Re: fix compile warning for pg_backup_tar.c

I have added a comment explaining the possible compiler warning:

/*
* Some compilers with throw a warning knowing this test can never be
* true because off_t can't exceed the compared maximum.
*/
if (th->fileLen > MAX_TAR_MEMBER_FILELEN)
die_horribly(AH, modulename, "archive member too large for tar format\n");

---------------------------------------------------------------------------

Andrew Dunstan wrote:
>
>
> Peter Eisentraut wrote:
>
> >Andrew Dunstan wrote:
> >
> >
> >>ISTM that what is happening here is that the compiler is smart enough
> >>to know that what is in MAX_TAR_MEMBER_FILELEN can't be exceeded by
> >>any possible value of type off_t.
> >>
> >>
> >
> >Yeah, I think off_t is only 32 bits there. Then using INT64_IS_BUSTED
> >as conditional is really misleading.\
> >
> >
>
> What would you like me to use? Or maybe we should just do this in all
> cases instead of using an ifdef?
>
> cheers
>
> andrew
>
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