glibc (2.38)

(root)/
include/
bits/
wordsize.h
       1  /* Determine the wordsize from the preprocessor defines.  */
       2  
       3  #if defined __x86_64__ && !defined __ILP32__
       4  # define __WORDSIZE	64
       5  #else
       6  # define __WORDSIZE	32
       7  #define __WORDSIZE32_SIZE_ULONG		0
       8  #define __WORDSIZE32_PTRDIFF_LONG	0
       9  #endif
      10  
      11  #ifdef __x86_64__
      12  # define __WORDSIZE_TIME64_COMPAT32	1
      13  /* Both x86-64 and x32 use the 64-bit system call interface.  */
      14  # define __SYSCALL_WORDSIZE		64
      15  #else
      16  # define __WORDSIZE_TIME64_COMPAT32	0
      17  #endif