# See for https://openmp.llvm.org/SupportAndFAQ.html for instructions on how
# to build offload with CMake.
cmake_minimum_required(VERSION 3.20.0)
set(LLVM_SUBPROJECT_TITLE "liboffload")
if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
set(OPENMP_STANDALONE_BUILD TRUE)
project(offload C CXX ASM)
else()
set(OPENMP_STANDALONE_BUILD FALSE)
endif()
# Check that the library can actually be built.
if(APPLE OR WIN32 OR WASM)
message(WARNING "libomptarget cannot be built on Windows and MacOS X!")
return()
elseif(NOT "cxx_std_17" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
message(WARNING "Host compiler must support C++17 to build libomptarget!")
return()
elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
message(WARNING "libomptarget on 32-bit systems is not supported!")
return()
endif()
if(OPENMP_STANDALONE_BUILD)
set(OFFLOAD_LIBDIR_SUFFIX "" CACHE STRING
"Suffix of lib installation directory, e.g. 64 => lib64")
set(OFFLOAD_INSTALL_LIBDIR "lib${OFFLOAD_LIBDIR_SUFFIX}" CACHE STRING
"Path where built offload libraries should be installed.")
else()
# When building in tree we install the runtime according to the LLVM settings.
if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
set(OFFLOAD_INSTALL_LIBDIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE STRING
"Path where built offload libraries should be installed.")
else()
set(OFFLOAD_INSTALL_LIBDIR "lib${LLVM_LIBDIR_SUFFIX}" CACHE STRING
"Path where built offload libraries should be installed.")
endif()
endif()
set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
# Add path for custom modules
list(INSERT CMAKE_MODULE_PATH 0
"${CMAKE_CURRENT_SOURCE_DIR}/cmake"
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
"${LLVM_COMMON_CMAKE_UTILS}/Modules"
)
if (OPENMP_STANDALONE_BUILD)
# CMAKE_BUILD_TYPE was not set, default to Release.
if (NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Release)
endif()
# Group common settings.
set(OPENMP_ENABLE_WERROR FALSE CACHE BOOL
"Enable -Werror flags to turn warnings into errors for supporting compilers.")
set(OPENMP_LIBDIR_SUFFIX "" CACHE STRING
"Suffix of lib installation directory, e.g. 64 => lib64")
# Do not use OPENMP_LIBDIR_SUFFIX directly, use OPENMP_INSTALL_LIBDIR.
set(OPENMP_INSTALL_LIBDIR "lib${OPENMP_LIBDIR_SUFFIX}")
# Group test settings.
set(OPENMP_TEST_C_COMPILER ${CMAKE_C_COMPILER} CACHE STRING
"C compiler to use for testing OpenMP runtime libraries.")
set(OPENMP_TEST_CXX_COMPILER ${CMAKE_CXX_COMPILER} CACHE STRING
"C++ compiler to use for testing OpenMP runtime libraries.")
set(OPENMP_TEST_Fortran_COMPILER ${CMAKE_Fortran_COMPILER} CACHE STRING
"FORTRAN compiler to use for testing OpenMP runtime libraries.")
set(OPENMP_LLVM_TOOLS_DIR "" CACHE PATH "Path to LLVM tools for testing.")
set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to conform to")
set(CMAKE_CXX_STANDARD_REQUIRED NO)
set(CMAKE_CXX_EXTENSIONS NO)
else()
set(OPENMP_ENABLE_WERROR ${LLVM_ENABLE_WERROR})
# If building in tree, we honor the same install suffix LLVM uses.
set(OPENMP_INSTALL_LIBDIR "lib${LLVM_LIBDIR_SUFFIX}")
if (NOT MSVC)
set(OPENMP_TEST_C_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)
set(OPENMP_TEST_CXX_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++)
else()
set(OPENMP_TEST_C_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang.exe)
set(OPENMP_TEST_CXX_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang++.exe)
endif()
# Check for flang
if (NOT MSVC)
set(OPENMP_TEST_Fortran_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/flang-new)
else()
set(OPENMP_TEST_Fortran_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/flang-new.exe)
endif()
# Set fortran test compiler if flang is found
if (EXISTS "${OPENMP_TEST_Fortran_COMPILER}")
message("Using local flang build at ${OPENMP_TEST_Fortran_COMPILER}")
else()
unset(OPENMP_TEST_Fortran_COMPILER)
endif()
