> The *only* time you should use a libstdc++ different from the system-provided > one (or ones, on 10.7) is the current LibcxxOnOlderSystems --- which > explicitly loses compatibility with all Apple-provided C++ libraries Please forgive my ignorance, but doesn’t setting _GLIBCXX_USE_CXX11_ABI=0 make the 4.2 libstdc++ from the system and the 5.1 libstdc++ from MacPorts ABI compatible (https://gcc.gnu.org/onlinedocs/gcc-5.2.0/libstdc++/manual/manual/using_dual_abi.html)?
> gcc 5.1 libstdc++ is GPL3 and poses significant license issues with respect > to distributing binaries, among others. Again, there may be something important I am missing, but isn’t there a GCC runtime library exceptions that ameliorates this concern (https://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html)? Thanks, Marcus
