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-#.rst:
-# FindOpenMP
-# ----------
-#
-# Finds OpenMP support
-#
-# This module can be used to detect OpenMP support in a compiler. If
-# the compiler supports OpenMP, the flags required to compile with
-# OpenMP support are returned in variables for the different languages.
-# The variables may be empty if the compiler does not need a special
-# flag to support OpenMP.
-#
-# The following variables are set:
-#
-# ::
-#
-# OpenMP_C_FLAGS - flags to add to the C compiler for OpenMP support
-# OpenMP_CXX_FLAGS - flags to add to the CXX compiler for OpenMP support
-# OpenMP_Fortran_FLAGS - flags to add to the Fortran compiler for OpenMP support
-# OPENMP_FOUND - true if openmp is detected
-#
-#
-#
-# Supported compilers can be found at
-# http://openmp.org/wp/openmp-compilers/
-
-#=============================================================================
-# Copyright 2009 Kitware, Inc.
-# Copyright 2008-2009 André Rigland Brodtkorb <Andre.Brodtkorb@ifi.uio.no>
-# Copyright 2012 Rolf Eike Beer <eike@sf-mail.de>
-# Copyright 2014 Nicolas Bock <nicolasbock@gmail.com>
-#
-# Distributed under the OSI-approved BSD License (the "License");
-# see accompanying file Copyright.txt for details.
-#
-# This software is distributed WITHOUT ANY WARRANTY; without even the
-# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-# See the License for more information.
-#=============================================================================
-# (To distribute this file outside of CMake, substitute the full
-# License text for the above reference.)
-
-set(_OPENMP_REQUIRED_VARS)
-set(CMAKE_REQUIRED_QUIET_SAVE ${CMAKE_REQUIRED_QUIET})
-set(CMAKE_REQUIRED_QUIET ${OpenMP_FIND_QUIETLY})
-
-function(_OPENMP_FLAG_CANDIDATES LANG)
- set(OpenMP_FLAG_CANDIDATES
- #Empty, if compiler automatically accepts openmp
- " "
- #GNU
- "-fopenmp"
- #Microsoft Visual Studio
- "/openmp"
- #Intel windows
- "-Qopenmp"
- #PathScale, Intel
- "-openmp"
- #Sun
- "-xopenmp"
- #HP
- "+Oopenmp"
- #IBM XL C/c++
- "-qsmp"
- #Portland Group, MIPSpro
- "-mp"
- )
-
- set(OMP_FLAG_GNU "-fopenmp")
- set(OMP_FLAG_HP "+Oopenmp")
- if(WIN32)
- set(OMP_FLAG_Intel "-Qopenmp")
- elseif(CMAKE_${LANG}_COMPILER_ID STREQUAL "Intel" AND
- "${CMAKE_${LANG}_COMPILER_VERSION}" VERSION_LESS "15.0.0.20140528")
- set(OMP_FLAG_Intel "-openmp")
- else()
- set(OMP_FLAG_Intel "-qopenmp")
- endif()
- set(OMP_FLAG_MIPSpro "-mp")
- set(OMP_FLAG_MSVC "/openmp")
- set(OMP_FLAG_PathScale "-openmp")
- set(OMP_FLAG_PGI "-mp")
- set(OMP_FLAG_SunPro "-xopenmp")
- set(OMP_FLAG_XL "-qsmp")
- set(OMP_FLAG_Cray " ")
-
- # Move the flag that matches the compiler to the head of the list,
- # this is faster and doesn't clutter the output that much. If that
- # flag doesn't work we will still try all.
