I rely on the current behaviour - I set my 'ideal' CFLAGS in mk.conf and all packaged build with them (I build on a faster box than I run so autodetected CFLAGS would be a lose for me). I have no objections to a mplayer-compiletime-cpudetection or similar option... This raises the issue of whether autodetection is ever ok by default. With 10 seconds of thought, it seems like we should have some sort of option perhaps 'cpudetection' that is by default unset but for various packages will tune the code for the current CPU. By default the package should make code that will run on all processors within the processor family that are supported by the target OS.
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