I think boost needs fix in lockfree / detail / freelist.hpp to compile with GCC 4.6.3 as the GCC is stricter in namespace now. I see the change where "lockfree: add new wrapper to dispatch between boost::atomic and std::atomic", the team has made classification between the previous GCC (< 4.6 version) and use std::stomic for GCC (

4.6 ). Similar fix is needed when we instantiate an atomic pointer. Precede the instantiation of atomic in "lockfree" source files with "std::" .

Please let me know if the change exists already. On Mon, May 7, 2012 at 2:39 PM, Shailja Kumari <shalja.rudra@gmail.com> wrote:

Hi All,

I am using boost_1_47_0 and (GCC) 4.6.3. The C++ application on linux complains on the following in linking.

boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>

...

::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const'

/boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>

...

::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const'

collect2: ld returned 1 exit status

I looked into http://tim.klingt.org/code/projects/boost-lockfree/repository/revisions/423b...

and dowloaded lockfree changed files. But the issue still exists.

boost_1_47_0/boost/lockfree/detail/freelist.hpp:117: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>

...

::compare_exchange_weak(boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>&, boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>, std::memory_order)'

boost_1_47_0/boost/lockfree/detail/freelist.hpp:87: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>

...

::load(std::memory_order) const'

boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>

...

::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const'

Any idea on this ?