http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899
--- Comment #5 from Neil Nelson <nnelson at infowest dot com> 2012-07-09
16:06:11 UTC ---
Jonathan, (redi at gcc dot gnu.org <gcc-bugzi...@gcc.gnu.org>)
I installed g++-4.7 and obtained a good improvement over the prior
results with the following output
boost_lockfree/libs/lockfree/test$ g++-4.7 -std=c++0x bench_3.cpp -o bench_3
In file included from /usr/include/boost/lockfree/detail/atomic.hpp:15:0,
from ../../../boost/lockfree/fifo.hpp:26,
from bench_3.cpp:1:
/usr/include/c++/4.7/atomic: In instantiation of ‘struct
std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>
>’:
/usr/include/boost/lockfree/detail/freelist.hpp:203:29: required from here
/usr/include/c++/4.7/atomic:160:7: error: function
‘std::atomic<_Tp>::atomic() [with _Tp =
boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>]’
defaulted on its first declaration with an exception-specification that
differs from the implicit declaration
‘std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>
>::atomic()’
/usr/include/c++/4.7/atomic: In instantiation of ‘struct
std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::fifo<long
int, boost::lockfree::caching_freelist_t, std::allocator<long int>
>::node> >’:
../../../boost/lockfree/fifo.hpp:287:29: required from ‘class
boost::lockfree::detail::fifo<long int,
boost::lockfree::caching_freelist_t, std::allocator<long int> >’
../../../boost/lockfree/fifo.hpp:315:7: required from ‘class
boost::lockfree::fifo<long int>’
bench_3.cpp:18:5: required from here
/usr/include/c++/4.7/atomic:160:7: error: function
‘std::atomic<_Tp>::atomic() [with _Tp =
boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::fifo<long
int, boost::lockfree::caching_freelist_t, std::allocator<long int>
>::node>]’ defaulted on its first declaration with an
exception-specification that differs from the implicit declaration
‘std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::fifo<long
int, boost::lockfree::caching_freelist_t, std::allocator<long int>
>::node> >::atomic()’
Tim Blechmann posted on the Boost list this morning he was doing final
testing for the Boost 51 release. I will copy this to him in case he has
an idea. My impression is that g++ -std=c++0x and boost lockfree are
rather close.
Neil
On 07/09/2012 08:45 AM, redi at gcc dot gnu.org wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899
>
> --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-09
> 14:45:26 UTC ---
> (In reply to comment #2)
>> The lockfree code is invalid anyway because
>> boost::lockfree::detail::tagged_ptr
>> doesn't have a trivial default constructor, so it can't be used with
>> std::atomic
> Actually ignore that part - I misread the spec.
>
