libomptarget/DeviceRTL/CMakeLists.txt - llvm-project/openmp - Git at Google

 ##===----------------------------------------------------------------------===##
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 ##===----------------------------------------------------------------------===##
 #
 # Build the DeviceRTL for all toolchains that are available
 #
 ##===----------------------------------------------------------------------===##

 set(LIBOMPTARGET_BUILD_DEVICERTL_BCLIB TRUE CACHE BOOL
   "Can be set to false to disable building this library.")

 if (NOT LIBOMPTARGET_BUILD_DEVICERTL_BCLIB)
   libomptarget_say("Not building DeviceRTL: Disabled by LIBOMPTARGET_BUILD_DEVICERTL_BCLIB")
   return()
 endif()

 # Check to ensure the host system is a supported host architecture.
 if(NOT ${CMAKE_SIZEOF_VOID_P} EQUAL "8")
   libomptarget_say("Not building DeviceRTL: Runtime does not support 32-bit hosts")
   return()
 endif()

 if (LLVM_DIR)
   # Builds that use pre-installed LLVM have LLVM_DIR set.
   # A standalone or LLVM_ENABLE_RUNTIMES=openmp build takes this route
   find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
   find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
     NO_DEFAULT_PATH)
   find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
   if ((NOT CLANG_TOOL) OR (NOT LINK_TOOL) OR (NOT OPT_TOOL))
     libomptarget_say("Not building DeviceRTL. Missing clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL} or opt: ${OPT_TOOL}")
     return()
   else()
     libomptarget_say("Building DeviceRTL. Using clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL} and opt: ${OPT_TOOL}")
   endif()
 elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
   # LLVM in-tree builds may use CMake target names to discover the tools.
   # A LLVM_ENABLE_PROJECTS=openmp build takes this route
   set(CLANG_TOOL $<TARGET_FILE:clang>)
   set(LINK_TOOL $<TARGET_FILE:llvm-link>)
   set(OPT_TOOL $<TARGET_FILE:opt>)
   libomptarget_say("Building DeviceRTL. Using clang from in-tree build")
 else()
   libomptarget_say("Not building DeviceRTL. No appropriate clang found")
   return()
 endif()

 set(devicertl_base_directory ${CMAKE_CURRENT_SOURCE_DIR})
 set(include_directory ${devicertl_base_directory}/include)
 set(source_directory ${devicertl_base_directory}/src)

 set(all_capabilities 35 37 50 52 53 60 61 62 70 72 75 80 86)

 set(LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES ${all_capabilities} CACHE STRING
   "List of CUDA Compute Capabilities to be used to compile the NVPTX DeviceRTL.")
 string(TOLOWER ${LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES} LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES)

 if (LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES STREQUAL "all")
   set(nvptx_sm_list ${all_capabilities})
 elseif(LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES STREQUAL "auto")
   if (NOT LIBOMPTARGET_DEP_CUDA_FOUND)
     libomptarget_error_say("[NVPTX] Cannot auto detect compute capability as CUDA not found.")
   endif()
   set(nvptx_sm_list ${LIBOMPTARGET_DEP_CUDA_ARCH})
 else()
   string(REPLACE "," ";" nvptx_sm_list "${LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES}")
 endif()

 # Check all SM values
 foreach(sm ${nvptx_sm_list})
   if (NOT ${sm} IN_LIST all_capabilities)
     libomptarget_warning_say("[NVPTX] Compute capability ${sm} is not supported. Make sure clang can work with it.")
   endif()
 endforeach()

 set(amdgpu_mcpus gfx700 gfx701 gfx801 gfx803 gfx900 gfx902 gfx906 gfx908 gfx90a gfx90c gfx940 gfx1010 gfx1030 gfx1031 gfx1032 gfx1033 gfx1034 gfx1035 gfx1036)
 if (DEFINED LIBOMPTARGET_AMDGCN_GFXLIST)
   set(amdgpu_mcpus ${LIBOMPTARGET_AMDGCN_GFXLIST})
 endif()

 # Activate RTL message dumps if requested by the user.
 set(LIBOMPTARGET_DEVICE_DEBUG FALSE CACHE BOOL
   "Activate DeviceRTL debug messages.")

