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[Frama-c-discuss] WP plugin report incorrect


The option -wp-invariants is an experimental feature of WP trying to 
prove ACSL "invariant" clause holding inside a loop body as "loop 
invariant" clause.
It seems that there is something wrong with that option.
Since you have no such "invariant" clause, don't use it.


Le 05/10/2015 18:31, Christoph Rauch a écrit :
> Hi David,
>> On 05 Oct 2015, at 18:02, David MENTRE <dmentre at> wrote:
>> Le 05/10/2015 17:56, Christoph Rauch a écrit :
>>> If I completely remove the loop and thus the invariant, it doesn’t verify. How can it possibly prove the loop invariant?
>> Which prover are you using? I tried with Alt-Ergo and CVC3 and the loop invariant in not proved, for both your first code and the code not calling swap().
> Using `-wp-invariants’, which seems to be the cause for the troubles, every prover I tried yields positive (i.e. wrong) results: Alt-Ergo, CVC4, and Z3.
> Best,
> Christoph
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