include/alloca.h

   1 /* Copyright (C) 1992-2021 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.  */
  32 extern 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 */