https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77402
Bug ID: 77402 Summary: Use EBO for _Rb_tree_impl::_M_key_compare Product: gcc Version: 7.0 Status: UNCONFIRMED Keywords: ABI Severity: enhancement Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- We could use the empty base-class optimization to reduce the size of RB trees by combining the _Key_compare object with _M_node_count. This would be an ABI break, so can only be enabled for the gnu-versioned-namespace config.