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David W Noon schrieb: |
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> You need to consider CHOST as well, to ensure you make the most of the |
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> newer CPUs. |
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> |
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> Here is what I use on an E6600 machine: |
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> |
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> CHOST="x86_64-pc-linux-gnu" |
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> CFLAGS="-march=nocona -mmmx -m3dnow -msse -msse2 -msse3 -mfpmath=sse,387 -O2 -pipe" |
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> |
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> Note that -fomit-frame-pointer is not applicable on AMD64/EM64T hardware |
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> platforms; it will be silently ignored by GCC. Most of the additional |
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> processor features I have specified (MMX, SSE/2/3, 3DNow!) are actually |
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> implied by the -march=nocona, but I specify as a mnemonic to myself |
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> that these are [potentially] in use on this box. |
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> |
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> If you simply restored from a Pentium 4 system you will need to take the |
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> steps to change the CHOST. This is documented on the Gentoo web site. |
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Phew, this scares me ;) |
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I use |
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CHOST="i686-pc-linux-gnu" |
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now, and don't want to go 64bit anyway (at least not in the near |
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future), so I think will just edit the CFLAGS for a start and re-emerge |
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system, then world? |
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Or is it preferable to really change that CHOST even when running a |
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32bit system? (I have a E6600 as well as my main workstation ... this |
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would apply there also) |
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Thanks for any tips on this, I am rather defensive when it comes to |
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change these essential settings. |
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|
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Stefan |
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-- |
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