[Bug libstdc++/59829] Calling vector::data() occurs undefined behavior when the vector is empty

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59829

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
proposed fix: http://gcc.gnu.org/ml/gcc-patches/2014-01/msg01719.html