Re: [PATCH] manywarnings: remove duplicate -Wmultichar entry

[Jim Meyering]

Paul Eggert wrote:
> I noticed that Emacs's configure script was checking for
> -Wmultichar twice and tracked it down to a gnulib inefficiency,
> fixed as follows.
...
> diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
...
> @@ -143,7 +143,6 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
>    for gl_manywarn_item in \
>      -Wattributes \
>      -Wcoverage-mismatch \
> -    -Wmultichar \
>      -Wunused-macros \
>      ; do
>      gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"

Thanks.  That reminds me that I still have to finish preparing
and post the code to automatically extract "all" warnings from
whatever version of gcc you happen to be using.  The trouble
is that there are many, many warnings that must be filtered out.
Some are relevant only to Fortran, others only to C++, and some
are simply not useful to us, so I ended up with a big
warning-name-to-"type" map, with code to filtering the list
of all warnings through that.