GCC Tuning

File this under “things that should be obvious but I just found out about”.  GCC will tell give you optimal flags for your processor.  To wit:

echo "" | gcc -march=native -v -E - 2>&1 | grep cc1

Stick the results into your make file or command-line call to GCC and your executable should be as optimized for your processor as GCC can make it.

You could, of course, always use --march=native  and forget all that but that doesn’t work so well if you’re cross-compiling.

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