libstdc++-v3/testsuite/29_atomics/atomic/62259.cc

   1 // Copyright (C) 2015-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++11 } }
  19 // { dg-require-atomic-builtins "" }
  20 // { dg-require-cstdint "" }
  21
  22 #include <atomic>
  23 #include <cstdint>
  24
  25 using std::int32_t;
  26 using std::int64_t;
  27
  28 // libstdc++/62259
  29
  30 struct twoints {
  31   int32_t a;
  32   int32_t b;
  33 };
  34
  35 static_assert( alignof(std::atomic<twoints>) >= alignof(int64_t),
  36                "std::atomic not suitably aligned" );
  37
  38 // libstdc++/65147
  39
  40 struct power_of_two_obj {
  41     char c [8];
  42 };
  43
  44 std::atomic<power_of_two_obj> obj1;
  45
  46 static_assert( __alignof__(obj1) >= alignof(int64_t),
  47                "std::atomic not suitably aligned" );
  48
  49 struct container_struct {
  50    char c[1];
  51    std::atomic<power_of_two_obj> ao;
  52 };
  53
  54 container_struct obj2;
  55
  56 static_assert( __alignof__(obj2.ao) >= alignof(int64_t),
  57                "std::atomic not suitably aligned" );