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On Wed, 2005-12-07 at 19:35 +0000, Peter Humphrey wrote: |
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> On Wed, 7 Dec 2005 10:44:01 -0600 (CST) |
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> "Brett Johnson" <brett@××××.com> wrote: |
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> |
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> > Here is a good doc on how to set this up: |
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> > |
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> > http://www.gentoo.org/proj/en/base/amd64/howtos/index.xml?part=1&chap=3 |
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> |
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> A useful pointer - thanks. But it seems to assume that we use Athlon XP |
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> processors (FLAGS="-O2 -march=athlon-xp -msse2 -pipe |
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> -fomit-frame-pointer"). My box has Opterons, so I assume I should |
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> substitute "-march=opteron", no? |
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> |
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> I've found explanations a bit thin on the ground as to what the C arch |
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> flag and the chost definition do. It's generally true that an |
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> explanation is far better than an instruction if you want to avoid |
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> supplementary questions :-) |
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Yes, use -march=opteron (or athlon64, or k8, or nocona, or any of the |
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other currently equivalent march flags in gcc). These do not imply |
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64-bitness, that's determined by the compiler and the -m32/-m64 flags. |
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Daniel |
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