# If not standalone, set CMAKE_CXX_STANDARD but don't set the global cache value,
# only set it locally for OpenMP.
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED NO)
set(CMAKE_CXX_EXTENSIONS NO)
endif()
# Set the path of all resulting libraries to a unified location so that it can
# be used for testing.
set(LIBOMPTARGET_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBOMPTARGET_LIBRARY_DIR})
if(NOT LLVM_LIBRARY_OUTPUT_INTDIR)
set(LIBOMPTARGET_INTDIR ${LIBOMPTARGET_LIBRARY_DIR})
else()
set(LIBOMPTARGET_INTDIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
endif()
# Get dependencies for the different components of the project.
include(LibomptargetGetDependencies)
# Set up testing infrastructure.
include(OpenMPTesting)
check_cxx_compiler_flag(-Werror=global-constructors OFFLOAD_HAVE_WERROR_CTOR)
# LLVM source tree is required at build time for libomptarget
if (NOT LIBOMPTARGET_LLVM_INCLUDE_DIRS)
message(FATAL_ERROR "Missing definition for LIBOMPTARGET_LLVM_INCLUDE_DIRS")
endif()
if(DEFINED LIBOMPTARGET_BUILD_CUDA_PLUGIN OR
DEFINED LIBOMPTARGET_BUILD_AMDGPU_PLUGIN)
message(WARNING "Option removed, use 'LIBOMPTARGET_PLUGINS_TO_BUILD' instead")
endif()
set(LIBOMPTARGET_ALL_PLUGIN_TARGETS amdgpu cuda host)
set(LIBOMPTARGET_PLUGINS_TO_BUILD "all" CACHE STRING
"Semicolon-separated list of plugins to use: cuda, amdgpu, host or \"all\".")
if(LIBOMPTARGET_PLUGINS_TO_BUILD STREQUAL "all")
set(LIBOMPTARGET_PLUGINS_TO_BUILD ${LIBOMPTARGET_ALL_PLUGIN_TARGETS})
endif()
if(NOT CMAKE_SYSTEM_NAME MATCHES "Linux" AND
"host" IN_LIST LIBOMPTARGET_PLUGINS_TO_BUILD)
message(STATUS "Not building host plugin: only Linux systems are supported")
list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "host")
endif()
if(NOT (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(ppc64le)|(aarch64)$"
AND CMAKE_SYSTEM_NAME MATCHES "Linux"))
if("amdgpu" IN_LIST LIBOMPTARGET_PLUGINS_TO_BUILD)
message(STATUS "Not building AMDGPU plugin: only support AMDGPU in "
"Linux x86_64, ppc64le, or aarch64 hosts")
list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "amdgpu")
endif()
if("cuda" IN_LIST LIBOMPTARGET_PLUGINS_TO_BUILD)
message(STATUS "Not building CUDA plugin: only support CUDA in "
"Linux x86_64, ppc64le, or aarch64 hosts")
list(REMOVE_ITEM LIBOMPTARGET_PLUGINS_TO_BUILD "cuda")
endif()
endif()
message(STATUS "Building the offload library with support for "
"the \"${LIBOMPTARGET_PLUGINS_TO_BUILD}\" plugins")
set(LIBOMPTARGET_DLOPEN_PLUGINS "${LIBOMPTARGET_PLUGINS_TO_BUILD}" CACHE STRING
"Semicolon-separated list of plugins to use 'dlopen' for runtime linking")
set(LIBOMPTARGET_ENUM_PLUGIN_TARGETS "")
foreach(plugin IN LISTS LIBOMPTARGET_PLUGINS_TO_BUILD)
set(LIBOMPTARGET_ENUM_PLUGIN_TARGETS
"${LIBOMPTARGET_ENUM_PLUGIN_TARGETS}PLUGIN_TARGET(${plugin})\n")
endforeach()
string(STRIP ${LIBOMPTARGET_ENUM_PLUGIN_TARGETS} LIBOMPTARGET_ENUM_PLUGIN_TARGETS)
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/include/Shared/Targets.def.in
${CMAKE_CURRENT_BINARY_DIR}/include/Shared/Targets.def
)
include_directories(${LIBOMPTARGET_LLVM_INCLUDE_DIRS})
