1 /* Declare the environ system variable.
2    Copyright (C) 2015-2016 Free Software Foundation, Inc.
3 
4 This file is part of the libiberty library.
5 Libiberty is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9 
10 Libiberty is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 Library General Public License for more details.
14 
15 You should have received a copy of the GNU Library General Public
16 License along with libiberty; see the file COPYING.LIB.  If not,
17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA.  */
19 
20 /* On OSX, the environ variable can be used directly in the code of an
21    executable, but cannot be used in the code of a shared library (such as
22    GCC's liblto_plugin, which links in libiberty code).  Instead, the
23    function _NSGetEnviron can be called to get the address of environ.  */
24 
25 #ifndef HAVE_ENVIRON_DECL
26 #  ifdef __APPLE__
27 #     include <crt_externs.h>
28 #     define environ (*_NSGetEnviron ())
29 #  else
30 extern char **environ;
31 #  endif
32 #  define HAVE_ENVIRON_DECL
33 #endif
34