| # - 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 set. |
| # |
| # 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_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> |
| # |
| # 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.) |
| |
| include(CheckCSourceCompiles) |
| include(CheckCXXSourceCompiles) |
| include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) |
| |
| set(OpenMP_C_FLAG_CANDIDATES |
| #Gnu |
| "-fopenmp" |
| #Microsoft Visual Studio |
| "/openmp" |
| #Intel windows |
| "-Qopenmp" |
| #Intel |
| "-openmp" |
| #Empty, if compiler automatically accepts openmp |
| " " |
| #Sun |
| "-xopenmp" |
| #HP |
| "+Oopenmp" |
| #IBM XL C/c++ |
| "-qsmp" |
| #Portland Group |
| "-mp" |
| ) |
| set(OpenMP_CXX_FLAG_CANDIDATES ${OpenMP_C_FLAG_CANDIDATES}) |
| |
| # 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 |
| } |
| ") |
| # use the same source for CXX as C for now |
| set(OpenMP_CXX_TEST_SOURCE ${OpenMP_C_TEST_SOURCE}) |
| # if these are set then do not try to find them again, |
| # by avoiding any try_compiles for the flags |
| if(DEFINED OpenMP_C_FLAGS AND DEFINED OpenMP_CXX_FLAGS) |
| set(OpenMP_C_FLAG_CANDIDATES) |
| set(OpenMP_CXX_FLAG_CANDIDATES) |
| endif(DEFINED OpenMP_C_FLAGS AND DEFINED OpenMP_CXX_FLAGS) |
| |
| # check c compiler |
| foreach(FLAG ${OpenMP_C_FLAG_CANDIDATES}) |
| set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}") |
| set(CMAKE_REQUIRED_FLAGS "${FLAG}") |
| unset(OpenMP_FLAG_DETECTED CACHE) |
| message(STATUS "Try OpenMP C flag = [${FLAG}]") |
| check_c_source_compiles("${OpenMP_CXX_TEST_SOURCE}" OpenMP_FLAG_DETECTED) |
| set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}") |
| if(OpenMP_FLAG_DETECTED) |
| set(OpenMP_C_FLAGS_INTERNAL "${FLAG}") |
| break() |
| endif(OpenMP_FLAG_DETECTED) |
| endforeach(FLAG ${OpenMP_C_FLAG_CANDIDATES}) |
| |
| # check cxx compiler |
| foreach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES}) |
| set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}") |
| set(CMAKE_REQUIRED_FLAGS "${FLAG}") |
| unset(OpenMP_FLAG_DETECTED CACHE) |
| message(STATUS "Try OpenMP CXX flag = [${FLAG}]") |
| check_cxx_source_compiles("${OpenMP_C_TEST_SOURCE}" OpenMP_FLAG_DETECTED) |
| set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}") |
| if(OpenMP_FLAG_DETECTED) |
| set(OpenMP_CXX_FLAGS_INTERNAL "${FLAG}") |
| break() |
| endif(OpenMP_FLAG_DETECTED) |
| endforeach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES}) |
| |
| set(OpenMP_C_FLAGS "${OpenMP_C_FLAGS_INTERNAL}" |
| CACHE STRING "C compiler flags for OpenMP parallization") |
| |
| set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS_INTERNAL}" |
| CACHE STRING "C++ compiler flags for OpenMP parallization") |
| # handle the standard arguments for find_package |
| find_package_handle_standard_args(OpenMP DEFAULT_MSG |
| OpenMP_C_FLAGS OpenMP_CXX_FLAGS ) |
| |
| mark_as_advanced( |
| OpenMP_C_FLAGS |
| OpenMP_CXX_FLAGS |
| ) |