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sortix--sortix/libc/include/alloca.h

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
alloca.h
Stack-based memory allocation.
*******************************************************************************/
#ifndef INCLUDE_ALLOCA_H
#define INCLUDE_ALLOCA_H
#include <sys/cdefs.h>
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#include <sys/__/types.h>
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#ifdef __cplusplus
extern "C" {
#endif
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#ifndef __size_t_defined
#define __size_t_defined
#define __need_size_t
#include <stddef.h>
#endif
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/* If somehow another declaration of alloca happened. This shouldn't happen, but
glibc does this and we might as well do it also. */
#undef alloca
/* Declare a function prototype despite that there really is no alloca function
in Sortix. The compiler will normally be run with -fbuiltin and simply use
the compiler builtin as intended. */
void* alloca(size_t);
/* In case the compilation is run with -fno-builtin, we'll call the builtin
function directly, since there is no alloca function in the first place. You
can simply undef this if you want the real prototype, which will give a link
error if -fno-builtin is passed. */
#define alloca(size) __builtin_alloca(size)
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#ifdef __cplusplus
} /* extern "C" */
#endif
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#endif