240 lines
7.3 KiB
CMake
240 lines
7.3 KiB
CMake
#.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()
|