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The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/gnu/stubs.h

     1	/* This file is automatically generated.
     2	   This file selects the right generated file of `__stub_FUNCTION' macros
     3	   based on the architecture being compiled for.  */
     4	
     5	
     6	#if !defined __x86_64__
     7	# include <gnu/stubs-32.h>
     8	#endif
     9	#if defined __x86_64__ && defined __LP64__
    10	# include <gnu/stubs-64.h>
    11	#endif
    12	#if defined __x86_64__ && defined __ILP32__
    13	# include <gnu/stubs-x32.h>
    14	#endif