https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71221
--- Comment #1 from Tom Honermann <tom at honermann dot net> --- (In reply to Tom Honermann from comment #0) > $ g++ --version > g++ (Ubuntu 5.2.1-22ubuntu2) 5.2.1 20151010 Oops, I ran the above in the wrong terminal session. The correct gcc version info is: $ g++ --version g++ (GCC) 7.0.0 20160518 (experimental) ...