Re: [PATCH 7/8] write_file: add format attribute

On Fri, Jul 08, 2016 at 05:12:41AM -0400, Jeff King wrote:

I had also hoped it would help with confusing write_file()
and write_file_buf(), since the former's "..." can make it
match the signature of the latter. But given that the buffer
for write_file_buf() is generally not a string literal, the
compiler won't complain unless -Wformat-nonliteral is on,
and that creates a ton of false positives elsewhere in the
code base.

I poked around at the results of compiling with -Wformat-nonliteral, but
gave up at trying to make it work. There are a number of clever uses of
formats that would be hard to do otherwise. There are also several cases
where a format string is used multiple times and we want to avoid
repeating it. But using #define doesn't work, because we want to be able
to translate it.

I did find a little bit of low-hanging fruit, though.

  [1/2]: walker: let walker_say take arbitrary formats
  [2/2]: avoid using sha1_to_hex output as printf format

These are totally independent of the main series, so they can be a
separate topic, go on top, or just get dropped entirely if it's not
worth the trouble.

-Peff