id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9161	two definitions of future_object_base in v1.53 and 1.54	jennifer.l.jiang@…	viboes	"Our testing with icpc on Linux found one strange issue related to “BOOST_THREAD_VERSION”. 

When building the boost thread library (libboost_thread.a), we found that “BOOST_THREAD_VERSION” is defined as “2”, but when the test case (i.e set_exception_at_thread_exit_pass.cpp) is built, the “BOOST_THREAD_VERSION” is “4”. So when “-ipo” Is used, icpc gives link errors because two definitions of the same class “struct future_object_base : enable_shared_from_this<future_object_base>” is used. 

But Gcc seems working fine with its whole program optimization. 
"	Bugs	closed	Boost 1.55.0	thread	Boost 1.54.0	Problem	fixed	BOOST_THREAD_VERSION