Hi! I'm having an issue with archive portability. As I'm quite new to the internals of boost, I hope my attempt at pinpointing the problem is sensible: #include <iostream> #include <boost/serialization/vector.hpp> int main() { std::cerr << boost::serialization::implementation_level <std::vector <long long> >::value << std::endl; return 0; } built on a x86_64 platform prints out "3", on a i386 platform it prints out "2". I tested this both with boost 1.33.1 and 1.34.1. It is my guess that it causes the serialization of the used type to result in a larger archive on x86_64 than on i386. (Which is the original problem that led me to discover this) So my question is: is this the result of a bug in boost? If not, then what is the explanation of this difference? Using linux-2.6 with gcc. Thanks, Stefaan