sysdeps/wordsize-64/bits/elfclass.h - chromiumos/third_party/glibc - Git at Google

 /* This file specifies the native word size of the machine, which indicates
    the ELF file class used for executables and shared objects on this
    machine.  */

 #define __ELF_NATIVE_CLASS 64
	/* This file specifies the native word size of the machine, which indicates
	the ELF file class used for executables and shared objects on this
	machine. */

	#define __ELF_NATIVE_CLASS 64