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#===============================================================================
# Copyright 2017-2020 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(forbid_link_compiler_omp_rt)
if (NOT WIN32)
set_if(OpenMP_C_FOUND
CMAKE_C_CREATE_SHARED_LIBRARY_FORBIDDEN_FLAGS
"${OpenMP_C_FLAGS}")
set_if(OpenMP_CXX_FOUND
CMAKE_CXX_CREATE_SHARED_LIBRARY_FORBIDDEN_FLAGS
"${OpenMP_CXX_FLAGS}")
if (NOT APPLE)
append(CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
endif()
endif()
endmacro()
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()
find_package(OpenMP)
set_openmp_values_for_old_cmake()
# 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 STREQUAL "Clang" AND NOT DNNL_SYCL_DPCPP)
# 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_CXX_FOUND)
append(CMAKE_C_FLAGS ${OpenMP_C_FLAGS})
append(CMAKE_CXX_FLAGS ${OpenMP_CXX_FLAGS})
endif()
if(DNNL_CPU_THREADING_RUNTIME MATCHES "OMP")
if(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 linkage OpenMP dependency should be avoided
forbid_link_compiler_omp_rt()
return()
endif()
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