Cmake find_package 须要指定具体的so

须要使用cmake的find_package将boost库添加到项目中，经过cmake --help-module FindBoost 能够查看cmake引入Boost的帮助信息：

能够看到，Boot_LIBRARIES确实是boost相关的库，刚开始编写的CMakeLists.txt文件以下：

cmake_minimum_required(VERSION 2.8.4) project(boostCmake) set(CMAKE_CXX_STANDARD 11) set(Boost_DEBUG 1) find_package(Boost) if(Boost_FOUND) MESSAGE("Boost_FOUND") include_directories(${Boost_INCLUDE_DIRS}) link_directories(${Boost_LIBRARIES}) MESSAGE(WARNING "Boost_INCLUDE_DIRS is ${Boost_INCLUDE_DIRS}") add_executable(boostCmake main.cpp) MESSAGE(WARNING "Boost_LIBRARIES is ${Boost_LIBRARY_DIRS}") MESSAGE(WARNING "Boost_LIBRARIES is ${Boost_LIBRARIES}") target_link_libraries(boostCmake ${Boost_LIBRARIES} ) endif()

但是连接一直不成功，MESSAGE(WARNING "Boost_LIBRARIES is ${Boost_LIBRARIES}") 打印的值始终为空。

这是由于cmake的find_package须要制定具体的library，${Boost_LIBRARIES}才会有值，要否则就会是空，find_package的正确写法是：

find_package(Boost 1.54 REQUIRED COMPONENTS system  thread)

这样能够看到打印的结果，所须要的库都找到了，这样target_link_libraries(boostCmake ${Boost_LIBRARIES}才会真正的连接到具体的so上，否则就会一直报连接错误。

具体工程能够参考：https://github.com/aktiger/boostCmake.git