Question

Steps:
1. sudo port boost
The boost file installed in /opt/local/boost, library files are in /opt/local/lib

2. use XCode to create c++ project

#include <iostream>
#include <boost/asio.hpp>
int main () {
    return 0;
}

3. set XCode to find out boost
in “Build Settings” -> “HEADER_SEARCH_PATHS”
in both Debug and Release add path /opt/local/include

4. “Build Settings” -> “LIBRARY_SEARCH_PATHS” –> add /opt/local/lib both for debug and release.

5. build program and failed.
Error Messages,

Undefined symbols for architecture x86_64:
  "boost::system::generic_category()", referenced from:
  ___cxx_global_var_init1 in main.o
  ___cxx_global_var_init2 in main.o
  "boost::system::system_category()", referenced from:
  ___cxx_global_var_init3 in main.o
  boost::asio::error::get_system_category() in main.o
  "boost::asio::error::get_netdb_category()", referenced from:
  ___cxx_global_var_init5 in main.o <br>
  "boost::asio::error::get_addrinfo_category()", referenced from:
  ___cxx_global_var_init6 in main.o <br>
  "boost::asio::error::get_misc_category()", referenced from:
  ___cxx_global_var_init7 in main.o <br>
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Am I wrong in the procedure?

Answer 1

You need to link with Boost.System, which should be in /opt/local/lib/libboost_system (with some suffix, that depends on how you built boost)

Add that to your Xcode project.