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OpenMP.cmake
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OpenMP.cmake
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#===============================================================================
# Copyright 2017-2024 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#===============================================================================
# Manage OpenMP-related compiler flags
#===============================================================================
if(OpenMP_cmake_included)
return()
endif()
set(OpenMP_cmake_included true)
include("cmake/Threading.cmake")
if (APPLE AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# OSX Clang doesn't have OpenMP by default.
# But we still want to build the library.
set(_omp_severity "WARNING")
else()
set(_omp_severity "FATAL_ERROR")
endif()
macro(set_openmp_values_for_old_cmake)
#newer version for findOpenMP (>= v. 3.9)
if(CMAKE_VERSION VERSION_LESS "3.9" AND OPENMP_FOUND)
if(${CMAKE_MAJOR_VERSION} VERSION_LESS "3" AND ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
# Override FindOpenMP flags for Intel Compiler (otherwise deprecated)
set(OpenMP_CXX_FLAGS "-fopenmp")
set(OpenMP_C_FLAGS "-fopenmp")
endif()
set(OpenMP_C_FOUND true)
set(OpenMP_CXX_FOUND true)
endif()
endmacro()
if(DPCPP_HOST_COMPILER_KIND STREQUAL "DEFAULT")
# XXX: workaround: when -fsycl is specified the compiler doesn't define
# _OPENMP macro causing `find_package(OpenMP)` to fail.
# Use -fno-sycl option to disable SYCL. The rationale: dpcpp driver sets
# the -fsycl option by default so it has to be explicitly disabled.
set(_omp_original_cmake_cxx_flags "${CMAKE_CXX_FLAGS}")
string(REGEX REPLACE "-fsycl" "-fno-sycl" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
find_package(OpenMP)
set_openmp_values_for_old_cmake()
set(CMAKE_CXX_FLAGS "${_omp_original_cmake_cxx_flags}")
endif()
# special case for clang-cl (not recognized by cmake up to 3.17)
if(NOT OpenMP_CXX_FOUND AND MSVC AND CMAKE_CXX_COMPILER_ID MATCHES "(Clang|IntelLLVM)")
# clang-cl and icx will fall under this condition
# CAVEAT: undocumented variable, may be inappropriate
if(CMAKE_BASE_NAME STREQUAL "icx")
# XXX: Use `-Xclang --dependent-lib=libiomp5md` to workaround an issue
# with linking OpenMP on Windows.
# The ICX driver doesn't link OpenMP library even if `/Qopenmp`
# was specified.
set(OpenMP_FLAGS "/Qopenmp -Xclang --dependent-lib=libiomp5md")
else()
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "10.0")
# version < 10 can't pass cl-style `/openmp` flag
set(OpenMP_FLAGS "-Xclang -fopenmp")
# ... and requires explicit linking against omp library
set(OpenMP_CXX_LIBRARIES "libomp.lib")
endif()
endif()
set(OpenMP_C_FLAGS ${OpenMP_FLAGS})
set(OpenMP_CXX_FLAGS ${OpenMP_FLAGS})
set(OpenMP_CXX_FOUND true)
endif()
# add flags unconditionally to always utilize openmp-simd for any threading runtime
if(OpenMP_C_FOUND)
append(CMAKE_C_FLAGS ${OpenMP_C_FLAGS})
endif()
if(OpenMP_CXX_FOUND)
append(CMAKE_CXX_FLAGS ${OpenMP_CXX_FLAGS})
endif()
if(DNNL_CPU_THREADING_RUNTIME MATCHES "OMP")
if(DPCPP_HOST_COMPILER_KIND STREQUAL "")
message(FATAL_ERROR "DPCPP_HOST_COMPILER_KIND is undefined. Please make sure that a host compiler identification is performed before this point.")
endif()
if(DNNL_WITH_SYCL AND DPCPP_HOST_COMPILER_KIND STREQUAL "GNU")
# Tell DPCPP compiler to link against libgomp. By default, it links
# against libiomp5
append(CMAKE_SHARED_LINKER_FLAGS "-fopenmp=libgomp")
append(CMAKE_EXE_LINKER_FLAGS "-fopenmp=libgomp")
elseif(DNNL_WITH_SYCL AND DPCPP_HOST_COMPILER_KIND STREQUAL "CLANG")
append(CMAKE_SHARED_LINKER_FLAGS "-fopenmp")
append(CMAKE_EXE_LINKER_FLAGS "-fopenmp")
elseif(OpenMP_CXX_FOUND)
if(MSVC AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
list(APPEND EXTRA_SHARED_LIBS ${OpenMP_CXX_LIBRARIES})
endif()
else()
message(${_omp_severity} "OpenMP library could not be found. "
"Proceeding might lead to highly sub-optimal performance.")
# Override CPU threading to sequential if allowed to proceed
set(DNNL_CPU_THREADING_RUNTIME "SEQ")
endif()
else()
# Compilation happens with OpenMP to enable `#pragma omp simd`
# but during shared objects and executables linkage OpenMP dependency should
# be avoided.
if (NOT WIN32 AND NOT APPLE)
append(CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
append(CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed")
endif()
endif()