[Nottingham] Athlon64 gcc compile flags on Gentoo

[Martin]

Martin wrote:
> Folks,
> 
> I'm about to try out Gentoo on a Athlon64 box (yes, that ASUS one now
> with updated BIOS)...
> 
> Any recommendations for a good combination of compiler flags beyond the
> usual "-O3" (or "-Os" even)?

OK, fair comment there Michael about "-O3" possibly causing problems.

I've found a good summary on:
http://gentoo-wiki.com/CFLAGS

Interestingly, http://gentoo-wiki.com/Safe_Cflags#Athlon_64_.28AMD.29
lists:

 Athlon 64 (AMD)

32 bit

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=k8 -O2 -pipe"
CXXFLAGS="${CFLAGS}"

64 bit
cpu family  :15
model  :4
model name  :AMD Athlon(tm) 64 Processor 3200+
stepping  :8

CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=k8 -O2 -pipe"
CXXFLAGS="${CFLAGS}"


Note the lack of "-fomit-frame-pointer" that is more usual. Any reason
why for the Athlon64?


Cheers,
Martin

-- 
----------------
Martin Lomas
martin at ml1.co.uk
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