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FindMPI.cmake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# FindMPI
# -------
#
# Find a Message Passing Interface (MPI) implementation.
#
# The Message Passing Interface (MPI) is a library used to write
# high-performance distributed-memory parallel applications, and is
# typically deployed on a cluster. MPI is a standard interface (defined
# by the MPI forum) for which many implementations are available.
#
# Variables for using MPI
# ^^^^^^^^^^^^^^^^^^^^^^^
#
# The module exposes the components ``C``, ``CXX``, ``MPICXX`` and ``Fortran``.
# Each of these controls the various MPI languages to search for.
# The difference between ``CXX`` and ``MPICXX`` is that ``CXX`` refers to the
# MPI C API being usable from C++, whereas ``MPICXX`` refers to the MPI-2 C++ API
# that was removed again in MPI-3.
#
# Depending on the enabled components the following variables will be set:
#
# ``MPI_FOUND``
# Variable indicating that MPI settings for all requested languages have been found.
# If no components are specified, this is true if MPI settings for all enabled languages
# were detected. Note that the ``MPICXX`` component does not affect this variable.
# ``MPI_VERSION``
# Minimal version of MPI detected among the requested languages, or all enabled languages
# if no components were specified.
#
# This module will set the following variables per language in your
# project, where ``<lang>`` is one of C, CXX, or Fortran:
#
# ``MPI_<lang>_FOUND``
# Variable indicating the MPI settings for ``<lang>`` were found and that
# simple MPI test programs compile with the provided settings.
# ``MPI_<lang>_COMPILER``
# MPI compiler for ``<lang>`` if such a program exists.
# ``MPI_<lang>_COMPILE_OPTIONS``
# Compilation options for MPI programs in ``<lang>``, given as a :ref:`;-list <CMake Language Lists>`.
# ``MPI_<lang>_COMPILE_DEFINITIONS``
# Compilation definitions for MPI programs in ``<lang>``, given as a :ref:`;-list <CMake Language Lists>`.
# ``MPI_<lang>_INCLUDE_DIRS``
# Include path(s) for MPI header.
# ``MPI_<lang>_LINK_FLAGS``
# Linker flags for MPI programs.
# ``MPI_<lang>_LIBRARIES``
# All libraries to link MPI programs against.
#
# Additionally, the following :prop_tgt:`IMPORTED` targets are defined:
#
# ``MPI::MPI_<lang>``
# Target for using MPI from ``<lang>``.
#
# The following variables indicating which bindings are present will be defined:
#
# ``MPI_MPICXX_FOUND``
# Variable indicating whether the MPI-2 C++ bindings are present (introduced in MPI-2, removed with MPI-3).
# ``MPI_Fortran_HAVE_F77_HEADER``
# True if the Fortran 77 header ``mpif.h`` is available.
# ``MPI_Fortran_HAVE_F90_MODULE``
# True if the Fortran 90 module ``mpi`` can be used for accessing MPI (MPI-2 and higher only).
# ``MPI_Fortran_HAVE_F08_MODULE``
# True if the Fortran 2008 ``mpi_f08`` is available to MPI programs (MPI-3 and higher only).
#
# If possible, the MPI version will be determined by this module. The facilities to detect the MPI version
# were introduced with MPI-1.2, and therefore cannot be found for older MPI versions.
#
# ``MPI_<lang>_VERSION_MAJOR``
# Major version of MPI implemented for ``<lang>`` by the MPI distribution.
# ``MPI_<lang>_VERSION_MINOR``
# Minor version of MPI implemented for ``<lang>`` by the MPI distribution.
# ``MPI_<lang>_VERSION``
# MPI version implemented for ``<lang>`` by the MPI distribution.
#
# Note that there's no variable for the C bindings being accessible through ``mpi.h``, since the MPI standards
# always have required this binding to work in both C and C++ code.
#
# For running MPI programs, the module sets the following variables
#
# ``MPIEXEC_EXECUTABLE``
# Executable for running MPI programs, if such exists.
# ``MPIEXEC_NUMPROC_FLAG``
# Flag to pass to ``mpiexec`` before giving it the number of processors to run on.
# ``MPIEXEC_MAX_NUMPROCS``
# Number of MPI processors to utilize. Defaults to the number
# of processors detected on the host system.
# ``MPIEXEC_PREFLAGS``
# Flags to pass to ``mpiexec`` directly before the executable to run.
# ``MPIEXEC_POSTFLAGS``
# Flags to pass to ``mpiexec`` after other flags.
#
# Variables for locating MPI
# ^^^^^^^^^^^^^^^^^^^^^^^^^^
#
# This module performs a three step search for an MPI implementation:
#
# 1. Check if the compiler has MPI support built-in. This is the case if the user passed a
# compiler wrapper as ``CMAKE_<LANG>_COMPILER`` or if they're on a Cray system.
# 2. Attempt to find an MPI compiler wrapper and determine the compiler information from it.
# 3. Try to find an MPI implementation that does not ship such a wrapper by guessing settings.
# Currently, only Microsoft MPI and MPICH2 on Windows are supported.
#
# For controlling the second step, the following variables may be set:
#
# ``MPI_<lang>_COMPILER``
# Search for the specified compiler wrapper and use it.
# ``MPI_<lang>_COMPILER_FLAGS``
# Flags to pass to the MPI compiler wrapper during interrogation. Some compiler wrappers
# support linking debug or tracing libraries if a specific flag is passed and this variable
# may be used to obtain them.
# ``MPI_COMPILER_FLAGS``
# Used to initialize ``MPI_<lang>_COMPILER_FLAGS`` if no language specific flag has been given.
# Empty by default.
# ``MPI_EXECUTABLE_SUFFIX``
# A suffix which is appended to all names that are being looked for. For instance you may set this
# to ``.mpich`` or ``.openmpi`` to prefer the one or the other on Debian and its derivatives.
#
# In order to control the guessing step, the following variable may be set:
#
# ``MPI_GUESS_LIBRARY_NAME``
# Valid values are ``MSMPI`` and ``MPICH2``. If set, only the given library will be searched for.
# By default, ``MSMPI`` will be preferred over ``MPICH2`` if both are available.
# This also sets ``MPI_SKIP_COMPILER_WRAPPER`` to ``true``, which may be overridden.
#
# Each of the search steps may be skipped with the following control variables:
#
# ``MPI_ASSUME_NO_BUILTIN_MPI``
# If true, the module assumes that the compiler itself does not provide an MPI implementation and
# skips to step 2.
# ``MPI_SKIP_COMPILER_WRAPPER``
# If true, no compiler wrapper will be searched for.
# ``MPI_SKIP_GUESSING``
# If true, the guessing step will be skipped.
#
# Additionally, the following control variable is available to change search behavior:
#
# ``MPI_CXX_SKIP_MPICXX``
# Add some definitions that will disable the MPI-2 C++ bindings.
# Currently supported are MPICH, Open MPI, Platform MPI and derivatives thereof,
# for example MVAPICH or Intel MPI.
#
# If the find procedure fails for a variable ``MPI_<lang>_WORKS``, then the settings detected by or passed to
# the module did not work and even a simple MPI test program failed to compile.
#
# If all of these parameters were not sufficient to find the right MPI implementation, a user may
# disable the entire autodetection process by specifying both a list of libraries in ``MPI_<lang>_LIBRARIES``
# and a list of include directories in ``MPI_<lang>_ADDITIONAL_INCLUDE_DIRS``.
# Any other variable may be set in addition to these two. The module will then validate the MPI settings and store the
# settings in the cache.
#
# Cache variables for MPI
# ^^^^^^^^^^^^^^^^^^^^^^^
#
# The variable ``MPI_<lang>_INCLUDE_DIRS`` will be assembled from the following variables.
# For C and CXX:
#
# ``MPI_<lang>_HEADER_DIR``
# Location of the ``mpi.h`` header on disk.
#
# For Fortran:
#
# ``MPI_Fortran_F77_HEADER_DIR``
# Location of the Fortran 77 header ``mpif.h``, if it exists.
# ``MPI_Fortran_MODULE_DIR``
# Location of the ``mpi`` or ``mpi_f08`` modules, if available.
#
# For all languages the following variables are additionally considered:
#
# ``MPI_<lang>_ADDITIONAL_INCLUDE_DIRS``
# A :ref:`;-list <CMake Language Lists>` of paths needed in addition to the normal include directories.
# ``MPI_<include_name>_INCLUDE_DIR``
# Path variables for include folders referred to by ``<include_name>``.
# ``MPI_<lang>_ADDITIONAL_INCLUDE_VARS``
# A :ref:`;-list <CMake Language Lists>` of ``<include_name>`` that will be added to the include locations of ``<lang>``.
