PATCH (head): -Wunused-static-variable

[Kaveh R. Ghazi]

 > In reference to the message thread starting at
 > http://gcc.gnu.org/ml/gcc/2003-04/msg01494.html
 > 
 > how about the following patch. This is against the head, but I can
 > easily redo this on the 3.3 branch if that is desired and someone
 > can take care of the merging back to the head.
 > 
 > 2003-05-01  Kean Johnston  <jkj@sco.com>
 > 
 >     * c-opts.c (COMMAND_LINE_OPTIONS): Add -Wunused-static-variable
 >     for finer grained warning control.
 >     * doc/invoke.texi: Document it.
 >     * flags.h: Declare warn_unused_static_variable.
 >     * toplev.c (W_options): Add it.
 >     (check_global_declarations): Use it.

I'd prefer this warning was controlled by -W as suggested elsewhere.

We already control warning about unused parameter variables this way,
so there is precedent for this.  E.g. try compiling this snippet with
"-Wall" and again with "-W -Wall".

void foo(int a)
{
}

You'll only get the warning about unused `a' with -W added.

We should do the same with this controversial "unused" warning.

		--Kaveh
--
Kaveh R. Ghazi			ghazi@caip.rutgers.edu