[Bug fortran/43899] Wrong unused-variable warning with NAMELISTs

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43899

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |---

--- Comment #15 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(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.)