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On Saturday 22 December 2007, Graham Murray wrote: |
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> "Mark Shields" <laebshade@×××××.com> writes: |
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> > If I remember correctly, flags like this are not recommended to enable. |
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> > GCC can already pass the appropriate flags, such as MMX and SSE, to |
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> > programs when compiling; the fact that this ebuild has optional use flags |
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> > for this setting is a red flag, in my opinion. I would recommend |
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> > researching possible problems you may have before building any programs |
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> > with the MMX use flag. |
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> |
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> The mmx (and sse, sse2 etc) use flags do not normally have anything to |
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> do with the gcc -mmmx etc flags. Normally in a configure for a package |
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> they will cause a optimised assembler to be included for certain functions |
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> rather than using 'generic' C code for them. In ebuilds the mmx USE |
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> flag normally selects these configure options when building the package, |
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> so (unlike using CFLAGS=-mmmx) are quite safe in most cases. |
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Hmm, does this mean I should remove my mmmx CFLAGS? I must have been running |
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this lot for at least 2.5 years now and cannot say that I have seen any |
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problems with them: |
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CFLAGS="-O2 -march=pentium3 -fomit-frame-pointer -msse -mmmx -pipe" |
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-- |
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Regards, |
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Mick |
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