https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65146
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Fri, 20 Feb 2015, alexey.lapshin at oracle dot com wrote: > Alignment of single _Atomic object match with documentation : > https://gcc.gnu.org/wiki/Atomic/GCCMM/UnalignedPolicy . That's not documentation. Implementation differences from early plans are not a bug. Differences in alignment are only bugs if they mean atomic operations *fail to be atomic*.