[SYCL] Add CMake macro for building targets with device code (#1966)

The `add_sycl_executable` can be used to create device code-enabled unit tests.

Signed-off-by: Alexander Batashev <[email protected]>

Author: Alexander Batashev

sycl/CMakeLists.txt

@@ -8,6 +8,9 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 option(SYCL_ENABLE_WERROR "Treat all warnings as errors in SYCL project" OFF)
 option(SYCL_ADD_DEV_VERSION_POSTFIX "Adds -V postfix to version string" ON)
 
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
+include(AddSYCLExecutable)
+
 set(SYCL_MAJOR_VERSION 2)
 set(SYCL_MINOR_VERSION 1)
 set(SYCL_PATCH_VERSION 0)
@@ -372,3 +375,5 @@ add_custom_target(deploy-sycl-toolchain
 
 # SYCL Runtime documentation
 add_subdirectory(doc)
+
+add_subdirectory(examples)

sycl/cmake/modules/AddSYCLExecutable.cmake

@@ -0,0 +1,24 @@
+macro(add_sycl_executable ARG_TARGET_NAME)
+  cmake_parse_arguments(ARG
+    ""
+    "OPTIONS"
+    "SOURCES"
+    ${ARGN})
+
+  set(CXX_COMPILER clang++)
+  if(MSVC)
+      set(CXX_COMPILER clang-cl.exe)
+  endif()
+  set(DEVICE_COMPILER_EXECUTABLE ${LLVM_RUNTIME_OUTPUT_INTDIR}/${CXX_COMPILER})
+
+  add_custom_target(${ARG_TARGET_NAME}_exec ALL
+    COMMAND ${DEVICE_COMPILER_EXECUTABLE} -fsycl ${ARG_OPTIONS} ${ARG_SOURCES}
+      -o ${CMAKE_CURRENT_BINARY_DIR}/${ARG_TARGET_NAME}
+    BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/${ARG_TARGET_NAME}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+  add_dependencies(${ARG_TARGET_NAME}_exec sycl clang)
+
+  add_executable(${ARG_TARGET_NAME} IMPORTED GLOBAL)
+  set_target_properties(${ARG_TARGET_NAME} PROPERTIES
+    IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR})
+endmacro()

sycl/examples/CMakeLists.txt

@@ -0,0 +1 @@
+add_sycl_executable(simple-dpcpp-app SOURCES simple-dpcpp-app.cpp)