 set(include_files
   ${include_directory}/Configuration.h
   ${include_directory}/Debug.h
   ${include_directory}/Interface.h
   ${include_directory}/LibC.h
   ${include_directory}/Mapping.h
   ${include_directory}/State.h
   ${include_directory}/Synchronization.h
   ${include_directory}/Types.h
   ${include_directory}/Utils.h
 )

 set(src_files
   ${source_directory}/Configuration.cpp
   ${source_directory}/Debug.cpp
   ${source_directory}/Kernel.cpp
   ${source_directory}/LibC.cpp
   ${source_directory}/Mapping.cpp
   ${source_directory}/Misc.cpp
   ${source_directory}/Parallelism.cpp
   ${source_directory}/Reduction.cpp
   ${source_directory}/State.cpp
   ${source_directory}/Synchronization.cpp
   ${source_directory}/Tasking.cpp
   ${source_directory}/Utils.cpp
   ${source_directory}/Workshare.cpp
 )

 set(clang_opt_flags -O3 -mllvm -openmp-opt-disable -DSHARED_SCRATCHPAD_SIZE=512)
 set(link_opt_flags  -O3        -openmp-opt-disable)
 set(link_export_flag -passes=internalize -internalize-public-api-file=${source_directory}/exports)

 # Prepend -I to each list element
 set (LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL "${LIBOMPTARGET_LLVM_INCLUDE_DIRS}")
 list(TRANSFORM LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL PREPEND "-I")

 # Set flags for LLVM Bitcode compilation.
 set(bc_flags -c -emit-llvm -std=c++17 -fvisibility=hidden
               ${clang_opt_flags} --offload-device-only
              -nocudalib -nogpulib -nostdinc
              -fopenmp -fopenmp-cuda-mode
              -I${include_directory}
              -I${devicertl_base_directory}/../include
              ${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
 )

 if(${LIBOMPTARGET_DEVICE_DEBUG})
   list(APPEND bc_flags -DOMPTARGET_DEBUG=-1)
 else()
   list(APPEND bc_flags -DOMPTARGET_DEBUG=0)
 endif()

 function(compileDeviceRTLLibrary target_cpu target_name)
   set(target_bc_flags ${ARGN})

   set(bc_files "")
   foreach(src ${src_files})
     get_filename_component(infile ${src} ABSOLUTE)
     get_filename_component(outfile ${src} NAME)
     set(outfile "${outfile}-${target_cpu}.bc")

     add_custom_command(OUTPUT ${outfile}
       COMMAND ${CLANG_TOOL}
       ${bc_flags}
       --offload-arch=${target_cpu}
       ${target_bc_flags}
       ${infile} -o ${outfile}
       DEPENDS ${infile} ${include_files}
       IMPLICIT_DEPENDS CXX ${infile}
       COMMENT "Building LLVM bitcode ${outfile}"
       VERBATIM
     )
     if("${CLANG_TOOL}" STREQUAL "$<TARGET_FILE:clang>")
       # Add a file-level dependency to ensure that clang is up-to-date.
       # By default, add_custom_command only builds clang if the
       # executable is missing.
       add_custom_command(OUTPUT ${outfile}
         DEPENDS clang
         APPEND
       )
     endif()
     set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${outfile})

     list(APPEND bc_files ${outfile})
   endforeach()

   set(bclib_name "libomptarget-${target_name}-${target_cpu}.bc")

   # Link to a bitcode library.
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
       COMMAND ${LINK_TOOL}
         -o ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name} ${bc_files}
       DEPENDS ${bc_files}
       COMMENT "Linking LLVM bitcode ${bclib_name}"
   )

   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
       COMMAND ${OPT_TOOL} ${link_export_flag} ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
                       -o ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
       DEPENDS ${source_directory}/exports ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
       COMMENT "Internalizing LLVM bitcode ${bclib_name}"
   )

   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
       COMMAND ${OPT_TOOL} ${link_opt_flags} ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
                       -o ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
       DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
       COMMENT "Optimizing LLVM bitcode ${bclib_name}"
   )

