bug#7305: sort command not working in version 5.5 as it did in 4.7

[Paul Eggert]

On 10/29/10 15:47, Pádraig Brady wrote:
> I think we should as in the unlikely case one
> is debugging with a file starting with +,
> then one can/should protect it with --

Yes, definitely.  More generally, how about if
--debug warns whenever any file name
begins with "+" (unless the file name is
protected with --)?  This is because they changed
POSIX in the 2008 edition to say that
"sort" is allowed to use "+" to delimit
options.  For example, "sort --debug +foo"
should generate a warning, even
if the file "+foo" exists, because "sort +foo"
is not portable to other POSIX-2008 "sort"s.
But "sort --debug -- +foo" should be OK
if "+foo" exists.