https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111050
--- Comment #2 from TC <rs2740 at gmail dot com> --- The impacted members we observed are `_Hash_node_value_base::_M_valptr` and `_Hash_node_value_base::_M_v`. I think the layout of `_Hash_node` didn't change. And I'm not seeing why fixing this will require breaking ABI again. For example, if the affected functions are marked always_inline (or renamed, or have their mangling otherwise changed), I would expect the resulting code to be linkable with either the GCC10 version or the current version of the code, unless I'm missing something?