[vorbis-dev] alloca() problem with CodeWarrior

[Firelight Technologies]

I didn't mention compiler bug once.  I specifically mentioned support of
C library functions.  Compiler bugs are different and should be fixed by
the compiler manufacturer.

 
Brett Paterson
CEO / Lead Programmer.
Firelight Technologies Pty Ltd.
FMOD SoundSystem
http://www.fmod.org
 

> -----Original Message-----
> From: owner-vorbis-dev at xiph.org [mailto:owner-vorbis-dev at xiph.org] On
> Behalf Of Segher Boessenkool
> Sent: Friday, 15 March 2002 12:50 PM
> To: vorbis-dev at xiph.org
> Subject: Re: [vorbis-dev] alloca() problem with CodeWarrior
> 
> > I agree with brian, if something didn't work on one pc out of a
> > thousand, I would try and work around it,
> 
> Ah, like this:
> 
> -- the user might want to use gcc-2.95 on x86 with an OS distro that
>    thinks all the world is an intel pentium pro/2/iii
>    ==>  no fp comparisons, again.
> 
> -- the user might want to use gcc-2.91.66 on x86
>    ==>  we can't reliably use fp comparisons.
> 
> -- the user might want to use gcc-3.0.2 on ppc
>    ==>  we can't use floating point comparisons to 0.f
> 
> -- the user might want to use MSVC older than, erm, 5 I think
>    ==>  we can't reliably use floats in static initializers.
> 
> -- the user might want to use some older CW version
>    ==>  we must make sure all our structs and stack parameter frames
>         are 16-byte aligned, in case the user has enabled some goofy
>         compiler options and expects the resulting lib to play nice
>         with other libs.
> 
> Just some of the compiler bugs I noticed while hacking Vorbis (well,
#2
> wasn't discovered by me, and #5 was a well-known bug already.  And
there
> already was a compiler fix for it).
> 
> All of these happen more than 1 in 1000 users, and none of these can
> be worked around without huge sacrifices in either code speed or
> legibility or maintainability or whatever.
> 
> 
> Yes, we don't use C99 features, because not every compiler has it.
> But we won't go as far as writing everything K&R compatible.
> Whether or not to use alloca() is somewhere inbetween.
> 
> 
> Segher
> 
> 
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