1  /* Declare the environ system variable.
       2     Copyright (C) 2015-2023 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