include/environ.h

   1 /* Declare the environ system variable.
   2    Copyright (C) 2015-2017 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