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gcc6-pr86751.patch
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File gcc6-pr86751.patch of Package cross-arm-gcc6
Revert 2018-10-15 Jonathan Wakely <jwakely@redhat.com> Backport from mainline 2018-07-31 Jonathan Wakely <jwakely@redhat.com> PR libstdc++/86751 * include/bits/stl_pair.h (__pair_base): New class with deleted copy assignment operator. (pair): Derive from __pair_base. (pair::operator=): Remove deleted overload. * python/libstdcxx/v6/printers.py (StdPairPrinter): New pretty printer so that new base class isn't shown in GDB. * testsuite/20_util/pair/86751.cc: New test. * testsuite/20_util/pair/ref_assign.cc: New test. Index: libstdc++-v3/python/libstdcxx/v6/printers.py =================================================================== --- libstdc++-v3/python/libstdcxx/v6/printers.py (revision 265161) +++ libstdc++-v3/python/libstdcxx/v6/printers.py (revision 265162) @@ -1062,6 +1062,39 @@ class StdExpPathPrinter: return self._iterator(self.val['_M_cmpts']) +class StdPairPrinter: + "Print a std::pair object, with 'first' and 'second' as children" + + def __init__(self, typename, val): + self.val = val + + class _iter(Iterator): + "An iterator for std::pair types. Returns 'first' then 'second'." + + def __init__(self, val): + self.val = val + self.which = 'first' + + def __iter__(self): + return self + + def __next__(self): + if self.which is None: + raise StopIteration + which = self.which + if which == 'first': + self.which = 'second' + else: + self.which = None + return (which, self.val[which]) + + def children(self): + return self._iter(self.val) + + def to_string(self): + return None + + # A "regular expression" printer which conforms to the # "SubPrettyPrinter" protocol from gdb.printing. class RxPrinter(object): @@ -1377,6 +1410,7 @@ def build_libstdcxx_dictionary (): libstdcxx_printer.add_container('std::', 'map', StdMapPrinter) libstdcxx_printer.add_container('std::', 'multimap', StdMapPrinter) libstdcxx_printer.add_container('std::', 'multiset', StdSetPrinter) + libstdcxx_printer.add_version('std::', 'pair', StdPairPrinter) libstdcxx_printer.add_version('std::', 'priority_queue', StdStackOrQueuePrinter) libstdcxx_printer.add_version('std::', 'queue', StdStackOrQueuePrinter) Index: libstdc++-v3/include/bits/stl_pair.h =================================================================== --- libstdc++-v3/include/bits/stl_pair.h (revision 265161) +++ libstdc++-v3/include/bits/stl_pair.h (revision 265162) @@ -181,8 +181,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct __wrap_nonesuch : std::__nonesuch { explicit __wrap_nonesuch(const __nonesuch&) = delete; }; - -#endif +#endif // C++11 + + class __pair_base + { +#if __cplusplus >= 201103L + template<typename _T1, typename _T2> friend struct pair; + __pair_base() = default; + ~__pair_base() = default; + __pair_base(const __pair_base&) = default; + __pair_base& operator=(const __pair_base&) = delete; +#endif // C++11 + }; /** * @brief Struct holding two objects of arbitrary type. @@ -192,6 +202,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION */ template<typename _T1, typename _T2> struct pair + : private __pair_base { typedef _T1 first_type; /// @c first_type is the first bound type typedef _T2 second_type; /// @c second_type is the second bound type @@ -372,17 +383,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION pair& operator=(typename conditional< - __not_<__and_<is_copy_assignable<_T1>, - is_copy_assignable<_T2>>>::value, - const pair&, const __wrap_nonesuch&>::type __p) = delete; - - pair& - operator=(typename conditional< __and_<is_move_assignable<_T1>, is_move_assignable<_T2>>::value, pair&&, __wrap_nonesuch&&>::type __p) noexcept(__and_<is_nothrow_move_assignable<_T1>, - is_nothrow_move_assignable<_T2>>::value) + is_nothrow_move_assignable<_T2>>::value) { first = std::forward<first_type>(__p.first); second = std::forward<second_type>(__p.second); Index: libstdc++-v3/testsuite/20_util/pair/ref_assign.cc =================================================================== --- libstdc++-v3/testsuite/20_util/pair/ref_assign.cc (nonexistent) +++ libstdc++-v3/testsuite/20_util/pair/ref_assign.cc (revision 265162) @@ -0,0 +1,74 @@ +// Copyright (C) 2018 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 run { target c++11 } } + +#include <utility> +#include <testsuite_hooks.h> + +void +test01() +{ + typedef std::pair<int&, int> pair_type; + int i = 1; + int j = 2; + pair_type p(i, 3); + const pair_type q(j, 4); + p = q; + VERIFY( p.first == q.first ); + VERIFY( p.second == q.second ); + VERIFY( i == j ); +} + +void +test02() +{ + typedef std::pair<int, int&> pair_type; + int i = 1; + int j = 2; + pair_type p(3, i); + const pair_type q(4, j); + p = q; + VERIFY( p.first == q.first ); + VERIFY( p.second == q.second ); + VERIFY( i == j ); +} + +void +test03() +{ + typedef std::pair<int&, int&> pair_type; + int i = 1; + int j = 2; + int k = 3; + int l = 4; + pair_type p(i, j); + const pair_type q(k, l); + p = q; + VERIFY( p.first == q.first ); + VERIFY( p.second == q.second ); + VERIFY( i == k ); + VERIFY( j == l ); +} + +int +main() +{ + test01(); + test02(); + test03(); +} Index: libstdc++-v3/testsuite/20_util/pair/86751.cc =================================================================== --- libstdc++-v3/testsuite/20_util/pair/86751.cc (nonexistent) +++ libstdc++-v3/testsuite/20_util/pair/86751.cc (revision 265162) @@ -0,0 +1,33 @@ +// Copyright (C) 2018 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 <utility> + +struct X { + template<typename T> operator T() const; +}; + + +void +test01() +{ + std::pair<int, int> p; + X x; + p = x; // PR libstdc++/86751 +}
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