this post was submitted on 23 Jan 2025
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Gentoo Linux

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Why doesn't Gentoo work with -march=native in Alder-Lake CPUs when -march=alderlake does work (lemm.ee)
submitted 15 hours ago by CarbonBasedNPU@lemm.ee to c/gentoo@reddthat.com
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it appears to be a known issue because when I was searching for the cache size being different it was the first thing that popped up but I'm trying to understand why they aren't equivalent to emerge.

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[–] henfredemars@infosec.pub 5 points 13 hours ago

This isn't the only such case. Raspberry Pi for example for years had incorrect flags if you asked for native. It's not a feature that works super consistently compared to manual specification of the CPU model and features.

As to concretely why the code doesn't work, I am not certain.