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The C and C++ Include Header Files

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

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

     1	/* This file specifies the native word size of the machine, which indicates
     2	   the ELF file class used for executables and shared objects on this
     3	   machine.  */
     4	
     5	#ifndef _LINK_H
     6	# error "Never use <bits/elfclass.h> directly; include <link.h> instead."
     7	#endif
     8	
     9	#include <bits/wordsize.h>
    10	
    11	#define __ELF_NATIVE_CLASS __WORDSIZE
    12	
    13	/* The entries in the .hash table always have a size of 32 bits.  */
    14	typedef uint32_t Elf_Symndx;

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