https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101062
--- Comment #15 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > Eric, any idea what's going on? Shall I readd if (TREE_CODE (t) == > QUAL_UNION_TYPE) return; at the start function and thus ignore > QUAL_UNION_TYPE and handle only UNION_TYPEs, or should the bitfield > representatives in QUAL_UNION_TYPE get some DECL_QUALIFIER (either one that > always evaluates to false, or the same as corresponding bitfield), something > else? Let's try the former, i.e. disable the new code for QUAL_UNION_TYPE.