Re: HEADSUP usb2/usb4bsd to become default in GENERIC

On Mon, 9 Feb 2009 15:34:11 +0100, Hans Petter Selasky <hselasky_at_c2i.net> wrote:
> On Monday 09 February 2009, Christoph Mallon wrote:
>> Hans Petter Selasky schrieb:
>> > On Monday 09 February 2009, Christoph Mallon wrote:
>> >> Christoph Mallon schrieb:
>> >>> are named "err" or "error". This should be investigated, so here's the
>> >>> complete list:
>> >>
>> >> Sorry, my MUA seems to have damaged the list. You can get the list here:
>> >> http://tron.homeunix.org/usb2.unread.log
>> >
>> > I think some of these errors depend if you have USB debugging compiled or
>> > not. At least GCC does not warn?
>>
>> No, it does not depend on USB debugging.
>> GCC has no warning at all for variables which are only assigned to.
>> It only can warn about variables, which are only initialised.
>>
>> {
>>    int x = 23; // GCC warns here ...
>>    int y;      // ... but not here - cparser does
>>    y = 42;
>>    y++;
>> }
>>
>> cparser has an analysis, which can warn about "y", too.
>>
>> I manually verified all 40 warnings and I cannot find any users (i.e.
>> readers) for these variables.
>
> What is the correct way to discard the return argument of a function?
> That's basically what most of the warnings are about.
>
> 1) (void)my_fn() cast
> 2) if (my_fn()) { }
> 3) err = my_fn();
> 4) my_fn();

If you *really* don't care about the returned error code:

        (void)function(arg1, arg2, ...);