ENH: Enhance FindMPI module by properly handling backward compatibility with the older module, adding documentation, and coping with multiple include and linker paths
This commit is contained in:
Douglas Gregor
parent
b03c246a00
commit
5b3e62c7bc
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@ -1,95 +1,132 @@
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# This module looks for the Message Passing Interface (MPI).
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# - Message Passing Interface (MPI) module.
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#
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# The Message Passing Interface (MPI) is a library used to write
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# high-performance parallel applications that use message passing, and
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# is typically deployed on a cluster. MPI is a standard interface
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# (defined by the MPI forum) for which many implementations are
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# available. All of these implementations have somewhat different
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# compilation approaches (different include paths, libraries to link
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# against, etc.), and this module tries to smooth out those differences.
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#
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# This module will set the following variables:
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# MPI_FOUND TRUE if we have found MPI
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# MPI_COMPILE_FLAGS Compilation flags for MPI programs
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# MPI_INCLUDE_PATH Include path for MPI header
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# MPI_INCLUDE_PATH Include path(s) for MPI header
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# MPI_LINK_FLAGS Linking flags for MPI programs
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# MPI_LIBRARIES Libraries to link MPI programs against
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# MPI_LIBRARY Deprecated; first MPI library to link against
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# MPI_EXTRA_LIBRARY Deprecated; second MPI library to link against
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# MPI_LIBRARY First MPI library to link against (cached)
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# MPI_EXTRA_LIBRARY Extra MPI libraries to link against (cached)
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# MPI_LIBRARIES All libraries to link MPI programs against
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# MPIEXEC Executable for running MPI programs
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# MPIEXEC_NUMPROC_FLAG Flag to pass to MPIEXEC before giving it the
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# number of processors to run on
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# MPIEXEC_PREFLAGS Flags to pass to MPIEXEC directly before the
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# executable to run.
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# MPIEXEC_POSTFLAGS Flags to pass to MPIEXEC after all other flags.
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#
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# This module will attempt to auto-detect these settings, first by
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# looking for a C++ MPI driver (e.g., mpic++, mpiCC, or mpicxx; set by
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# MPICXX) and later by checking common MPI paths and library names.
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# looking for a MPI compiler, which many MPI implementations provide
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# as a pass-through to the native compiler to simplify the compilation
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# of MPI programs. The MPI compiler is stored in the cache variable
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# MPI_COMPILER, and will attempt to look for commonly-named drivers
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# mpic++, mpicxx, mpiCC, or mpicc. If the compiler driver is found and
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# recognized, it will be used to set all of the module variables. To
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# skip this auto-detection, set MPI_LIBRARY and MPI_INCLUDE_PATH in
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# the CMake cache.
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#
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# If no compiler driver is found or the compiler driver is not
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# recognized, this module will then search for common include paths
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# and library names to try to detect MPI.
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#
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# If CMake initially finds a different MPI than was intended, and you
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# want to use the MPI compiler auto-detection for a different MPI
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# implementation, set MPI_COMPILER to the MPI compiler driver you want
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# to use (e.g., mpicxx) and then set MPI_LIBRARY to the string
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# MPI_LIBRARY-NOTFOUND. When you re-configure, auto-detection of MPI
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# will run again with the newly-specified MPI_COMPILER.
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#
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# When using MPIEXEC to execute MPI applications, you should typically
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# use all of the MPIEXEC flags as follows:
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# ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} PROCS ${MPIEXEC_PREFLAGS} EXECUTABLE
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# ${MPIEXEC_POSTFLAGS} ARGS
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# where PROCS is the number of processors on which to execute the program,
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# EXECUTABLE is the MPI program, and ARGS are the arguments to pass to the
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# MPI program.
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# Try to find the MPI driver program
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find_program(MPICXX
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NAMES mpic++ mpicxx mpiCC
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DOC "MPI C++ compiler. Used only to detect MPI compilation flags.")
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mark_as_advanced(MPICXX)
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find_program(MPI_COMPILER
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NAMES mpic++ mpicxx mpiCC mpicc
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DOC "MPI compiler. Used only to detect MPI compilation flags.")
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mark_as_advanced(MPI_COMPILER)
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find_program(MPIEXEC
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NAMES mpiexec mpirun
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NAMES mpiexec mpirun lamexec
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DOC "Executable for running MPI programs.")
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mark_as_advanced(MPIEXEC)
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if (NOT OLD_MPICXX STREQUAL MPICXX)
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set(MPI_FORCE_RECONFIGURE TRUE)
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set(OLD_MPICXX ${MPICXX} CACHE INTERNAL "Previous value of MPICXX" FORCE)
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endif (NOT OLD_MPICXX STREQUAL MPICXX)
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if (NOT MPICXX)
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# If there is no MPI C++ compiler, we force ourselves to configure
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# MPI the old way.
