Add CMake Project

Now implemented:
- standalote installation as asio package;
- export asio::standalone library;
- optional building and installation cpp11 and cpp14 examples;
- import from buildtree.

Author: podsvirov

asio/CMakeLists.txt

@@ -0,0 +1,42 @@
+# Minimum supported CMake version
+cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+
+# Project
+project(asio
+  VERSION 1.12.0
+  LANGUAGES CXX)
+
+# Options
+set(asio_BUILD_EXAMPLES OFF CACHE BOOL "Build asio examples")
+
+# Installation configuration
+include(GNUInstallDirs)
+if(NOT DEFINED CMAKE_INSTALL_CMAKEDIR)
+  set(CMAKE_INSTALL_CMAKEDIR ${CMAKE_INSTALL_LIBDIR}/cmake/asio)
+endif()
+
+# Interface library
+add_subdirectory(include)
+
+# Sources
+add_subdirectory(src)
+
+# Installation
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+  "${CMAKE_CURRENT_BINARY_DIR}/asio-config-version.cmake"
+  VERSION ${${PROJECT_NAME}_VERSION}
+  COMPATIBILITY AnyNewerVersion)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/asio-config-version.cmake
+  DESTINATION ${CMAKE_INSTALL_CMAKEDIR})
+install(EXPORT asio-targets
+  DESTINATION ${CMAKE_INSTALL_CMAKEDIR}
+  NAMESPACE asio::)
+install(FILES asio-config.cmake DESTINATION ${CMAKE_INSTALL_CMAKEDIR})
+
+# Buildtree export
+configure_file(asio-config.cmake
+  ${CMAKE_CURRENT_BINARY_DIR}/asio-config.cmake COPYONLY)
+export(EXPORT asio-targets
+  NAMESPACE asio::
+  FILE ${CMAKE_CURRENT_BINARY_DIR}/asio-targets.cmake)

asio/asio-config.cmake

@@ -0,0 +1 @@
+include(${CMAKE_CURRENT_LIST_DIR}/asio-targets.cmake)