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gcc compiler bug (sparc, ppc)



Sergei Organov wrote:

>Ralf Corsepius <ralf.corsepius at rtems.org> writes:
>  
>
>>On Wed, 2007-05-23 at 08:43 -0700, Till Straumann wrote:
>>    
>>
>[...]
>  
>
>>> Also, the fact that the problem
>>>has been there for a while (at least 3.2.3 ... 4.1.1) makes me
>>>believe that it might not have been reported yet.
>>>      
>>>
>>This is what baffles me - such constructs are such kind of common,
>>    
>>
>
>Really? With overlapping list nodes? Common?! Did you miss that the bug
>could be exposed only when two nodes overlap like this:
>
>node1:  |next|prev|
>node2:       |next|prev|
>
>?
>
>  
>
>>my gut feeling is, "we must be missing something".
>>    
>>
>
>I think it's rather unlikely that this bug will show itself in real-life
>code, so chances are high nobody but Till noticed it yet.
>
I was reading the m_freem() code about two days ago.  I suspected
some problems there, but I was not sure if it was gcc compiler related
or related to other part of RTEMS code.
It behaved the same at least 3.2.2 ... 4.1.1.

Kate

>
>-- Sergei.
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>  
>

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