   # Add a file-level dependency to ensure that llvm-link and opt are up-to-date.
   # By default, add_custom_command only builds the tool if the executable is missing
   if("${LINK_TOOL}" STREQUAL "$<TARGET_FILE:llvm-link>")
     add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
       DEPENDS llvm-link
       APPEND)
   endif()
   if("${OPT_TOOL}" STREQUAL "$<TARGET_FILE:opt>")
     add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
       DEPENDS opt
       APPEND)
   endif()

   set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${bclib_name})

   set(bclib_target_name "omptarget-${target_name}-${target_cpu}-bc")

   add_custom_target(${bclib_target_name} ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name})

   # Copy library to destination.
   add_custom_command(TARGET ${bclib_target_name} POST_BUILD
                     COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
                     ${LIBOMPTARGET_LIBRARY_DIR})
   add_dependencies("omptarget.devicertl.${target_name}" "${bclib_target_name}")

   # Install bitcode library under the lib destination folder.
   install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name} DESTINATION "${OPENMP_INSTALL_LIBDIR}")
 endfunction()

 # Generate a Bitcode library for all the compute capabilities the user requested
 add_custom_target(omptarget.devicertl.nvptx)
 foreach(sm ${nvptx_sm_list})
   compileDeviceRTLLibrary(sm_${sm} nvptx -fopenmp-targets=nvptx64-nvidia-cuda -DLIBOMPTARGET_BC_TARGET --cuda-feature=+ptx61)
 endforeach()

 add_custom_target(omptarget.devicertl.amdgpu)
 foreach(mcpu ${amdgpu_mcpus})
   compileDeviceRTLLibrary(${mcpu} amdgpu -fopenmp-targets=amdgcn-amd-amdhsa -DLIBOMPTARGET_BC_TARGET -D__AMDGCN__ -nogpulib)
 endforeach()

 # Set the flags to build the device runtime from clang.
 set(clang_lib_flags -fopenmp -fopenmp-cuda-mode -foffload-lto -fvisibility=hidden -Xopenmp-target=nvptx64-nvidia-cuda --cuda-feature=+ptx61 -nocudalib -nogpulib -nostdinc ${clang_opt_flags})
 foreach(arch ${nvptx_sm_list})
   set(clang_lib_flags ${clang_lib_flags} --offload-arch=sm_${arch})
 endforeach()
 foreach(arch ${amdgpu_mcpus})
   set(clang_lib_flags ${clang_lib_flags} --offload-arch=${arch})
 endforeach()

 # Build the static library version of the device runtime.
 # first create an object target
 add_library(omptarget.devicertl.all_objs OBJECT IMPORTED)
 foreach(src ${src_files})
   get_filename_component(infile ${src} ABSOLUTE)
   get_filename_component(outfile ${src} NAME)
   set(outfile "${outfile}.o")
   set(outfile_full_path "${CMAKE_CURRENT_BINARY_DIR}/${outfile}")

   add_custom_command(OUTPUT ${outfile_full_path}
     COMMAND ${CLANG_TOOL} ${clang_lib_flags} --std=c++17 -c
             -o ${outfile_full_path}
             -I${include_directory}
             -I${devicertl_base_directory}/../include
             ${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
             ${infile}
     DEPENDS ${infile} ${include_files}
     IMPLICIT_DEPENDS CXX ${infile}
     COMMENT "Building device code ${outfile}"
     VERBATIM
   )
   if("${CLANG_TOOL}" STREQUAL "$<TARGET_FILE:clang>")
     # Add a file-level dependency to ensure that clang is up-to-date.
     # By default, add_custom_command only builds clang if the
     # executable is missing.
     add_custom_command(OUTPUT ${outfile_full_path}
       DEPENDS clang
       APPEND
     )
   endif()
   set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${outfile_full_path})

   set_property(TARGET omptarget.devicertl.all_objs APPEND PROPERTY IMPORTED_OBJECTS ${outfile_full_path})
 endforeach()

