On Jul 3, 2012, at 11:42 AM, Graham Reitz wrote:

(Below) Is this is known issue, am I missing something, or does the libboost_system.a library need to be compiled differently than the default directions to work with c++11 support?

The following code produces linker errors when the compiler options -std=c++11and libc++ are used:

#include <iostream>

#include <boost/asio.hpp>

int main( int argc, char* argv[] )

{

   return 0;

}

Undefined symbols for architecture x86_64:

 "std::allocator<char>::allocator()", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::allocator<char>::~allocator()", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::string::operator=(char const*)", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

 "std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:

     (anonymous namespace)::generic_error_category::message(int) const in libboost_system.a(error_code.o)

     ___tcf_0 in libboost_system.a(error_code.o)

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

This is just a guess, but it looks like you built the boost lib with -stdlib=libc++, and the above code without -stdlib=libc++.  Note that both the compile phase and the link phase needs to know about -stdlib=libc++.

Howard

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