[Bug c++/53899] [C++0x] undefined reference to std::atomic

[nnelson at infowest dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899

--- Comment #5 from Neil Nelson  2012-07-09 
16:06:11 UTC ---
Jonathan, (redi at gcc dot 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
 
 >’:
/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]’ 
defaulted on its first declaration with an exception-specification that 
differs from the implicit declaration 
‘std::atomic
 
 >::atomic()’
/usr/include/c++/4.7/atomic: In instantiation of ‘struct 
std::atomic 
 >::node> >’:
../../../boost/lockfree/fifo.hpp:287:29:   required from ‘class 
boost::lockfree::detail::fifo >’
../../../boost/lockfree/fifo.hpp:315:7:   required from ‘class 
boost::lockfree::fifo’
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 
 >::node>]’ defaulted on its first declaration with an 
exception-specification that differs from the implicit declaration 
‘std::atomic 
 >::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  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.
>

[Bug c++/53899] [C++0x] undefined reference to std::atomic

[nnelson at infowest dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899

--- Comment #3 from Neil Nelson  2012-07-09 
14:34:18 UTC ---
Redi,

Thank you for your very quick and detailed responses. Looks like I have 
some work to do on my end. I will copy this to the boost lockfree author.

Neil

On 07/09/2012 08:30 AM, redi at gcc dot gnu.org wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899
>
> --- Comment #2 from Jonathan Wakely  2012-07-09 
> 14:30:28 UTC ---
> 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
>

[Bug c++/53899] New: [C++0x] undefined reference to std::atomic

[nnelson at infowest dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53899

 Bug #: 53899
   Summary: [C++0x] undefined reference to
std::atomichttp://tim.klingt.org/boost_lockfree.tar.gz

The following program when compiled and executed from libs/lockfree/test
(including the other required boost distribution components), a folder in the
prior gz, will work OK using

g++ bench_3.cpp -o bench_3

but gives errors of the following kind when using 

g++ -std=c++0x bench_3.cpp -o bench_3

undefined reference to
`std::atomic >::node>
>::load(std::memory_order) const'

undefined reference to
`std::atomic >::node>
>::compare_exchange_weak(boost::lockfree::detail::tagged_ptr >::node>&,
boost::lockfree::detail::tagged_ptr >::node>,
std::memory_order)'

undefined reference to
`std::atomic >::node>
>::store(boost::lockfree::detail::tagged_ptr >::node>,
std::memory_order)'

This item may be along the line given in

Bug 49445 [C++0x] Undefined reference to std::atomic "operator float"

Thank you.

Neil


// bench_3.cpp
#include "../../../boost/lockfree/fifo.hpp"

int elements = 100;
int iterations = 50;

#define FIFO \
boost::lockfree::fifo f(elements);

#define FIFO_FULL \
boost::lockfree::fifo f(elements); \
for (int i = 0; i != elements; ++i) \
f.enqueue_unsafe(i); \

__attribute__ ((noinline))
__attribute__ ((flatten))
void test_fifo_push(void)
{
FIFO
for (int i = 0; i != elements; ++i)
f.enqueue(i);
}

__attribute__ ((noinline))
__attribute__ ((flatten))
void test_fifo_pop(void)
{
FIFO_FULL
long out;
for (int i = 0; i != elements; ++i)
f.dequeue(out);
}

int main()
{
for (int i = 0; i != iterations; ++i)
test_fifo_push();

for (int i = 0; i != iterations; ++i)
test_fifo_pop();
}