 # second archive all the object files into a static library
 add_library(omptarget.devicertl STATIC)
 set_target_properties(omptarget.devicertl PROPERTIES LINKER_LANGUAGE CXX)
 target_link_libraries(omptarget.devicertl PRIVATE omptarget.devicertl.all_objs)

 install(TARGETS omptarget.devicertl ARCHIVE DESTINATION ${OPENMP_INSTALL_LIBDIR})
	##===----------------------------------------------------------------------===##
	#
	# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	# See https://llvm.org/LICENSE.txt for license information.
	# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	#
	##===----------------------------------------------------------------------===##
	#
	# Build the DeviceRTL for all toolchains that are available
	#
	##===----------------------------------------------------------------------===##

	set(LIBOMPTARGET_BUILD_DEVICERTL_BCLIB TRUE CACHE BOOL
	"Can be set to false to disable building this library.")

	if (NOT LIBOMPTARGET_BUILD_DEVICERTL_BCLIB)
	libomptarget_say("Not building DeviceRTL: Disabled by LIBOMPTARGET_BUILD_DEVICERTL_BCLIB")
	return()
	endif()

	# Check to ensure the host system is a supported host architecture.
	if(NOT ${CMAKE_SIZEOF_VOID_P} EQUAL "8")
	libomptarget_say("Not building DeviceRTL: Runtime does not support 32-bit hosts")
	return()
	endif()

	if (LLVM_DIR)
	# Builds that use pre-installed LLVM have LLVM_DIR set.
	# A standalone or LLVM_ENABLE_RUNTIMES=openmp build takes this route
	find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
	find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
	NO_DEFAULT_PATH)
	find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
	if ((NOT CLANG_TOOL) OR (NOT LINK_TOOL) OR (NOT OPT_TOOL))
	libomptarget_say("Not building DeviceRTL. Missing clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL} or opt: ${OPT_TOOL}")
	return()
	else()
	libomptarget_say("Building DeviceRTL. Using clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL} and opt: ${OPT_TOOL}")
	endif()
	elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
	# LLVM in-tree builds may use CMake target names to discover the tools.
	# A LLVM_ENABLE_PROJECTS=openmp build takes this route
	set(CLANG_TOOL $<TARGET_FILE:clang>)
	set(LINK_TOOL $<TARGET_FILE:llvm-link>)
	set(OPT_TOOL $<TARGET_FILE:opt>)
	libomptarget_say("Building DeviceRTL. Using clang from in-tree build")
	else()
	libomptarget_say("Not building DeviceRTL. No appropriate clang found")
	return()
	endif()

	set(devicertl_base_directory ${CMAKE_CURRENT_SOURCE_DIR})
	set(include_directory ${devicertl_base_directory}/include)
	set(source_directory ${devicertl_base_directory}/src)

	set(all_capabilities 35 37 50 52 53 60 61 62 70 72 75 80 86)

	set(LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES ${all_capabilities} CACHE STRING
	"List of CUDA Compute Capabilities to be used to compile the NVPTX DeviceRTL.")
	string(TOLOWER ${LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES} LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES)

	if (LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES STREQUAL "all")
	set(nvptx_sm_list ${all_capabilities})
	elseif(LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES STREQUAL "auto")
	if (NOT LIBOMPTARGET_DEP_CUDA_FOUND)
	libomptarget_error_say("[NVPTX] Cannot auto detect compute capability as CUDA not found.")
	endif()
	set(nvptx_sm_list ${LIBOMPTARGET_DEP_CUDA_ARCH})
	else()
	string(REPLACE "," ";" nvptx_sm_list "${LIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES}")
	endif()

	# Check all SM values
	foreach(sm ${nvptx_sm_list})
	if (NOT ${sm} IN_LIST all_capabilities)
	libomptarget_warning_say("[NVPTX] Compute capability ${sm} is not supported. Make sure clang can work with it.")
	endif()
	endforeach()

	set(amdgpu_mcpus gfx700 gfx701 gfx801 gfx803 gfx900 gfx902 gfx906 gfx908 gfx90a gfx90c gfx940 gfx1010 gfx1030 gfx1031 gfx1032 gfx1033 gfx1034 gfx1035 gfx1036)
	if (DEFINED LIBOMPTARGET_AMDGCN_GFXLIST)
	set(amdgpu_mcpus ${LIBOMPTARGET_AMDGCN_GFXLIST})
	endif()

	# Activate RTL message dumps if requested by the user.
	set(LIBOMPTARGET_DEVICE_DEBUG FALSE CACHE BOOL
	"Activate DeviceRTL debug messages.")

