1#ifndef _BITS_ENDIANNESS_H
2#define _BITS_ENDIANNESS_H 1
3
4#ifndef _BITS_ENDIAN_H
5# error "Never use <bits/endianness.h> directly; include <endian.h> instead."
6#endif
7
8/* i386/x86_64 are little-endian. */
9#define __BYTE_ORDER __LITTLE_ENDIAN
10
11#endif /* bits/endianness.h */
12

source code of include/x86_64-linux-gnu/bits/endianness.h