convert OpenCL loader build from ExternalProject_add to ExternalCMakeProject

cmake/Modules/OpenCLLoader.cmake

@@ -4,47 +4,8 @@ set(OPENCL_LOADER_MD5 "1f23f7ee9934b2d102dcff68517cb7a8" CACHE STRING "MD5 check
 mark_as_advanced(OPENCL_LOADER_URL)
 mark_as_advanced(OPENCL_LOADER_MD5)
 
-include(ExternalProject)
+set(BUILD_SHARED_LIBS OFF)
-ExternalProject_Add(opencl_loader
+include(ExternalCMakeProject)
-                    URL             ${OPENCL_LOADER_URL}
+ExternalCMakeProject(opencl_loader ${OPENCL_LOADER_URL} ${OPENCL_LOADER_MD5} opencl-loader . "")
-                    URL_MD5         ${OPENCL_LOADER_MD5}
-                    SOURCE_DIR      "${CMAKE_BINARY_DIR}/opencl_loader-src"
-                    BINARY_DIR      "${CMAKE_BINARY_DIR}/opencl_loader-build"
-                    CMAKE_ARGS      ${CMAKE_REQUEST_PIC} ${CMAKE_EXTRA_OPENCL_LOADER_OPTS}
-                                    -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-                                    -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
-                                    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-                                    -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
-                                    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
-                    BUILD_BYPRODUCTS <BINARY_DIR>/libOpenCL${CMAKE_STATIC_LIBRARY_SUFFIX}
-                    LOG_DOWNLOAD ON
-                    LOG_CONFIGURE ON
-                    LOG_BUILD ON
-                    INSTALL_COMMAND ""
-                    TEST_COMMAND    "")
-
-ExternalProject_Get_Property(opencl_loader SOURCE_DIR)
-set(OPENCL_LOADER_INCLUDE_DIR ${SOURCE_DIR}/inc)
-
-# workaround for CMake 3.10 on ubuntu 18.04
-file(MAKE_DIRECTORY ${OPENCL_LOADER_INCLUDE_DIR})
-
-ExternalProject_Get_Property(opencl_loader BINARY_DIR)
-set(OPENCL_LOADER_LIBRARY_PATH "${BINARY_DIR}/libOpenCL${CMAKE_STATIC_LIBRARY_SUFFIX}")
-
-find_package(Threads QUIET)
-if(NOT WIN32)
-  set(OPENCL_LOADER_DEP_LIBS "Threads::Threads;${CMAKE_DL_LIBS}")
-else()
-  set(OPENCL_LOADER_DEP_LIBS "cfgmgr32;runtimeobject")
-endif()
-
-add_library(OpenCL::OpenCL UNKNOWN IMPORTED)
-add_dependencies(OpenCL::OpenCL opencl_loader)
-
-set_target_properties(OpenCL::OpenCL PROPERTIES
-  IMPORTED_LOCATION ${OPENCL_LOADER_LIBRARY_PATH}
-  INTERFACE_INCLUDE_DIRECTORIES ${OPENCL_LOADER_INCLUDE_DIR}
-  INTERFACE_LINK_LIBRARIES "${OPENCL_LOADER_DEP_LIBS}")
-
 
+add_library(OpenCL::OpenCL ALIAS OpenCL)