	set(include_files
	${include_directory}/Configuration.h
	${include_directory}/Debug.h
	${include_directory}/Interface.h
	${include_directory}/LibC.h
	${include_directory}/Mapping.h
	${include_directory}/State.h
	${include_directory}/Synchronization.h
	${include_directory}/Types.h
	${include_directory}/Utils.h
	)

	set(src_files
	${source_directory}/Configuration.cpp
	${source_directory}/Debug.cpp
	${source_directory}/Kernel.cpp
	${source_directory}/LibC.cpp
	${source_directory}/Mapping.cpp
	${source_directory}/Misc.cpp
	${source_directory}/Parallelism.cpp
	${source_directory}/Reduction.cpp
	${source_directory}/State.cpp
	${source_directory}/Synchronization.cpp
	${source_directory}/Tasking.cpp
	${source_directory}/Utils.cpp
	${source_directory}/Workshare.cpp
	)

	set(clang_opt_flags -O3 -mllvm -openmp-opt-disable -DSHARED_SCRATCHPAD_SIZE=512)
	set(link_opt_flags -O3 -openmp-opt-disable)
	set(link_export_flag -passes=internalize -internalize-public-api-file=${source_directory}/exports)

	# Prepend -I to each list element
	set (LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL "${LIBOMPTARGET_LLVM_INCLUDE_DIRS}")
	list(TRANSFORM LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL PREPEND "-I")

	# Set flags for LLVM Bitcode compilation.
	set(bc_flags -c -emit-llvm -std=c++17 -fvisibility=hidden
	${clang_opt_flags} --offload-device-only
	-nocudalib -nogpulib -nostdinc
	-fopenmp -fopenmp-cuda-mode
	-I${include_directory}
	-I${devicertl_base_directory}/../include
	${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
	)

	if(${LIBOMPTARGET_DEVICE_DEBUG})
	list(APPEND bc_flags -DOMPTARGET_DEBUG=-1)
	else()
	list(APPEND bc_flags -DOMPTARGET_DEBUG=0)
	endif()

	function(compileDeviceRTLLibrary target_cpu target_name)
	set(target_bc_flags ${ARGN})

	set(bc_files "")
	foreach(src ${src_files})
	get_filename_component(infile ${src} ABSOLUTE)
	get_filename_component(outfile ${src} NAME)
	set(outfile "${outfile}-${target_cpu}.bc")

	add_custom_command(OUTPUT ${outfile}
	COMMAND ${CLANG_TOOL}
	${bc_flags}
	--offload-arch=${target_cpu}
	${target_bc_flags}
	${infile} -o ${outfile}
	DEPENDS ${infile} ${include_files}
	IMPLICIT_DEPENDS CXX ${infile}
	COMMENT "Building LLVM bitcode ${outfile}"
	VERBATIM
	)
	if("${CLANG_TOOL}" STREQUAL "$<TARGET_FILE:clang>")
	# Add a file-level dependency to ensure that clang is up-to-date.
	# By default, add_custom_command only builds clang if the
	# executable is missing.
	add_custom_command(OUTPUT ${outfile}
	DEPENDS clang
	APPEND
	)
	endif()
	set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${outfile})

	list(APPEND bc_files ${outfile})
	endforeach()

	set(bclib_name "libomptarget-${target_name}-${target_cpu}.bc")

	# Link to a bitcode library.
	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
	COMMAND ${LINK_TOOL}
	-o ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name} ${bc_files}
	DEPENDS ${bc_files}
	COMMENT "Linking LLVM bitcode ${bclib_name}"
	)

	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
	COMMAND ${OPT_TOOL} ${link_export_flag} ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
	-o ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
	DEPENDS ${source_directory}/exports ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
	COMMENT "Internalizing LLVM bitcode ${bclib_name}"
	)

	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
	COMMAND ${OPT_TOOL} ${link_opt_flags} ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
	-o ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
	DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
	COMMENT "Optimizing LLVM bitcode ${bclib_name}"
	)