# This is a list of all the targets that are supported/tested right now.
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} aarch64-unknown-linux-gnu")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} aarch64-unknown-linux-gnu-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} amdgcn-amd-amdhsa")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} powerpc64le-ibm-linux-gnu")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} powerpc64le-ibm-linux-gnu-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} powerpc64-ibm-linux-gnu")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} powerpc64-ibm-linux-gnu-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} x86_64-unknown-linux-gnu")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} x86_64-unknown-linux-gnu-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} nvptx64-nvidia-cuda")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} nvptx64-nvidia-cuda-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} nvptx64-nvidia-cuda-JIT-LTO")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} s390x-ibm-linux-gnu")
set (LIBOMPTARGET_ALL_TARGETS "${LIBOMPTARGET_ALL_TARGETS} s390x-ibm-linux-gnu-LTO")
# Once the plugins for the different targets are validated, they will be added to
# the list of supported targets in the current system.
set (LIBOMPTARGET_SYSTEM_TARGETS "")
set (LIBOMPTARGET_TESTED_PLUGINS "")
# Check whether using debug mode. In debug mode, allow dumping progress
# messages at runtime by default. Otherwise, it can be enabled
# independently using the LIBOMPTARGET_ENABLE_DEBUG option.
string( TOLOWER "${CMAKE_BUILD_TYPE}" LIBOMPTARGET_CMAKE_BUILD_TYPE)
if(LIBOMPTARGET_CMAKE_BUILD_TYPE MATCHES debug)
option(LIBOMPTARGET_ENABLE_DEBUG "Allow debug output with the environment variable LIBOMPTARGET_DEBUG=1" ON)
else()
option(LIBOMPTARGET_ENABLE_DEBUG "Allow debug output with the environment variable LIBOMPTARGET_DEBUG=1" OFF)
endif()
if(LIBOMPTARGET_ENABLE_DEBUG)
add_definitions(-DOMPTARGET_DEBUG)
endif()
# No exceptions and no RTTI, except if requested.
set(offload_compile_flags -fno-exceptions)
if(NOT LLVM_ENABLE_RTTI)
set(offload_compile_flags ${offload_compile_flags} -fno-rtti)
endif()
if(OFFLOAD_HAVE_WERROR_CTOR)
list(APPEND offload_compile_flags -Werror=global-constructors)
endif()
# TODO: Consider enabling LTO by default if supported.
# https://cmake.org/cmake/help/latest/module/CheckIPOSupported.html can be used
# to test for working LTO. However, before CMake 3.24 this will test the
# default linker and ignore options such as LLVM_ENABLE_LLD. As a result, CMake
# would test whether LTO works with the default linker but build with another one.
# In a typical scenario, libomptarget is compiled with the in-tree Clang, but
# linked with ld.gold, which requires the LLVMgold plugin, when it actually
# would work with the lld linker (or also fail because the system lld is too old
# to understand opaque pointers). Using gcc as the compiler would pass the test, but fail
# when linking with lld since does not understand gcc's LTO format.
set(LIBOMPTARGET_USE_LTO FALSE CACHE BOOL "Use LTO for the offload runtimes if available")
if (LIBOMPTARGET_USE_LTO)
