Fwd: Problem report: Struct aliasing problem causes Thread_Ready_Chain corruption in 4.6.99.3

[Joel Sherrill]

Ralf Corsepius wrote:
> On Tue, 2006-11-21 at 16:38 +0100, Thomas Doerfler wrote:
>
>   
>> Therefore your patch in malloc.c is IMHO identical to the previous
>> explicit cast.
>>     
> Please prove Joel's patch to be broken.
>   
I did that because that type of code fixed previous punning problems.  It
seems to tell gcc that we knew what we were doing.  If you look at a lot
of the changes between 4.6 and 4.7 you will see more than a few changes
following this pattern.

I am more concerned about the _Chain_Head and _Chain_Tail routines.
I don't see how to clean them up without the union.  And I believe (but
can't prove) that they are the root of gcc's confusion. 

--joel
> Ralf
>
>
>