Hi, If I have a static library A that builds with default std with another header only library B, and then my program links library A and uses some classes in library B with -std=c++0x. Will this usage create any issue? I am running into an issue that one of the member variables in library B (boost ASIO to be precise) has a different memory address (only off by 4 bytes) over time. Any input is welcome. Thanks in advance. Cheers, Hei P.S. I am using GCC 4.6.x on CentOS 6.5.