Re: GCC Status Report (2004-04-05)

[Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>]

Mark Mitchell wrote:
> GCC 3.4
> =======
>
> I believe that we are not at the point of diminishing marginal
> returns.  There is still a code-gen problem on PA that Zack and/or I
> may look at, but I think that we have gone about as far as we should
> go for 3.4.0.
>
> Therefore, I plan to roll the prerelease tonight.
>
> If you have an outstanding patch which I have already approved for 
> 3.4.0, please check it in now.  Other than that, the 3.4.0 branch is now 
> fully frozen to any and all commits.
>
> The actual release will follow in a week or so, assuming all goes
> well.
>
> Thanks to Eric and Jakub for working hard on the aliasing issues this
> past week!  And to everyone else who fixed bugs!

I just checked the 3.4 branch wrt POOMA again, and viola, got another 
miscompilation compared to g++ (GCC) 3.4.0 20040331 (prerelease).
src/Particles/tests/bctest3.cpp is miscompiled with -O2 and passes with 
-O on ia32-linux.  It's again some sort of Heisenbug (commenting out 
unrelated code before the failure makes the test pass), as were previous 
ones that just disappeared and as are the ones filed against 3.3.  So I 
suspect there is some weird bug somewhere at least both in 3.3 and 3.4.

No, I don't expect this to be fixed until release as I myself don't have 
time to extensively track this down (not that it helped much in previous 
cases). Oh well.  If only we had a simple way to kill all unused 
sourcecode in a testcase to begin with...

Thanks for all your work on gcc 3.4,

Richard.