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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/endianness.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/endianness.h

     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 */