[mythtv-users] configure question on MMX enable

Isaac Richards ijr at case.edu
Mon Sep 18 18:53:47 UTC 2006


On Monday 18 September 2006 2:46 pm, Michael T. Dean wrote:
> On 09/18/06 14:21, list at onnow.net wrote:
> >Quick question..
> >
> >When compiling myth, with the ./configure alone does MMX get enabled
> >by default or do you have to specify that in the command?  I just used
> >confgure with no options and want to ensure I am getting the best
> >performance ( lowly 1Ghz celeron frontend machine )
>
> Only if you specify "--enable-proc-opt".  (With a properly configured
> build system.  If you've got a broken toolchain or your system itself is
> broken or you're doing a cross-compile and haven't set everything up
> properly, it's possible for MMX not to be automatically enabled even
> with "--enable-proc-opt".)

When running configure with no options, MMX will be enabled when detected on 
the machine, not with --enable-proc-opt.  The only thing --enable-proc-opt 
does is add a -march=<> flag appropriate for the hardware.

Isaac


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