libstdc++-v3/config/os/bsd/darwin/os_defines.h

   1 // Specific definitions for Darwin -*- C++ -*-
   2
   3 // Copyright (C) 2004-2013 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,
  37 // GCC makes the definition of these functions weak, relies on the
  38 // loader to implement weak semantics properly, and uses
  39 // -flat_namespace to work around the way that it doesn't.
  40 #define _GLIBCXX_WEAK_DEFINITION __attribute__ ((weak))
  41
  42 // Static initializer macro is buggy in darwin, see libstdc++/51906
  43 #define _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC
  44
  45 // Configure checks for nanosleep fail on Darwin, but nanosleep and
  46 // sched_yield are always available, so use them.
  47 #define _GLIBCXX_USE_NANOSLEEP 1
  48 #define _GLIBCXX_USE_SCHED_YIELD 1
  49
  50 #endif