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