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