Most recent distributions should have a 4.x compiler and support the -march=native CFLAG?
e.g. ffmpeg compiles with -march=x86_64 -mtune=generic O3
Others with -march=x86_64 -mtune=generic O2
e.g. ffmpeg compiles with -march=x86_64 -mtune=generic O3
Others with -march=x86_64 -mtune=generic O2
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