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diff --git a/src/gl/flexmember.h b/src/gl/flexmember.h
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-/* Sizes of structs with flexible array members.
-
- Copyright 2016 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- Written by Paul Eggert. */
-
-#include <stddef.h>
-
-/* Nonzero multiple of alignment of TYPE, suitable for FLEXSIZEOF below.
- On older platforms without _Alignof, use a pessimistic bound that is
- safe in practice even if FLEXIBLE_ARRAY_MEMBER is 1.
- On newer platforms, use _Alignof to get a tighter bound. */
-
-#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
-# define FLEXALIGNOF(type) (sizeof (type) & ~ (sizeof (type) - 1))
-#else
-# define FLEXALIGNOF(type) _Alignof (type)
-#endif
-
-/* Upper bound on the size of a struct of type TYPE with a flexible
- array member named MEMBER that is followed by N bytes of other data.
- This is not simply sizeof (TYPE) + N, since it may require
- alignment on unusually picky C11 platforms, and
- FLEXIBLE_ARRAY_MEMBER may be 1 on pre-C11 platforms.
- Yield a value less than N if and only if arithmetic overflow occurs. */
-
-#define FLEXSIZEOF(type, member, n) \
- ((offsetof (type, member) + FLEXALIGNOF (type) - 1 + (n)) \
- & ~ (FLEXALIGNOF (type) - 1))