#
# The variable ``MPI_<lang>_LIBRARIES`` will be assembled from the following variables:
#
# ``MPI_<lib_name>_LIBRARY``
# The location of a library called ``<lib_name>`` for use with MPI.
# ``MPI_<lang>_LIB_NAMES``
# A :ref:`;-list <CMake Language Lists>` of ``<lib_name>`` that will be added to the include locations of ``<lang>``.
#
# Usage of mpiexec
# ^^^^^^^^^^^^^^^^
#
# When using ``MPIEXEC_EXECUTABLE`` to execute MPI applications, you should typically
# use all of the ``MPIEXEC_EXECUTABLE`` flags as follows:
#
# ::
#
# ${MPIEXEC_EXECUTABLE} ${MPIEXEC_NUMPROC_FLAG} ${MPIEXEC_MAX_NUMPROCS}
# ${MPIEXEC_PREFLAGS} EXECUTABLE ${MPIEXEC_POSTFLAGS} ARGS
#
# where ``EXECUTABLE`` is the MPI program, and ``ARGS`` are the arguments to
# pass to the MPI program.
#
# Advanced variables for using MPI
# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#
# The module can perform some advanced feature detections upon explicit request.
#
# **Important notice:** The following checks cannot be performed without *executing* an MPI test program.
# Consider the special considerations for the behavior of :command:`try_run` during cross compilation.
# Moreover, running an MPI program can cause additional issues, like a firewall notification on some systems.
# You should only enable these detections if you absolutely need the information.
#
# If the following variables are set to true, the respective search will be performed:
#
# ``MPI_DETERMINE_Fortran_CAPABILITIES``
# Determine for all available Fortran bindings what the values of ``MPI_SUBARRAYS_SUPPORTED`` and
# ``MPI_ASYNC_PROTECTS_NONBLOCKING`` are and make their values available as ``MPI_Fortran_<binding>_SUBARRAYS``
# and ``MPI_Fortran_<binding>_ASYNCPROT``, where ``<binding>`` is one of ``F77_HEADER``, ``F90_MODULE`` and
# ``F08_MODULE``.
# ``MPI_DETERMINE_LIBRARY_VERSION``
# For each language, find the output of ``MPI_Get_library_version`` and make it available as ``MPI_<lang>_LIBRARY_VERSION``.
# This information is usually tied to the runtime component of an MPI implementation and might differ depending on ``<lang>``.
# Note that the return value is entirely implementation defined. This information might be used to identify
# the MPI vendor and for example pick the correct one of multiple third party binaries that matches the MPI vendor.
#
# Backward Compatibility
# ^^^^^^^^^^^^^^^^^^^^^^
#
# For backward compatibility with older versions of FindMPI, these
# variables are set, but deprecated:
#
# ::
#
# MPI_COMPILER MPI_LIBRARY MPI_EXTRA_LIBRARY
# MPI_COMPILE_FLAGS MPI_INCLUDE_PATH MPI_LINK_FLAGS
# MPI_LIBRARIES
#
# In new projects, please use the ``MPI_<lang>_XXX`` equivalents.
# Additionally, the following variables are deprecated:
#
# ``MPI_<lang>_COMPILE_FLAGS``
# Use ``MPI_<lang>_COMPILE_OPTIONS`` and ``MPI_<lang>_COMPILE_DEFINITIONS`` instead.
# ``MPI_<lang>_INCLUDE_PATH``
# For consumption use ``MPI_<lang>_INCLUDE_DIRS`` and for specifying folders use ``MPI_<lang>_ADDITIONAL_INCLUDE_DIRS`` instead.
# ``MPIEXEC``
# Use ``MPIEXEC_EXECUTABLE`` instead.
cmake_policy(PUSH)
cmake_policy(SET CMP0057 NEW) # if IN_LIST
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
# Generic compiler names
set(_MPI_C_GENERIC_COMPILER_NAMES mpicc mpcc mpicc_r mpcc_r)
set(_MPI_CXX_GENERIC_COMPILER_NAMES mpicxx mpiCC mpcxx mpCC mpic++ mpc++
mpicxx_r mpiCC_r mpcxx_r mpCC_r mpic++_r mpc++_r)
set(_MPI_Fortran_GENERIC_COMPILER_NAMES mpif95 mpif95_r mpf95 mpf95_r
mpif90 mpif90_r mpf90 mpf90_r
mpif77 mpif77_r mpf77 mpf77_r
mpifc)
# GNU compiler names
set(_MPI_GNU_C_COMPILER_NAMES mpigcc mpgcc mpigcc_r mpgcc_r)
set(_MPI_GNU_CXX_COMPILER_NAMES mpig++ mpg++ mpig++_r mpg++_r mpigxx)
set(_MPI_GNU_Fortran_COMPILER_NAMES mpigfortran mpgfortran mpigfortran_r mpgfortran_r
mpig77 mpig77_r mpg77 mpg77_r)
# Intel MPI compiler names on Windows
if(WIN32)
list(APPEND _MPI_C_GENERIC_COMPILER_NAMES mpicc.bat)
list(APPEND _MPI_CXX_GENERIC_COMPILER_NAMES mpicxx.bat)
list(APPEND _MPI_Fortran_GENERIC_COMPILER_NAMES mpifc.bat)
# Intel MPI compiler names
set(_MPI_Intel_C_COMPILER_NAMES mpiicc.bat)
set(_MPI_Intel_CXX_COMPILER_NAMES mpiicpc.bat)
set(_MPI_Intel_Fortran_COMPILER_NAMES mpiifort.bat mpif77.bat mpif90.bat)
# Intel MPI compiler names for MSMPI
set(_MPI_MSVC_C_COMPILER_NAMES mpicl.bat)
set(_MPI_MSVC_CXX_COMPILER_NAMES mpicl.bat)
else()
# Intel compiler names
set(_MPI_Intel_C_COMPILER_NAMES mpiicc)
set(_MPI_Intel_CXX_COMPILER_NAMES mpiicpc mpiicxx mpiic++)
set(_MPI_Intel_Fortran_COMPILER_NAMES mpiifort mpiif95 mpiif90 mpiif77)
endif()
# PGI compiler names
set(_MPI_PGI_C_COMPILER_NAMES mpipgcc mppgcc)
set(_MPI_PGI_CXX_COMPILER_NAMES mpipgCC mppgCC)
set(_MPI_PGI_Fortran_COMPILER_NAMES mpipgf95 mpipgf90 mppgf95 mppgf90 mpipgf77 mppgf77)
# XLC MPI Compiler names
set(_MPI_XL_C_COMPILER_NAMES mpxlc mpxlc_r mpixlc mpixlc_r)
set(_MPI_XL_CXX_COMPILER_NAMES mpixlcxx mpixlC mpixlc++ mpxlcxx mpxlc++ mpixlc++ mpxlCC
mpixlcxx_r mpixlC_r mpixlc++_r mpxlcxx_r mpxlc++_r mpixlc++_r mpxlCC_r)
set(_MPI_XL_Fortran_COMPILER_NAMES mpixlf95 mpixlf95_r mpxlf95 mpxlf95_r
mpixlf90 mpixlf90_r mpxlf90 mpxlf90_r
mpixlf77 mpixlf77_r mpxlf77 mpxlf77_r
mpixlf mpixlf_r mpxlf mpxlf_r)
