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Hi, |
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maxim wexler wrote: |
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> |
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> --- Mark Knecht <markknecht@×××××.com> wrote: |
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> |
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> |
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>>On 9/18/05, maxim wexler <blissfix@×××××.com> wrote: |
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>><SNIP> |
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>> |
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>>>flags : fpu vme de pse tsc msr pae mce |
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>> |
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>>cx8 |
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>> |
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>>>apic sep mtrr pge mca cmov pat pse36 clflush mmx |
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>> |
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>>fxsr |
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>> |
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>>>sse sse2 syscall nx mmxext 3dnowext 3dnow |
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>> |
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>><SNIP> |
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>> |
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>>So Walter's point would be that you could add |
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>> |
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>>mmx mmxext sse sse2 3dnow 3dnowext |
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>> |
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>>to your use flags, either globally in your make.conf |
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> |
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> |
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> what about all those others? |
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> |
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Look at gcc-home page, think there's plenty of info, also this theme is |
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regularly discussed here (ML), search the archives. |
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Shortly said, use "-O2 -march.../-mtune... -pipe -fomit-frame-pointer" |
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is a safe choice. It (-O2) includes many of the other flags by default. |
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> |
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>>file or for |
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>>specific packages in package.use. Adding these flags |
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>>will enable clode |
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>>within the program being emerged specifically |
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>>supporting those |
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>>features. |
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>> |
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>>My point was that without adding these flags to the |
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>>compile options |
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>>(CXFLAGS) in make.conf I'm not clear that adding the |
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> |
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> |
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> well, are they CXFLAGS or USE flags? |
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> |
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They are distinct - CFLAGS (CXXFLAGS) are the raw CPU flags, while |
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through USE= you can activate some of them too, but only those that have |
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such USE flags (mmx,sse,3dnow etc). Corrections here, somebody? |
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> |
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>>flags in the USE |
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>>section of make.conf does anything to generate |
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>>actual sse or mmx code. |
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>> |
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>>I'd like to hear from some folks who really |
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>>understand how gcc works |
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>>about this. It's confused me for quite awhile. |
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>> |
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>>Thanks, |
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>>Mark |
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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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> |
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PS: just to mention i use custom CFLAGS (per category/per package) and |
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didn't have any problems so far, but not too aggressively (bashrc). |
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HTH. Rumen |
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-- |
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