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set(MPI_FORCE_RECONFIGURE TRUE)
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endif (NOT MPICXX)
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set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify the number of processes for MPIEXEC; the next option will be the number of processes.")
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set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
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set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
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set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
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mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS
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MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
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if (MPICXX)
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if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
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# the cache, and we don't want to override those settings.
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elseif (MPI_COMPILER)
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# Check whether the -showme:compile option works. This indicates
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# that we have either Open MPI or a newer version of LAM-MPI, and
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# implies that -showme:link will also work.
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exec_program(${MPICXX}
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exec_program(${MPI_COMPILER}
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ARGS -showme:compile
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OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
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RETURN_VALUE MPICXX_RETURN)
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RETURN_VALUE MPI_COMPILER_RETURN)
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if (MPICXX_RETURN EQUAL 0)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# If we appear to have -showme:compile, then we should also have
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# -showme:link. Try it.
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exec_program(${MPICXX}
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exec_program(${MPI_COMPILER}
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ARGS -showme:link
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OUTPUT_VARIABLE MPI_LINK_CMDLINE
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RETURN_VALUE MPICXX_RETURN)
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endif (MPICXX_RETURN EQUAL 0)
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RETURN_VALUE MPI_COMPILER_RETURN)
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endif (MPI_COMPILER_RETURN EQUAL 0)
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if (MPICXX_RETURN EQUAL 0)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# Do nothing: we have our command lines now
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else (MPICXX_RETURN EQUAL 0)
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else (MPI_COMPILER_RETURN EQUAL 0)
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# Older versions of LAM-MPI have "-showme". Try it.
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exec_program(${MPICXX}
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exec_program(${MPI_COMPILER}
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ARGS -showme
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OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
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RETURN_VALUE MPICXX_RETURN)
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endif (MPICXX_RETURN EQUAL 0)
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RETURN_VALUE MPI_COMPILER_RETURN)
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endif (MPI_COMPILER_RETURN EQUAL 0)
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if (MPICXX_RETURN EQUAL 0)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# Do nothing: we have our command lines now
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else (MPICXX_RETURN EQUAL 0)
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else (MPI_COMPILER_RETURN EQUAL 0)
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# MPICH uses "-show". Try it.
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exec_program(${MPICXX}
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exec_program(${MPI_COMPILER}
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ARGS -show
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OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
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RETURN_VALUE MPICXX_RETURN)
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endif (MPICXX_RETURN EQUAL 0)
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RETURN_VALUE MPI_COMPILER_RETURN)
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endif (MPI_COMPILER_RETURN EQUAL 0)
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if (MPICXX_RETURN EQUAL 0)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# We have our command lines, but we might need to copy
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# MPI_COMPILE_CMDLINE into MPI_LINK_CMDLINE, if the underlying
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if (NOT MPI_LINK_CMDLINE)
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SET(MPI_LINK_CMDLINE ${MPI_COMPILE_CMDLINE})
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endif (NOT MPI_LINK_CMDLINE)
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else (MPICXX_RETURN EQUAL 0)
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message(STATUS "Unable to determine MPI from MPI driver ${MPICXX}")
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endif (MPICXX_RETURN EQUAL 0)
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endif (MPICXX)
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else (MPI_COMPILER_RETURN EQUAL 0)
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message(STATUS "Unable to determine MPI from MPI driver ${MPI_COMPILER}")
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endif (MPI_COMPILER_RETURN EQUAL 0)
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endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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if (NOT MPI_FORCE_RECONFIGURE)
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# We don't actually have to reconfigure anything
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if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
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# the cache, and we don't want to override those settings.
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elseif (MPI_COMPILE_CMDLINE)
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# Extract compile flags from the compile command line.