# Prepend vendor-specific compiler wrappers to the list. If we don't know the compiler,
# attempt all of them.
# By attempting vendor-specific compiler names first, we should avoid situations where the compiler wrapper
# stems from a proprietary MPI and won't know which compiler it's being used for. For instance, Intel MPI
# controls its settings via the I_MPI_CC environment variables if the generic name is being used.
# If we know which compiler we're working with, we can use the most specialized wrapper there is in order to
# pick up the right settings for it.
foreach (LANG IN ITEMS C CXX Fortran)
set(_MPI_${LANG}_COMPILER_NAMES "")
foreach (id IN ITEMS GNU Intel MSVC PGI XL)
if (NOT CMAKE_${LANG}_COMPILER_ID OR CMAKE_${LANG}_COMPILER_ID STREQUAL id)
list(APPEND _MPI_${LANG}_COMPILER_NAMES ${_MPI_${id}_${LANG}_COMPILER_NAMES}${MPI_EXECUTABLE_SUFFIX})
endif()
unset(_MPI_${id}_${LANG}_COMPILER_NAMES)
endforeach()
list(APPEND _MPI_${LANG}_COMPILER_NAMES ${_MPI_${LANG}_GENERIC_COMPILER_NAMES}${MPI_EXECUTABLE_SUFFIX})
unset(_MPI_${LANG}_GENERIC_COMPILER_NAMES)
endforeach()
# Names to try for mpiexec
# Only mpiexec commands are guaranteed to behave as described in the standard,
# mpirun commands are not covered by the standard in any way whatsoever.
# lamexec is the executable for LAM/MPI, srun is for SLURM or Open MPI with SLURM support.
# srun -n X <executable> is however a valid command, so it behaves 'like' mpiexec.
set(_MPIEXEC_NAMES_BASE mpiexec mpiexec.hydra mpiexec.mpd mpirun lamexec srun)
unset(_MPIEXEC_NAMES)
foreach(_MPIEXEC_NAME IN LISTS _MPIEXEC_NAMES_BASE)
list(APPEND _MPIEXEC_NAMES "${_MPIEXEC_NAME}${MPI_EXECUTABLE_SUFFIX}")
endforeach()
unset(_MPIEXEC_NAMES_BASE)
function (_MPI_check_compiler LANG QUERY_FLAG OUTPUT_VARIABLE RESULT_VARIABLE)
if(DEFINED MPI_${LANG}_COMPILER_FLAGS)
separate_arguments(_MPI_COMPILER_WRAPPER_OPTIONS NATIVE_COMMAND "${MPI_${LANG}_COMPILER_FLAGS}")
else()
separate_arguments(_MPI_COMPILER_WRAPPER_OPTIONS NATIVE_COMMAND "${MPI_COMPILER_FLAGS}")
endif()
execute_process(
COMMAND ${MPI_${LANG}_COMPILER} ${_MPI_COMPILER_WRAPPER_OPTIONS} ${QUERY_FLAG}
OUTPUT_VARIABLE WRAPPER_OUTPUT OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE WRAPPER_OUTPUT ERROR_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE WRAPPER_RETURN)
# Some compiler wrappers will yield spurious zero return values, for example
# Intel MPI tolerates unknown arguments and if the MPI wrappers loads a shared
# library that has invalid or missing version information there would be warning
# messages emitted by ld.so in the compiler output. In either case, we'll treat
# the output as invalid.
if("${WRAPPER_OUTPUT}" MATCHES "undefined reference|unrecognized|need to set|no version information available|command not found")
set(WRAPPER_RETURN 255)
endif()
# Ensure that no error output might be passed upwards.
if(NOT WRAPPER_RETURN EQUAL 0)
unset(WRAPPER_OUTPUT)
else()
# Strip leading whitespace
string(REGEX REPLACE "^ +" "" WRAPPER_OUTPUT "${WRAPPER_OUTPUT}")
endif()
set(${OUTPUT_VARIABLE} "${WRAPPER_OUTPUT}" PARENT_SCOPE)
set(${RESULT_VARIABLE} "${WRAPPER_RETURN}" PARENT_SCOPE)
endfunction()
macro(_MPI_env_set_ifnot VAR VALUE)
if(NOT DEFINED ENV{${VAR}})
set(_MPI_${VAR}_WAS_SET FALSE)
set(ENV{${VAR}} ${${VALUE}})
else()
set(_MPI_${VAR}_WAS_SET TRUE)
endif()
endmacro()
macro(_MPI_env_unset_ifnot VAR)
if(NOT _MPI_${VAR}_WAS_SET)
unset(ENV{${VAR}})
endif()
endmacro()
function (_MPI_interrogate_compiler LANG)
unset(MPI_COMPILE_CMDLINE)
unset(MPI_LINK_CMDLINE)
unset(MPI_COMPILE_OPTIONS_WORK)
unset(MPI_COMPILE_DEFINITIONS_WORK)
unset(MPI_INCLUDE_DIRS_WORK)
unset(MPI_LINK_FLAGS_WORK)
unset(MPI_LIB_NAMES_WORK)
unset(MPI_LIB_FULLPATHS_WORK)
# Define the MPICH and Intel MPI compiler variables to the compilers set in CMake.
# It's possible to have a per-compiler configuration in these MPI implementations and
# a particular MPICH derivate might check compiler interoperability.
# Intel MPI in particular does this with I_MPI_CHECK_COMPILER.
file(TO_NATIVE_PATH "${CMAKE_${LANG}_COMPILER}" _MPI_UNDERLAYING_COMPILER)
# On Windows, the Intel MPI batch scripts can only work with filnames - Full paths will break them.
# Due to the lack of other MPICH-based wrappers for Visual C++, we may treat this as default.
if(MSVC)
get_filename_component(_MPI_UNDERLAYING_COMPILER "${_MPI_UNDERLAYING_COMPILER}" NAME)
endif()
if("${LANG}" STREQUAL "C")
_MPI_env_set_ifnot(I_MPI_CC _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(MPICH_CC _MPI_UNDERLAYING_COMPILER)
elseif("${LANG}" STREQUAL "CXX")
_MPI_env_set_ifnot(I_MPI_CXX _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(MPICH_CXX _MPI_UNDERLAYING_COMPILER)
elseif("${LANG}" STREQUAL "Fortran")
_MPI_env_set_ifnot(I_MPI_FC _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(MPICH_FC _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(I_MPI_F77 _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(MPICH_F77 _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(I_MPI_F90 _MPI_UNDERLAYING_COMPILER)
_MPI_env_set_ifnot(MPICH_F90 _MPI_UNDERLAYING_COMPILER)
endif()
# Set these two variables for Intel MPI:
# - I_MPI_DEBUG_INFO_STRIP: It adds 'objcopy' lines to the compiler output. We support stripping them
# (see below), but if we can avoid them in the first place, we should.
# - I_MPI_FORT_BIND: By default Intel MPI makes the C/C++ compiler wrappers link Fortran bindings.
# This is so that mixed-language code doesn't require additional libraries when linking with mpicc.
# For our purposes, this makes little sense, since correct MPI usage from CMake already circumvenes this.
set(_MPI_ENV_VALUE "disable")
_MPI_env_set_ifnot(I_MPI_DEBUG_INFO_STRIP _MPI_ENV_VALUE)
_MPI_env_set_ifnot(I_MPI_FORT_BIND _MPI_ENV_VALUE)
