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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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1 /* Sizes of structs with flexible array members.
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2
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3 Copyright 2016-2019 Free Software Foundation, Inc.
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4
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5 This file is part of the GNU C Library.
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6
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7 The GNU C Library is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU Lesser General Public
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9 License as published by the Free Software Foundation; either
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10 version 2.1 of the License, or (at your option) any later version.
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11
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12 The GNU C Library is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Lesser General Public License for more details.
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16
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17 You should have received a copy of the GNU Lesser General Public
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18 License along with the GNU C Library; if not, see
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19 <https://www.gnu.org/licenses/>.
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20
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21 Written by Paul Eggert. */
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22
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23 #include <stddef.h>
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24
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25 /* Nonzero multiple of alignment of TYPE, suitable for FLEXSIZEOF below.
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26 On older platforms without _Alignof, use a pessimistic bound that is
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27 safe in practice even if FLEXIBLE_ARRAY_MEMBER is 1.
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28 On newer platforms, use _Alignof to get a tighter bound. */
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29
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30 #if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
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31 # define FLEXALIGNOF(type) (sizeof (type) & ~ (sizeof (type) - 1))
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32 #else
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33 # define FLEXALIGNOF(type) _Alignof (type)
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34 #endif
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35
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36 /* Upper bound on the size of a struct of type TYPE with a flexible
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37 array member named MEMBER that is followed by N bytes of other data.
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38 This is not simply sizeof (TYPE) + N, since it may require
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39 alignment on unusually picky C11 platforms, and
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40 FLEXIBLE_ARRAY_MEMBER may be 1 on pre-C11 platforms.
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41 Yield a value less than N if and only if arithmetic overflow occurs. */
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42
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43 #define FLEXSIZEOF(type, member, n) \
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44 ((offsetof (type, member) + FLEXALIGNOF (type) - 1 + (n)) \
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45 & ~ (FLEXALIGNOF (type) - 1))