// Copyright (C) 2020 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-options "-pthread"  }
// { dg-do run { target *-*-linux-gnu } }
// { dg-require-effective-target pthread }

// PR libstdc++/96817

int init()
{
#if __has_include(<sys/single_threaded.h>)
  // This deadlocks unless __libc_single_threaded is available in Glibc,
  // because __cxa_guard_acquire uses __gthread_active_p and the
  // multithreaded init can't detect recursion (see PR 97211).
  static int i = init();
#endif
  return 0;
}

int
main (int argc, char **argv)
{
  init();
}