linux-kernel - Re: [PATCH] SPI: improve sysfs compiler complaint handling

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Message-Id: <1160678375.3000.454.camel@laptopd505.fenrus.org>
Date:	Thu, 12 Oct 2006 20:39:34 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	David Brownell <david-b@...bell.net>
Cc:	Jeff Garzik <jeff@...zik.org>, dbrownell@...rs.sourceforge.net,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] SPI: improve sysfs compiler complaint handling

> Does anyone know why the GCC folk have decided to go against decades
> of common practice here???

because it's new semantics. I was involved in this GCC feature (not in
the coding just in the asking for it) and this behavior was specifically
requested: It is called __must_check, you MUST CHECK it. It's not the
normal "unused warning", by putting the attribute on the function you
tell gcc that the result MUST be checked. Just a cast to void isn't
checking it.... so it rightfully warns.

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