Show GCC-generated optimization commands when using the "-march=native" or "-mtune=native" switches for compilation.

cc -march=native -E -v - </dev/null 2>&1 | grep cc1
You can tell GCC to automatically select optimization commands and produce optimized code for the local machine (the one compiling the code), but you can't normally see what switches have been selected and used unless you append a "-v" and pause compilation.
Sample Output
This is the output on my AMD Athlon64 X2:

/usr/lib/gcc/i486-linux-gnu/4.3.3/cc1 -E -quiet -v - -D_FORTIFY_SOURCE=2 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param l1-cache-line-size=64 -mtune=k8

5
By: manny79
2009-08-21 09:47:37

What Others Think

Nice tip! with slightly cleaned up output: gcc -march=native -E -v - </dev/null 2>&1 | sed -n 's/.* -v - //p' See also the gcccpuopt script: http://www.pixelbeat.org/scripts/gcccpuopt
pixelbeat · 665 weeks and 6 days ago
Thank you for the cleanup and also good info for that script, really nice!
manny79 · 665 weeks and 6 days ago
Thanks pixelbeat these two didin't work but gcccpuopt did (albeit for 32 bit mode only), it still worked.
unixmonkey20496 · 580 weeks ago
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seofox · 16 weeks and 1 day ago
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seofox · 16 weeks and 1 day ago
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seofox · 15 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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