[Bug c/18050] -Wsequence-point reports false positives

[joseph at codesourcery dot com]

------- Comment #7 from joseph at codesourcery dot com  2006-03-22 12:26 -------
Subject: Re:  -Wsequence-point reports false positives

On Wed, 22 Mar 2006, rguenth at gcc dot gnu dot org wrote:

>   i = ++i;

Modified twice between sequence points, so undefined behavior.

> I think the point is we should not warn for pre-increment, only post-increment.
> Or can someone come up with a testcase that has undefined evaluation order just
> by using pre-increment?  One with two pre-increments:

It's undefined behavior, not undefined evaluation order.  Pre-increment 
returns the new value, but that doesn't mean the new value is stored until 
the following sequence point.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18050