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Clang aims to be compatible with GCC when it comes to command-line parameters. Where we enable functionality based on the presence of a GCC-compiler, we can use the same functionality with Clang. This patch introduces a new variable CXX_COMPAT_GCC which is true if the compiler handles the same options as GCC, and this variable is subsequently used in tests instead of CMAKE_COMPILER_IS_GNUCXX (which remains if we need to test if we really have GCC, e.g. for version)
71 lines
2.1 KiB
CMake
71 lines
2.1 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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include (UseCompVer)
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is_compiler_gcc_compatible ()
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macro (find_openmp opm)
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# default is that OpenMP is not considered to be there; if we set this
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# to a blank definition, it may be added but it cannot be removed if
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# it propagates to other projects (someone declares it to be part of
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# _CONFIG_VARS)
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set (HAVE_OPENMP)
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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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set (HAVE_OPENMP 1)
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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 (CXX_COMPAT_GCC)
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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()
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endif (USE_OPENMP)
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endmacro (find_openmp opm)
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