	# Add a file-level dependency to ensure that llvm-link and opt are up-to-date.
	# By default, add_custom_command only builds the tool if the executable is missing
	if("${LINK_TOOL}" STREQUAL "$<TARGET_FILE:llvm-link>")
	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
	DEPENDS llvm-link
	APPEND)
	endif()
	if("${OPT_TOOL}" STREQUAL "$<TARGET_FILE:opt>")
	add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
	DEPENDS opt
	APPEND)
	endif()

	set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${bclib_name})

	set(bclib_target_name "omptarget-${target_name}-${target_cpu}-bc")

	add_custom_target(${bclib_target_name} ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name})

	# Copy library to destination.
	add_custom_command(TARGET ${bclib_target_name} POST_BUILD
	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
	${LIBOMPTARGET_LIBRARY_DIR})
	add_dependencies("omptarget.devicertl.${target_name}" "${bclib_target_name}")

	# Install bitcode library under the lib destination folder.
	install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name} DESTINATION "${OPENMP_INSTALL_LIBDIR}")
	endfunction()

	# Generate a Bitcode library for all the compute capabilities the user requested
	add_custom_target(omptarget.devicertl.nvptx)
	foreach(sm ${nvptx_sm_list})
	compileDeviceRTLLibrary(sm_${sm} nvptx -fopenmp-targets=nvptx64-nvidia-cuda -DLIBOMPTARGET_BC_TARGET --cuda-feature=+ptx61)
	endforeach()

	add_custom_target(omptarget.devicertl.amdgpu)
	foreach(mcpu ${amdgpu_mcpus})
	compileDeviceRTLLibrary(${mcpu} amdgpu -fopenmp-targets=amdgcn-amd-amdhsa -DLIBOMPTARGET_BC_TARGET -D__AMDGCN__ -nogpulib)
	endforeach()

	# Set the flags to build the device runtime from clang.
	set(clang_lib_flags -fopenmp -fopenmp-cuda-mode -foffload-lto -fvisibility=hidden -Xopenmp-target=nvptx64-nvidia-cuda --cuda-feature=+ptx61 -nocudalib -nogpulib -nostdinc ${clang_opt_flags})
	foreach(arch ${nvptx_sm_list})
	set(clang_lib_flags ${clang_lib_flags} --offload-arch=sm_${arch})
	endforeach()
	foreach(arch ${amdgpu_mcpus})
	set(clang_lib_flags ${clang_lib_flags} --offload-arch=${arch})
	endforeach()

	# Build the static library version of the device runtime.
	# first create an object target
	add_library(omptarget.devicertl.all_objs OBJECT IMPORTED)
	foreach(src ${src_files})
	get_filename_component(infile ${src} ABSOLUTE)
	get_filename_component(outfile ${src} NAME)
	set(outfile "${outfile}.o")
	set(outfile_full_path "${CMAKE_CURRENT_BINARY_DIR}/${outfile}")

	add_custom_command(OUTPUT ${outfile_full_path}
	COMMAND ${CLANG_TOOL} ${clang_lib_flags} --std=c++17 -c
	-o ${outfile_full_path}
	-I${include_directory}
	-I${devicertl_base_directory}/../include
	${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
	${infile}
	DEPENDS ${infile} ${include_files}
	IMPLICIT_DEPENDS CXX ${infile}
	COMMENT "Building device code ${outfile}"
	VERBATIM
	)
	if("${CLANG_TOOL}" STREQUAL "$<TARGET_FILE:clang>")
	# Add a file-level dependency to ensure that clang is up-to-date.
	# By default, add_custom_command only builds clang if the
	# executable is missing.
	add_custom_command(OUTPUT ${outfile_full_path}
	DEPENDS clang
	APPEND
	)
	endif()
	set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${outfile_full_path})

	set_property(TARGET omptarget.devicertl.all_objs APPEND PROPERTY IMPORTED_OBJECTS ${outfile_full_path})
	endforeach()

	# second archive all the object files into a static library
	add_library(omptarget.devicertl STATIC)
	set_target_properties(omptarget.devicertl PROPERTIES LINKER_LANGUAGE CXX)
	target_link_libraries(omptarget.devicertl PRIVATE omptarget.devicertl.all_objs)

	install(TARGETS omptarget.devicertl ARCHIVE DESTINATION ${OPENMP_INSTALL_LIBDIR})