mpi.cmake

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# Copyright (c) 2020 - 2024 David Guibert
# All rights reserved.
#
# SPDX-License-Identifier: Apache-2.0
 
set_property(GLOBAL PROPERTY mpi_can_use_system TRUE)
 
if(mpi_enabled AND NOT TARGET MPI::MPI_C)
  set(MPI_DETERMINE_LIBRARY_VERSION ON)
  if(USE_SYSTEM_mpi)
    message(STATUS "MPI: enabled (system installed)")
 
    # Looking for MPI implementation compatible with 3.1 standard
    find_package(MPI 3.1 REQUIRED)
 
    get_filename_component(MPI_DIR "${MPIEXEC_EXECUTABLE}" PATH)
    get_filename_component(MPI_DIR "${MPI_DIR}" PATH)
    get_target_property(CPATH_MPI MPI::MPI_C INTERFACE_INCLUDE_DIRECTORIES)
 
    list(JOIN CPATH_MPI ":" CPATH_MPI)
    set_if_not_present(ENV{CPATH} "$ENV{CPATH}" "${CPATH_MPI}")
 
  else()
    message(FATAL_ERROR "HPCW requires an externally-built MPI library")
  endif()
 
endif()