在ubuntu环境编译支持x86_64和aarch64平台的boost1.65.1库

1.下载boost 1.65.1版本： https://www.boost.org/users/history/version_1_65_1.html；
2.解压boost 1.65.1版本包在ubuntu系统下；
3.进入解压包路径，编写CMakeList.txt文件，文件内容（只编译filesytem包）

cmake_minimum_required (VERSION 3.12)
project(Boost)

include_directories( ${PROJECT_SOURCE_DIR})

if(APPLE)
   set(CMAKE_MACOSX_RPATH TRUE)
endif()

set(CMAKE_POSITION_INDEPENDENT_CODE ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

add_library(boost_system STATIC
   ${PROJECT_SOURCE_DIR}/libs/system/src/error_code.cpp
)

add_library(boost_filesystem STATIC
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src/codecvt_error_category.cpp
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src/operations.cpp
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src/path_traits.cpp
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src/path.cpp
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src/portability.cpp
   ${PROJECT_SOURCE_DIR}/libs/filesystem/src