id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9041	[thread] Boost.Thread DSO's may need to link with Boost.Atomic	Petr Machata <pmachata@…>	viboes	"libs/thread/src/pthread/once.cpp includes libs/thread/src/pthread/once_atomic.cpp, which includes boost/atomic.hpp, which (transitively) includes boost/atomic/detail/lockpool.hpp, which, depending on whether BOOST_ATOMIC_FLAG_LOCK_FREE is set, may need external reference to boost::atomics::detail::lockpool::get_lock_for(void const volatile *), defined in libbost_atomic.so.1.54.0.

On most targets, BOOST_ATOMIC_FLAG_LOCK_FREE is set and the external reference is not necessary.  On some, such as s390, it's not, and when linking to libboost_thread.so.1.54.0, the linker complains about unsatisfied references to above-mentioned symbol, such as:

{{{
/lib64/libboost_thread.so.1.54.0: undefined reference to `boost::atomics::detail::lockpool::get_lock_for(void const volatile*)'
}}}

In attached patch, I resolve this by testing whether BOOST_ATOMIC_FLAG_LOCK_FREE is defined.  If not, I set up linking of libboost_atomic.so.1.54.0."	Bugs	closed	Boost 1.55.0	atomic	Boost 1.54.0	Problem	fixed