbyak EXCLUDE_FROM_ALL)
 openvino_developer_export_targets(COMPONENT openvino_common TARGETS xbyak)

thirdparty/ocl/CMakeLists.txt

@@ -0,0 +1,24 @@
+# Copyright (C) 2018-2021 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+#
+
+set(OPENCL_ICD_LOADER_HEADERS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/cl_headers/" CACHE PATH "Path to OCL includes" FORCE)
+
+set(OPENCL_HEADERS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/cl_headers/" "${CMAKE_CURRENT_SOURCE_DIR}/clhpp_headers/include/" CACHE PATH "Path to OCL (CL and CLHPP) includes" FORCE)
+
+# Reset compilation options for ICD loader as default IE options lead to removing a lot of symbols from the library
+set(CMAKE_C_VISIBILITY_PRESET default)
+set(CMAKE_SHARED_LINKER_FLAGS "")
+set(CMAKE_C_FLAGS "")
+set(CMAKE_CXX_FLAGS "")
+set(CMAKE_C_FLAGS_RELEASE "")
+set(CMAKE_CXX_FLAGS_RELEASE "")
+
+add_subdirectory(icd_loader)
+
+target_include_directories(OpenCL SYSTEM PUBLIC ${OPENCL_HEADERS_DIR})
+
+# The following varables are needed to make find_package(OpenCL) work
+set(OpenCL_VERSION_STRING "2.2" CACHE STRING "" FORCE)
+set(OpenCL_INCLUDE_DIR "${OPENCL_ICD_LOADER_HEADERS_DIR}" CACHE PATH "" FORCE)
+set(OPENCLROOT "${CMAKE_LIBRARY_OUTPUT_DIRECTORY}" CACHE PATH "" FORCE)