# Check whether the -showme:compile option works. This indicates that we have either Open MPI
# or a newer version of LAM/MPI, and implies that -showme:link will also work.
# Open MPI also supports -show, but separates linker and compiler information
_MPI_check_compiler(${LANG} "-showme:compile" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
if (MPI_COMPILER_RETURN EQUAL 0)
_MPI_check_compiler(${LANG} "-showme:link" MPI_LINK_CMDLINE MPI_COMPILER_RETURN)
if (NOT MPI_COMPILER_RETURN EQUAL 0)
unset(MPI_COMPILE_CMDLINE)
endif()
endif()
# MPICH and MVAPICH offer -compile-info and -link-info.
# For modern versions, both do the same as -show. However, for old versions, they do differ
# when called for mpicxx and mpif90 and it's necessary to use them over -show in order to find the
# removed MPI C++ bindings.
if (NOT MPI_COMPILER_RETURN EQUAL 0)
_MPI_check_compiler(${LANG} "-compile-info" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
if (MPI_COMPILER_RETURN EQUAL 0)
_MPI_check_compiler(${LANG} "-link-info" MPI_LINK_CMDLINE MPI_COMPILER_RETURN)
if (NOT MPI_COMPILER_RETURN EQUAL 0)
unset(MPI_COMPILE_CMDLINE)
endif()
endif()
endif()
# MPICH, MVAPICH2 and Intel MPI just use "-show". Open MPI also offers this, but the
# -showme commands are more specialized.
if (NOT MPI_COMPILER_RETURN EQUAL 0)
_MPI_check_compiler(${LANG} "-show" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
endif()
# Older versions of LAM/MPI have "-showme". Open MPI also supports this.
# Unknown to MPICH, MVAPICH and Intel MPI.
if (NOT MPI_COMPILER_RETURN EQUAL 0)
_MPI_check_compiler(${LANG} "-showme" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
endif()
if (MPI_COMPILER_RETURN EQUAL 0 AND DEFINED MPI_COMPILE_CMDLINE)
# Intel MPI can be run with -compchk or I_MPI_CHECK_COMPILER set to 1.
# In this case, -show will be prepended with a line to the compiler checker. This is a script that performs
# compatibility checks and returns a non-zero exit code together with an error if something fails.
# It has to be called as "compchk.sh <arch> <compiler>". Here, <arch> is one out of 32 (i686), 64 (ia64) or 32e (x86_64).
# The compiler is identified by filename, and can be either the MPI compiler or the underlying compiler.
# NOTE: It is vital to run this script while the environment variables are set up, otherwise it can check the wrong compiler.
if("${MPI_COMPILE_CMDLINE}" MATCHES "^([^\" ]+/compchk.sh|\"[^\"]+/compchk.sh\") +([^ ]+)")
# Now CMAKE_MATCH_1 contains the path to the compchk.sh file and CMAKE_MATCH_2 the architecture flag.
unset(COMPILER_CHECKER_OUTPUT)
execute_process(
COMMAND ${CMAKE_MATCH_1} ${CMAKE_MATCH_2} ${MPI_${LANG}_COMPILER}
OUTPUT_VARIABLE COMPILER_CHECKER_OUTPUT OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE COMPILER_CHECKER_OUTPUT ERROR_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE MPI_COMPILER_RETURN)
# If it returned a non-zero value, the check below will fail and cause the interrogation to be aborted.
if(NOT MPI_COMPILER_RETURN EQUAL 0)
if(NOT MPI_FIND_QUIETLY)
message(STATUS "Intel MPI compiler check failed: ${COMPILER_CHECKER_OUTPUT}")
endif()
else()
# Since the check passed, we can remove the compchk.sh script.
string(REGEX REPLACE "^([^\" ]+|\"[^\"]+\")/compchk.sh.*\n" "" MPI_COMPILE_CMDLINE "${MPI_COMPILE_CMDLINE}")
endif()
endif()
endif()
# Revert changes to the environment made previously
if("${LANG}" STREQUAL "C")
_MPI_env_unset_ifnot(I_MPI_CC)
_MPI_env_unset_ifnot(MPICH_CC)
elseif("${LANG}" STREQUAL "CXX")
_MPI_env_unset_ifnot(I_MPI_CXX)
_MPI_env_unset_ifnot(MPICH_CXX)
elseif("${LANG}" STREQUAL "Fortran")
_MPI_env_unset_ifnot(I_MPI_FC)
_MPI_env_unset_ifnot(MPICH_FC)
_MPI_env_unset_ifnot(I_MPI_F77)
_MPI_env_unset_ifnot(MPICH_F77)
_MPI_env_unset_ifnot(I_MPI_F90)
_MPI_env_unset_ifnot(MPICH_F90)
endif()
_MPI_env_unset_ifnot(I_MPI_DEBUG_INFO_STRIP)
_MPI_env_unset_ifnot(I_MPI_FORT_BIND)
if (NOT (MPI_COMPILER_RETURN EQUAL 0) OR NOT (DEFINED MPI_COMPILE_CMDLINE))
# Cannot interrogate this compiler, so exit.
set(MPI_${LANG}_WRAPPER_FOUND FALSE PARENT_SCOPE)
return()
endif()
unset(MPI_COMPILER_RETURN)
# We have our command lines, but we might need to copy MPI_COMPILE_CMDLINE
# into MPI_LINK_CMDLINE, if we didn't find the link line.
if (NOT DEFINED MPI_LINK_CMDLINE)
set(MPI_LINK_CMDLINE "${MPI_COMPILE_CMDLINE}")
endif()
# Visual Studio parsers permit each flag prefixed by either / or -.
# We'll normalize this to the - syntax we use for CMake purposes anyways.
if(MSVC)
foreach(_MPI_VARIABLE IN ITEMS COMPILE LINK)
# The Intel MPI wrappers on Windows prefix their output with some copyright boilerplate.
# To prevent possible problems, we discard this text before proceeding with any further matching.
string(REGEX REPLACE "^[^ ]+ for the Intel\\(R\\) MPI Library [^\n]+ for Windows\\*\nCopyright\\(C\\) [^\n]+, Intel Corporation\\. All rights reserved\\.\n\n" ""
MPI_${_MPI_VARIABLE}_CMDLINE "${MPI_${_MPI_VARIABLE}_CMDLINE}")
string(REGEX REPLACE "(^| )/" "\\1-" MPI_${_MPI_VARIABLE}_CMDLINE "${MPI_${_MPI_VARIABLE}_CMDLINE}")
string(REPLACE "-libpath:" "-LIBPATH:" MPI_${_MPI_VARIABLE}_CMDLINE "${MPI_${_MPI_VARIABLE}_CMDLINE}")
endforeach()
endif()
# For MSVC and cl-compatible compilers, the keyword /link indicates a point after which
# everything following is passed to the linker. In this case, we drop all prior information
# from the link line and treat any unknown extra flags as linker flags.
set(_MPI_FILTERED_LINK_INFORMATION FALSE)
if(MSVC)
if(MPI_LINK_CMDLINE MATCHES " -(link|LINK) ")
string(REGEX REPLACE ".+-(link|LINK) +" "" MPI_LINK_CMDLINE "${MPI_LINK_CMDLINE}")
set(_MPI_FILTERED_LINK_INFORMATION TRUE)
endif()
string(REGEX REPLACE " +-(link|LINK) .+" "" MPI_COMPILE_CMDLINE "${MPI_COMPILE_CMDLINE}")
endif()
if(UNIX)
# At this point, we obtained some output from a compiler wrapper that works.
# We'll now try to parse it into variables with meaning to us.
if("${LANG}" STREQUAL "Fortran")
