1  // Specific definitions for Darwin -*- C++ -*-
       2  
       3  // Copyright (C) 2004-2023 Free Software Foundation, Inc.
       4  //
       5  // This file is part of the GNU ISO C++ Library.  This library is free
       6  // software; you can redistribute it and/or modify it under the
       7  // terms of the GNU General Public License as published by the
       8  // Free Software Foundation; either version 3, or (at your option)
       9  // any later version.
      10  
      11  // This library is distributed in the hope that it will be useful,
      12  // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14  // GNU General Public License for more details.
      15  
      16  // Under Section 7 of GPL version 3, you are granted additional
      17  // permissions described in the GCC Runtime Library Exception, version
      18  // 3.1, as published by the Free Software Foundation.
      19  
      20  // You should have received a copy of the GNU General Public License and
      21  // a copy of the GCC Runtime Library Exception along with this program;
      22  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23  // <http://www.gnu.org/licenses/>.
      24  
      25  
      26  #ifndef _GLIBCXX_OS_DEFINES
      27  #define _GLIBCXX_OS_DEFINES 1
      28  
      29  // System-specific #define, typedefs, corrections, etc, go here.  This
      30  // file will come before all others.
      31  
      32  /* Darwin has the pthread routines in libSystem, which every program
      33     links to, so there's no need for weak-ness for that.  */
      34  #define _GLIBCXX_GTHREAD_USE_WEAK 0
      35  
      36  // On Darwin, in order to enable overriding of operator new and delete, the
      37  // ABI library exports a weak definition. The static linker will override this
      38  // iff a user-provided implementation is given (providing that the user
      39  // implementation is not itself a weak definition).
      40  #define _GLIBCXX_WEAK_DEFINITION __attribute__ ((__weak__))
      41  
      42  #if defined (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) \
      43       && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1080)
      44  // Static initializer macro is absent for Darwin < 11 and buggy in Darwin 11,
      45  // see libstdc++/51906.  Fixed in Darwin 12 (OS X 10.8).
      46  #define _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC
      47  #endif
      48  
      49  // Configure checks for nanosleep fail on Darwin, but nanosleep and
      50  // sched_yield are always available, so use them.
      51  #define _GLIBCXX_USE_NANOSLEEP 1
      52  #define _GLIBCXX_USE_SCHED_YIELD 1
      53  
      54  // No support for referencing weak symbols without a definition.
      55  #define _GLIBCXX_USE_WEAK_REF 0
      56  
      57  #endif