libstc++ string

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

Trying to compile rust on -current/amd64 with native gcc, I see

          /usr/obj/pkgsrc/lang/rust/work.x86_64/rustc-1.20.0-src/build/x86_64-unknown-netbsd/stage0-rustc/x86_64-unknown-netbsd/release/deps/librustc_llvm-04702823b9bfc8a0.so: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct(unsigned long, char)'     

I have seen something similar on other boxen in other packages.
I vaguely remember something about gcc having a std::string kludge.
Is there something I need to rebuild to do proper kludge removal? (or is
it unrelated?)

Cheers,

Patrick