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string(REGEX MATCHALL "-D([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS ${MPI_COMPILE_CMDLINE})
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string(REGEX MATCHALL "-D([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS "${MPI_COMPILE_CMDLINE}")
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set(MPI_COMPILE_FLAGS_WORK)
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foreach(FLAG ${MPI_ALL_COMPILE_FLAGS})
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if (MPI_COMPILE_FLAGS_WORK)
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@ -100,17 +137,25 @@ elseif (MPI_COMPILE_CMDLINE)
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endforeach(FLAG)
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# Extract include paths from compile command line
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string(REGEX MATCH "-I([^\" ]+|\"[^\"]+\")" MPI_INCLUDE_PATH ${MPI_COMPILE_CMDLINE})
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string(REGEX REPLACE "^-I" "" MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH})
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string(REGEX REPLACE "//" "/" MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH})
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string(REGEX MATCHALL "-I([^\" ]+|\"[^\"]+\")" MPI_ALL_INCLUDE_PATHS "${MPI_COMPILE_CMDLINE}")
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set(MPI_INCLUDE_PATH_WORK)
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foreach(IPATH ${MPI_ALL_INCLUDE_PATHS})
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string(REGEX REPLACE "^-I" "" IPATH ${IPATH})
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string(REGEX REPLACE "//" "/" IPATH ${IPATH})
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list(APPEND MPI_INCLUDE_PATH_WORK ${IPATH})
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endforeach(IPATH)
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# Extract linker paths from the link command line
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string(REGEX MATCH "-L([^\" ]+|\"[^\"]+\")" MPI_LINK_PATH ${MPI_LINK_CMDLINE})
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string(REGEX REPLACE "^-L" "" MPI_LINK_PATH ${MPI_LINK_PATH})
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string(REGEX REPLACE "//" "/" MPI_LINK_PATH ${MPI_LINK_PATH})
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string(REGEX MATCHALL "-L([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_PATHS "${MPI_LINK_CMDLINE}")
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set(MPI_LINK_PATH)
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foreach(LPATH ${MPI_ALL_LINK_PATHS})
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string(REGEX REPLACE "^-L" "" LPATH ${LPATH})
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string(REGEX REPLACE "//" "/" LPATH ${LPATH})
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list(APPEND MPI_LINK_PATH ${LPATH})
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endforeach(LPATH)
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# Extract linker flags from the link command line
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string(REGEX MATCHALL "-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS ${MPI_LINK_CMDLINE})
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string(REGEX MATCHALL "-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${MPI_LINK_CMDLINE}")
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set(MPI_LINK_FLAGS_WORK)
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foreach(FLAG ${MPI_ALL_LINK_FLAGS})
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if (MPI_LINK_FLAGS_WORK)
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@ -122,7 +167,7 @@ elseif (MPI_COMPILE_CMDLINE)
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# Extract the set of libraries to link against from the link command
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# line
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string(REGEX MATCHALL "-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES ${MPI_LINK_CMDLINE})
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string(REGEX MATCHALL "-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
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# Determine full path names for all of the libraries that one needs
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# to link against in an MPI program
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@ -143,31 +188,23 @@ elseif (MPI_COMPILE_CMDLINE)
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# MPI_EXTRA_LIBRARY.
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list(LENGTH MPI_LIBRARIES MPI_NUMLIBS)
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if (MPI_NUMLIBS GREATER 0)
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list(GET MPI_LIBRARIES 0 MPI_LIBRARY)
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list(GET MPI_LIBRARIES 0 MPI_LIBRARY_WORK)
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set(MPI_LIBRARY ${MPI_LIBRARY_WORK} CACHE FILEPATH "MPI library to link against" FORCE)
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else (MPI_NUMLIBS GREATER 0)
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set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND")
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set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND" CACHE STRING "MPI library to link against" FORCE)
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endif (MPI_NUMLIBS GREATER 0)
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if (MPI_NUMLIBS GREATER 1)
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set(MPI_EXTRA_LIBRARY ${MPI_LIBRARIES})
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list(REMOVE_AT MPI_EXTRA_LIBRARY 0)
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set(MPI_EXTRA_LIBRARY_WORK ${MPI_LIBRARIES})
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list(REMOVE_AT MPI_EXTRA_LIBRARY_WORK 0)
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set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY_WORK} CACHE STRING "Extra MPI libraries to link against" FORCE)
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else (MPI_NUMLIBS GREATER 1)
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set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND")
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set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND" CACHE STRING "Extra MPI libraries to link against" FORCE)
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endif (MPI_NUMLIBS GREATER 1)
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# Set up all of the appropriate cache entries
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set(MPI_FOUND TRUE CACHE INTERNAL "Whether MPI was found" FORCE)
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if (NOT MPI_FORCE_RECONFIGURE)
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set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags")
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set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH} CACHE STRING "MPI include path")
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set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags")
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set(MPI_LIBRARIES ${MPI_LIBRARIES} CACHE STRING "MPI libraries to link against, separated by semicolons")
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else (NOT MPI_FORCE_RECONFIGURE)
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set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags" FORCE)
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set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH} CACHE STRING "MPI include path" FORCE)
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set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
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set(MPI_LIBRARIES ${MPI_LIBRARIES} CACHE STRING "MPI libraries to link against, separated by semicolons" FORCE)
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endif (NOT MPI_FORCE_RECONFIGURE)
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set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags" FORCE)
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set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH_WORK} CACHE STRING "MPI include path" FORCE)
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set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
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else (MPI_COMPILE_CMDLINE)
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find_path(MPI_INCLUDE_PATH mpi.h
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/usr/local/include
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@ -176,16 +213,16 @@ else (MPI_COMPILE_CMDLINE)
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/usr/local/mpi/include
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"C:/Program Files/MPICH/SDK/Include"
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"$ENV{SystemDrive}/Program Files/MPICH2/include"
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"C:/Program Files/Microsoft Compute Cluster Pack/Include"
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"$ENV{SystemDrive}/Program Files/Microsoft Compute Cluster Pack/Include"
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)
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# TODO: How do we know whether we're building 32-bit vs. 64-bit?