# CMake sets CMAKE_CXX_COMPILE_OPTIONS_IPO depending on the compiler and is
# also what CheckIPOSupported uses to test support.
list(APPEND offload_compile_flags ${CMAKE_CXX_COMPILE_OPTIONS_IPO})
list(APPEND offload_link_flags ${CMAKE_CXX_COMPILE_OPTIONS_IPO})
endif()
if(OPENMP_STANDALONE_BUILD)
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
execute_process(
OUTPUT_STRIP_TRAILING_WHITESPACE
COMMAND ${CMAKE_CXX_COMPILER} --print-resource-dir
RESULT_VARIABLE COMMAND_RETURN_CODE
OUTPUT_VARIABLE COMPILER_RESOURCE_DIR
)
endif()
set(LIBOMP_HAVE_OMPT_SUPPORT FALSE)
set(LIBOMP_OMPT_SUPPORT FALSE)
find_path (
LIBOMP_OMP_TOOLS_INCLUDE_DIR
NAMES
omp-tools.h
HINTS
${COMPILER_RESOURCE_DIR}/include
${CMAKE_INSTALL_PREFIX}/include
)
if(LIBOMP_OMP_TOOLS_INCLUDE_DIR)
set(LIBOMP_HAVE_OMPT_SUPPORT TRUE)
set(LIBOMP_OMPT_SUPPORT TRUE)
endif()
# LLVM_LIBRARY_DIRS set by find_package(LLVM) in LibomptargetGetDependencies
find_library (
LIBOMP_STANDALONE
NAMES
omp
HINTS
${CMAKE_INSTALL_PREFIX}/lib
${LLVM_LIBRARY_DIRS}
REQUIRED
)
endif()
macro(pythonize_bool var)
if (${var})
set(${var} True)
else()
set(${var} False)
endif()
endmacro()
if(OPENMP_STANDALONE_BUILD OR TARGET omp)
# Check LIBOMP_HAVE_VERSION_SCRIPT_FLAG
include(LLVMCheckCompilerLinkerFlag)
if(NOT APPLE)
llvm_check_compiler_linker_flag(C "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/../openmp/runtime/src/exports_test_so.txt" LIBOMP_HAVE_VERSION_SCRIPT_FLAG)
endif()
endif()
# OMPT support for libomptarget
# Follow host OMPT support and check if host support has been requested.
# LIBOMP_HAVE_OMPT_SUPPORT indicates whether host OMPT support has been implemented.
# LIBOMP_OMPT_SUPPORT indicates whether host OMPT support has been requested (default is ON).
# LIBOMPTARGET_OMPT_SUPPORT indicates whether target OMPT support has been requested (default is ON).
set(OMPT_TARGET_DEFAULT FALSE)
if ((LIBOMP_HAVE_OMPT_SUPPORT) AND (LIBOMP_OMPT_SUPPORT) AND (NOT WIN32))
set (OMPT_TARGET_DEFAULT TRUE)
endif()
set(LIBOMPTARGET_OMPT_SUPPORT ${OMPT_TARGET_DEFAULT} CACHE BOOL "OMPT-target-support?")
if ((OMPT_TARGET_DEFAULT) AND (LIBOMPTARGET_OMPT_SUPPORT))
add_definitions(-DOMPT_SUPPORT=1)
message(STATUS "OMPT target enabled")
else()
set(LIBOMPTARGET_OMPT_SUPPORT FALSE)
message(STATUS "OMPT target disabled")
endif()
pythonize_bool(LIBOMPTARGET_OMPT_SUPPORT)
if(${LLVM_LIBC_GPU_BUILD})
set(LIBOMPTARGET_HAS_LIBC TRUE)
else()
set(LIBOMPTARGET_HAS_LIBC FALSE)
endif()
set(LIBOMPTARGET_GPU_LIBC_SUPPORT ${LIBOMPTARGET_HAS_LIBC} CACHE BOOL
"Libomptarget support for the GPU libc")
pythonize_bool(LIBOMPTARGET_GPU_LIBC_SUPPORT)
set(LIBOMPTARGET_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
set(LIBOMPTARGET_BINARY_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/include)
message(STATUS "OpenMP tools dir in libomptarget: ${LIBOMP_OMP_TOOLS_INCLUDE_DIR}")
if(LIBOMP_OMP_TOOLS_INCLUDE_DIR)
include_directories(${LIBOMP_OMP_TOOLS_INCLUDE_DIR})
endif()
set(LIBOMPTARGET_LLVM_LIBRARY_DIR "${LLVM_LIBRARY_DIR}" CACHE STRING
"Path to folder containing llvm library libomptarget.so")
set(LIBOMPTARGET_LLVM_LIBRARY_INTDIR "${LIBOMPTARGET_INTDIR}" CACHE STRING
"Path to folder where intermediate libraries will be output")
# Build offloading plugins and device RTLs if they are available.
add_subdirectory(plugins-nextgen)
add_subdirectory(DeviceRTL)
add_subdirectory(tools)
# Build target agnostic offloading library.
add_subdirectory(src)
# Add tests.
add_subdirectory(test)
# Add unit tests if GMock/GTest is present
if (EXISTS ${LLVM_THIRD_PARTY_DIR}/unittest)
if (NOT TARGET llvm_gtest)
add_subdirectory(${LLVM_THIRD_PARTY_DIR}/unittest ${CMAKE_CURRENT_BINARY_DIR}/third-party/unittest)
endif()
add_subdirectory(unittests)
endif()
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