[Bug driver/81519] Enhancement: Add --help=target-distcc or similar to dump clean, optimal CFLAGS without using -march=native

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81519

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
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
complex.