https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92267
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Fri Nov 22 12:36:18 2019 New Revision: 278614 URL: https://gcc.gnu.org/viewcvs?rev=278614&root=gcc&view=rev Log: PR libstdc++/92267 fix ABI change in deque iterators Defaulting the copy constructor on its first declaration made it change from user-provided (and non-trivial) to implicitly-defined (and trivial). This caused an ABI incompatibility between GCC 8 and GCC 9, where functions taking a deque iterator disagree on the argument passing convention. Backport from mainline 2019-10-29 Jonathan Wakely <jwak...@redhat.com> PR libstdc++/92267 * include/bits/stl_deque.h (_Deque_iterator(const _Deque_iterator&)): Do not define as defaulted. * testsuite/23_containers/deque/types/92267.cc: New test. Added: branches/gcc-9-branch/libstdc++-v3/testsuite/23_containers/deque/types/92267.cc Modified: branches/gcc-9-branch/libstdc++-v3/ChangeLog branches/gcc-9-branch/libstdc++-v3/include/bits/stl_deque.h
