Roland Kaufmann
252d853147
If support for OpenMP should be added, it must be specified by setting an option. If not, then warnings for unknown pragmas are disabled, so that the code can have #pragma omp witout getting messages during build.
61 lines
1.8 KiB
CMake
61 lines
1.8 KiB
CMake
# - Use OpenMP features
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#
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# Synopsis:
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#
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# find_openmp (module)
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#
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# where:
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#
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# module Name of the module to which OpenMP libraries
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# etc. should be added, e.g. "opm-core".
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#
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# Note: Compiler flags are always added globally, to avoid ABI
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# incompatibility problems.
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#
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# It is assumed that the following variables are available
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#
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# ${module}_QUIET Verbosity level of the parent's find module
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# ${module}_LIBRARIES List of libraries to which OpenMP will be added
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#
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# Example:
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# find_openmp (opm-core)
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# remove_dup_deps (opm-core)
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include (AddOptions)
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macro (find_openmp opm)
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# user code can be conservative by setting USE_OPENMP_DEFAULT
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if (NOT DEFINED USE_OPENMP_DEFAULT)
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set (USE_OPENMP_DEFAULT ON)
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endif (NOT DEFINED USE_OPENMP_DEFAULT)
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option (USE_OPENMP "Enable OpenMP for parallelization" ${USE_OPENMP_DEFAULT})
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if (USE_OPENMP)
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# enabling OpenMP is supposedly enough to make the compiler link with
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# the appropriate libraries
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find_package (OpenMP ${${opm}_QUIET})
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list (APPEND ${opm}_LIBRARIES ${OpenMP_LIBRARIES})
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if (OPENMP_FOUND)
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add_options (C ALL_BUILDS "${OpenMP_C_FLAGS}")
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add_options (CXX ALL_BUILDS "${OpenMP_CXX_FLAGS}")
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endif (OPENMP_FOUND)
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# threading library (search for this *after* OpenMP
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set (CMAKE_THREAD_PREFER_PTHREAD TRUE)
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find_package (Threads ${${opm}_QUIET})
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if (CMAKE_USE_PTHREADS_INIT)
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list (APPEND ${opm}_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
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endif (CMAKE_USE_PTHREADS_INIT)
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else (USE_OPENMP)
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message (STATUS "OpenMP: disabled")
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# if we don't have OpenMP support, then don't show warnings that these
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# pragmas are unknown
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if (CMAKE_COMPILER_IS_GNUCXX)
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add_options (ALL_LANGUAGES ALL_BUILDS "-Wno-unknown-pragmas")
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elseif (MSVC)
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add_options (ALL_LANGUAGES ALL_BUILDS "-wd4068")
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endif(CMAKE_COMPILER_IS_GNUCXX)
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endif (USE_OPENMP)
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endmacro (find_openmp opm)
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