Date: Mon, 09 Feb 2009 20:17:54 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Hans Petter Selasky <hselasky@c2i.net> Cc: usb@freebsd.org, Christoph Mallon <christoph.mallon@gmx.de>, freebsd-current@freebsd.org, Alfred Perlstein <alfred@freebsd.org> Subject: Re: HEADSUP usb2/usb4bsd to become default in GENERIC Message-ID: <87ocxbpj8t.fsf@kobe.laptop> In-Reply-To: <200902091534.12506.hselasky@c2i.net> (Hans Petter Selasky's message of "Mon, 9 Feb 2009 15:34:11 %2B0100") References: <20090206045349.GQ78804@elvis.mu.org> <200902091450.07014.hselasky@c2i.net> <499038DE.3050501@gmx.de> <200902091534.12506.hselasky@c2i.net>
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On Mon, 9 Feb 2009 15:34:11 +0100, Hans Petter Selasky <hselasky@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, ...);
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