✏ EDIT: alloca.h

/* Copyright (C) 1992-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

The GNU C Library 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
   Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef	_ALLOCA_H
#define	_ALLOCA_H	1

#include <features.h>

#define	__need_size_t
#include <stddef.h>

__BEGIN_DECLS

/* Remove any previous definitions.  */
#undef	alloca

/* Allocate a block that will be freed when the calling function exits.  */
extern void *alloca (size_t __size) __THROW;

#ifdef	__GNUC__
# define alloca(size)	__builtin_alloca (size)
#endif /* GCC.  */

__END_DECLS

#endif /* alloca.h */

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