http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53838
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-03 11:52:17 UTC --- This is not a GCC bug, please report it to MacPorts not here. At a guess I'd say you're linking to the system libstdc++.so not the one from your mp builds, and the mp builds do not use the same setting for --enable-fully-dynamic-string as the system libs.
