CMake/Modules/FindMPI.cmake

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# - Message Passing Interface (MPI) module.
#
# The Message Passing Interface (MPI) is a library used to write
# high-performance parallel applications that use message passing, and
# is typically deployed on a cluster. MPI is a standard interface
# (defined by the MPI forum) for which many implementations are
# available. All of these implementations have somewhat different
# compilation approaches (different include paths, libraries to link
# against, etc.), and this module tries to smooth out those differences.
#
# This module will set the following variables:
# MPI_FOUND TRUE if we have found MPI
# MPI_COMPILE_FLAGS Compilation flags for MPI programs
# MPI_INCLUDE_PATH Include path(s) for MPI header
# MPI_LINK_FLAGS Linking flags for MPI programs
# MPI_LIBRARY First MPI library to link against (cached)
# MPI_EXTRA_LIBRARY Extra MPI libraries to link against (cached)
# MPI_LIBRARIES All libraries to link MPI programs against
# MPIEXEC Executable for running MPI programs
# MPIEXEC_NUMPROC_FLAG Flag to pass to MPIEXEC before giving it the
# number of processors to run on
# MPIEXEC_PREFLAGS Flags to pass to MPIEXEC directly before the
# executable to run.
# MPIEXEC_POSTFLAGS Flags to pass to MPIEXEC after all other flags.
#
# This module will attempt to auto-detect these settings, first by
# looking for a MPI compiler, which many MPI implementations provide
# as a pass-through to the native compiler to simplify the compilation
# of MPI programs. The MPI compiler is stored in the cache variable
# MPI_COMPILER, and will attempt to look for commonly-named drivers
# mpic++, mpicxx, mpiCC, or mpicc. If the compiler driver is found and
# recognized, it will be used to set all of the module variables. To
# skip this auto-detection, set MPI_LIBRARY and MPI_INCLUDE_PATH in
# the CMake cache.
#
# If no compiler driver is found or the compiler driver is not
# recognized, this module will then search for common include paths
# and library names to try to detect MPI.
#
# If CMake initially finds a different MPI than was intended, and you
# want to use the MPI compiler auto-detection for a different MPI
# implementation, set MPI_COMPILER to the MPI compiler driver you want
# to use (e.g., mpicxx) and then set MPI_LIBRARY to the string
# MPI_LIBRARY-NOTFOUND. When you re-configure, auto-detection of MPI
# will run again with the newly-specified MPI_COMPILER.
#
# When using MPIEXEC to execute MPI applications, you should typically
# use all of the MPIEXEC flags as follows:
# ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} PROCS ${MPIEXEC_PREFLAGS} EXECUTABLE
# ${MPIEXEC_POSTFLAGS} ARGS
# where PROCS is the number of processors on which to execute the program,
# EXECUTABLE is the MPI program, and ARGS are the arguments to pass to the
# MPI program.
#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
# This module is maintained by David Partyka <dave.partyka@kitware.com>.
# A set of directories to search through in addition to the standard system paths
# that find_program will search through.
# Microsoft HPC SDK is automatically added to the system path
# Argonne National Labs MPICH2 sets a registry key that we can use.
set(_MPI_PACKAGE_DIR
mpi
mpich
openmpi
lib/mpi
lib/mpich
lib/openmpi
"MPICH/SDK"
"Microsoft Compute Cluster Pack"
)
set(_MPI_PREFIX_PATH)
if(WIN32)
list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH\\SMPD;binary]/..")
list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH2;Path]")
endif()
foreach(SystemPrefixDir ${CMAKE_SYSTEM_PREFIX_PATH})
foreach(MpiPackageDir ${_MPI_PREFIX_PATH})
if(EXISTS ${SystemPrefixDir}/${MpiPackageDir})
list(APPEND _MPI_PREFIX_PATH "${SystemPrefixDir}/${MpiPackageDir}")
endif()
endforeach(MpiPackageDir)
endforeach(SystemPrefixDir)
# Most mpi distros have some form of mpiexec which gives us something we can reliably look for.
find_program(MPIEXEC
NAMES mpiexec mpirun lamexec
PATHS ${_MPI_PREFIX_PATH}
PATH_SUFFIXES bin
DOC "Executable for running MPI programs."
