1 /* Declare the environ system variable. 2 Copyright (C) 2015-2020 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 # ifndef environ 31 extern char **environ; 32 # endif 33 # endif 34 # define HAVE_ENVIRON_DECL 35 #endif 36