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The C and C++ Include Header Files

/usr/include/asm-generic/swab.h


$ cat -n /usr/include/asm-generic/swab.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _ASM_GENERIC_SWAB_H
     3	#define _ASM_GENERIC_SWAB_H
     4	
     5	#include <asm/bitsperlong.h>
     6	
     7	/*
     8	 * 32 bit architectures typically (but not always) want to
     9	 * set __SWAB_64_THRU_32__. In user space, this is only
    10	 * valid if the compiler supports 64 bit data types.
    11	 */
    12	
    13	#if __BITS_PER_LONG == 32
    14	#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
    15	#define __SWAB_64_THRU_32__
    16	#endif
    17	#endif
    18	
    19	#endif /* _ASM_GENERIC_SWAB_H */