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 2 weeks 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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[–] Zucca@sopuli.xyz 1 points 3 days ago (1 children)

To see what gcc picks up for your -march=native, run resolve-march-native --keep-mno-flags. Available as app-misc/resolve-march-native.

[–] henfredemars@infosec.pub 5 points 2 weeks ago (1 children)

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.

[–] CarbonBasedNPU@lemm.ee 2 points 2 weeks ago

Thank you.