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config/cmake: find MPI if the MPI component is requested #1479

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f57b4b3
config/cmake: also set `Conduit_FOUND`
mathstuf Nov 20, 2025
2aa4096
config/cmake: handle components when finding Conduit
mathstuf Nov 20, 2025
44c4f0c
config/cmake: find MPI if the MPI component is requested
mathstuf Nov 20, 2025
250069b
examples/mpi: use the MPI component
mathstuf Nov 20, 2025
1654911
config/cmake: always search for Conduit
mathstuf Nov 20, 2025
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104 changes: 66 additions & 38 deletions src/config/ConduitConfig.cmake.in
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Original file line number Diff line number Diff line change
Expand Up @@ -16,50 +16,78 @@ cmake_minimum_required(VERSION 3.8 FATAL_ERROR)

@PACKAGE_INIT@

if(NOT CONDUIT_FOUND)
# Compute the installation prefix relative to this file.
get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
if(_IMPORT_PREFIX STREQUAL "/")
set(_IMPORT_PREFIX "")
endif()

# Compute the installation prefix relative to this file.
get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
if(_IMPORT_PREFIX STREQUAL "/")
set(_IMPORT_PREFIX "")
endif()
set(CONDUIT_VERSION "@PROJECT_VERSION@")
# keep CONDUIT_USE_CXX11 to support old install logic
set(CONDUIT_USE_CXX11 "@CONDUIT_USE_CXX11@")
set(CONDUIT_USE_CXX14 "@CONDUIT_USE_CXX14@")
set(CONDUIT_USE_FMT "@CONDUIT_USE_FMT@")
set(CONDUIT_USE_CALIPER "@CONDUIT_USE_CALIPER@")
set(CONDUIT_USE_MPI "@ENABLE_MPI@")
set(CONDUIT_USE_OPENMP "@ENABLE_OPENMP@")
set(CONDUIT_INSTALL_PREFIX "@CONDUIT_INSTALL_PREFIX@")
set(CONDUIT_ZLIB_DIR "@ZLIB_DIR@")
set(CONDUIT_HDF5_DIR "@HDF5_DIR@")
set(CONDUIT_ADIOS_DIR "@ADIOS_DIR@")
set(CONDUIT_SILO_DIR "@SILO_DIR@")
set(CONDUIT_METIS_DIR "@METIS_DIR@")
set(CONDUIT_PARMETIS_DIR "@PARMETIS_DIR@")
set(CONDUIT_ADIAK_DIR "@ADIAK_DIR@")
set(CONDUIT_CALIPER_DIR "@CALIPER_DIR@")
set(CONDUIT_PYTHON_ENABLED "@PYTHON_FOUND@")
set(CONDUIT_PYTHON_EXECUTABLE "@PYTHON_EXECUTABLE@")
set(CONDUIT_PYTHON_MODULE_DIR "@CONDUIT_INSTALL_PYTHON_MODULE_DIR@")
set(CONDUIT_PYTHON_MODULE_CUSTOM_PREFIX "@CONDUIT_INSTALL_PYTHON_MODULE_CUSTOM_PREFIX@")
set(CONDUIT_USE_CMAKE_MPI_TARGETS "@CONDUIT_USE_CMAKE_MPI_TARGETS@")

set(CONDUIT_VERSION "@PROJECT_VERSION@")
# keep CONDUIT_USE_CXX11 to support old install logic
set(CONDUIT_USE_CXX11 "@CONDUIT_USE_CXX11@")
set(CONDUIT_USE_CXX14 "@CONDUIT_USE_CXX14@")
set(CONDUIT_USE_FMT "@CONDUIT_USE_FMT@")
set(CONDUIT_USE_CALIPER "@CONDUIT_USE_CALIPER@")
set(CONDUIT_USE_OPENMP "@ENABLE_OPENMP@")
set(CONDUIT_INSTALL_PREFIX "@CONDUIT_INSTALL_PREFIX@")
set(CONDUIT_ZLIB_DIR "@ZLIB_DIR@")
set(CONDUIT_HDF5_DIR "@HDF5_DIR@")
set(CONDUIT_ADIOS_DIR "@ADIOS_DIR@")
set(CONDUIT_SILO_DIR "@SILO_DIR@")
set(CONDUIT_METIS_DIR "@METIS_DIR@")
set(CONDUIT_PARMETIS_DIR "@PARMETIS_DIR@")
set(CONDUIT_ADIAK_DIR "@ADIAK_DIR@")
set(CONDUIT_CALIPER_DIR "@CALIPER_DIR@")
set(CONDUIT_PYTHON_ENABLED "@PYTHON_FOUND@")
set(CONDUIT_PYTHON_EXECUTABLE "@PYTHON_EXECUTABLE@")
set(CONDUIT_PYTHON_MODULE_DIR "@CONDUIT_INSTALL_PYTHON_MODULE_DIR@")
set(CONDUIT_PYTHON_MODULE_CUSTOM_PREFIX "@CONDUIT_INSTALL_PYTHON_MODULE_CUSTOM_PREFIX@")
set(CONDUIT_USE_CMAKE_MPI_TARGETS "@CONDUIT_USE_CMAKE_MPI_TARGETS@")
get_filename_component(CONDUIT_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)

get_filename_component(CONDUIT_CMAKE_CONFIG_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
# setup dependent pkgs
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit_setup_deps.cmake)

