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On 16 May 2006 18:30:31 -0500, Harry Putnam <reader@×××××××.com> wrote: |
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> Taking the opportunity of a major update to adjust CFLAGS in |
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> /etc/make.conf and I found something that looks like it might be a |
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> typo of mine. |
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> |
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> CFLAGS="-Os -march=athlon-xp -pipe" |
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> |
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> Does the `O' (uppercase oh) have an `s' component? |
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> |
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Yes - the -O setting is the level of code optimization that gcc does - |
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-Os is very similar to -O2, but also does code size optimization, |
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which may, under some circumstances, result in slower performance, but |
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will also, in other circumstances, result if faster performance. I |
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typically run my systems at -O2, unless I have a really small L2 cache |
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on the processor, in which case I will *generally* run -Os - or, if I |
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have storage media constraints, then I run -Os for the small amount of |
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storage savings that it gives you - not large enough to worry about in |
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a typical system, but when dealing with embedded systems, sometimes |
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every byte counts. :) |
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|
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-James |
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> gcc man says the `O' is to set levels and I think this may be supposed |
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> to be a 2. |
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> |
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> -- |
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> gentoo-user@g.o mailing list |
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> |
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> |
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|
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-- |
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