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
# ${MPIEXEC_POSTFLAGS} ARGS
# where PROCS is the number of processors on which to execute the program,
# EXECUTABLE is the MPI program, and ARGS are the arguments to pass to the
# MPI program.
# Try to find the MPI driver program
find_program(MPI_COMPILER
NAMES mpic++ mpicxx mpiCC mpicc
DOC "MPI compiler. Used only to detect MPI compilation flags.")
mark_as_advanced(MPI_COMPILER)
find_program(MPIEXEC
NAMES mpiexec mpirun lamexec
DOC "Executable for running MPI programs.")
set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify the number of processes for MPIEXEC; the next option will be the number of processes.")
set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS
MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
# the cache, and we don't want to override those settings.
elseif (MPI_COMPILER)
# Check whether the -showme:compile option works. This indicates
# that we have either Open MPI or a newer version of LAM-MPI, and
# implies that -showme:link will also work.
exec_program(${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(${MPI_COMPILER}
ARGS -showme:link
OUTPUT_VARIABLE MPI_LINK_CMDLINE
RETURN_VALUE MPI_COMPILER_RETURN)
endif (MPI_COMPILER_RETURN EQUAL 0)
if (MPI_COMPILER_RETURN EQUAL 0)
# Do nothing: we have our command lines now
else (MPI_COMPILER_RETURN EQUAL 0)
# Older versions of LAM-MPI have "-showme". Try it.
exec_program(${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 ${MPI_COMPILER}")
endif (MPI_COMPILER_RETURN EQUAL 0)
endif (MPI_INCLUDE_PATH AND MPI_LIBRARY)
if (MPI_INCLUDE_PATH AND MPI_LIBRARY)
# Do nothing: we already have MPI_INCLUDE_PATH and MPI_LIBRARY in
# the cache, and we don't want to override those settings.
elseif (MPI_COMPILE_CMDLINE)
# Extract compile flags from the compile command line.
string(REGEX MATCHALL "-D([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS "${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 ${IPATH})
endforeach(IPATH)
# Extract linker paths from the link command line
string(REGEX MATCHALL "-L([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_PATHS "${MPI_LINK_CMDLINE}")
set(MPI_LINK_PATH)
foreach(LPATH ${MPI_ALL_LINK_PATHS})
string(REGEX REPLACE "^-L" "" LPATH ${LPATH})
string(REGEX REPLACE "//" "/" LPATH ${LPATH})
list(APPEND MPI_LINK_PATH ${LPATH})
endforeach(LPATH)
2007-06-22 18:22:27 +04:00
# Extract linker flags from the link command line
string(REGEX MATCHALL "-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${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} PATHS ${MPI_LINK_PATH})
if (MPI_LIB)
list(APPEND MPI_LIBRARIES ${MPI_LIB})
else (MPI_LIB)
status(ERROR "Unable to find MPI library ${LIB}")
endif (MPI_LIB)
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)
if (MPI_NUMLIBS GREATER 0)
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 GREATER 0)
set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND" CACHE STRING "MPI library to link against" FORCE)
endif (MPI_NUMLIBS GREATER 0)
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 ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI linking flags" FORCE)
else (MPI_COMPILE_CMDLINE)
find_path(MPI_INCLUDE_PATH mpi.h
/usr/local/include
/usr/include
/usr/include/mpi
/usr/local/mpi/include
"C:/Program Files/MPICH/SDK/Include"
"$ENV{SystemDrive}/Program Files/MPICH2/include"
"$ENV{SystemDrive}/Program Files/Microsoft Compute Cluster Pack/Include"
)
# TODO: How do we know whether we're building 32-bit vs. 64-bit for MS-MPI?
find_library(MPI_LIBRARY
NAMES mpi mpich
PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
"C:/Program Files/MPICH/SDK/Lib"
"$ENV{SystemDrive}/Program Files/MPICH/SDK/Lib"
"$ENV{SystemDrive}/Program Files/Microsoft Compute Cluster Pack/Lib/i386"
)
find_library(MPI_LIBRARY
NAMES mpich2
PATHS
"$ENV{SystemDrive}/Program Files/MPICH2/Lib")
find_library(MPI_EXTRA_LIBRARY
NAMES mpi++
PATHS /usr/lib /usr/local/lib /usr/local/mpi/lib
"C:/Program Files/MPICH/SDK/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)
# on BlueGene/L the MPI lib is named libmpich.rts.a, there also these additional libs are required
if("${MPI_LIBRARY}" MATCHES "mpich.rts")
set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
set(MPI_LIBRARY ${MPI_LIBRARY} msglayer.rts devices.rts rts.rts devices.rts)
endif("${MPI_LIBRARY}" MATCHES "mpich.rts")
# 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)