id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9207	different sizeof atomic_count (boost/asio/detail/atomic_count.hpp) type after comilation with --std=c++11 than after comilation without --std=c++11 (gcc, x86_64).	Karol Nowacki <karol.nowacki@…>	chris_kohlhoff	"atomic_count has different size when compiling with --std==c++11 (sizeof(long)) than compiling without --std=c++11 (sizof(int)). Hence classes which use atomic_count have different memory layout of members depending on --std compilation option. This leads to troubles when  program is built from object files compiled with --std=c++11 and files compiled without --std=c++11. 

This phenomena is not visible for clang (clang std lib contains std::atomic)
Problem is also not visible on i386  (sizeof(long) == sizeof(int))

Problem exists in 1.54 and on the trunk. 

In attached example task_io_service has different size in two compilation units. This leads to segmentation fault. "	Bugs	closed	To Be Determined	asio	Boost 1.54.0	Problem	invalid