bool.h
#ifndef VNBOOL_H_INCLUDED
#define VNBOOL_H_INCLUDED
#include "vn/util/compiler.h"
#include "vn/int.h"
#if !defined(__cplusplus)
#if VN_HAVE_STDBOOL_H
#include <stdbool.h>
#else
#if !defined(__GNUC__)
/* _Bool builtin type is included in GCC. */
/* ISO C Standard: 5.2.5 An object declared as type _Bool is large
* enough to store the values 0 and 1. */
typedef int8_t _Bool;
#endif
/* ISO C Standard: 7.16 Boolean type */
#if defined(__STDC__) && defined(__GNUC__)
/* Avoid warning "ISO C90/89 does not support boolean types" */
#define bool int8_t
#else
#define bool _Bool
#endif
#define true 1
#define false 0
#define __bool_true_false_are_defined 1
#endif
#endif
#endif