gcc upstream has at least unified the C++98(03) and C++11 abis in gcc-5 [1] and declared the C++11 abi stable. This could resolve [2] in the "near" future..
Best, Matthias [1] https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html [2] https://bugs.gentoo.org/show_bug.cgi?id=542482
