115 lines
3.7 KiB
CMake
115 lines
3.7 KiB
CMake
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# - Finds OpenMP support
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# This module can be used to detect OpenMP support in a compiler.
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# If the compiler supports OpenMP, the flags required to compile with
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# openmp support are set.
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#
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# The following variables are set:
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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_FOUND - true if openmp is detected
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#
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# Supported compilers can be found at 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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#
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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 distributed this file outside of CMake, substitute the full
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# License text for the above reference.)
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include(CheckCSourceCompiles)
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include(CheckCXXSourceCompiles)
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include(FindPackageHandleStandardArgs)
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set(OpenMP_C_FLAG_CANDIDATES
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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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#Intel
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"-openmp"
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#Empty, if compiler automatically accepts openmp
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" "
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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
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"-mp"
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)
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set(OpenMP_CXX_FLAG_CANDIDATES ${OpenMP_C_FLAG_CANDIDATES})
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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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# 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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# 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(DEFINED OpenMP_C_FLAGS AND DEFINED OpenMP_CXX_FLAGS)
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set(OpenMP_C_FLAG_CANDIDATES)
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set(OpenMP_CXX_FLAG_CANDIDATES)
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endif(DEFINED OpenMP_C_FLAGS AND DEFINED OpenMP_CXX_FLAGS)
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# check c compiler
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foreach(FLAG ${OpenMP_C_FLAG_CANDIDATES})
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set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${FLAG}")
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unset(OpenMP_FLAG_DETECTED CACHE)
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message(STATUS "Try OpenMP C flag = [${FLAG}]")
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check_c_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_C_FLAGS_INTERNAL "${FLAG}")
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break()
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endif(OpenMP_FLAG_DETECTED)
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endforeach(FLAG ${OpenMP_C_FLAG_CANDIDATES})
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# check cxx compiler
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foreach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES})
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set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${FLAG}")
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unset(OpenMP_FLAG_DETECTED CACHE)
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message(STATUS "Try OpenMP CXX flag = [${FLAG}]")
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check_cxx_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_CXX_FLAGS_INTERNAL "${FLAG}")
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break()
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endif(OpenMP_FLAG_DETECTED)
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endforeach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES})
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set(OpenMP_C_FLAGS "${OpenMP_C_FLAGS_INTERNAL}"
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CACHE STRING "C compiler flags for OpenMP parallization")
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set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS_INTERNAL}"
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CACHE STRING "C++ compiler flags for OpenMP parallization")
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# handle the standard arguments for find_package
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find_package_handle_standard_args(OpenMP DEFAULT_MSG
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OpenMP_C_FLAGS OpenMP_CXX_FLAGS )
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mark_as_advanced(
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OpenMP_C_FLAGS
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OpenMP_CXX_FLAGS
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)
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