-- Form B inline descriptor for Boost.Asio 1.92.0 — networking/async I/O as

-- consumed INSIDE the modular-boost header family. This is the boostorg/asio

-- tree (Boost.Asio), NOT the standalone chriskohlhoff.asio package already in

-- this index: Beast 1.92 removed BEAST_USE_STANDALONE_ASIO upstream, so the

-- beast descriptor has no choice but to ride boost.asio (see compat.boost-beast).

--

-- Header-only — the boostorg superproject builds no compiled asio target.

-- Part of the modular-boost header family; see compat.boost-config for the

-- family wiring and version-train policy. Header closure verified by grepping

-- every `<boost/...>` include across the include tree and cross-checked

-- against the repo's CMakeLists INTERFACE line:

-- asio -> align, assert, config, system, throw_exception

-- (+ context, date_time — both DISABLED, see below)

-- Boost.Align looks surprising on first read but is real: asio/detail/memory

-- routes aligned allocations through boost::align::align.

--

-- Two optional Boost libraries are compile-time auto-detected and deliberately

-- switched OFF via the package's default feature (same trick as the

-- standalone chriskohlhoff.asio's ASIO_DISABLE_BOOST_CONTEXT_FIBER):

--

-- * boost.context — spawn()/yield_context stackful coroutines. The fiber

-- detection is compiler-only (clang/gcc >= C++11 ⇒ on), so without the

-- disable define asio/impl/spawn.hpp would #include <boost/context/fiber.hpp>,

-- and Boost.Context is a COMPILED (and assembly) library — packaging it

-- would end this family's header-only property. Beast never calls spawn.

-- * boost.date_time — the legacy deadline_timer. asio/deadline_timer.hpp and

-- time_traits.hpp are guarded by BOOST_ASIO_HAS_BOOST_DATE_TIME, so with

-- the disable define even `#include <boost/asio.hpp>` never reaches

-- boost/date_time. Beast uses steady_timer (std::chrono).

--

-- With both off, the asio surface is the same one the standalone package

-- exposes minus iostream/streambuf quirks: io_context, timers, sockets,

-- buffers, co_spawn/awaitable, ssl (headers — requires an OpenSSL dep the

-- consumer must bring, e.g. compat.openssl; NOT wired here). Handlers run on

-- POSIX threads auto-detected via unistd.h macros; no ldflags needed beyond

-- what the consumer's own profile carries — see chriskohlhoff.asio for the

-- -pthread precedent if a member ever needs it pinned.

--

-- Header-only, traditional `#include` consumption; no CN mirror yet; BSL-1.0.

package = {

spec = "1",

namespace = "compat",

name = "boost-asio",

description = "Boost.Asio 1.92.0 — networking/async I/O; the boostorg tree consumed by Boost.Beast",

licenses = {"BSL-1.0"},

repo = "https://github.com/boostorg/asio",

type = "package",

xpm = {

linux = {

["1.92.0"] = {

url = "https://github.com/boostorg/asio/archive/refs/tags/boost-1.92.0.tar.gz",

sha256 = "9aff35259a81bc08cf7a4498cec06e8e35a645a54b917ae16c3e5884fd260ecb",

},

},

macosx = {

["1.92.0"] = {

url = "https://github.com/boostorg/asio/archive/refs/tags/boost-1.92.0.tar.gz",

sha256 = "9aff35259a81bc08cf7a4498cec06e8e35a645a54b917ae16c3e5884fd260ecb",

},

},

windows = {

["1.92.0"] = {

url = "https://github.com/boostorg/asio/archive/refs/tags/boost-1.92.0.tar.gz",

sha256 = "9aff35259a81bc08cf7a4498cec06e8e35a645a54b917ae16c3e5884fd260ecb",

},

},

},

mcpp = {

language = "c++20",

import_std = false,

-- Exposes `boost/asio/` (+ boost/asio.hpp) so family consumers'

-- `#include <boost/asio/buffer.hpp>` resolve.

include_dirs = { "*/include" },

-- Header-only: a trivial anchor TU gives mcpp a buildable lib target.

generated_files = {

["mcpp_generated/boost_asio_anchor.cpp"] = [==[

int mcpp_compat_boost_asio_anchor(void) { return 0; }

]==],

},

sources = { "mcpp_generated/boost_asio_anchor.cpp" },

targets = { ["boost_asio"] = { kind = "lib" } },

-- The disable defines ride the package's default feature so they reach

-- every TU that compiles an asio header — direct consumers here, and

-- compat.boost-beast consumers through its own identical default

-- feature (idempotent, same values — see that descriptor).

--

-- BOOST_ASIO_HAS_THREADS is pinned for the same reason

-- chriskohlhoff.asio pins ASIO_HAS_THREADS: the workspace's

-- llvm-on-Windows toolchain (clang → x86_64-pc-windows-msvc) defines

-- no _MT/_REENTRANT and boost::config yields no BOOST_HAS_THREADS, so

-- asio's own detection (detail/config.hpp) silently selects

-- null_thread. It also feeds BOOST_ASIO_VERSION_TAG, so it must agree

-- across every TU — hence a feature define, not a cflag.

features = {

["default"] = { implies = { "asio-config" } },

["asio-config"] = {

defines = {

"BOOST_ASIO_DISABLE_BOOST_CONTEXT_FIBER",

"BOOST_ASIO_DISABLE_BOOST_DATE_TIME",

"BOOST_ASIO_HAS_THREADS",

},

},

},

deps = {

["compat.boost-align"] = "1.92.0",

["compat.boost-assert"] = "1.92.0",

["compat.boost-config"] = "1.92.0",

["compat.boost-system"] = "1.92.0",

["compat.boost-throw-exception"] = "1.92.0",

},

},

}