# setup dependent pkgs
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit_setup_deps.cmake)
# include targets exported by cmake
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit.cmake)

# include targets exported by cmake
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit.cmake)
# finally setup our final imported targets
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit_setup_targets.cmake)

# finally setup our final imported targets
include(${CONDUIT_CMAKE_CONFIG_DIR}/conduit_setup_targets.cmake)
set(Conduit_FOUND TRUE)

set(CONDUIT_FOUND TRUE)
set(_conduit_known_components
MPI)
foreach(_conduit_component IN LISTS Conduit_FIND_COMPONENTS)
if (NOT _conduit_component IN_LIST _conduit_known_components)
set("Conduit_${_conduit_component}_FOUND" 0)
set("Conduit_${_conduit_component}_NOT_FOUND_MESSAGE"
"Unknown component ${_conduit_component}")

endif()
if(Conduit_FIND_REQUIRED_${_conduit_component})
set(Conduit_FOUND 0)
list(APPEND Conduit_NOT_FOUND_MESSAGE
"Unknown component ${_conduit_component}")
endif()
else()
if(NOT DEFINED Conduit_${_conduit_component}_FOUND)
set("Conduit_${_conduit_component}_FOUND" 0)
set("Conduit_${_conduit_component}_NOT_FOUND_MESSAGE"
"Component ${_conduit_component} was not found (unimplemented?)")
endif()
if(NOT Conduit_${_conduit_component}_FOUND AND
Conduit_FIND_REQUIRED_${_conduit_component})
set(Conduit_FOUND 0)
list(APPEND Conduit_NOT_FOUND_MESSAGE
"Component ${_conduit_component} was not found: ${Conduit_${_conduit_component}_NOT_FOUND_MESSAGE}")
endif()
endif()
endforeach()
unset(_conduit_known_components)
unset(_conduit_component)

set(CONDUIT_FOUND "${Conduit_FOUND}")
33 changes: 33 additions & 0 deletions src/config/conduit_setup_deps.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,39 @@ if(CONDUIT_USE_OPENMP)
endif()
endif()

###############################################################################
# Setup MPI
###############################################################################
if("MPI" IN_LIST Conduit_FIND_COMPONENTS)
set(Conduit_MPI_NOT_FOUND_MESSAGE "")

if(NOT CONDUIT_USE_CMAKE_MPI_TARGETS)
# The compiler is expected to have MPI implicitly available; MPI is
# found.
elseif(CONDUIT_USE_MPI)
if(NOT TARGET MPI::MPI_C)
set(_conduit_find_mpi_args "")
if(Conduit_FIND_QUIETLY)
list(APPEND _conduit_find_mpi_args QUIET)
endif()

find_dependency(MPI ${_conduit_find_mpi_args} COMPONENTS C)
unset(_conduit_find_mpi_args)
endif()

if(NOT TARGET MPI::MPI_C)
set(Conduit_MPI_NOT_FOUND_MESSAGE "MPI could not be found: ${MPI_NOT_FOUND_MESSAGE}")
endif()
else()
set(Conduit_MPI_NOT_FOUND_MESSAGE "MPI support is not available")
endif()

set(Conduit_MPI_FOUND 1)
if(Conduit_MPI_NOT_FOUND_MESSAGE)
set(Conduit_MPI_FOUND 0)
endif()
endif()

###############################################################################
# Setup Caliper
###############################################################################
Expand Down
14 changes: 6 additions & 8 deletions src/examples/using-with-cmake-mpi/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -58,15 +58,14 @@ endif()
#
find_package(Conduit REQUIRED
NO_DEFAULT_PATH
PATHS ${CONDUIT_DIR}/lib/cmake/conduit)
PATHS ${CONDUIT_DIR}/lib/cmake/conduit
OPTIONAL_COMPONENTS MPI)

# make sure we have mpi, since we are going to use
# conduits mpi features
if(NOT MPI_FOUND)
find_package(MPI COMPONENTS C)
if(NOT Conduit_MPI_FOUND)
message(STATUS "This example requires an MPI-enabled Conduit")
return()
endif()


################################################################
# Option 2: import conduit using find_package search
################################################################
Expand All @@ -91,8 +90,7 @@ add_executable(conduit_mpi_example conduit_mpi_example.cpp)

# link to conduit targets
target_link_libraries(conduit_mpi_example conduit::conduit
conduit::conduit_mpi
MPI::MPI_C)
conduit::conduit_mpi)

# if you are using conduit's python CAPI capsule interface
# target_link_libraries(conduit_mpi_example conduit::conduit_python)
Expand Down