[Bug fortran/69495] unused-label warning does not tell which flag triggered it

[janus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69495

--- Comment #3 from janus at gcc dot gnu.org ---
(In reply to Manuel López-Ibáñez from comment #2)
> I think there must be a lot more cases of this:

Yes, those should be taken care of as well. I'll try to do that.

I guess practically all occurrences of "gfc_warning (0, ..." need to be
transformed, or are there cases where the zero is legitimate?