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

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#ifndef __MACHINE_ENDIAN_H__
#include <sys/config.h>
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#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
#endif /* __MACHINE_ENDIAN_H__ */