ap/libc/glibc/glibc-2.23/sysdeps/x86/bits/endian.h

/* i386/x86_64 are little-endian.  */

#ifndef _ENDIAN_H
# error "Never use <bits/endian.h> directly; include <endian.h> instead."
#endif

#define __BYTE_ORDER __LITTLE_ENDIAN