https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88385
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2018-12-21 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Current trunk works for me and prints > ./cc1plus -quiet t.ii -std=c++17 t.ii:11:17: warning: inline function ‘constexpr compressed_tuple_<Ts>::compressed_tuple_(Args&& ...) [with Args = {int, int}; Ts = {int, int}]’ used but never defined 11 | constexpr compressed_tuple_(Args &&... args) | ^~~~~~~~~~~~~~~~~ can you confirm this is fixed?