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* Re: [gentoo-user]  Re: Cannot compile texinfo: Illegal instruction -> Wrong -march and -mtune flags?
  @ 2007-08-02 20:31 99%     ` Florian Philipp
  0 siblings, 0 replies; 1+ results
From: Florian Philipp @ 2007-08-02 20:31 UTC (permalink / raw
  To: gentoo-user

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Am Donnerstag 02 August 2007 22:07 schrieb Alexander Skwar:
> · Me, myself & I:
> > Indeed, I think that I just have mixed up -march and -mtune (aka. -mcpu).
>
> Seems like. I now have:
>
> CFLAGS="-O2 -mtune=pentium-m -march=athlon-xp -pipe -fomit-frame-pointer"
>
> and with this CFLAGS, I am able to compile texinfo.
>
> Alexander Skwar
> --

-march=pentium-m activates MMX, SSE and SSE2
-march=athlon-xp activates MMX, 3dNOW!, enhanced 3dNOW! and SSE

You see, they are not compatible and even if some code works I wouldn't bet 
multimedia apps will perform well.

With -mtune the instruction set stays the same. It is just "rearranged".

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2007-08-02 18:15     [gentoo-user] Cannot compile texinfo: Illegal instruction -> Wrong -march and -mtune flags? Alexander Skwar
2007-08-02 19:41     ` [gentoo-user] " Alexander Skwar
2007-08-02 20:07       ` Alexander Skwar
2007-08-02 20:31 99%     ` Florian Philipp

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