Re: what libc+compiler is in use for development?

Horst von Brand (vonbrand@sleipnir.valparaiso.cl)
Sun, 18 Jul 1999 20:38:53 -0400

Artur Skawina <skawina@geocities.com> said:
> Horst von Brand wrote:
> > be a kernel error (the current -fno-strict-aliasing flag is there to work
> > around illegal code in the kernel (very pervasive and hard to find/fix,
> > unfortunately), not a gcc bug; BTW this inhibits useful optimizations).

> i keep hearing this (ie how bad -fno-strict-aliasing is). instead of a
> comment here's an asm diff (34k) between a kernel compiled (1) with that
> option, and (2) w/o -fno-strict-aliasing. judge for yourself...
>
> http://www.geocities.com/SiliconValley/Heights/6494/sw/difffnsa.txt.gz
>
> [kernel 2.3.5+lots of patches, gcc2.95-19990716, CFLAGS as in 2.3.11,
> configured for 686, +/- std config (ide+scsi+most of networking)]
>
> (it doesn't show anything wrt correctness; just what gcc2.95's
> "strict aliasing" means for code generation)

The "correctness" bothers me a bit: A kernel without -fno-strict-aliasing
doesn't boot here. Might be a blessing ;-)

Could you give a summary of your findings?

-- 
Horst von Brand                             vonbrand@sleipnir.valparaiso.cl
Casilla 9G, Viņa del Mar, Chile                               +56 32 672616




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