[mythtv-users] configure question on MMX enable

Michael T. Dean mtdean at thirdcontact.com
Mon Sep 18 20:51:18 UTC 2006


On 09/18/06 14:53, Isaac Richards wrote:

>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.
>

Oops.  Right.  <mental-note>either read the rest of the relevant section 
of configure or run a test before posting</mental-note>

Mike


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