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On Wed, 17 May 2006 03:30:31 +0400, Harry Putnam <reader@×××××××.com> |
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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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> 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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-Os is an optimization for size. |
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From man gcc: |
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-Os Optimize for size. -Os enables all -O2 optimizations that do not |
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typically increase code size. It also performs further |
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optimiza- |
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tions designed to reduce code size. |
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|
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-Os disables the following optimization flags: -falign-functions |
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-falign-jumps -falign-loops -falign-labels -freorder-blocks |
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-fprefetch-loop-arrays |
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|
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If you use multiple -O options, with or without level numbers, |
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the |
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last such option is the one that is effective. |
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-- |
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