# If MPICH (and derivates) didn't recognize the Fortran compiler include flag during configuration,
# they'll return a set of three commands, consisting out of a symlink command for mpif.h,
# the actual compiler command and deletion of the created symlink.
# Especially with M(VA)PICH-1, this appears to happen erroneously, and therefore we should translate
# this output into an additional include directory and then drop it from the output.
if("${MPI_COMPILE_CMDLINE}" MATCHES "^ln -s ([^\" ]+|\"[^\"]+\") mpif.h")
get_filename_component(MPI_INCLUDE_DIRS_WORK "${CMAKE_MATCH_1}" DIRECTORY)
string(REGEX REPLACE "^ln -s ([^\" ]+|\"[^\"]+\") mpif.h\n" "" MPI_COMPILE_CMDLINE "${MPI_COMPILE_CMDLINE}")
string(REGEX REPLACE "^ln -s ([^\" ]+|\"[^\"]+\") mpif.h\n" "" MPI_LINK_CMDLINE "${MPI_LINK_CMDLINE}")
string(REGEX REPLACE "\nrm -f mpif.h$" "" MPI_COMPILE_CMDLINE "${MPI_COMPILE_CMDLINE}")
string(REGEX REPLACE "\nrm -f mpif.h$" "" MPI_LINK_CMDLINE "${MPI_LINK_CMDLINE}")
endif()
endif()
# If Intel MPI was configured for static linkage with -static_mpi, the wrapper will by default strip
# debug information from resulting binaries (see I_MPI_DEBUG_INFO_STRIP).
# Since we cannot process this information into CMake logic, we need to discard the resulting objcopy
# commands from the output.
string(REGEX REPLACE "(^|\n)objcopy[^\n]+(\n|$)" "" MPI_COMPILE_CMDLINE "${MPI_COMPILE_CMDLINE}")
string(REGEX REPLACE "(^|\n)objcopy[^\n]+(\n|$)" "" MPI_LINK_CMDLINE "${MPI_LINK_CMDLINE}")
endif()
# For Visual C++, extracting compiler options in a generic fashion isn't easy. However, no MPI implementation
# on Windows seems to require any specific ones, either.
if(NOT MSVC)
# Extract compile options from the compile command line.
string(REGEX MATCHALL "(^| )-f([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_OPTIONS "${MPI_COMPILE_CMDLINE}")
foreach(_MPI_COMPILE_OPTION IN LISTS MPI_ALL_COMPILE_OPTIONS)
string(REGEX REPLACE "^ " "" _MPI_COMPILE_OPTION "${_MPI_COMPILE_OPTION}")
# Ignore -fstack-protector directives: These occur on MPICH and MVAPICH when the libraries
# themselves were built with this flag. However, this flag is unrelated to using MPI, and
# we won't match the accompanying --param-ssp-size and -Wp,-D_FORTIFY_SOURCE flags and therefore
# produce inconsistent results with the regularly flags.
# Similarly, aliasing flags do not belong into our flag array.
if(NOT "${_MPI_COMPILE_OPTION}" MATCHES "^-f((no-|)(stack-protector|strict-aliasing)|PI[CE]|pi[ce])")
list(APPEND MPI_COMPILE_OPTIONS_WORK "${_MPI_COMPILE_OPTION}")
endif()
endforeach()
endif()
# For GNU-style compilers, it's possible to prefix includes and definitions with certain flags to pass them
# only to the preprocessor. For CMake purposes, we need to treat, but ignore such scopings.
# Note that we do not support spaces between the arguments, i.e. -Wp,-I -Wp,/opt/mympi will not be parsed
# correctly. This form does not seem to occur in any common MPI implementation, however.
if(NOT MSVC)
set(_MPI_PREPROCESSOR_FLAG_REGEX "(-Wp,|-Xpreprocessor )?")
else()
set(_MPI_PREPROCESSOR_FLAG_REGEX "")
endif()
# Same deal as above, for the definitions.
string(REGEX MATCHALL "(^| )${_MPI_PREPROCESSOR_FLAG_REGEX}-D *([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_DEFINITIONS "${MPI_COMPILE_CMDLINE}")
foreach(_MPI_COMPILE_DEFINITION IN LISTS MPI_ALL_COMPILE_DEFINITIONS)
string(REGEX REPLACE "^ ?${_MPI_PREPROCESSOR_FLAG_REGEX}-D *" "" _MPI_COMPILE_DEFINITION "${_MPI_COMPILE_DEFINITION}")
string(REPLACE "\"" "" _MPI_COMPILE_DEFINITION "${_MPI_COMPILE_DEFINITION}")
if(NOT "${_MPI_COMPILE_DEFINITION}" MATCHES "^_FORTIFY_SOURCE.*")
list(APPEND MPI_COMPILE_DEFINITIONS_WORK "${_MPI_COMPILE_DEFINITION}")
endif()
endforeach()
# Extract include paths from compile command line
string(REGEX MATCHALL "(^| )${_MPI_PREPROCESSOR_FLAG_REGEX}${CMAKE_INCLUDE_FLAG_${LANG}} *([^\" ]+|\"[^\"]+\")"
MPI_ALL_INCLUDE_PATHS "${MPI_COMPILE_CMDLINE}")
# If extracting failed to work, we'll try using -showme:incdirs.
# Unlike before, we do this without the environment variables set up, but since only MPICH derivates are affected by any of them, and
# -showme:... is only supported by Open MPI and LAM/MPI, this isn't a concern.
if (NOT MPI_ALL_INCLUDE_PATHS)
_MPI_check_compiler(${LANG} "-showme:incdirs" MPI_INCDIRS_CMDLINE MPI_INCDIRS_COMPILER_RETURN)
if(MPI_INCDIRS_COMPILER_RETURN)
separate_arguments(MPI_ALL_INCLUDE_PATHS NATIVE_COMMAND "${MPI_INCDIRS_CMDLINE}")
endif()
endif()
foreach(_MPI_INCLUDE_PATH IN LISTS MPI_ALL_INCLUDE_PATHS)
string(REGEX REPLACE "^ ?${_MPI_PREPROCESSOR_FLAG_REGEX}${CMAKE_INCLUDE_FLAG_${LANG}} *" "" _MPI_INCLUDE_PATH "${_MPI_INCLUDE_PATH}")
string(REPLACE "\"" "" _MPI_INCLUDE_PATH "${_MPI_INCLUDE_PATH}")
get_filename_component(_MPI_INCLUDE_PATH "${_MPI_INCLUDE_PATH}" REALPATH)
list(APPEND MPI_INCLUDE_DIRS_WORK "${_MPI_INCLUDE_PATH}")
endforeach()
# The next step are linker flags and library directories. Here, we first take the flags given in raw -L or -LIBPATH: syntax.
string(REGEX MATCHALL "(^| )${CMAKE_LIBRARY_PATH_FLAG} *([^\" ]+|\"[^\"]+\")" MPI_DIRECT_LINK_PATHS "${MPI_LINK_CMDLINE}")
foreach(_MPI_LPATH IN LISTS MPI_DIRECT_LINK_PATHS)
string(REGEX REPLACE "(^| )${CMAKE_LIBRARY_PATH_FLAG} *" "" _MPI_LPATH "${_MPI_LPATH}")
list(APPEND MPI_ALL_LINK_PATHS "${_MPI_LPATH}")
endforeach()
# If the link commandline hasn't been filtered (e.g. when using MSVC and /link), we need to extract the relevant parts first.
