os_defines.h revision 1.1 
1// Specific definitions for Darwin -*- C++ -*-
2
3// Copyright (C) 2004, 2009 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#endif
43