Add CMake functionality to export/import cleanly.

CMakeLists.txt

@@ -0,0 +1,112 @@
+# Copyright (c) 2026 Narta Xaymar Dirks (info at xaymar dot com)
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+# Require the latest CMake version.
+cmake_minimum_required(VERSION 4.2.1)
+
+project(asio)
+
+# Is this the new or old layout?
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/include")
+	# New Layout
+	set(_src "${CMAKE_CURRENT_SOURCE_DIR}")
+else()
+	# Old Layout
+	set(_src "${CMAKE_CURRENT_SOURCE_DIR}/asio")
+endif()
+
+# Figure out the version from the provided version.hpp.
+if(EXISTS "${_src}/include/asio/version.hpp")
+	file(READ "${_src}/include/asio/version.hpp" ASIO_VERSION_HPP)
+	string(REGEX MATCH "#define ASIO_VERSION ([0-9]+) // ([0-9]+)\.([0-9]+)\.([0-9]+)" ASIO_VERSION "${ASIO_VERSION_HPP}")
+	set(ASIO_VERSION_INT ${CMAKE_MATCH_1})
+	set(ASIO_VERSION_MAJOR ${CMAKE_MATCH_2}) # Trust the comment for now.
+	set(ASIO_VERSION_MINOR ${CMAKE_MATCH_3})
+	set(ASIO_VERSION_PATCH ${CMAKE_MATCH_4})
+	project(${PROJECT_NAME} VERSION "${ASIO_VERSION_MAJOR}.${ASIO_VERSION_MINOR}.${ASIO_VERSION_PATCH}")
+endif()
+
+
+#--------------------------------------------------------------------------------#
+# Options
+#--------------------------------------------------------------------------------#
+
+# What options?
+
+#--------------------------------------------------------------------------------#
+# Library
+#--------------------------------------------------------------------------------#
+
+add_library(${PROJECT_NAME} INTERFACE)
+
+target_include_directories(${PROJECT_NAME}
+	INTERFACE
+		$<BUILD_INTERFACE:${_src}/include/>
+		$<INSTALL_INTERFACE:include/>
+)
+
+target_compile_definitions(${PROJECT_NAME}
+	INTERFACE
+		ASIO_STANDALONE
+)
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+	# Only necessary for source builds, which only work on MSVC anyway.
+	CXX_STANDARD 11
+	CXX_STANDARD_REQUIRED ON
+	CXX_EXTENSIONS OFF
+)
+
+#--------------------------------------------------------------------------------#
+# Install
+#--------------------------------------------------------------------------------#
+
+install(TARGETS ${PROJECT_NAME}
+	EXPORT ${PROJECT_NAME}-targets
+	LIBRARY RUNTIME FRAMEWORK
+	PERMISSIONS OWNER_WRITE GROUP_WRITE OWNER_READ GROUP_READ WORLD_READ OWNER_EXECUTE GROUP_EXECUTE WORLD_EXECUTE
+)
+install(
+	DIRECTORY "${_src}/include/"
+	TYPE INCLUDE
+	FILE_PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ GROUP_WRITE WORLD_READ
+	DIRECTORY_PERMISSIONS OWNER_WRITE GROUP_WRITE OWNER_READ GROUP_READ WORLD_READ OWNER_EXECUTE GROUP_EXECUTE WORLD_EXECUTE
+	FILES_MATCHING
+		REGEX ".*\.hpp$"
+		REGEX ".*\.ipp$"
+)
+install(
+	FILES
+		"${CMAKE_CURRENT_BINARY_DIR}/asio-config.cmake"
+		"${CMAKE_CURRENT_BINARY_DIR}/asio-config-version.cmake"
+	DESTINATION "share/cmake/asio/"
+)
+
+#--------------------------------------------------------------------------------#
+# CMake Config
+#--------------------------------------------------------------------------------#
+
+include(CMakePackageConfigHelpers)
+configure_package_config_file(
+	"cmake/config.cmake.in"
+	"${PROJECT_NAME}-config.cmake"
+	INSTALL_DESTINATION "share/cmake/asio/"
+)
+write_basic_package_version_file(
+	"${PROJECT_NAME}-config-version.cmake"
+	COMPATIBILITY SameMinorVersion
+	ARCH_INDEPENDENT
+)
+
+# Generate asio-targets.cmake and asio-targets${CMAKE_BUILD_TYPE}.cmake files.
+export(EXPORT ${PROJECT_NAME}-targets
+	FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-targets.cmake"
+	NAMESPACE ${PROJECT_NAME}::
+)
+install(EXPORT ${PROJECT_NAME}-targets
+	DESTINATION "share/cmake/asio/"
+	NAMESPACE ${PROJECT_NAME}::
+)
+

cmake/config.cmake.in

@@ -0,0 +1,8 @@
+# Copyright (c) 2026 Narta Xaymar Dirks (info at xaymar dot com)
+# 
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/asio-targets.cmake")