esp-open-rtos/libc/xtensa-lx106-elf/include/machine/_endian.h

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#ifndef __MACHINE_ENDIAN_H__
#error "must be included via <machine/endian.h>"
#endif /* !__MACHINE_ENDIAN_H__ */
#include <sys/config.h>
#ifdef __PPC__
/* Get rid of GCC builtin defines on PowerPC */
#ifdef _BIG_ENDIAN
#undef _BIG_ENDIAN
#endif
#ifdef _LITTLE_ENDIAN
#undef _LITTLE_ENDIAN
#endif
#endif /* __PPC__ */
#ifndef _LITTLE_ENDIAN
#define _LITTLE_ENDIAN 1234
#endif
#ifndef _BIG_ENDIAN
#define _BIG_ENDIAN 4321
#endif
#ifndef _PDP_ENDIAN
#define _PDP_ENDIAN 3412
#endif
#ifndef _BYTE_ORDER
#if defined(__IEEE_LITTLE_ENDIAN) || defined(__IEEE_BYTES_LITTLE_ENDIAN)
#define _BYTE_ORDER _LITTLE_ENDIAN
#else
#define _BYTE_ORDER _BIG_ENDIAN
#endif
#endif