Get native CFLAGS for your host device. This will list the flags that are enabled on your hardware that are not enabled on the parent arch. https://alexdelorenzo.dev/notes/cflags

get-cflags.sh

#!/usr/bin/env bash
# See: https://alexdelorenzo.dev/notes/cflags
# Requires `strs` package for Python: https://github.com/alexdelorenzo/strs/
# License: AGPLv3
export detectedArch="$(gcc -march=native -Q --help=target | grep march | str col 1 | str nth 0)"
export arch="${1:-$detectedArch}"


get-diff() {
  diff \
    <(gcc -march=native -mtune=native -Q --help=target) \
    <(gcc -march=$arch -Q --help=target)
}


get-flags() {
  grep "<" | grep "enabled" | str col 1 \
    | while read flag; do 
        printf "%s " "$flag"
      done
   
   printf '\n'
}


get-diff | get-flags

I made a fork that doesn't require the strs package, just uses the widely available awk command. Very useful little script though, thanks for sharing!