FindOpenMP: do not fail if only C or CXX is enabled (#11910)
Inspired-By: Raymond Wan
This commit is contained in:
Rolf Eike Beer
parent
59ecc2c8ac
commit
81228e9d1d
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@ -24,9 +24,12 @@
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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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include(CheckCSourceCompiles)
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include(CheckCXXSourceCompiles)
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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get_property(_ENABLED_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
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list(FIND _ENABLED_LANGUAGES "C" _HAVE_LANGUAGE_C)
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list(FIND _ENABLED_LANGUAGES "CXX" _HAVE_LANGUAGE_CXX)
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unset(_ENABLED_LANGUAGES)
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set(_OPENMP_REQUIRED_VARS)
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set(OpenMP_C_FLAG_CANDIDATES
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#Gnu
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@ -62,8 +65,6 @@ int main() {
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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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@ -72,43 +73,68 @@ if(DEFINED OpenMP_C_FLAGS AND DEFINED OpenMP_CXX_FLAGS)
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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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if(NOT _HAVE_LANGUAGE_C EQUAL -1)
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include(CheckCSourceCompiles)
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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("${OpenMP_C_TEST_SOURCE}" OpenMP_FLAG_DETECTED)
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set(CMAKE_REQUIRED_FLAGS "${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(OpenMP_FLAG_DETECTED)
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endforeach(FLAG ${OpenMP_C_FLAG_CANDIDATES})
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set(OpenMP_C_FLAGS "${OpenMP_C_FLAGS_INTERNAL}"
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CACHE STRING "C compiler flags for OpenMP parallization")
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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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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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if(NOT _HAVE_LANGUAGE_CXX EQUAL -1)
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include(CheckCXXSourceCompiles)
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# use the same source for CXX as C for now
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set(OpenMP_CXX_TEST_SOURCE ${OpenMP_C_TEST_SOURCE})
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set(OpenMP_C_FLAGS "${OpenMP_C_FLAGS_INTERNAL}"
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CACHE STRING "C compiler flags for OpenMP parallization")
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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("${OpenMP_CXX_TEST_SOURCE}" OpenMP_FLAG_DETECTED)
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set(CMAKE_REQUIRED_FLAGS "${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(OpenMP_FLAG_DETECTED)
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endforeach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES})
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set(OpenMP_CXX_FLAGS "${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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set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS_INTERNAL}"
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CACHE STRING "C++ compiler flags for OpenMP parallization")
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mark_as_advanced(
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OpenMP_C_FLAGS
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OpenMP_CXX_FLAGS
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)
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list(APPEND _OPENMP_REQUIRED_VARS OpenMP_CXX_FLAGS)
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unset(OpenMP_CXX_FLAG_CANDIDATES)
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unset(OpenMP_CXX_TEST_SOURCE)
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endif()
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unset(_HAVE_LANGUAGE_C)
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unset(_HAVE_LANGUAGE_CXX)
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if(_OPENMP_REQUIRED_VARS)
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include(${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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