[PATCH/RFA] Add -Wformat-zero-length for zero-length format warning

[Jason R Thorpe]

On Sat, May 18, 2002 at 12:11:13PM +0100, Joseph S. Myers wrote:

 > I'm sure we don't want -Wformat=3 - -Wformat=2 should suffice for enabling
 > "extra" checks.

Okay.

 > There are lots of other checks for useless formats (e.g., for using
 > useless combinations of flag characters where one gets ignored).  One day
 > extensible format checking might allow to you specify exactly what formats
 > make sense for your format function.  For now, if you really want to
 > disable this particular check, add -Wno-format-zero-length by analogy with
 > -Wno-format-extra-args.

Er, are you saying that the zero-length warning should still be anabled
for the base -Wformat, or only for -Wformat=2?  I'm willing to change the
patch to do either (though I would prefer that -Wformat=2 enable the zero-
length check, because it means I don't have to add another compiler switch
to various Makefiles, which means I don't have to add another local change
to our current 2.95.3-based compiler :-)

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>