if(NOT _MPI_FILTERED_LINK_INFORMATION)
string(REGEX MATCHALL "(^| )(-Wl,|-Xlinker +)([^\" ]+|\"[^\"]+\")" MPI_LINK_FLAGS "${MPI_LINK_CMDLINE}")
# In this case, we could also find some indirectly given linker paths, e.g. prefixed by -Xlinker or -Wl,
# Since syntaxes like -Wl,-L -Wl,/my/path/to/lib are also valid, we parse these paths by first removing -Wl, and -Xlinker
# from the list of filtered flags and then parse the remainder of the output.
string(REGEX REPLACE "(-Wl,|-Xlinker +)" "" MPI_LINK_FLAGS_RAW "${MPI_LINK_FLAGS}")
# Now we can parse the leftover output. Note that spaces can now be handled since the above example would reduce to
# -L /my/path/to/lib and can be extracted correctly.
string(REGEX MATCHALL "^(${CMAKE_LIBRARY_PATH_FLAG},? *|--library-path=)([^\" ]+|\"[^\"]+\")"
MPI_INDIRECT_LINK_PATHS "${MPI_LINK_FLAGS_RAW}")
foreach(_MPI_LPATH IN LISTS MPI_INDIRECT_LINK_PATHS)
string(REGEX REPLACE "^(${CMAKE_LIBRARY_PATH_FLAG},? *|--library-path=)" "" _MPI_LPATH "${_MPI_LPATH}")
list(APPEND MPI_ALL_LINK_PATHS "${_MPI_LPATH}")
endforeach()
# We need to remove the flags we extracted from the linker flag list now.
string(REGEX REPLACE "(^| )(-Wl,|-Xlinker +)(${CMAKE_LIBRARY_PATH_FLAG},? *(-Wl,|-Xlinker +)?|--library-path=)([^\" ]+|\"[^\"]+\")" ""
MPI_LINK_CMDLINE_FILTERED "${MPI_LINK_CMDLINE}")
# Some MPI implementations pass on options they themselves were built with. Since -z,noexecstack is a common
# hardening, we should strip it. In general, the -z options should be undesirable.
string(REGEX REPLACE "(^| )-Wl,-z(,[^ ]+| +-Wl,[^ ]+)" "" MPI_LINK_CMDLINE_FILTERED "${MPI_LINK_CMDLINE_FILTERED}")
string(REGEX REPLACE "(^| )-Xlinker +-z +-Xlinker +[^ ]+" "" MPI_LINK_CMDLINE_FILTERED "${MPI_LINK_CMDLINE_FILTERED}")
# We only consider options of the form -Wl or -Xlinker:
string(REGEX MATCHALL "(^| )(-Wl,|-Xlinker +)([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${MPI_LINK_CMDLINE_FILTERED}")
# As a next step, we assemble the linker flags extracted in a preliminary flags string
foreach(_MPI_LINK_FLAG IN LISTS MPI_ALL_LINK_FLAGS)
string(STRIP "${_MPI_LINK_FLAG}" _MPI_LINK_FLAG)
if (MPI_LINK_FLAGS_WORK)
string(APPEND MPI_LINK_FLAGS_WORK " ${_MPI_LINK_FLAG}")
else()
set(MPI_LINK_FLAGS_WORK "${_MPI_LINK_FLAG}")
endif()
endforeach()
else()
# In the filtered case, we obtain the link time flags by just stripping the library paths.
string(REGEX REPLACE "(^| )${CMAKE_LIBRARY_PATH_FLAG} *([^\" ]+|\"[^\"]+\")" "" MPI_LINK_CMDLINE_FILTERED "${MPI_LINK_CMDLINE}")
endif()
# If we failed to extract any linker paths, we'll try using the -showme:libdirs option with the MPI compiler.
# This will return a list of folders, not a set of flags!
if (NOT MPI_ALL_LINK_PATHS)
_MPI_check_compiler(${LANG} "-showme:libdirs" MPI_LIBDIRS_CMDLINE MPI_LIBDIRS_COMPILER_RETURN)
if(MPI_LIBDIRS_COMPILER_RETURN)
separate_arguments(MPI_ALL_LINK_PATHS NATIVE_COMMAND "${MPI_LIBDIRS_CMDLINE}")
endif()
endif()
# We need to remove potential quotes and convert the paths to CMake syntax while resolving them, too.
foreach(_MPI_LPATH IN LISTS MPI_ALL_LINK_PATHS)
string(REPLACE "\"" "" _MPI_LPATH "${_MPI_LPATH}")
get_filename_component(_MPI_LPATH "${_MPI_LPATH}" REALPATH)
list(APPEND MPI_LINK_DIRECTORIES_WORK "${_MPI_LPATH}")
endforeach()
# Extract the set of libraries to link against from the link command line
# This only makes sense if CMAKE_LINK_LIBRARY_FLAG is defined, i.e. a -lxxxx syntax is supported by the compiler.
if(CMAKE_LINK_LIBRARY_FLAG)
string(REGEX MATCHALL "(^| )${CMAKE_LINK_LIBRARY_FLAG}([^\" ]+|\"[^\"]+\")"
MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
foreach(_MPI_LIB_NAME IN LISTS MPI_LIBNAMES)
string(REGEX REPLACE "^ ?${CMAKE_LINK_LIBRARY_FLAG}" "" _MPI_LIB_NAME "${_MPI_LIB_NAME}")
string(REPLACE "\"" "" _MPI_LIB_NAME "${_MPI_LIB_NAME}")
list(APPEND MPI_LIB_NAMES_WORK "${_MPI_LIB_NAME}")
endforeach()
endif()
# Treat linker objects given by full path, for example static libraries, import libraries
# or shared libraries if there aren't any import libraries in use on the system.
# Note that we do not consider CMAKE_<TYPE>_LIBRARY_PREFIX intentionally here: The linker will for a given file
# decide how to link it based on file type, not based on a prefix like 'lib'.
set(_MPI_LIB_SUFFIX_REGEX "${CMAKE_STATIC_LIBRARY_SUFFIX}")
if(DEFINED CMAKE_IMPORT_LIBRARY_SUFFIX)
if(NOT ("${CMAKE_IMPORT_LIBRARY_SUFFIX}" STREQUAL "${CMAKE_STATIC_LIBRARY_SUFFIX}"))
string(APPEND _MPI_SUFFIX_REGEX "|${CMAKE_IMPORT_LIBRARY_SUFFIX}")
endif()
else()
string(APPEND _MPI_LIB_SUFFIX_REGEX "|${CMAKE_SHARED_LIBRARY_SUFFIX}")
endif()
set(_MPI_LIB_NAME_REGEX "(([^\" ]+(${_MPI_LIB_SUFFIX_REGEX}))|(\"[^\"]+(${_MPI_LIB_SUFFIX_REGEX})\"))( +|$)")
string(REPLACE "." "\\." _MPI_LIB_NAME_REGEX "${_MPI_LIB_NAME_REGEX}")
string(REGEX MATCHALL "${_MPI_LIB_NAME_REGEX}" MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
foreach(_MPI_LIB_NAME IN LISTS MPI_LIBNAMES)
string(REGEX REPLACE "^ +\"?|\"? +$" "" _MPI_LIB_NAME "${_MPI_LIB_NAME}")
get_filename_component(_MPI_LIB_PATH "${_MPI_LIB_NAME}" DIRECTORY)
if(NOT "${_MPI_LIB_PATH}" STREQUAL "")
list(APPEND MPI_LIB_FULLPATHS_WORK "${_MPI_LIB_NAME}")
else()
list(APPEND MPI_LIB_NAMES_WORK "${_MPI_LIB_NAME}")
endif()
endforeach()
# Save the explicitly given link directories
set(MPI_LINK_DIRECTORIES_LEFTOVER "${MPI_LINK_DIRECTORIES_WORK}")
# An MPI compiler wrapper could have its MPI libraries in the implictly
# linked directories of the compiler itself.
if(DEFINED CMAKE_${LANG}_IMPLICIT_LINK_DIRECTORIES)
list(APPEND MPI_LINK_DIRECTORIES_WORK "${CMAKE_${LANG}_IMPLICIT_LINK_DIRECTORIES}")
endif()
# Determine full path names for all of the libraries that one needs
# to link against in an MPI program
unset(MPI_PLAIN_LIB_NAMES_WORK)
foreach(_MPI_LIB_NAME IN LISTS MPI_LIB_NAMES_WORK)
get_filename_component(_MPI_PLAIN_LIB_NAME "${_MPI_LIB_NAME}" NAME_WE)
list(APPEND MPI_PLAIN_LIB_NAMES_WORK "${_MPI_PLAIN_LIB_NAME}")
find_library(MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY
NAMES "${_MPI_LIB_NAME}" "lib${_MPI_LIB_NAME}"
HINTS ${MPI_LINK_DIRECTORIES_WORK}
DOC "Location of the ${_MPI_PLAIN_LIB_NAME} library for MPI"
)
mark_as_advanced(MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY)
