--- Comment #4 from Martin Liška <marxin at gcc dot> ---
Ok, so I've briefly investigated source code and providing such information is
definitely not a simple task :/

I would recommend to fix PR39851 and then one will just compare output of
following 2 invocations:

gcc --help=target  -Q
gcc --help=target -march=native -Q 

Will it work for you?

Note that fully understand which ISA extensions are enable when is also quite

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