cmake_minimum_required(VERSION 3.24) project(cxx_modules_library NONE) set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "aa1f7df0-828a-4fcd-9afc-2dc80491aca7") find_package(export_interfaces_no_properties REQUIRED) if (NOT TARGET CXXModules::export_interfaces_no_properties) message(FATAL_ERROR "Missing imported target") endif () get_property(file_sets TARGET CXXModules::export_interfaces_no_properties PROPERTY INTERFACE_CXX_MODULE_SETS) if (NOT file_sets STREQUAL "modules") message(FATAL_ERROR "Incorrect exported file sets in CXXModules::export_interfaces_no_properties:\n ${file_sets}") endif () get_property(file_set_files TARGET CXXModules::export_interfaces_no_properties PROPERTY CXX_MODULE_SET_modules) set(expected_file_set_files "${expected_dir}/importable.cxx" "${expected_dir}/subdir/importable.cxx" ) if (NOT file_set_files STREQUAL "${expected_file_set_files}") message(FATAL_ERROR "Incorrect exported file set paths in CXXModules::export_interfaces_no_properties:\n ${file_set_files}") endif () get_property(imported_modules_set TARGET CXXModules::export_interfaces_no_properties PROPERTY IMPORTED_CXX_MODULES_DEBUG SET) if (imported_modules_set) message(FATAL_ERROR "Unexpected C++ modules specified.") endif ()