Add a Boost-friendly subproject case to CMakeLists

closes #2254

CHANGELOG.md

@@ -1,3 +1,4 @@
+* Add a Boost-friendly subproject case to CMakeLists.
 * Remove use of POSIX-only constant.
 
 --------------------------------------------------------------------------------

CMakeLists.txt

@@ -1,3 +1,45 @@
+if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+
+# Generated by `boostdep --cmake beast`
+# Copyright 2020, 2021 Peter Dimov
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+cmake_minimum_required(VERSION 3.8...3.20)
+
+project(boost_beast VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
+
+add_library(boost_beast INTERFACE)
+add_library(Boost::beast ALIAS boost_beast)
+
+target_include_directories(boost_beast INTERFACE include)
+
+target_link_libraries(boost_beast
+  INTERFACE
+    Boost::asio
+    Boost::assert
+    Boost::bind
+    Boost::config
+    Boost::container
+    Boost::core
+    Boost::endian
+    Boost::intrusive
+    Boost::logic
+    Boost::mp11
+    Boost::optional
+    Boost::smart_ptr
+    Boost::static_assert
+    Boost::system
+    Boost::throw_exception
+    Boost::type_traits
+    Boost::utility
+    Boost::winapi
+)
+
+target_compile_features(boost_beast INTERFACE cxx_std_11)
+
+else()
+
 #
 # Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
 #
@@ -255,3 +297,5 @@ endif()
 if (Beast_BUILD_TESTS)
     add_subdirectory (test)
 endif()
+
+endif()