text: // Control various target specific ABI tweaks.  Generic version.
  
  // Copyright (C) 2004-2014 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.
  
  // Under Section 7 of GPL version 3, you are granted additional
  // permissions described in the GCC Runtime Library Exception, version
  // 3.1, as published by the Free Software Foundation.
  
  // You should have received a copy of the GNU General Public License and
  // a copy of the GCC Runtime Library Exception along with this program;
  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  // <http://www.gnu.org/licenses/>.
  
  /** @file bits/cxxabi_tweaks.h
   *  This is an internal header file, included by other library headers.
   *  Do not attempt to use it directly. @headername{cxxabi.h}
   */
  
  #ifndef _CXXABI_TWEAKS_H
  #define _CXXABI_TWEAKS_H 1
  
  #ifdef __cplusplus
  namespace __cxxabiv1
  {
    extern "C" 
    {
  #endif
  
    // The generic ABI uses the first byte of a 64-bit guard variable.
  #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
  #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
  #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
  #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
  #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
    __extension__ typedef int __guard __attribute__((mode (__DI__)));
  
    // __cxa_vec_ctor has void return type.
    typedef void __cxa_vec_ctor_return_type;
  #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
    // Constructors and destructors do not return a value.
    typedef void __cxa_cdtor_return_type;
  
  #ifdef __cplusplus
    }
  } // namespace __cxxabiv1
  #endif
  
  #endif 
  