链接/编译使用boost/filesystem.hpp的程序 [英] Linking/compiling a program that uses boost/filesystem.hpp

问题描述

我正在尝试在我编写的某些代码中使用boost/filesystem库.我似乎很难编译它.我正在运行Debian Wheezy，并且具有增强版1.49(如果使用apt-get安装，这将是该版本).我正在尝试编译文档中提供的示例

I'm trying to use the boost/filesystem library in some code that I am writing. I seem to be having a hard time getting it to compile. I'm running Debian Wheezy, and have boost version 1.49(which is what comes if you install using apt-get). I'm trying to compile an example that is available with the documentation

#include <iostream>
#include <boost/filesystem.hpp>
using namespace boost::filesystem;

int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: tut1 path\n";
    return 1;
  }
  std::cout << argv[1] << " " << file_size(argv[1]) << '\n';
  return 0;
}

我使用以下命令:

g++ temp.cc -o temp /usr/lib/libboost_filesystem.a

我遇到许多错误，例如:

I get a number of errors such as:

/usr/lib/libboost_filesystem.a(operations.o): In function `boost::filesystem3::detail::dir_itr_close(void*&, void*&)':
(.text+0x4d): undefined reference to `boost::system::system_category()'
/usr/lib/libboost_filesystem.a(operations.o): In function `boost::filesystem3::detail::directory_iterator_increment(boost::filesystem3::directory_iterator&, boost::system::error_code*)':
(.text+0xe3): undefined reference to `boost::system::system_category()'

这可能是一些链接错误，对吗?关于如何解决这个问题有什么想法吗?

This is probably some linking error right? Any ideas on how I could solve it?

更新#1 : 我尝试使用-lboost_filesyste和-L/usr/lib运行它.它给了我以下错误:

UPDATE #1: I tried running it with the -lboost_filesyste and -L /usr/lib. It gives me the following error:

/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'

推荐答案

您没有正确链接库.另外，如其他人所述，boost_filesystem也需要boost_system库.使用:

You are not linking the library properly. Also, as others mentioned, boost_filesystem needs also boost_system library. Use:

g++ temp.cc -o temp -lboost_system -lboost_filesystem

命令行参数-l foo链接libfoo.a库.如果静态库不在默认库位置，请使用命令-L /custom/library/dir.但我相信GCC会自动考虑/usr/lib.

Command line param -l foo links libfoo.a library. If the static library is not in default library location, use command -L /custom/library/dir. But I believe /usr/lib is automatically taken into consideration by GCC.

根据下面的注释，您似乎没有使用main()函数编译文件，或者您在main()名称中有错字.确保temp.cc仅包含以下功能之一:

According to your comment below it looks like you are not compiling the file with main() function, or you have a typo in main() name. Make sure that temp.cc contains one and only one of these functions:

int main();
int main(int argc, char** argv);

当然，您确实记得大小写很重要. :)

Of course you do remember that upper/lower case matters. :)

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