https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70452
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It would surprise me if the TREE_BLOCKS mattered much, but I don't see why anything would need those. In any case, this probably started with the C++14 constexpr support, maybe it would be better to copy less by copying only when you change something.