)
# call get_filename_component twice to remove mpiexec and the directory it exists in (typically bin).
# This gives us a fairly reliable base directory to search for /bin /lib and /include from.
get_filename_component(_MPI_BASE_DIR "${MPIEXEC}" PATH)
get_filename_component(_MPI_BASE_DIR "${_MPI_BASE_DIR}" PATH)
# If there is an mpi compiler find it and interogate (farther below) it for the include
# and lib dirs otherwise we will continue to search from ${_MPI_BASE_DIR}.
find_program(MPI_COMPILER
NAMES mpic++ mpicxx mpiCC mpicc
HINTS "${_MPI_BASE_DIR}"
PATH_SUFFIXES bin
DOC "MPI compiler. Used only to detect MPI compilation flags.")
mark_as_advanced(MPI_COMPILER)
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.")
set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS
MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
# the cache, and we don't want to override those settings.
elseif (MPI_COMPILER)
# Check whether the -showme:compile option works. This indicates
# that we have either Open MPI or a newer version of LAM-MPI, and
# implies that -showme:link will also work.
# Note that Windows distros do not have an mpi compiler to interogate.
exec_program(${MPI_COMPILER}
ARGS -showme:compile
OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
RETURN_VALUE MPI_COMPILER_RETURN)
if (MPI_COMPILER_RETURN EQUAL 0)
# If we appear to have -showme:compile, then we should also have
# -showme:link. Try it.
exec_program(${MPI_COMPILER}
ARGS -showme:link
OUTPUT_VARIABLE MPI_LINK_CMDLINE
RETURN_VALUE MPI_COMPILER_RETURN)
# Note that we probably have -showme:incdirs and -showme:libdirs
# as well.
set(MPI_COMPILER_MAY_HAVE_INCLIBDIRS TRUE)
endif (MPI_COMPILER_RETURN EQUAL 0)
if (MPI_COMPILER_RETURN EQUAL 0)
# Do nothing: we have our command lines now
else (MPI_COMPILER_RETURN EQUAL 0)
# Older versions of LAM-MPI have "-showme". Try it.
exec_program(${MPI_COMPILER}
ARGS -showme
OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
RETURN_VALUE MPI_COMPILER_RETURN)
endif (MPI_COMPILER_RETURN EQUAL 0)
if (MPI_COMPILER_RETURN EQUAL 0)
# Do nothing: we have our command lines now
else (MPI_COMPILER_RETURN EQUAL 0)
# MPICH uses "-show". Try it.
exec_program(${MPI_COMPILER}
ARGS -show
OUTPUT_VARIABLE MPI_COMPILE_CMDLINE
RETURN_VALUE MPI_COMPILER_RETURN)
endif (MPI_COMPILER_RETURN EQUAL 0)
if (MPI_COMPILER_RETURN EQUAL 0)
# We have our command lines, but we might need to copy
# MPI_COMPILE_CMDLINE into MPI_LINK_CMDLINE, if the underlying
if (NOT MPI_LINK_CMDLINE)
SET(MPI_LINK_CMDLINE ${MPI_COMPILE_CMDLINE})
endif (NOT MPI_LINK_CMDLINE)
else (MPI_COMPILER_RETURN EQUAL 0)
message(STATUS "Unable to determine MPI from MPI driver ${MPI_COMPILER}")
endif (MPI_COMPILER_RETURN EQUAL 0)
endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
# the cache, and we don't want to override those settings.
elseif (MPI_COMPILE_CMDLINE)
