https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93209
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |documentation --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- Note the behavior is probably dependent on the ABI. Mixing different underlying types for the same bit group makes this interesting. Does it change anything if you make b and i itself volatile (rather than just s)?