https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112307
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- I explained this in PR 109945 comment 25 There is no guaranteed copy elision for objects with a trivial copy constructor and trivial (or deleted) destructor. The compiler is allowed to make temporary copies, to allow passing the object in registers (which has been what the ABI requires for decades longer than the guaranteed copy elision rules have existed). If you want to have self-referential pointers in your object then you need to ensure copies really are elided. And so it should not be trivially copyable, because that removes the guarantee of copy elision.
