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1 /* Declare the environ system variable.
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2 Copyright (C) 2015-2020 Free Software Foundation, Inc.
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3
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4 This file is part of the libiberty library.
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5 Libiberty is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 Libiberty is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with libiberty; see the file COPYING.LIB. If not,
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17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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18 Boston, MA 02110-1301, USA. */
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19
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20 /* On OSX, the environ variable can be used directly in the code of an
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21 executable, but cannot be used in the code of a shared library (such as
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22 GCC's liblto_plugin, which links in libiberty code). Instead, the
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23 function _NSGetEnviron can be called to get the address of environ. */
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24
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25 #ifndef HAVE_ENVIRON_DECL
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26 # ifdef __APPLE__
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27 # include <crt_externs.h>
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28 # define environ (*_NSGetEnviron ())
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29 # else
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30 # ifndef environ
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31 extern char **environ;
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32 # endif
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33 # endif
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34 # define HAVE_ENVIRON_DECL
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35 #endif
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