# Remove the directory from the remainder list.
if(MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY)
get_filename_component(_MPI_TAKEN_DIRECTORY "${MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY}" DIRECTORY)
list(REMOVE_ITEM MPI_LINK_DIRECTORIES_LEFTOVER "${_MPI_TAKEN_DIRECTORY}")
endif()
endforeach()
# Add the link directories given explicitly that we haven't used back as linker directories.
foreach(_MPI_LINK_DIRECTORY IN LISTS MPI_LINK_DIRECTORIES_LEFTOVER)
file(TO_NATIVE_PATH "${_MPI_LINK_DIRECTORY}" _MPI_LINK_DIRECTORY_ACTUAL)
string(FIND "${_MPI_LINK_DIRECTORY_ACTUAL}" " " _MPI_LINK_DIRECTORY_CONTAINS_SPACE)
if(NOT _MPI_LINK_DIRECTORY_CONTAINS_SPACE EQUAL -1)
set(_MPI_LINK_DIRECTORY_ACTUAL "\"${_MPI_LINK_DIRECTORY_ACTUAL}\"")
endif()
if(MPI_LINK_FLAGS_WORK)
string(APPEND MPI_LINK_FLAGS_WORK " ${CMAKE_LIBRARY_PATH_FLAG}${_MPI_LINK_DIRECTORY_ACTUAL}")
else()
set(MPI_LINK_FLAGS_WORK "${CMAKE_LIBRARY_PATH_FLAG}${_MPI_LINK_DIRECTORY_ACTUAL}")
endif()
endforeach()
# Deal with the libraries given with full path next
unset(MPI_DIRECT_LIB_NAMES_WORK)
foreach(_MPI_LIB_FULLPATH IN LISTS MPI_LIB_FULLPATHS_WORK)
get_filename_component(_MPI_PLAIN_LIB_NAME "${_MPI_LIB_FULLPATH}" NAME_WE)
list(APPEND MPI_DIRECT_LIB_NAMES_WORK "${_MPI_PLAIN_LIB_NAME}")
set(MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY "${_MPI_LIB_FULLPATH}" CACHE FILEPATH "Location of the ${_MPI_PLAIN_LIB_NAME} library for MPI")
mark_as_advanced(MPI_${_MPI_PLAIN_LIB_NAME}_LIBRARY)
endforeach()
# Directly linked objects should be linked first in case some generic linker flags are needed for them.
if(MPI_DIRECT_LIB_NAMES_WORK)
set(MPI_PLAIN_LIB_NAMES_WORK "${MPI_DIRECT_LIB_NAMES_WORK};${MPI_PLAIN_LIB_NAMES_WORK}")
endif()
# MPI might require pthread to work. The above mechanism wouldn't detect it, but we need to
# link it in that case. -lpthread is covered by the normal library treatment on the other hand.
if("${MPI_COMPILE_CMDLINE}" MATCHES "-pthread")
list(APPEND MPI_COMPILE_OPTIONS_WORK "-pthread")
if(MPI_LINK_FLAGS_WORK)
string(APPEND MPI_LINK_FLAGS_WORK " -pthread")
else()
set(MPI_LINK_FLAGS_WORK "-pthread")
endif()
endif()
if(MPI_${LANG}_EXTRA_COMPILE_DEFINITIONS)
list(APPEND MPI_COMPILE_DEFINITIONS_WORK "${MPI_${LANG}_EXTRA_COMPILE_DEFINITIONS}")
endif()
if(MPI_${LANG}_EXTRA_COMPILE_OPTIONS)
list(APPEND MPI_COMPILE_OPTIONS_WORK "${MPI_${LANG}_EXTRA_COMPILE_OPTIONS}")
endif()
if(MPI_${LANG}_EXTRA_LIB_NAMES)
list(APPEND MPI_PLAIN_LIB_NAMES_WORK "${MPI_${LANG}_EXTRA_LIB_NAMES}")
endif()
# If we found MPI, set up all of the appropriate cache entries
if(NOT MPI_${LANG}_COMPILE_OPTIONS)
set(MPI_${LANG}_COMPILE_OPTIONS ${MPI_COMPILE_OPTIONS_WORK} CACHE STRING "MPI ${LANG} compilation options" FORCE)
endif()
if(NOT MPI_${LANG}_COMPILE_DEFINITIONS)
set(MPI_${LANG}_COMPILE_DEFINITIONS ${MPI_COMPILE_DEFINITIONS_WORK} CACHE STRING "MPI ${LANG} compilation definitions" FORCE)
endif()
if(NOT MPI_${LANG}_ADDITIONAL_INCLUDE_DIRS)
set(MPI_${LANG}_ADDITIONAL_INCLUDE_DIRS ${MPI_INCLUDE_DIRS_WORK} CACHE STRING "MPI ${LANG} additional include directories" FORCE)
endif()
if(NOT MPI_${LANG}_LINK_FLAGS)
set(MPI_${LANG}_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI ${LANG} linker flags" FORCE)
endif()
if(NOT MPI_${LANG}_LIB_NAMES)
set(MPI_${LANG}_LIB_NAMES ${MPI_PLAIN_LIB_NAMES_WORK} CACHE STRING "MPI ${LANG} libraries to link against" FORCE)
endif()
set(MPI_${LANG}_WRAPPER_FOUND TRUE PARENT_SCOPE)
endfunction()
function(_MPI_guess_settings LANG)
set(MPI_GUESS_FOUND FALSE)
# Currently only MSMPI and MPICH2 on Windows are supported, so we can skip this search if we're not targeting that.
if(WIN32)
# MSMPI
# The environment variables MSMPI_INC and MSMPILIB32/64 are the only ways of locating the MSMPI_SDK,
# which is installed separately from the runtime. Thus it's possible to have mpiexec but not MPI headers
# or import libraries and vice versa.
if(NOT MPI_GUESS_LIBRARY_NAME OR "${MPI_GUESS_LIBRARY_NAME}" STREQUAL "MSMPI")
# We first attempt to locate the msmpi.lib. Should be find it, we'll assume that the MPI present is indeed
# Microsoft MPI.
if("${CMAKE_SIZEOF_VOID_P}" EQUAL 8)
set(MPI_MSMPI_LIB_PATH "$ENV{MSMPI_LIB64}")
set(MPI_MSMPI_INC_PATH_EXTRA "$ENV{MSMPI_INC}/x64")
else()
set(MPI_MSMPI_LIB_PATH "$ENV{MSMPI_LIB32}")
set(MPI_MSMPI_INC_PATH_EXTRA "$ENV{MSMPI_INC}/x86")
endif()
find_library(MPI_msmpi_LIBRARY
NAMES msmpi
HINTS ${MPI_MSMPI_LIB_PATH}
DOC "Location of the msmpi library for Microsoft MPI")
mark_as_advanced(MPI_msmpi_LIBRARY)
if(MPI_msmpi_LIBRARY)
# Next, we attempt to locate the MPI header. Note that for Fortran we know that mpif.h is a way
# MSMPI can be used and therefore that header has to be present.
if(NOT MPI_${LANG}_ADDITIONAL_INCLUDE_DIRS)
get_filename_component(MPI_MSMPI_INC_DIR "$ENV{MSMPI_INC}" REALPATH)
set(MPI_${LANG}_ADDITIONAL_INCLUDE_DIRS "${MPI_MSMPI_INC_DIR}" CACHE STRING "MPI ${LANG} additional include directories" FORCE)
unset(MPI_MSMPI_INC_DIR)
endif()
