[vorbis-dev] Serious GCC/EGCS 2.91 bug found (bites rc2)

[Scott Wheeler]

Wow.  Huge difference.  I tried Ogg earlier this week and was quite 
disappointed.  I was using said RPMs.  I couldn't figure out why lots of 
people were using Ogg, it was slow and didn't sound great.  ;-) Building from 
source fixed that.  Good work guys.  I'm glad this was caught before 1.0.  

-Scott Wheeler

On Thursday 16 August 2001 02:14 am, you wrote:
> Hi folks,
>
> The folks on RedHat who have been complaining of poor-quality encodes
> prompted us to track down the trouble, and it's a compiler bug.  We
> have the asm .s files to prove it :-)
>
> The summary: EGCS (gcc) versions through March 1999, including up to
> at least gcc/egcs 2.91.66 have a serious floating point optimization
> bug that hits Vorbis.  This is a fairly old gcc version, but RedHat
> shipped with it until at least RedHat 6.2.  The broken compile will
> produce Ogg files, but the audio quality will have from obvious to
> severe artifacts.
>
> Also, because we wanted our RPMs to be compatable with redhat 6 and 7,
> we built the RPMs using RedHat 6.2.  That means our RPMs are also
> broken.  We'll have an updated, correct build on the vorbis.com site
> ASAP.
>
> No other builds on the vorbis.com site are affected.  Building from
> source is only affected if the compiler used is egcs 2.91 (or older).
> gcc --version will report the compiler version.
>
> Amusingly enough, this EGCS bug was fixed approximately two weeks
> after it shipped, but the broken version continued to be shipped for
> over a year.
>
> Monty
>
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