cmake_minimum_required(VERSION 3.16 FATAL_ERROR)

project(omnitrace-mpi-examples LANGUAGES C CXX)

if(OMNITRACE_DISABLE_EXAMPLES)
    get_filename_component(_DIR ${CMAKE_CURRENT_LIST_DIR} NAME)

    if(${PROJECT_NAME} IN_LIST OMNITRACE_DISABLE_EXAMPLES OR ${_DIR} IN_LIST
                                                             OMNITRACE_DISABLE_EXAMPLES)
        return()
    endif()
endif()

find_package(MPI)
if(NOT MPI_FOUND)
    if("${CMAKE_PROJECT_NAME}" STREQUAL "omnitrace" AND "$ENV{OMNITRACE_CI}")
        set(_MSG_TYPE STATUS) # don't generate warnings during CI
    else()
        set(_MSG_TYPE AUTHOR_WARNING)
    endif()
    message(${_MSG_TYPE} "MPI could not be found. Cannot build omnitrace-mpi target")
    return()
endif()

find_package(Threads REQUIRED)

set(CMAKE_BUILD_TYPE "RelWithDebInfo")

add_library(mpi-c-interface-library INTERFACE)
target_link_libraries(
    mpi-c-interface-library
    INTERFACE Threads::Threads MPI::MPI_C
              $<TARGET_NAME_IF_EXISTS:omnitrace::omnitrace-compile-options>)
target_compile_options(mpi-c-interface-library INTERFACE -Wno-double-promotion)

add_executable(mpi-allgather allgather.c)
target_link_libraries(mpi-allgather PRIVATE mpi-c-interface-library)

add_executable(mpi-bcast bcast.c)
target_link_libraries(mpi-bcast PRIVATE mpi-c-interface-library)

add_executable(mpi-all2all all2all.c)
target_link_libraries(mpi-all2all PRIVATE mpi-c-interface-library)

add_executable(mpi-reduce reduce.c)
target_link_libraries(mpi-reduce PRIVATE mpi-c-interface-library)

add_executable(mpi-scatter-gather scatter-gather.c)
target_link_libraries(mpi-scatter-gather PRIVATE mpi-c-interface-library)

add_executable(mpi-send-recv send-recv.c)
target_link_libraries(mpi-send-recv PRIVATE mpi-c-interface-library)

add_executable(mpi-allreduce allreduce.c)
target_link_libraries(mpi-allreduce PRIVATE mpi-c-interface-library m)

set(CMAKE_BUILD_TYPE "Release")

add_library(mpi-cxx-interface-library INTERFACE)
target_link_libraries(
    mpi-cxx-interface-library
    INTERFACE Threads::Threads MPI::MPI_CXX
              $<TARGET_NAME_IF_EXISTS:omnitrace::omnitrace-compile-options>)

add_executable(mpi-example mpi.cpp)
target_link_libraries(mpi-example PRIVATE mpi-cxx-interface-library)

if(OMNITRACE_INSTALL_EXAMPLES)
    install(
        TARGETS mpi-example mpi-allgather mpi-bcast mpi-all2all mpi-reduce
                mpi-scatter-gather mpi-send-recv
        DESTINATION bin
        COMPONENT omnitrace-examples)
endif()