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/* Memory allocation on the stack.

   Copyright (C) 1995, 1999, 2001-2004, 2006-2010 Free Software Foundation,

   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, 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
   General Public License for more details.

   You should have received a copy of the GNU General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

/* Avoid using the symbol _ALLOCA_H here, as Bison assumes _ALLOCA_H
   means there is a real alloca function.  */
#ifndef _GL_ALLOCA_H
#define _GL_ALLOCA_H

/* alloca (N) returns a pointer to N bytes of memory
   allocated on the stack, which will last until the function returns.
   Use of alloca should be avoided:
     - inside arguments of function calls - undefined behaviour,
     - in inline functions - the allocation may actually last until the
       calling function returns,
     - for huge N (say, N >= 65536) - you never know how large (or small)
       the stack is, and when the stack cannot fulfill the memory allocation
       request, the program just crashes.

#ifndef alloca
# ifdef __GNUC__
#  define alloca __builtin_alloca
# elif defined _AIX
#  define alloca __alloca
# elif defined _MSC_VER
#  include <malloc.h>
#  define alloca _alloca
# elif defined __DECC && defined __VMS
#  define alloca __ALLOCA
# else
#  include <stddef.h>
#  ifdef  __cplusplus
extern "C"
#  endif
void *alloca (size_t);
# endif

#endif /* _GL_ALLOCA_H */

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