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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/43899] Wrong unused-variable warning with NAMELISTs
Date: Thu, 20 Jun 2013 14:33:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43899

--- Comment #16 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
(In reply to Tobias Burnus from comment #15)
> (In reply to Jerry DeLisle from comment #12)
> > Remaining [...] is to warn on an unused namelist.  I think this will involve
> > marking namelists as used when resolving or translating I/O statements and
> > then at some point, scan for any namelists not marked.
>
> I think the later scanning can be done when generating the DWARF debug 
> symbols (cf. PR37132) in trans-decl.c. While not very important, I find 
> such a warning useful. (One needs to be careful about those declared 
> in a module or accessed via host association. Fortunately, namelists 
> may not be declared in a BLOCK.)

If there is a real need for a warning for unused namelist or namelist items,
then a new PR should be open and this one closed. IMO it is just a waste of
time: unused stuff having a strong tendency to produce false positive.