CMakeLists.txt

cmake_minimum_required(VERSION 3.9)

project(modules_test)

function(target_enable_modules TARGET)
    if(CMAKE_BUILD_TYPE MATCHES "^Debug$" OR NOT DEFINED CMAKE_BUILD_TYPE)
        set(_MODULES_PATH $ENV{IFCPATH}/Debug)
    else()
        set(_MODULES_PATH $ENV{IFCPATH}/Release)
    endif()
    find_library(_MODULES_LIB NAME std PATHS ${_MODULES_PATH} NO_DEFAULT_PATH)

    add_library(Modules::std UNKNOWN IMPORTED)
    if(EXISTS "${_MODULES_LIB}")
        set_target_properties(Modules::std PROPERTIES
                    IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
                    IMPORTED_LOCATION "${_MODULES_LIB}")
    endif()

    target_compile_options(${TARGET} PRIVATE /experimental:module "/module:search ${_MODULES_PATH}")
endfunction()

function(target_add_module TARGET MODULE_FILES)
    set(_module_files ${MODULE_FILES} ${ARGN})
    get_target_property(_srcs ${TARGET} SOURCES)

    foreach(_module_file ${_module_files})
        message(${_module_file})
        set_source_files_properties(${_module_file} PROPERTIES LANGUAGE CXX)
        list(INSERT _srcs 0 ${_module_file})
    endforeach()

    set_target_properties(${TARGET} PROPERTIES SOURCES "${_srcs}")
endfunction()

set(SOURCES main.cpp manager.cpp)

add_executable(${PROJECT_NAME} ${SOURCES})
target_enable_modules(${PROJECT_NAME})
target_add_module(${PROJECT_NAME} actor.ixx manager.ixx)

target_link_libraries(${PROJECT_NAME} Modules::std)
target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_17)