Xcode 4中的boost :: asio :: ssl链接错误

Question

我在Xcode中有一个简单的项目 - 它实际上没有做任何事情,只包括boost::asio::ssl:

// main.cpp

#include <iostream>
#include <string>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>

using namespace std ;

int main (int argc, const char * argv [] ) {
    return 0 ;
}

我把它链接到libssl.dylib和libboost_system.dylib,并在构建时得到这个:

Undefined symbols for architecture x86_64:
  "_CONF_modules_unload", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_CRYPTO_cleanup_all_ex_data", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_CRYPTO_num_locks", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::do_init() in main.o
  "_CRYPTO_set_id_callback", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::do_init() in main.o
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_CRYPTO_set_locking_callback", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::do_init() in main.o
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_ENGINE_cleanup", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_ERR_free_strings", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_ERR_reason_error_string", referenced from:
      boost::asio::error::detail::ssl_category::message(int) const in main.o
  "_ERR_remove_state", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_EVP_cleanup", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::~do_init() in main.o
  "_OPENSSL_add_all_algorithms_noconf", referenced from:
      boost::asio::ssl::detail::openssl_init_base::do_init::do_init() in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

还有其他一些我遗失的图书馆还是其他我忽略的图书馆？

Answer 1

我认为你也需要链接libcrypto -lcrypto