Date: Mon, 9 Feb 2009 15:34:11 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-current@freebsd.org Cc: usb@freebsd.org, Christoph Mallon <christoph.mallon@gmx.de> Subject: Re: HEADSUP usb2/usb4bsd to become default in GENERIC Message-ID: <200902091534.12506.hselasky@c2i.net> In-Reply-To: <499038DE.3050501@gmx.de> References: <20090206045349.GQ78804@elvis.mu.org> <200902091450.07014.hselasky@c2i.net> <499038DE.3050501@gmx.de>
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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(); --HPS
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