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 */ 41