# Extract compile flags from the compile command line.
string(REGEX MATCHALL "(^| )-[Df]([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS "${MPI_COMPILE_CMDLINE}")
set(MPI_COMPILE_FLAGS_WORK)
foreach(FLAG ${MPI_ALL_COMPILE_FLAGS})
if (MPI_COMPILE_FLAGS_WORK)
set(MPI_COMPILE_FLAGS_WORK "${MPI_COMPILE_FLAGS_WORK} ${FLAG}")
else(MPI_COMPILE_FLAGS_WORK)
set(MPI_COMPILE_FLAGS_WORK ${FLAG})
endif(MPI_COMPILE_FLAGS_WORK)
endforeach(FLAG)
# Extract include paths from compile command line
string(REGEX MATCHALL "(^| )-I([^\" ]+|\"[^\"]+\")" MPI_ALL_INCLUDE_PATHS "${MPI_COMPILE_CMDLINE}")
set(MPI_INCLUDE_PATH_WORK)
foreach(IPATH ${MPI_ALL_INCLUDE_PATHS})
string(REGEX REPLACE "^ ?-I" "" IPATH ${IPATH})
string(REGEX REPLACE "//" "/" IPATH ${IPATH})
list(APPEND MPI_INCLUDE_PATH_WORK ${IPATH})
endforeach(IPATH)
if (NOT MPI_INCLUDE_PATH_WORK)
if (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
# The compile command line didn't have any include paths on it,
# but we may have -showme:incdirs. Use it.
exec_program(${MPI_COMPILER}
ARGS -showme:incdirs
OUTPUT_VARIABLE MPI_INCLUDE_PATH_WORK
RETURN_VALUE MPI_COMPILER_RETURN)
separate_arguments(MPI_INCLUDE_PATH_WORK)
endif (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
endif (NOT MPI_INCLUDE_PATH_WORK)
if (NOT MPI_INCLUDE_PATH_WORK)
# If all else fails, just search for mpi.h in the normal include
# paths.
find_path(MPI_INCLUDE_PATH mpi.h
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
PATH_SUFFIXES include
)
set(MPI_INCLUDE_PATH_WORK ${MPI_INCLUDE_PATH})
endif (NOT MPI_INCLUDE_PATH_WORK)
# Extract linker paths from the link command line
string(REGEX MATCHALL "(^| |-Wl,)-L([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_PATHS "${MPI_LINK_CMDLINE}")
set(MPI_LINK_PATH)
foreach(LPATH ${MPI_ALL_LINK_PATHS})
string(REGEX REPLACE "^(| |-Wl,)-L" "" LPATH ${LPATH})
string(REGEX REPLACE "//" "/" LPATH ${LPATH})
list(APPEND MPI_LINK_PATH ${LPATH})
endforeach(LPATH)
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if (NOT MPI_LINK_PATH)
if (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
# The compile command line didn't have any linking paths on it,
# but we may have -showme:libdirs. Use it.
exec_program(${MPI_COMPILER}
ARGS -showme:libdirs
OUTPUT_VARIABLE MPI_LINK_PATH
RETURN_VALUE MPI_COMPILER_RETURN)
separate_arguments(MPI_LINK_PATH)
endif (MPI_COMPILER_MAY_HAVE_INCLIBDIRS)
endif (NOT MPI_LINK_PATH)
# Extract linker flags from the link command line
string(REGEX MATCHALL "(^| )-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${MPI_LINK_CMDLINE}")
set(MPI_LINK_FLAGS_WORK)
foreach(FLAG ${MPI_ALL_LINK_FLAGS})
if (MPI_LINK_FLAGS_WORK)
set(MPI_LINK_FLAGS_WORK "${MPI_LINK_FLAGS_WORK} ${FLAG}")
else(MPI_LINK_FLAGS_WORK)
set(MPI_LINK_FLAGS_WORK ${FLAG})
endif(MPI_LINK_FLAGS_WORK)
endforeach(FLAG)
# Extract the set of libraries to link against from the link command
# line
string(REGEX MATCHALL "(^| )-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
# Determine full path names for all of the libraries that one needs
# to link against in an MPI program
set(MPI_LIBRARIES)
foreach(LIB ${MPI_LIBNAMES})
string(REGEX REPLACE "^ ?-l" "" LIB ${LIB})
set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
find_library(MPI_LIB ${LIB} HINTS ${MPI_LINK_PATH})
if (MPI_LIB)
list(APPEND MPI_LIBRARIES ${MPI_LIB})
elseif (NOT MPI_FIND_QUIETLY)
message(WARNING "Unable to find MPI library ${LIB}")
endif ()
endforeach(LIB)
set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI detection" FORCE)
