FindOpenMP: fix detecting compilers that do not need any special flag (#14567)
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@ -31,6 +31,8 @@ set(_OPENMP_REQUIRED_VARS)
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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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@ -39,8 +41,6 @@ function(_OPENMP_FLAG_CANDIDATES LANG)
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"-Qopenmp"
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#PathScale, 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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@ -64,6 +64,7 @@ function(_OPENMP_FLAG_CANDIDATES LANG)
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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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@ -100,7 +101,7 @@ if(CMAKE_C_COMPILER_LOADED)
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include(${CMAKE_CURRENT_LIST_DIR}/CheckCSourceCompiles.cmake)
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endif()
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foreach(FLAG ${OpenMP_C_FLAG_CANDIDATES})
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foreach(FLAG IN LISTS OpenMP_C_FLAG_CANDIDATES)
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set(SAFE_CMAKE_REQUIRED_FLAGS "${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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@ -134,7 +135,7 @@ if(CMAKE_CXX_COMPILER_LOADED)
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set(OpenMP_CXX_TEST_SOURCE ${OpenMP_C_TEST_SOURCE})
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endif()
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foreach(FLAG ${OpenMP_CXX_FLAG_CANDIDATES})
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foreach(FLAG IN LISTS OpenMP_CXX_FLAG_CANDIDATES)
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set(SAFE_CMAKE_REQUIRED_FLAGS "${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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