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re PR libstdc++/60695 (std::atomic<X> doesn't work when X is of zero size)

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PR libstdc++/60695
	* include/std/atomic (atomic<_Tp>): Add static assertion.
	* testsuite/29_atomics/atomic/60695.cc: New.

From-SVN: r209418
This commit is contained in:
Jonathan Wakely 2014-04-15 14:48:07 +01:00 • committed by Jonathan Wakely
parent b9ed2c2ce1
commit 9ffc6d0bc2
3 changed files with 39 additions and 0 deletions
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4
libstdc++-v3/ChangeLog
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@ -3,6 +3,10 @@
PR libstdc++/60734
* include/bits/stl_tree.h (_Rb_tree::_M_end): Fix invalid cast.
PR libstdc++/60695
* include/std/atomic (atomic<_Tp>): Add static assertion.
* testsuite/29_atomics/atomic/60695.cc: New.
2014-04-14 Jonathan Wakely <jwakely@redhat.com>
* include/bits/stl_vector.h (_Vector_base::_Vector_impl,

5
libstdc++-v3/include/std/atomic
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@ -163,6 +163,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
private:
_Tp _M_i;
// TODO: static_assert(is_trivially_copyable<_Tp>::value, "");
static_assert(sizeof(_Tp) > 0,
"Incomplete or zero-sized types are not supported");
public:
atomic() noexcept = default;
~atomic() noexcept = default;

30
libstdc++-v3/testsuite/29_atomics/atomic/60695.cc Normal file
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@ -0,0 +1,30 @@
// { dg-require-atomic-builtins "" }
// { dg-options "-std=gnu++11" }
// { dg-do compile }
// Copyright (C) 2014 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/>.
#include <atomic>
// libstdc++/60695
struct X {
char stuff[0]; // GNU extension, type has zero size
};
std::atomic<X> a; // { dg-error "not supported" "" { target *-*-* } 168 }