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

   1 // Specific definitions for Darwin -*- C++ -*-
   2
   3 // Copyright (C) 2004 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30
  31 #ifndef _GLIBCXX_OS_DEFINES
  32 #define _GLIBCXX_OS_DEFINES 1
  33
  34 // System-specific #define, typedefs, corrections, etc, go here.  This
  35 // file will come before all others.
  36
  37 /* Darwin has the pthread routines in libSystem, which every program
  38    links to, so there's no need for weak-ness for that.  */
  39 #define _GLIBCXX_GTHREAD_USE_WEAK 0
  40
  41 // On Darwin, in order to enable overriding of operator new and delete,
  42 // GCC makes the definition of these functions weak, relies on the
  43 // loader to implement weak semantics properly, and uses
  44 // -flat_namespace to work around the way that it doesn't.
  45 #define _GLIBCXX_WEAK_DEFINITION __attribute__ ((weak))
  46
  47 #endif