On 31.07.2015 21:25, Miloslav Marik wrote:

Hi,

I would like to share my experience with boost when combining with c++11. I hope it might help someone.

Suppose a simple program:

#include #include <iostream>

using boost::asio::detail::atomic_count;

struct Test { // Whether the task has been interrupted. bool task_interrupted_;

// The count of unfinished work. atomic_count outstanding_work_; };

int main () { std::cout << "Size is " << sizeof(Test) << std::endl; return 0; } And here is the story:

$ /opt/gcc-4.8.4/bin/g++ -std=c++11 -I /opt/boost-1.58.0/include/ -L /opt/boost-1.58.0/lib -lboost_system b.cpp $ ./a.out Size is 16 $ /opt/gcc-4.8.4/bin/g++ -I /opt/boost-1.58.0/include/ -L /opt/boost-1.58.0/lib -lboost_system b.cpp $ ./a.out Size is 8

It means that c++11 program cannot be linked with boost libraries compiled without "-std=c++11" option. It was asio in my case and the program was linked with libboost_log.so.1.58.0.

This is known: https://svn.boost.org/trac/boost/ticket/9207 Using BOOST_ASIO_DISABLE_STD_ATOMIC helps and would yield size 8. But the ticket is wrong, the problem exists with clang, too. On OS/X, at least. Cheers, Leon