# Chop MPI_LIBRARIES into the old-style MPI_LIBRARY and
# MPI_EXTRA_LIBRARY.
list(LENGTH MPI_LIBRARIES MPI_NUMLIBS)
list(LENGTH MPI_LIBNAMES MPI_NUMLIBS_EXPECTED)
if (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
list(GET MPI_LIBRARIES 0 MPI_LIBRARY_WORK)
set(MPI_LIBRARY ${MPI_LIBRARY_WORK} CACHE FILEPATH "MPI library to link against" FORCE)
else (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND" CACHE FILEPATH "MPI library to link against" FORCE)
endif (MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
if (MPI_NUMLIBS GREATER 1)
set(MPI_EXTRA_LIBRARY_WORK ${MPI_LIBRARIES})
list(REMOVE_AT MPI_EXTRA_LIBRARY_WORK 0)
set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY_WORK} CACHE STRING "Extra MPI libraries to link against" FORCE)
else (MPI_NUMLIBS GREATER 1)
set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND" CACHE STRING "Extra MPI libraries to link against" FORCE)
endif (MPI_NUMLIBS GREATER 1)
# Set up all of the appropriate cache entries
set(MPI_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI compilation flags" FORCE)
set(MPI_INCLUDE_PATH ${MPI_INCLUDE_PATH_WORK} CACHE STRING "MPI include path" FORCE)
set(MPI_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
else (MPI_COMPILE_CMDLINE)
# No MPI compiler to interogate so attempt to find everything with find functions.
find_path(MPI_INCLUDE_PATH mpi.h
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
PATH_SUFFIXES include
)
# Decide between 32-bit and 64-bit libraries for Microsoft's MPI
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if("${CMAKE_SIZEOF_VOID_P}" EQUAL 8)
set(MS_MPI_ARCH_DIR amd64)
else()
set(MS_MPI_ARCH_DIR i386)
endif()
find_library(MPI_LIBRARY
NAMES mpi mpich msmpi
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
PATH_SUFFIXES lib lib/${MS_MPI_ARCH_DIR} Lib Lib/${MS_MPI_ARCH_DIR}
)
find_library(MPI_EXTRA_LIBRARY
NAMES mpi++
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
PATH_SUFFIXES lib
DOC "Extra MPI libraries to link against.")
set(MPI_COMPILE_FLAGS "" CACHE STRING "MPI compilation flags")
set(MPI_LINK_FLAGS "" CACHE STRING "MPI linking flags")
endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
# Set up extra variables to conform to
if (MPI_EXTRA_LIBRARY)
set(MPI_LIBRARIES ${MPI_LIBRARY} ${MPI_EXTRA_LIBRARY})
else (MPI_EXTRA_LIBRARY)
set(MPI_LIBRARIES ${MPI_LIBRARY})
endif (MPI_EXTRA_LIBRARY)
if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
set(MPI_FOUND TRUE)
else (MPI_INCLUDE_PATH AND MPI_LIBRARY)
set(MPI_FOUND FALSE)
endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
include(FindPackageHandleStandardArgs)
# handle the QUIETLY and REQUIRED arguments
find_package_handle_standard_args(MPI DEFAULT_MSG MPI_LIBRARY MPI_INCLUDE_PATH)
mark_as_advanced(MPI_INCLUDE_PATH MPI_COMPILE_FLAGS MPI_LINK_FLAGS MPI_LIBRARY
MPI_EXTRA_LIBRARY)
# unset to cleanup namespace
unset(_MPI_PACKAGE_DIR)
unset(_MPI_PREFIX_PATH)
unset(_MPI_BASE_DIR)