http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53059
--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-04-22 19:18:13 UTC --- That last situation is really totally unsupported and never was. By the way, I don't know if you noticed already, but it doesn't work for many, many, reasons outside sizes of containers. It's totally broken everywhere. The linker should also warn about that, I think we have a PR, it's a much more general issue, warn when linking together stuff built passing ABI-incompatible switches.