cmake_minimum_required(VERSION 4.0)

project(test_module LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
  message(WARNING "test_module requires Clang for C++ modules; skipping")
  return()
endif()

set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)

add_executable(test_module main.cppm)
target_sources(
  test_module
  PRIVATE
  FILE_SET cxx_modules TYPE CXX_MODULES
                       BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}
                       FILES main.cppm math.cppm math2.cppm)
target_compile_features(test_module PRIVATE cxx_std_23)
target_compile_options(
  test_module
  PRIVATE
    # Re-enable implicit modules for Clang std import within this test target
    -fimplicit-modules -fimplicit-module-maps
    -Wall -Wextra -Wpedantic $<$<CONFIG:Debug>:-g -O0>
    -Wno-import-implementation-partition-unit-in-interface-unit
    $<$<CONFIG:Release>:-O3>)