distinguishing gcc compilation valgrind false positives

[Zdenek Sojka]

Hello Paul,

(sorry for re-post, I didn't include the ML in the original reply)

---------- Původní e-mail ----------
Od: Paul Floyd via Gcc <gcc@gcc.gnu.org>
Komu: gcc@gcc.gnu.org
Datum: 24. 11. 2021 20:16:33
Předmět: Re: distinguishing gcc compilation valgrind false positives 
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On 24/11/2021 20:05, Zdenek Sojka via Gcc wrote: 
> Hello, 
> 
> from time to time, I come upon a testcase that failed during the automated

> runs, but passes during reduction; there are valgrind warnings present, 
> however. How do I distinguish what warnings are valid and which are false 
> positives? Is there any way gcc could prevent generating the false 
> positives? 


What makes you think that any are false positives? 

Memcheck generally has a low false positive rate (though I am little 
biased). 

You need to read the source and decide based on that. 


A+ 

Paul 
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the main reason why it looks like a false positive is that I've had these 
valgrind warnings ... since probably ever, but it was never causing issues.




I cannot tell from the sources if there is anything wrong, so I am better 
asking here.




Thanks!
Zdenek

 
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