Re: -march=i486

[Jeremy Huntwork]

Alexander E. Patrakov wrote:
The GCC manual says:
       -march=cpu-type
           Generate instructions for the machine type cpu-type.  The 
choices
           for cpu-type are the same as for -mtune.  Moreover, specifying
           -march=cpu-type implies -mtune=cpu-type.

       -mtune=cpu-type
           Tune to cpu-type everything applicable about the generated code,
           except for the ABI and the set of available instructions.  The
           choices for cpu-type are: <snip>

So, shouldn't we use -mtune instead of -march? Or even: -march=i486 
-mtune=pentium3


Erm, perhaps we're reading the above differently. On x86 -march implies 
-mtune so a combination of -march and -mtune isn't necessary. I'm not 
quite clear on what else -march gives you that -mtune doesn't, but 
everything -mtune does, -march does. Also, we definitely don't want to 
build specifically for pentium3. I've used the LiveCD on several pentium 
IIs and it works great.

--
JH
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