On 12/8/21 13:12, Adhemerval Zanella wrote:
> +  int : 8 * (sizeof (time_t) - sizeof (long)) * (__BYTE_ORDER == __BIG_ENDIAN);
> +  long int tv_nsec;
> +  int : 8 * (sizeof (time_t) - sizeof (long)) * (__BYTE_ORDER == __LITTLE_ENDIAN);

Nice idea, and we can simplify things more: we don't need that last line 
as the compiler will insert that padding for us on all glibc platforms 
that need it. Also, the code should use 'long int' consistently. 
Further, there's no reason for struct timespec to mention __time64_t or 
__time_t; it can just use time_t consistently.

Something like the attached, say.