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To: Horst von Brand <brand@jupiter.cs.uni-dortmund.de>
Cc: Art Haas <ahaas@airmail.net>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Is -fno-strict-aliasing still needed?
X-Yow: I've got a COUSIN who works in the GARMENT DISTRICT...
From: Andreas Schwab <schwab@suse.de>
Date: Tue, 11 Feb 2003 10:12:31 +0100
In-Reply-To: <200302110714.h1B7EA3A006209@eeyore.valparaiso.cl> (Horst von
 Brand's message of "Tue, 11 Feb 2003 08:14:09 +0100")
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Horst von Brand <brand@jupiter.cs.uni-dortmund.de> writes:

|> Art Haas <ahaas@airmail.net> said:
|> > I ask because I've just built a kernel without using that flag -
|> > linus-2.5 BK from this morning, probably missing the 2.5.60 release by
|> > a few hours.
|> 
|> The problem with strict aliasing is that it allows the compiler to assume
|> that in:
|> 
|>      void somefunc(int *foo, int *bar)
|> 
|> foo and bar will _*never*_ point to the same memory area

This is wrong.  Only if they are declared restrict.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 N?rnberg
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