- if(OMP_FLAG_${CMAKE_${LANG}_COMPILER_ID})
- list(REMOVE_ITEM OpenMP_FLAG_CANDIDATES "${OMP_FLAG_${CMAKE_${LANG}_COMPILER_ID}}")
- list(INSERT OpenMP_FLAG_CANDIDATES 0 "${OMP_FLAG_${CMAKE_${LANG}_COMPILER_ID}}")
- endif()
-
- set(OpenMP_${LANG}_FLAG_CANDIDATES "${OpenMP_FLAG_CANDIDATES}" PARENT_SCOPE)
-endfunction()
-
-# sample openmp source code to test
-set(OpenMP_C_TEST_SOURCE
-"
-#include <omp.h>
-int main() {
-#ifdef _OPENMP
- return 0;
-#else
- breaks_on_purpose
-#endif
-}
-")
-
-# same in Fortran
-set(OpenMP_Fortran_TEST_SOURCE
- "
- program test
- use omp_lib
- integer :: n
- n = omp_get_num_threads()
- end program test
- "
- )
-
-# check c compiler
-if(CMAKE_C_COMPILER_LOADED)
- # if these are set then do not try to find them again,
- # by avoiding any try_compiles for the flags
- if(OpenMP_C_FLAGS)
- unset(OpenMP_C_FLAG_CANDIDATES)
- else()
- _OPENMP_FLAG_CANDIDATES("C")
- include(${CMAKE_CURRENT_LIST_DIR}/CheckCSourceCompiles.cmake)
- endif()
-
- foreach(FLAG IN LISTS OpenMP_C_FLAG_CANDIDATES)
- set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
- set(CMAKE_REQUIRED_FLAGS "${FLAG}")
- unset(OpenMP_FLAG_DETECTED CACHE)
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Try OpenMP C flag = [${FLAG}]")
- endif()
- check_c_source_compiles("${OpenMP_C_TEST_SOURCE}" OpenMP_FLAG_DETECTED)
- set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
- if(OpenMP_FLAG_DETECTED)
- set(OpenMP_C_FLAGS_INTERNAL "${FLAG}")
- break()
- endif()
- endforeach()
-
- set(OpenMP_C_FLAGS "${OpenMP_C_FLAGS_INTERNAL}"
- CACHE STRING "C compiler flags for OpenMP parallization")
-
- list(APPEND _OPENMP_REQUIRED_VARS OpenMP_C_FLAGS)
- unset(OpenMP_C_FLAG_CANDIDATES)
-endif()
-
-# check cxx compiler
-if(CMAKE_CXX_COMPILER_LOADED)
- # if these are set then do not try to find them again,
- # by avoiding any try_compiles for the flags
- if(OpenMP_CXX_FLAGS)
- unset(OpenMP_CXX_FLAG_CANDIDATES)
- else()
- _OPENMP_FLAG_CANDIDATES("CXX")
- include(${CMAKE_CURRENT_LIST_DIR}/CheckCXXSourceCompiles.cmake)
-
- # use the same source for CXX as C for now
- set(OpenMP_CXX_TEST_SOURCE ${OpenMP_C_TEST_SOURCE})
- endif()
-
- foreach(FLAG IN LISTS OpenMP_CXX_FLAG_CANDIDATES)
- set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
- set(CMAKE_REQUIRED_FLAGS "${FLAG}")
- unset(OpenMP_FLAG_DETECTED CACHE)
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Try OpenMP CXX flag = [${FLAG}]")
- endif()
- check_cxx_source_compiles("${OpenMP_CXX_TEST_SOURCE}" OpenMP_FLAG_DETECTED)
- set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
- if(OpenMP_FLAG_DETECTED)
- set(OpenMP_CXX_FLAGS_INTERNAL "${FLAG}")
- break()
- endif()
- endforeach()
-
- set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS_INTERNAL}"
- CACHE STRING "C++ compiler flags for OpenMP parallization")
-
- list(APPEND _OPENMP_REQUIRED_VARS OpenMP_CXX_FLAGS)
- unset(OpenMP_CXX_FLAG_CANDIDATES)
- unset(OpenMP_CXX_TEST_SOURCE)
-endif()
-
-# check Fortran compiler
-if(CMAKE_Fortran_COMPILER_LOADED)
- # if these are set then do not try to find them again,
- # by avoiding any try_compiles for the flags
- if(OpenMP_Fortran_FLAGS)
- unset(OpenMP_Fortran_FLAG_CANDIDATES)
- else()
- _OPENMP_FLAG_CANDIDATES("Fortran")
- include(${CMAKE_CURRENT_LIST_DIR}/CheckFortranSourceCompiles.cmake)
- endif()
-
- foreach(FLAG IN LISTS OpenMP_Fortran_FLAG_CANDIDATES)
- set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
- set(CMAKE_REQUIRED_FLAGS "${FLAG}")
- unset(OpenMP_FLAG_DETECTED CACHE)
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Try OpenMP Fortran flag = [${FLAG}]")
- endif()
- check_fortran_source_compiles("${OpenMP_Fortran_TEST_SOURCE}" OpenMP_FLAG_DETECTED)
- set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
- if(OpenMP_FLAG_DETECTED)
- set(OpenMP_Fortran_FLAGS_INTERNAL "${FLAG}")
- break()
- endif()
- endforeach()
-
- set(OpenMP_Fortran_FLAGS "${OpenMP_Fortran_FLAGS_INTERNAL}"
- CACHE STRING "Fortran compiler flags for OpenMP parallization")
-
- list(APPEND _OPENMP_REQUIRED_VARS OpenMP_Fortran_FLAGS)
- unset(OpenMP_Fortran_FLAG_CANDIDATES)
- unset(OpenMP_Fortran_TEST_SOURCE)
-endif()
-
-set(CMAKE_REQUIRED_QUIET ${CMAKE_REQUIRED_QUIET_SAVE})
-
-if(_OPENMP_REQUIRED_VARS)
- include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
-
- find_package_handle_standard_args(OpenMP
- REQUIRED_VARS ${_OPENMP_REQUIRED_VARS})
-
- mark_as_advanced(${_OPENMP_REQUIRED_VARS})
-
- unset(_OPENMP_REQUIRED_VARS)
-else()
- message(SEND_ERROR "FindOpenMP requires C or CXX language to be enabled")
-endif()