--- layout: fc_discuss_archives title: Message 6 from Frama-C-discuss on May 2013 ---
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[Frama-c-discuss] New Frama-C version: Fluorine



Hi,

it's interesting that you mention you can prove it with z3. In my
experience with the WP plugin, I cant prove anything with Z3 (4.3.2) save
one or other random PO.

I usually rely on CVC3 (2.4.1)


2013/5/6 Lo?c Correnson <loic.correnson at cea.fr>

> Thanks for the report.
>
> It's seems to be related to a problem in alt-ergo with the record theory :
> the addition of the helper assertions trigger more fact on record
> comparisons.
> Without these helpers, alt-ergo give up very quickly (less than 1s), which
> can be a sign of incompleteness.
> Goals are proven with Z3, though.
>
> Regarding cvc3, it is indeed a why3 issue, if any.
> L.
>
>
> Le 4 mai 2013 ? 19:07, Cristiano Sousa a ?crit :
>
> Hi,
>
> I'm having a odd problem with proving a simple contract with the WP
> plugin. I'm forced to insert the assertions HELPER and HELPER2 in order to
> discharge all POs, when in the Oxygen release I didn't need this kind of
> assertions. Without HELPER, BOUND cannot be proved and without HELPER2 the
> post condition cannot be proved. Note: the rest of the assertions were
> inserted to help me pinpoint the problem.
>
> http://pastebin.com/p5AdPN2n
>
> Also, in the previous release of frama-c there was a problem with cvc3
> processes not being killed. This problem now happens more ofter but i'm
> guessing this is a problem related to why and not frama-c.
>
> Thanks!
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-- 
Cumprimentos,
Cristiano Sousa
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