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* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or
* See the License for the specific language governing permissions
* and limitations under the License.
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
* Copyright 2014 Garrett D'Amore <>
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
#ifndef _ALLOCA_H
#define _ALLOCA_H
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
* Many compilation systems depend upon the use of special functions
* built into the the compilation system to handle variable argument
* lists and stack allocations. The method to obtain this in SunOS
* is to define the feature test macro "__BUILTIN_VA_ARG_INCR" which
* enables the following special built-in functions:
* __builtin_alloca
* __builtin_va_alist
* __builtin_va_arg_incr
* It is intended that the compilation system define this feature test
* macro, not the user of the system.
* The tests on the processor type are to provide a transitional period
* for existing compilation systems, and may be removed in a future
* release.
#if defined(__BUILTIN_VA_ARG_INCR) || \
defined(__sparc) || defined(__i386) || defined(__amd64)
#define alloca(x) __builtin_alloca(x)
extern void *__builtin_alloca(size_t);
extern void *alloca(size_t);
#endif /* defined(__BUILTIN_VA_ARG_INCR) || defined(__sparc) ... */
#ifdef __cplusplus
#endif /* _ALLOCA_H */