通过boost编译问题

问题描述

我在编译包含"boost/asio.hpp"的程序时遇到问题.
编译该程序(来自boost网站):

I'm having problems with compiling a program which includes "boost/asio.hpp".
Compiling this program(taken from boost site):

example.cpp:
#include <boost/lambda/lambda.hpp>
#include <iostream>
#include <iterator>
#include <algorithm>

int main()
{
    using namespace boost::lambda;
    typedef std::istream_iterator<int> in;

    std::for_each(
        in(std::cin), in(), std::cout << (_1 * 3) << " " );
}

与

c++ -I path/to/boost_1_55_0 example.cpp -o example

正常工作.但是当程序包括:

works fine.But when the program includes:

boost/asio.hpp

我正在尝试使用:

g++ -I /usr/local/boost_1_55_0 example.cpp -o example -lboost_system -lboost_thread

生成了一个可执行文件，但是在尝试执行示例"时出现此错误:

an executable is generated ,but I'm getting this error when trying to execute "example":

./example: error while loading shared libraries: libboost_system.so.1.55.0: cannot open shared object file: No such file or directory

文件"libboost_system.so.1.55.0"位于"/usr/local/lib".我也尝试用:

The file "libboost_system.so.1.55.0" is located at "/usr/local/lib".I also tried to compile the program with :

g++ -I /usr/local/boost_1_55_0 -L/usr/local/lib example.cpp -o example -lboost_system -lboost_thread

并遇到相同的错误.

我该如何解决?

推荐答案

您需要告诉链接器在哪里可以找到所需的库.我更喜欢使用RPATH:

You need to tell the linker where to find the library it needs. I prefer RPATH for this:

g++ -I /usr/local/boost_1_55_0 -Wl,-rpath=/usr/local/lib example.cpp -o example -lboost_system -lboost_thread

将/usr/local/lib烘焙到可执行文件中，以便ld稍后可以找到它.您可以在构建后运行ldd example来查看ld将加载的内容.我敢打赌，现在它说未找到"，并且在添加RPATH之后将找到该库.

That bakes /usr/local/lib into the executable so ld can find it later. You can see what ld will load by running ldd example after building. I bet right now it says "not found" and after adding RPATH it will find the library.

另一种选择是将/usr/local/lib设置为/etc/ld.so.conf中的系统搜索路径，但这要重得多.

Another option is to set /usr/local/lib as a system search path in your /etc/ld.so.conf, but that's quite a bit more heavyweight.

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