c-family: -Wleading-whitespace= argument spelling

On Thu, Oct 24, 2024 at 03:33:25PM -0400, Eric Gallager wrote:
> On Thu, Oct 24, 2024 at 4:17 AM Jakub Jelinek <jakub@redhat.com> wrote:
> > I've tried to build stage3 with
> > -Wleading-whitespace=blanks -Wtrailing-whitespace=blank -Wno-error=leading-whitespace=blanks -Wno-error=trailing-whitespace=blank
>
> So wait, it's "blanks" (plural) when it's leading, but "blank"
> (singular) when it's trailing? That inconsistency bothers me...

I've mentioned it already in
https://gcc.gnu.org/pipermail/gcc-patches/2024-October/664664.html
Citing that here:
    Not sure about the kinds for the option, given -Wleading-whitespace=
    uses plural and this option singular and -Wleading-whitespace= spaces
    means literally just ' ' characters, while space in
    -Wtrailing-whitespace= was ' ', '\t', '\v' and '\f'; so category;
    perhaps just use any and blanks?
Other preferences?

Here is a patch to do the blank->blanks and space->any changes.

2024-10-27  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* doc/invoke.texi (Wtrailing-whitespace=): Change
	blank argument to blanks and space argument to any.
gcc/c-family/
	* c.opt (warn_trailing_whitespace_kind): Change blank
	to blanks and space to any.
gcc/testsuite/
	* c-c++-common/cpp/Wtrailing-whitespace-2.c: Use
	-Wtrailing-whitespace=blanks rather than -Wtrailing-whitespace=blank.
	* c-c++-common/cpp/Wtrailing-whitespace-3.c: Use
	-Wtrailing-whitespace=any rather than -Wtrailing-whitespace=space.
	* c-c++-common/cpp/Wtrailing-whitespace-7.c: Use
	-Wtrailing-whitespace=blanks rather than -Wtrailing-whitespace=blank.
	* c-c++-common/cpp/Wtrailing-whitespace-8.c: Use
	-Wtrailing-whitespace=any rather than -Wtrailing-whitespace=space.