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# TODO: How do we know whether we're building 32-bit vs. 64-bit for MS-MPI?
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find_library(MPI_LIBRARY
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NAMES mpi mpich
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PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
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"C:/Program Files/MPICH/SDK/Lib"
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"$ENV{SystemDrive}/Program Files/MPICH/SDK/Lib"
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"C:/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
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"$ENV{SystemDrive}/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
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)
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find_library(MPI_LIBRARY
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NAMES mpich2
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@ -196,24 +233,11 @@ else (MPI_COMPILE_CMDLINE)
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NAMES mpi++
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PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
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"C:/Program Files/MPICH/SDK/Lib"
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"C:/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
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DOC "If a second MPI library is necessary, specify it here.")
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DOC "Extra MPI libraries to link against.")
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set(MPI_COMPILE_FLAGS "" CACHE STRING "MPI compilation flags")
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set(MPI_LINK_FLAGS "" CACHE STRING "MPI linking flags")
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if (MPI_EXTRA_LIBRARY)
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set(MPI_LIBRARIES "${MPI_LIBRARY};${MPI_EXTRA_LIBRARY}" CACHE STRING "MPI libraries to link against, separated by semicolons")
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else (MPI_EXTRA_LIBRARY)
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set(MPI_LIBRARIES ${MPI_LIBRARY} CACHE STRING "MPI libraries to link against, separated by semicolons")
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endif (MPI_EXTRA_LIBRARY)
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if (MPI_LIBRARY)
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set(MPI_FOUND TRUE CACHE INTERNAL "Whether MPI was found" FORCE)
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else (MPI_LIBRARY)
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set(MPI_FOUND FALSE CACHE INTERNAL "Whether MPI was found" FORCE)
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endif (MPI_LIBRARY)
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endif (NOT MPI_FORCE_RECONFIGURE)
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endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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# on BlueGene/L the MPI lib is named libmpich.rts.a, there also these additional libs are required
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if("${MPI_LIBRARY}" MATCHES "mpich.rts")
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@ -221,10 +245,22 @@ if("${MPI_LIBRARY}" MATCHES "mpich.rts")
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set(MPI_LIBRARY ${MPI_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
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endif("${MPI_LIBRARY}" MATCHES "mpich.rts")
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set(MPI_LIBRARY ${MPI_LIBRARY} CACHE INTERNAL "MPI library to link against. Deprecated: use MPI_LIBRARIES instead")
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set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY} CACHE INTERNAL "Second MPI library to link against. Deprecated: use MPI_LIBRARIES instead")
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# Set up extra variables to conform to
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if (MPI_EXTRA_LIBRARY)
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set(MPI_LIBRARIES ${MPI_LIBRARY} ${MPI_EXTRA_LIBRARY})
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else (MPI_EXTRA_LIBRARY)
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set(MPI_LIBRARIES ${MPI_LIBRARY})
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endif (MPI_EXTRA_LIBRARY)
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if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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set(MPI_FOUND TRUE)
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else (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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set(MPI_FOUND FALSE)
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endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
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include(FindPackageHandleStandardArgs)
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# handle the QUIETLY and REQUIRED arguments
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find_package_handle_standard_args(MPI DEFAULT_MSG MPI_LIBRARY MPI_INCLUDE_PATH)
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mark_as_advanced(MPI_INCLUDE_PATH MPI_COMPILE_FLAGS MPI_LINK_FLAGS MPI_LIBRARIES)
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mark_as_advanced(MPI_INCLUDE_PATH MPI_COMPILE_FLAGS MPI_LINK_FLAGS MPI_LIBRARY
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MPI_EXTRA_LIBRARY)
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