Modules, ABI & Build Tooling

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// math.ixx
export module math;

export int add(int a, int b) { return a + b; }
int helper() { return 0; }        // not exported

// main.cpp
import math;
int main() { return add(2, 3); }

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cmake_minimum_required(VERSION 3.28)
project(app CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_executable(app main.cpp)
target_compile_options(app PRIVATE -Wall -Wextra -Wpedantic)

# debug builds with sanitizers
target_compile_options(app PRIVATE
    $<$<CONFIG:Debug>:-fsanitize=address,undefined -g>)
target_link_options(app PRIVATE
    $<$<CONFIG:Debug>:-fsanitize=address,undefined>)