[Bug other/53313] Add warning levels

[david at doublewise dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53313

David Stone <david at doublewise dot net> changed:

           What    |Removed                     |Added
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                 CC|                            |david at doublewise dot net

--- Comment #2 from David Stone <david at doublewise dot net> 2012-08-16 03:49:07 UTC ---
Naming the meta-warning that turns on all warnings '-Weverything' would match
with clang's syntax, so that's probably what we should name it, too.