id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10994	Using boost::atomic for 128-bit type results in build error with GCC 4.4	Martin Srom <srom.martin@…>	timblechmann	"When using boost::atomic with 128-bit type it results into a build error with GCC 4.4. 

With GCC 4.6 it works fine.
With 64-bit type it works fine.

Minimal example:

'''main.cpp''':
{{{
#include <boost/atomic.hpp>

int main()
{
    boost::atomic<__int128_t> variable(0);
    variable.load();   
} 
}}}

'''Build command''':
{{{
g++-4.4 -O3 -mcx16 main.cpp -Iboost_1_57_0/
}}}

'''Error output''':
{{{
boost_1_57_0/boost/atomic/detail/ops_gcc_x86_dcas.hpp: In function ‘int main()’:
boost_1_57_0/boost/atomic/detail/ops_gcc_x86_dcas.hpp:261: error: impossible constraint in ‘asm’
}}}"	Bugs	closed	To Be Determined	atomic	Boost 1.57.0	Problem	fixed		Andrey.Semashev@…