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.

	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.

From-SVN: r277577

1 files changed, 27 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/23_containers/deque/types/92267.cc b/libstdc++-v3/testsuite/23_containers/deque/types/92267.cc
new file mode 100644
index 00000000000..cab8d25f0db
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/deque/types/92267.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do compile { target c++11 } }
+
+#include <deque>
+
+using std::deque;
+using std::is_trivially_copy_constructible;
+
+// PR libstdc++/92267
+static_assert(!is_trivially_copy_constructible<deque<int>::iterator>::value);
+static_assert(!is_trivially_copy_constructible<deque<int>::const_iterator>::value);