# For MSMPI, one can compile the MPI module by building the mpi.f90 shipped with the MSMPI SDK,
# thus it might be present or provided by the user. Figuring out which is supported is done later on.
# The PGI Fortran compiler for instance ships a prebuilt set of modules in its own include folder.
# Should a user be employing PGI or have built its own set and provided it via cache variables, the
# splitting routine would have located the module files.
# For C and C++, we're done here (MSMPI does not ship the MPI-2 C++ bindings) - however, for Fortran
# we need some extra library to glue Fortran support together:
# MSMPI ships 2-4 Fortran libraries, each for different Fortran compiler behaviors. The library names
# ending with a c are using the cdecl calling convention, whereas those ending with an s are for Fortran
# implementations using stdcall. Therefore, the 64-bit MSMPI only ships those ending in 'c', whereas the 32-bit
# has both variants available.
# The second difference is the last but one letter, if it's an e(nd), the length of a string argument is
# passed by the Fortran compiler after all other arguments on the parameter list, if it's an m(ixed),
# it's passed immediately after the string address.
# To summarize:
# - msmpifec: CHARACTER length passed after the parameter list and using cdecl calling convention
# - msmpifmc: CHARACTER length passed directly after string address and using cdecl calling convention
# - msmpifes: CHARACTER length passed after the parameter list and using stdcall calling convention
# - msmpifms: CHARACTER length passed directly after string address and using stdcall calling convention
# 32-bit MSMPI ships all four libraries, 64-bit MSMPI ships only the first two.
# As is, Intel Fortran and PGI Fortran both use the 'ec' variant of the calling convention, whereas
# the old Compaq Visual Fortran compiler defaulted to the 'ms' version. It's possible to make Intel Fortran
# use the CVF calling convention using /iface:cvf, but we assume - and this is also assumed in FortranCInterface -
# this isn't the case. It's also possible to make CVF use the 'ec' variant, using /iface=(cref,nomixed_str_len_arg).
# Our strategy is now to locate all libraries, but enter msmpifec into the LIB_NAMES array.
# Should this not be adequate it's a straightforward way for a user to change the LIB_NAMES array and
# have his library found. Still, this should not be necessary outside of exceptional cases, as reasoned.
if ("${LANG}" STREQUAL "Fortran")
set(MPI_MSMPI_CALLINGCONVS c)
if("${CMAKE_SIZEOF_VOID_P}" EQUAL 4)
list(APPEND MPI_MSMPI_CALLINGCONVS s)
endif()
foreach(mpistrlenpos IN ITEMS e m)
foreach(mpicallingconv IN LISTS MPI_MSMPI_CALLINGCONVS)
find_library(MPI_msmpif${mpistrlenpos}${mpicallingconv}_LIBRARY
NAMES msmpif${mpistrlenpos}${mpicallingconv}
HINTS "${MPI_MSMPI_LIB_PATH}"
DOC "Location of the msmpi${mpistrlenpos}${mpicallingconv} library for Microsoft MPI")
mark_as_advanced(MPI_msmpif${mpistrlenpos}${mpicallingconv}_LIBRARY)
endforeach()
endforeach()
if(NOT MPI_${LANG}_LIB_NAMES)
set(MPI_${LANG}_LIB_NAMES "msmpi;msmpifec" CACHE STRING "MPI ${LANG} libraries to link against" FORCE)
endif()
# At this point we're *not* done. MSMPI requires an additional include file for Fortran giving the value
# of MPI_AINT. This file is called mpifptr.h located in the x64 and x86 subfolders, respectively.
find_path(MPI_mpifptr_INCLUDE_DIR
NAMES "mpifptr.h"
HINTS "${MPI_MSMPI_INC_PATH_EXTRA}"
DOC "Location of the mpifptr.h extra header for Microsoft MPI")
if(NOT MPI_${LANG}_ADDITIONAL_INCLUDE_VARS)
set(MPI_${LANG}_ADDITIONAL_INCLUDE_VARS "mpifptr" CACHE STRING "MPI ${LANG} additional include directory variables, given in the form MPI_<name>_INCLUDE_DIR." FORCE)
endif()
mark_as_advanced(MPI_${LANG}_ADDITIONAL_INCLUDE_VARS MPI_mpifptr_INCLUDE_DIR)
else()
if(NOT MPI_${LANG}_LIB_NAMES)
set(MPI_${LANG}_LIB_NAMES "msmpi" CACHE STRING "MPI ${LANG} libraries to link against" FORCE)
endif()
endif()
mark_as_advanced(MPI_${LANG}_LIB_NAMES)
set(MPI_GUESS_FOUND TRUE)
if(_MPIEXEC_NOT_GIVEN)
unset(MPIEXEC_EXECUTABLE CACHE)
endif()
find_program(MPIEXEC_EXECUTABLE
NAMES mpiexec
HINTS $ENV{MSMPI_BIN} "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MPI;InstallRoot]/Bin"
DOC "Executable for running MPI programs.")
endif()
endif()
# At this point there's not many MPIs that we could still consider.
# OpenMPI 1.6.x and below supported Windows, but these ship compiler wrappers that still work.
# The only other relevant MPI implementation without a wrapper is MPICH2, which had Windows support in 1.4.1p1 and older.
if(NOT MPI_GUESS_FOUND AND (NOT MPI_GUESS_LIBRARY_NAME OR "${MPI_GUESS_LIBRARY_NAME}" STREQUAL "MPICH2"))
set(MPI_MPICH_PREFIX_PATHS
"$ENV{ProgramW6432}/MPICH2/lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH\\SMPD;binary]/../lib"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH2;Path]/lib"
)
# All of C, C++ and Fortran will need mpi.lib, so we'll look for this first
find_library(MPI_mpi_LIBRARY
NAMES mpi
HINTS ${MPI_MPICH_PREFIX_PATHS})
mark_as_advanced(MPI_mpi_LIBRARY)
# If we found mpi.lib, we detect the rest of MPICH2
if(MPI_mpi_LIBRARY)
set(MPI_MPICH_LIB_NAMES "mpi")
# If MPI-2 C++ bindings are requested, we need to locate cxx.lib as well.
# Otherwise, MPICH_SKIP_MPICXX will be defined and these bindings aren't needed.
if("${LANG}" STREQUAL "CXX" AND NOT MPI_CXX_SKIP_MPICXX)
find_library(MPI_cxx_LIBRARY
NAMES cxx
HINTS ${MPI_MPICH_PREFIX_PATHS})
mark_as_advanced(MPI_cxx_LIBRARY)
list(APPEND MPI_MPICH_LIB_NAMES "cxx")
# For Fortran, MPICH2 provides three different libraries:
# fmpich2.lib which uses uppercase symbols and cdecl,
# fmpich2s.lib which uses uppercase symbols and stdcall (32-bit only),
# fmpich2g.lib which uses lowercase symbols with double underscores and cdecl.
# fmpich2s.lib would be useful for Compaq Visual Fortran, fmpich2g.lib has to be used with GNU g77 and is also
# provided in the form of an .a archive for MinGW and Cygwin. From our perspective, fmpich2.lib is the only one
# we need to try, and if it doesn't work with the given Fortran compiler we'd find out later on during validation
elseif("${LANG}" STREQUAL "Fortran")
find_library(MPI_fmpich2_LIBRARY
NAMES fmpich2
HINTS ${MPI_MPICH_PREFIX_PATHS})
find_library(MPI_fmpich2s_LIBRARY
NAMES fmpich2s
HINTS ${MPI_MPICH_PREFIX_PATHS})
find_library(MPI_fmpich2g_LIBRARY
NAMES fmpich2g
HINTS ${MPI_MPICH_PREFIX_PATHS})
mark_as_advanced(MPI_fmpich2_LIBRARY MPI_fmpich2s_LIBRARY MPI_fmpich2g_LIBRARY)
list(APPEND MPI_MPICH_LIB_NAMES "fmpich2")
endif()
if(NOT MPI_${LANG}_LIB_NAMES)
set(MPI_${LANG}_LIB_NAMES "${MPI_MPICH_LIB_NAMES}" CACHE STRING "MPI ${LANG} libraries to link against" FORCE)
endif()