http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50454
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-09-19 11:44:23 UTC --- Scratch "but still isn't entirely OK, I can still trigger errors post 40856 for the following user code snippet compiled with -std=gnu++0x -pedantic-errors on, eg, x86_64-linux". Luckily for PR40856, this isn't true (was using an old tree). Thus the problem is entirely restricted to __int128 and unsigned __int128.
