> I have quite new CPU (i7-4770K) and old version of Ubuntu (12.04 LTS 64-bit).
>
> It was not possible to compile 3.7RC7 with default settings, the compilation
> stopped with unknown assembly instructions when old gcc didn't recognize Haswell
> architecture's native instructions.
>
> I query-replaced march=native with march=corei7 from configure file and after
> that all went normally.
>
> I can't say if the speed suffered, but now it shows all 8 (virtual) cores in
> 100% load when rendering and it is much faster than my older i5-750 rig.
Thanks for sharing.
Just for the sake of completeness, your gcc version might also be of
interest to readers.
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