1/* Copyright (C) 1992-2025 Free Software Foundation, Inc.
 2   This file is part of the GNU C Library.
 3
 4   The GNU C Library is free software; you can redistribute it and/or
 5   modify it under the terms of the GNU Lesser General Public
 6   License as published by the Free Software Foundation; either
 7   version 2.1 of the License, or (at your option) any later version.
 8
 9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#ifndef	_ALLOCA_H
19#define	_ALLOCA_H	1
20
21#include <features.h>
22
23#define	__need_size_t
24#include <stddef.h>
25
26__BEGIN_DECLS
27
28/* Remove any previous definition.  */
29#undef	alloca
30
31/* Allocate a block that will be freed when the calling function exits.  */
32extern void *alloca (size_t __size) __THROW;
33
34#ifdef	__GNUC__
35# define alloca(size)	__builtin_alloca (size)
36#endif /* GCC.  */
37
38__END_DECLS
39
40#endif /* alloca.h */