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398
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1 /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
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2
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3 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3, or (at your option)
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8 any later version.
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9
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10 This program 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
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13 GNU 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 General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 /* Written by Eric Blake. */
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20
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21 /*
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22 * POSIX 2008 <stddef.h> for platforms that have issues.
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23 * <http://www.opengroup.org/susv3xbd/stddef.h.html>
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24 */
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25
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26 #if __GNUC__ >= 3
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27 @PRAGMA_SYSTEM_HEADER@
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28 #endif
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29
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30 #if defined __need_wchar_t || defined __need_size_t \
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31 || defined __need_ptrdiff_t || defined __need_NULL \
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32 || defined __need_wint_t
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33 /* Special invocation convention inside gcc header files. In
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34 particular, gcc provides a version of <stddef.h> that blindly
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35 redefines NULL even when __need_wint_t was defined, even though
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36 wint_t is not normally provided by <stddef.h>. Hence, we must
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37 remember if special invocation has ever been used to obtain wint_t,
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38 in which case we need to clean up NULL yet again. */
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39
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40 # if !(defined _GL_STDDEF_H && defined _GL_STDDEF_WINT_T)
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41 # ifdef __need_wint_t
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42 # undef _GL_STDDEF_H
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43 # define _GL_STDDEF_WINT_T
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44 # endif
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45 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@
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46 # endif
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47
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48 #else
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49 /* Normal invocation convention. */
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50
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51 # ifndef _GL_STDDEF_H
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52
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53 /* The include_next requires a split double-inclusion guard. */
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54
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55 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@
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56
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57 # ifndef _GL_STDDEF_H
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58 # define _GL_STDDEF_H
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59
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60 /* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
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61 #if @REPLACE_NULL@
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62 # undef NULL
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63 # ifdef __cplusplus
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64 /* ISO C++ says that the macro NULL must expand to an integer constant
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65 expression, hence '((void *) 0)' is not allowed in C++. */
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66 # if __GNUG__ >= 3
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67 /* GNU C++ has a __null macro that behaves like an integer ('int' or
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68 'long') but has the same size as a pointer. Use that, to avoid
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69 warnings. */
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70 # define NULL __null
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71 # else
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72 # define NULL 0L
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73 # endif
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74 # else
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75 # define NULL ((void *) 0)
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76 # endif
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77 #endif
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78
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79 /* Some platforms lack wchar_t. */
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80 #if !@HAVE_WCHAR_T@
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81 # define wchar_t int
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82 #endif
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83
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84 # endif /* _GL_STDDEF_H */
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85 # endif /* _GL_STDDEF_H */
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86 #endif /* __need_XXX */
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