[sane-devel] C undefined operations in sane-backends-1.0.7-beta1

[Tim Waugh]

On Wed, Jan 23, 2002 at 09:43:35PM +0100, Henning Meier-Geinitz wrote:

> This is with gcc-3.x? I don't get them with gcc 2.95.4.

Yes.

> > They
> > are for things like:
> > 
> > 	bit = ++bit % 8;
> > 
> > which are indeed undefined.
> 
> Because it's not clear if bit should be incremented and then the right
> side assigned to it or vice versa? Or what's the excat problem?

Yes, that's right.  There is only one sequence point in 'bit = ++bit %
8;', at the end, and so the operations can happen in any order.  There
are two assignments to 'bit': the '=' operation and the '++'
operation.

Tim.
*/
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