Re: [Boost-users] Compiling boost asio 1.50.0 under Xcode 4.3.3 with Clang or GCC and c++11 support

Subject: Re: [Boost-users] Compiling boost asio 1.50.0 under Xcode 4.3.3 with Clang or GCC and c++11 support
From: Howard Hinnant (howard.hinnant_at_[hidden])
Date: 2012-07-03 12:05:26

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