From d4d5de473425db32d2e96e76472475ce537c1e63 Mon Sep 17 00:00:00 2001
From: Mikhail Kolyadin <SilverTrouse@yandex.ru>
Date: Wed, 22 Jul 2026 02:18:13 +0300
Subject: [PATCH 1/2] Added a CMake target for C++20 modules, to allow adding
 argparse.cppm to projects using CMake. This follows the approach used by
 tomlplusplus and nlohmann/json

---
 module/CMakeLists.txt | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 module/CMakeLists.txt

diff --git a/module/CMakeLists.txt b/module/CMakeLists.txt
new file mode 100644
index 00000000..7e6014bc
--- /dev/null
+++ b/module/CMakeLists.txt
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.28)
+
+add_library(argparse_modules)
+
+add_library(argparse::modules ALIAS argparse_modules)
+
+target_sources(
+  argparse_modules PUBLIC FILE_SET CXX_MODULES FILES
+                          argparse.cppm)
+
+target_link_libraries(argparse_modules PRIVATE argparse::argparse)
+
+if(ARGPARSE_MODULE_USE_STD_MODULE)
+  target_compile_definitions(argparse_modules
+                             PRIVATE -DARGPARSE_MODULE_USE_STD_MODULE=1)
+  
+  target_compile_features(argparse_modules PUBLIC cxx_std_23)
+else()
+  target_compile_features(argparse_modules PUBLIC cxx_std_20)
+endif()

From 55f8c677d3569fb94f0c5ce4fa0a9edbd9e2cb2e Mon Sep 17 00:00:00 2001
From: Mikhail Kolyadin <SilverTrouse@yandex.ru>
Date: Wed, 22 Jul 2026 02:18:36 +0300
Subject: [PATCH 2/2] Added a CMake target for C++20 modules, to allow adding
 argparse.cppm to projects using CMake. This follows the approach used by
 tomlplusplus and nlohmann/json

---
 CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ddb4bc6f..ccd9ae23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,8 @@ project(argparse
 option(ARGPARSE_INSTALL "Include an install target" ${ARGPARSE_IS_TOP_LEVEL})
 option(ARGPARSE_BUILD_TESTS "Build tests" ${ARGPARSE_IS_TOP_LEVEL})
 option(ARGPARSE_BUILD_SAMPLES "Build samples" OFF)
+option(ARGPARSE_BUILD_MODULES "Build C++ modules support" OFF)
+option(ARGPARSE_MODULE_USE_STD_MODULE "Build with modules C++ import std" OFF)
 
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
@@ -28,6 +30,10 @@ target_include_directories(argparse INTERFACE
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
   $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>)
 
+if(ARGPARSE_BUILD_MODULES)
+  add_subdirectory(module)
+endif()
+
 if(ARGPARSE_BUILD_SAMPLES)
   add_subdirectory(samples)
 endif()