Re: [PATCH] diff: fix behaviour of the "-s" option

> Sergey Organov <sorganov@gmail.com> writes:
>
>>>  * Whenever we set DIFF_FORMAT_FOO becasuse we saw the "--foo"
>>> option (e.g. DIFF_FORMAT_RAW is set when the "--raw" option is
>>> given), we make sure we drop DIFF_FORMAT_NO_OUTPUT. We forgot to do
>>> so in some of the options and caused (2) above.
>>> * When processing "-s" option, we should not just set
>>> DIFF_FORMAT_NO_OUTPUT bit, but clear other DIFF_FORMAT_* bits. We
>>> didn't do so and retained format bits set by options previously
>>> seen, causing (1) above.
>> Sounds good to me. Doesn't this makes DIFF_FORMAT_NO_OUTPUT obsolete
>> as well, I wonder, as absence of any output bits effectively means
>> "no output"?
>
> Not quite. The latter is not "set 0 to output_format word", but "set 0
> to output_format word and then flip only NO_OUTPUT bit on". I've
> written a bit more on it in a follow-up message to the patch.