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: Graham Reitz (grahamreitz_at_[hidden])
Date: 2012-07-05 11:38:22

Thanks Howard,

The default boost build does not include c++11 support, correct? 
i.e.
> ./bootstrap --prefix=./standard_build
> ./b2 install

Is this the correct build parameters to build boost with c++11 support?
> ./bootstrap.sh --with-toolset=clang --prefix=./c++11_build  cxxflags="-std=c++11 -stdlib=libc++"
> ./b2 install

Graham

On Jul 3, 2012, at 12:05 PM, Howard Hinnant wrote:

> 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
> 
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users