[Bug c/51088] undefined label with statement expression and cond expression

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51088

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Patch to give an error if taking an address of a label defined in ({}):
http://gcc.gnu.org/ml/gcc-patches/2014-04/msg00381.html