linux-kernel - Re: [PATCH 16/16] fix handling of integer constant expressions

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Message-ID: <20070627115245.GP7590@daikokuya.co.uk>
Date:	Wed, 27 Jun 2007 20:52:45 +0900
From:	Neil Booth <neil@...kokuya.co.uk>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Josh Triplett <josh@...edesktop.org>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org
Subject: Re: [PATCH 16/16] fix handling of integer constant expressions

Al Viro wrote:-

> 
> sparse simply doesn't check that.  We don't have anything resembling
> support of VLA.  Note that check for integer constant expression
> has nothing to do with that;
> 
> 	int x[(int)(0.6 + 0.6)];
> 
> is valid (if stupid).

It isn't valid; it fails the test twice.  Both 0.6 are not "immediate
operands of casts".  Their sum is, but that's irrelevant.
Therefore the dimension is not an ICE and a diagnostic is required.

Neil.
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