assign numbers to warnings; treat selected warnings as errors

[Gerald Pfeifer]

On Fri, 20 Apr 2007, Manuel López-Ibáñez wrote:
> Not only that, but you can do -Werror -Wno-error=foo, to get errors
> for everything except -Wfoo. Also, you can do
> -fdiagnostics-show-options to find out which -Wfoo option generates
> each warning message. It is unfortunate that this is missing from
> gcc-4.2/changes.html.

Could I talk you (or someone else who has better knowledge about this
than me ;-) to add this to gcc-4.2/changes.html?

Anything else we are missing there?

Gerald