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