libstdc++-v3/testsuite/19_diagnostics/system_error/what-3.cc

// { dg-do run { target c++11 } }

// Copyright (C) 2007-2021 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 <string>
#include <system_error>
#include <testsuite_hooks.h>

// test copy ctors, assignment operators, and persistence of member string data
// libstdc++/1972
// via Greg Bumgardner <bumgard@roguewave.com>
void allocate_on_stack(void) 
{
  const size_t num = 512;
  __extension__ char array[num];
  for (size_t i = 0; i < num; i++) 
    array[i]=0;
  // Suppress unused warnings.
  for (size_t i = 0; i < num; i++) 
    array[i]=array[i];
}

void test04()
{
  const std::string s("CA ISO emergency once again:immediate power down");
  const char* strlit1 = "wish I lived in Palo Alto";
  const char* strlit2 = "...or Santa Barbara";
  std::system_error obj1(std::error_code(), s);
  
  // block 01
  {
    const std::string s2(strlit1);
    std::system_error obj2(std::error_code(), s2);
    obj1 = obj2;
  }
  allocate_on_stack();
  VERIFY( std::string(obj1.what()).find(strlit1) != std::string::npos ); 

  // block 02
  {
    const std::string s3(strlit2);
    std::system_error obj3 = std::system_error(std::error_code(), s3);
    obj1 = obj3;
  }
  allocate_on_stack();     
  VERIFY( std::string(obj1.what()).find(strlit2) != std::string::npos ); 
}

int main(void)
{
  test04();
  return 0;
}